1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
|
// ==++==
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// ==--==
/*============================================================
**
** Class: Dictionary
**
** <OWNER>Microsoft</OWNER>
**
** Purpose: Generic hash table implementation
**
** #DictionaryVersusHashtableThreadSafety
** Hashtable has multiple reader/single writer (MR/SW) thread safety built into
** certain methods and properties, whereas Dictionary doesn't. If you're
** converting framework code that formerly used Hashtable to Dictionary, it's
** important to consider whether callers may have taken a dependence on MR/SW
** thread safety. If a reader writer lock is available, then that may be used
** with a Dictionary to get the same thread safety guarantee.
**
** Reader writer locks don't exist in silverlight, so we do the following as a
** result of removing non-generic collections from silverlight:
** 1. If the Hashtable was fully synchronized, then we replace it with a
** Dictionary with full locks around reads/writes (same thread safety
** guarantee).
** 2. Otherwise, the Hashtable has the default MR/SW thread safety behavior,
** so we do one of the following on a case-by-case basis:
** a. If the ---- can be addressed by rearranging the code and using a temp
** variable (for example, it's only populated immediately after created)
** then we address the ---- this way and use Dictionary.
** b. If there's concern about degrading performance with the increased
** locking, we ifdef with FEATURE_NONGENERIC_COLLECTIONS so we can at
** least use Hashtable in the desktop build, but Dictionary with full
** locks in silverlight builds. Note that this is heavier locking than
** MR/SW, but this is the only option without rewriting (or adding back)
** the reader writer lock.
** c. If there's no performance concern (e.g. debug-only code) we
** consistently replace Hashtable with Dictionary plus full locks to
** reduce complexity.
** d. Most of serialization is dead code in silverlight. Instead of updating
** those Hashtable occurences in serialization, we carved out references
** to serialization such that this code doesn't need to build in
** silverlight.
===========================================================*/
namespace System.Collections.Generic {
using System;
using System.Collections;
using System.Diagnostics;
using System.Diagnostics.Contracts;
using System.Runtime.Serialization;
using System.Security.Permissions;
[DebuggerTypeProxy(typeof(Mscorlib_DictionaryDebugView<,>))]
[DebuggerDisplay("Count = {Count}")]
[Serializable]
[System.Runtime.InteropServices.ComVisible(false)]
public class Dictionary<TKey,TValue>: IDictionary<TKey,TValue>, IDictionary, IReadOnlyDictionary<TKey, TValue>, ISerializable, IDeserializationCallback {
private struct Entry {
public int hashCode; // Lower 31 bits of hash code, -1 if unused
public int next; // Index of next entry, -1 if last
public TKey key; // Key of entry
public TValue value; // Value of entry
}
private int[] buckets;
private Entry[] entries;
private int count;
private int version;
private int freeList;
private int freeCount;
private IEqualityComparer<TKey> comparer;
private KeyCollection keys;
private ValueCollection values;
private Object _syncRoot;
// constants for serialization
private const String VersionName = "Version";
private const String HashSizeName = "HashSize"; // Must save buckets.Length
private const String KeyValuePairsName = "KeyValuePairs";
private const String ComparerName = "Comparer";
public Dictionary(): this(0, null) {}
public Dictionary(int capacity): this(capacity, null) {}
public Dictionary(IEqualityComparer<TKey> comparer): this(0, comparer) {}
public Dictionary(int capacity, IEqualityComparer<TKey> comparer) {
if (capacity < 0) ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument.capacity);
if (capacity > 0) Initialize(capacity);
this.comparer = comparer ?? EqualityComparer<TKey>.Default;
#if FEATURE_CORECLR
if (HashHelpers.s_UseRandomizedStringHashing && comparer == EqualityComparer<string>.Default)
{
this.comparer = (IEqualityComparer<TKey>) NonRandomizedStringEqualityComparer.Default;
}
#endif // FEATURE_CORECLR
}
public Dictionary(IDictionary<TKey,TValue> dictionary): this(dictionary, null) {}
public Dictionary(IDictionary<TKey,TValue> dictionary, IEqualityComparer<TKey> comparer):
this(dictionary != null? dictionary.Count: 0, comparer) {
if( dictionary == null) {
ThrowHelper.ThrowArgumentNullException(ExceptionArgument.dictionary);
}
foreach (KeyValuePair<TKey,TValue> pair in dictionary) {
Add(pair.Key, pair.Value);
}
}
protected Dictionary(SerializationInfo info, StreamingContext context) {
//We can't do anything with the keys and values until the entire graph has been deserialized
//and we have a resonable estimate that GetHashCode is not going to fail. For the time being,
//we'll just cache this. The graph is not valid until OnDeserialization has been called.
HashHelpers.SerializationInfoTable.Add(this, info);
}
public IEqualityComparer<TKey> Comparer {
get {
return comparer;
}
}
public int Count {
get { return count - freeCount; }
}
public KeyCollection Keys {
get {
Contract.Ensures(Contract.Result<KeyCollection>() != null);
if (keys == null) keys = new KeyCollection(this);
return keys;
}
}
ICollection<TKey> IDictionary<TKey, TValue>.Keys {
get {
if (keys == null) keys = new KeyCollection(this);
return keys;
}
}
IEnumerable<TKey> IReadOnlyDictionary<TKey, TValue>.Keys {
get {
if (keys == null) keys = new KeyCollection(this);
return keys;
}
}
public ValueCollection Values {
get {
Contract.Ensures(Contract.Result<ValueCollection>() != null);
if (values == null) values = new ValueCollection(this);
return values;
}
}
ICollection<TValue> IDictionary<TKey, TValue>.Values {
get {
if (values == null) values = new ValueCollection(this);
return values;
}
}
IEnumerable<TValue> IReadOnlyDictionary<TKey, TValue>.Values {
get {
if (values == null) values = new ValueCollection(this);
return values;
}
}
public TValue this[TKey key] {
get {
int i = FindEntry(key);
if (i >= 0) return entries[i].value;
ThrowHelper.ThrowKeyNotFoundException();
return default(TValue);
}
set {
Insert(key, value, false);
}
}
public void Add(TKey key, TValue value) {
Insert(key, value, true);
}
void ICollection<KeyValuePair<TKey, TValue>>.Add(KeyValuePair<TKey, TValue> keyValuePair) {
Add(keyValuePair.Key, keyValuePair.Value);
}
bool ICollection<KeyValuePair<TKey, TValue>>.Contains(KeyValuePair<TKey, TValue> keyValuePair) {
int i = FindEntry(keyValuePair.Key);
if( i >= 0 && EqualityComparer<TValue>.Default.Equals(entries[i].value, keyValuePair.Value)) {
return true;
}
return false;
}
bool ICollection<KeyValuePair<TKey, TValue>>.Remove(KeyValuePair<TKey, TValue> keyValuePair) {
int i = FindEntry(keyValuePair.Key);
if( i >= 0 && EqualityComparer<TValue>.Default.Equals(entries[i].value, keyValuePair.Value)) {
Remove(keyValuePair.Key);
return true;
}
return false;
}
public void Clear() {
if (count > 0) {
for (int i = 0; i < buckets.Length; i++) buckets[i] = -1;
Array.Clear(entries, 0, count);
freeList = -1;
count = 0;
freeCount = 0;
version++;
}
}
public bool ContainsKey(TKey key) {
return FindEntry(key) >= 0;
}
public bool ContainsValue(TValue value) {
if (value == null) {
for (int i = 0; i < count; i++) {
if (entries[i].hashCode >= 0 && entries[i].value == null) return true;
}
}
else {
EqualityComparer<TValue> c = EqualityComparer<TValue>.Default;
for (int i = 0; i < count; i++) {
if (entries[i].hashCode >= 0 && c.Equals(entries[i].value, value)) return true;
}
}
return false;
}
private void CopyTo(KeyValuePair<TKey,TValue>[] array, int index) {
if (array == null) {
ThrowHelper.ThrowArgumentNullException(ExceptionArgument.array);
}
if (index < 0 || index > array.Length ) {
ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument.index, ExceptionResource.ArgumentOutOfRange_NeedNonNegNum);
}
if (array.Length - index < Count) {
ThrowHelper.ThrowArgumentException(ExceptionResource.Arg_ArrayPlusOffTooSmall);
}
int count = this.count;
Entry[] entries = this.entries;
for (int i = 0; i < count; i++) {
if (entries[i].hashCode >= 0) {
array[index++] = new KeyValuePair<TKey,TValue>(entries[i].key, entries[i].value);
}
}
}
public Enumerator GetEnumerator() {
return new Enumerator(this, Enumerator.KeyValuePair);
}
IEnumerator<KeyValuePair<TKey, TValue>> IEnumerable<KeyValuePair<TKey, TValue>>.GetEnumerator() {
return new Enumerator(this, Enumerator.KeyValuePair);
}
[System.Security.SecurityCritical] // auto-generated_required
public virtual void GetObjectData(SerializationInfo info, StreamingContext context) {
if (info==null) {
ThrowHelper.ThrowArgumentNullException(ExceptionArgument.info);
}
info.AddValue(VersionName, version);
#if FEATURE_RANDOMIZED_STRING_HASHING
info.AddValue(ComparerName, HashHelpers.GetEqualityComparerForSerialization(comparer), typeof(IEqualityComparer<TKey>));
#else
info.AddValue(ComparerName, comparer, typeof(IEqualityComparer<TKey>));
#endif
info.AddValue(HashSizeName, buckets == null ? 0 : buckets.Length); //This is the length of the bucket array.
if( buckets != null) {
KeyValuePair<TKey, TValue>[] array = new KeyValuePair<TKey, TValue>[Count];
CopyTo(array, 0);
info.AddValue(KeyValuePairsName, array, typeof(KeyValuePair<TKey, TValue>[]));
}
}
private int FindEntry(TKey key) {
if( key == null) {
ThrowHelper.ThrowArgumentNullException(ExceptionArgument.key);
}
if (buckets != null) {
int hashCode = comparer.GetHashCode(key) & 0x7FFFFFFF;
for (int i = buckets[hashCode % buckets.Length]; i >= 0; i = entries[i].next) {
if (entries[i].hashCode == hashCode && comparer.Equals(entries[i].key, key)) return i;
}
}
return -1;
}
private void Initialize(int capacity) {
int size = HashHelpers.GetPrime(capacity);
buckets = new int[size];
for (int i = 0; i < buckets.Length; i++) buckets[i] = -1;
entries = new Entry[size];
freeList = -1;
}
private void Insert(TKey key, TValue value, bool add) {
if( key == null ) {
ThrowHelper.ThrowArgumentNullException(ExceptionArgument.key);
}
if (buckets == null) Initialize(0);
int hashCode = comparer.GetHashCode(key) & 0x7FFFFFFF;
int targetBucket = hashCode % buckets.Length;
#if FEATURE_RANDOMIZED_STRING_HASHING
int collisionCount = 0;
#endif
for (int i = buckets[targetBucket]; i >= 0; i = entries[i].next) {
if (entries[i].hashCode == hashCode && comparer.Equals(entries[i].key, key)) {
if (add) {
ThrowHelper.ThrowArgumentException(ExceptionResource.Argument_AddingDuplicate);
}
entries[i].value = value;
version++;
return;
}
#if FEATURE_RANDOMIZED_STRING_HASHING
collisionCount++;
#endif
}
int index;
if (freeCount > 0) {
index = freeList;
freeList = entries[index].next;
freeCount--;
}
else {
if (count == entries.Length)
{
Resize();
targetBucket = hashCode % buckets.Length;
}
index = count;
count++;
}
entries[index].hashCode = hashCode;
entries[index].next = buckets[targetBucket];
entries[index].key = key;
entries[index].value = value;
buckets[targetBucket] = index;
version++;
#if FEATURE_RANDOMIZED_STRING_HASHING
#if FEATURE_CORECLR
// In case we hit the collision threshold we'll need to switch to the comparer which is using randomized string hashing
// in this case will be EqualityComparer<string>.Default.
// Note, randomized string hashing is turned on by default on coreclr so EqualityComparer<string>.Default will
// be using randomized string hashing
if (collisionCount > HashHelpers.HashCollisionThreshold && comparer == NonRandomizedStringEqualityComparer.Default)
{
comparer = (IEqualityComparer<TKey>) EqualityComparer<string>.Default;
Resize(entries.Length, true);
}
#else
if(collisionCount > HashHelpers.HashCollisionThreshold && HashHelpers.IsWellKnownEqualityComparer(comparer))
{
comparer = (IEqualityComparer<TKey>) HashHelpers.GetRandomizedEqualityComparer(comparer);
Resize(entries.Length, true);
}
#endif // FEATURE_CORECLR
#endif
}
public virtual void OnDeserialization(Object sender) {
SerializationInfo siInfo;
HashHelpers.SerializationInfoTable.TryGetValue(this, out siInfo);
if (siInfo==null) {
// It might be necessary to call OnDeserialization from a container if the container object also implements
// OnDeserialization. However, remoting will call OnDeserialization again.
// We can return immediately if this function is called twice.
// Note we set remove the serialization info from the table at the end of this method.
return;
}
int realVersion = siInfo.GetInt32(VersionName);
int hashsize = siInfo.GetInt32(HashSizeName);
comparer = (IEqualityComparer<TKey>)siInfo.GetValue(ComparerName, typeof(IEqualityComparer<TKey>));
if( hashsize != 0) {
buckets = new int[hashsize];
for (int i = 0; i < buckets.Length; i++) buckets[i] = -1;
entries = new Entry[hashsize];
freeList = -1;
KeyValuePair<TKey, TValue>[] array = (KeyValuePair<TKey, TValue>[])
siInfo.GetValue(KeyValuePairsName, typeof(KeyValuePair<TKey, TValue>[]));
if (array==null) {
ThrowHelper.ThrowSerializationException(ExceptionResource.Serialization_MissingKeys);
}
for (int i=0; i<array.Length; i++) {
if ( array[i].Key == null) {
ThrowHelper.ThrowSerializationException(ExceptionResource.Serialization_NullKey);
}
Insert(array[i].Key, array[i].Value, true);
}
}
else {
buckets = null;
}
version = realVersion;
HashHelpers.SerializationInfoTable.Remove(this);
}
private void Resize() {
Resize(HashHelpers.ExpandPrime(count), false);
}
private void Resize(int newSize, bool forceNewHashCodes) {
Contract.Assert(newSize >= entries.Length);
int[] newBuckets = new int[newSize];
for (int i = 0; i < newBuckets.Length; i++) newBuckets[i] = -1;
Entry[] newEntries = new Entry[newSize];
Array.Copy(entries, 0, newEntries, 0, count);
if(forceNewHashCodes) {
for (int i = 0; i < count; i++) {
if(newEntries[i].hashCode != -1) {
newEntries[i].hashCode = (comparer.GetHashCode(newEntries[i].key) & 0x7FFFFFFF);
}
}
}
for (int i = 0; i < count; i++) {
if (newEntries[i].hashCode >= 0) {
int bucket = newEntries[i].hashCode % newSize;
newEntries[i].next = newBuckets[bucket];
newBuckets[bucket] = i;
}
}
buckets = newBuckets;
entries = newEntries;
}
public bool Remove(TKey key) {
if(key == null) {
ThrowHelper.ThrowArgumentNullException(ExceptionArgument.key);
}
if (buckets != null) {
int hashCode = comparer.GetHashCode(key) & 0x7FFFFFFF;
int bucket = hashCode % buckets.Length;
int last = -1;
for (int i = buckets[bucket]; i >= 0; last = i, i = entries[i].next) {
if (entries[i].hashCode == hashCode && comparer.Equals(entries[i].key, key)) {
if (last < 0) {
buckets[bucket] = entries[i].next;
}
else {
entries[last].next = entries[i].next;
}
entries[i].hashCode = -1;
entries[i].next = freeList;
entries[i].key = default(TKey);
entries[i].value = default(TValue);
freeList = i;
freeCount++;
version++;
return true;
}
}
}
return false;
}
public bool TryGetValue(TKey key, out TValue value) {
int i = FindEntry(key);
if (i >= 0) {
value = entries[i].value;
return true;
}
value = default(TValue);
return false;
}
// This is a convenience method for the internal callers that were converted from using Hashtable.
// Many were combining key doesn't exist and key exists but null value (for non-value types) checks.
// This allows them to continue getting that behavior with minimal code delta. This is basically
// TryGetValue without the out param
internal TValue GetValueOrDefault(TKey key) {
int i = FindEntry(key);
if (i >= 0) {
return entries[i].value;
}
return default(TValue);
}
bool ICollection<KeyValuePair<TKey,TValue>>.IsReadOnly {
get { return false; }
}
void ICollection<KeyValuePair<TKey,TValue>>.CopyTo(KeyValuePair<TKey,TValue>[] array, int index) {
CopyTo(array, index);
}
void ICollection.CopyTo(Array array, int index) {
if (array == null) {
ThrowHelper.ThrowArgumentNullException(ExceptionArgument.array);
}
if (array.Rank != 1) {
ThrowHelper.ThrowArgumentException(ExceptionResource.Arg_RankMultiDimNotSupported);
}
if( array.GetLowerBound(0) != 0 ) {
ThrowHelper.ThrowArgumentException(ExceptionResource.Arg_NonZeroLowerBound);
}
if (index < 0 || index > array.Length) {
ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument.index, ExceptionResource.ArgumentOutOfRange_NeedNonNegNum);
}
if (array.Length - index < Count) {
ThrowHelper.ThrowArgumentException(ExceptionResource.Arg_ArrayPlusOffTooSmall);
}
KeyValuePair<TKey,TValue>[] pairs = array as KeyValuePair<TKey,TValue>[];
if (pairs != null) {
CopyTo(pairs, index);
}
else if( array is DictionaryEntry[]) {
DictionaryEntry[] dictEntryArray = array as DictionaryEntry[];
Entry[] entries = this.entries;
for (int i = 0; i < count; i++) {
if (entries[i].hashCode >= 0) {
dictEntryArray[index++] = new DictionaryEntry(entries[i].key, entries[i].value);
}
}
}
else {
object[] objects = array as object[];
if (objects == null) {
ThrowHelper.ThrowArgumentException(ExceptionResource.Argument_InvalidArrayType);
}
try {
int count = this.count;
Entry[] entries = this.entries;
for (int i = 0; i < count; i++) {
if (entries[i].hashCode >= 0) {
objects[index++] = new KeyValuePair<TKey,TValue>(entries[i].key, entries[i].value);
}
}
}
catch(ArrayTypeMismatchException) {
ThrowHelper.ThrowArgumentException(ExceptionResource.Argument_InvalidArrayType);
}
}
}
IEnumerator IEnumerable.GetEnumerator() {
return new Enumerator(this, Enumerator.KeyValuePair);
}
bool ICollection.IsSynchronized {
get { return false; }
}
object ICollection.SyncRoot {
get {
if( _syncRoot == null) {
System.Threading.Interlocked.CompareExchange<Object>(ref _syncRoot, new Object(), null);
}
return _syncRoot;
}
}
bool IDictionary.IsFixedSize {
get { return false; }
}
bool IDictionary.IsReadOnly {
get { return false; }
}
ICollection IDictionary.Keys {
get { return (ICollection)Keys; }
}
ICollection IDictionary.Values {
get { return (ICollection)Values; }
}
object IDictionary.this[object key] {
get {
if( IsCompatibleKey(key)) {
int i = FindEntry((TKey)key);
if (i >= 0) {
return entries[i].value;
}
}
return null;
}
set {
if (key == null)
{
ThrowHelper.ThrowArgumentNullException(ExceptionArgument.key);
}
ThrowHelper.IfNullAndNullsAreIllegalThenThrow<TValue>(value, ExceptionArgument.value);
try {
TKey tempKey = (TKey)key;
try {
this[tempKey] = (TValue)value;
}
catch (InvalidCastException) {
ThrowHelper.ThrowWrongValueTypeArgumentException(value, typeof(TValue));
}
}
catch (InvalidCastException) {
ThrowHelper.ThrowWrongKeyTypeArgumentException(key, typeof(TKey));
}
}
}
private static bool IsCompatibleKey(object key) {
if( key == null) {
ThrowHelper.ThrowArgumentNullException(ExceptionArgument.key);
}
return (key is TKey);
}
void IDictionary.Add(object key, object value) {
if (key == null)
{
ThrowHelper.ThrowArgumentNullException(ExceptionArgument.key);
}
ThrowHelper.IfNullAndNullsAreIllegalThenThrow<TValue>(value, ExceptionArgument.value);
try {
TKey tempKey = (TKey)key;
try {
Add(tempKey, (TValue)value);
}
catch (InvalidCastException) {
ThrowHelper.ThrowWrongValueTypeArgumentException(value, typeof(TValue));
}
}
catch (InvalidCastException) {
ThrowHelper.ThrowWrongKeyTypeArgumentException(key, typeof(TKey));
}
}
bool IDictionary.Contains(object key) {
if(IsCompatibleKey(key)) {
return ContainsKey((TKey)key);
}
return false;
}
IDictionaryEnumerator IDictionary.GetEnumerator() {
return new Enumerator(this, Enumerator.DictEntry);
}
void IDictionary.Remove(object key) {
if(IsCompatibleKey(key)) {
Remove((TKey)key);
}
}
[Serializable]
public struct Enumerator: IEnumerator<KeyValuePair<TKey,TValue>>,
IDictionaryEnumerator
{
private Dictionary<TKey,TValue> dictionary;
private int version;
private int index;
private KeyValuePair<TKey,TValue> current;
private int getEnumeratorRetType; // What should Enumerator.Current return?
internal const int DictEntry = 1;
internal const int KeyValuePair = 2;
internal Enumerator(Dictionary<TKey,TValue> dictionary, int getEnumeratorRetType) {
this.dictionary = dictionary;
version = dictionary.version;
index = 0;
this.getEnumeratorRetType = getEnumeratorRetType;
current = new KeyValuePair<TKey, TValue>();
}
public bool MoveNext() {
if (version != dictionary.version) {
ThrowHelper.ThrowInvalidOperationException(ExceptionResource.InvalidOperation_EnumFailedVersion);
}
// Use unsigned comparison since we set index to dictionary.count+1 when the enumeration ends.
// dictionary.count+1 could be negative if dictionary.count is Int32.MaxValue
while ((uint)index < (uint)dictionary.count) {
if (dictionary.entries[index].hashCode >= 0) {
current = new KeyValuePair<TKey, TValue>(dictionary.entries[index].key, dictionary.entries[index].value);
index++;
return true;
}
index++;
}
index = dictionary.count + 1;
current = new KeyValuePair<TKey, TValue>();
return false;
}
public KeyValuePair<TKey,TValue> Current {
get { return current; }
}
public void Dispose() {
}
object IEnumerator.Current {
get {
if( index == 0 || (index == dictionary.count + 1)) {
ThrowHelper.ThrowInvalidOperationException(ExceptionResource.InvalidOperation_EnumOpCantHappen);
}
if (getEnumeratorRetType == DictEntry) {
return new System.Collections.DictionaryEntry(current.Key, current.Value);
} else {
return new KeyValuePair<TKey, TValue>(current.Key, current.Value);
}
}
}
void IEnumerator.Reset() {
if (version != dictionary.version) {
ThrowHelper.ThrowInvalidOperationException(ExceptionResource.InvalidOperation_EnumFailedVersion);
}
index = 0;
current = new KeyValuePair<TKey, TValue>();
}
DictionaryEntry IDictionaryEnumerator.Entry {
get {
if( index == 0 || (index == dictionary.count + 1)) {
ThrowHelper.ThrowInvalidOperationException(ExceptionResource.InvalidOperation_EnumOpCantHappen);
}
return new DictionaryEntry(current.Key, current.Value);
}
}
object IDictionaryEnumerator.Key {
get {
if( index == 0 || (index == dictionary.count + 1)) {
ThrowHelper.ThrowInvalidOperationException(ExceptionResource.InvalidOperation_EnumOpCantHappen);
}
return current.Key;
}
}
object IDictionaryEnumerator.Value {
get {
if( index == 0 || (index == dictionary.count + 1)) {
ThrowHelper.ThrowInvalidOperationException(ExceptionResource.InvalidOperation_EnumOpCantHappen);
}
return current.Value;
}
}
}
[DebuggerTypeProxy(typeof(Mscorlib_DictionaryKeyCollectionDebugView<,>))]
[DebuggerDisplay("Count = {Count}")]
[Serializable]
public sealed class KeyCollection: ICollection<TKey>, ICollection, IReadOnlyCollection<TKey>
{
private Dictionary<TKey,TValue> dictionary;
public KeyCollection(Dictionary<TKey,TValue> dictionary) {
if (dictionary == null) {
ThrowHelper.ThrowArgumentNullException(ExceptionArgument.dictionary);
}
this.dictionary = dictionary;
}
public Enumerator GetEnumerator() {
return new Enumerator(dictionary);
}
public void CopyTo(TKey[] array, int index) {
if (array == null) {
ThrowHelper.ThrowArgumentNullException(ExceptionArgument.array);
}
if (index < 0 || index > array.Length) {
ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument.index, ExceptionResource.ArgumentOutOfRange_NeedNonNegNum);
}
if (array.Length - index < dictionary.Count) {
ThrowHelper.ThrowArgumentException(ExceptionResource.Arg_ArrayPlusOffTooSmall);
}
int count = dictionary.count;
Entry[] entries = dictionary.entries;
for (int i = 0; i < count; i++) {
if (entries[i].hashCode >= 0) array[index++] = entries[i].key;
}
}
public int Count {
get { return dictionary.Count; }
}
bool ICollection<TKey>.IsReadOnly {
get { return true; }
}
void ICollection<TKey>.Add(TKey item){
ThrowHelper.ThrowNotSupportedException(ExceptionResource.NotSupported_KeyCollectionSet);
}
void ICollection<TKey>.Clear(){
ThrowHelper.ThrowNotSupportedException(ExceptionResource.NotSupported_KeyCollectionSet);
}
bool ICollection<TKey>.Contains(TKey item){
return dictionary.ContainsKey(item);
}
bool ICollection<TKey>.Remove(TKey item){
ThrowHelper.ThrowNotSupportedException(ExceptionResource.NotSupported_KeyCollectionSet);
return false;
}
IEnumerator<TKey> IEnumerable<TKey>.GetEnumerator() {
return new Enumerator(dictionary);
}
IEnumerator IEnumerable.GetEnumerator() {
return new Enumerator(dictionary);
}
void ICollection.CopyTo(Array array, int index) {
if (array==null) {
ThrowHelper.ThrowArgumentNullException(ExceptionArgument.array);
}
if (array.Rank != 1) {
ThrowHelper.ThrowArgumentException(ExceptionResource.Arg_RankMultiDimNotSupported);
}
if( array.GetLowerBound(0) != 0 ) {
ThrowHelper.ThrowArgumentException(ExceptionResource.Arg_NonZeroLowerBound);
}
if (index < 0 || index > array.Length) {
ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument.index, ExceptionResource.ArgumentOutOfRange_NeedNonNegNum);
}
if (array.Length - index < dictionary.Count) {
ThrowHelper.ThrowArgumentException(ExceptionResource.Arg_ArrayPlusOffTooSmall);
}
TKey[] keys = array as TKey[];
if (keys != null) {
CopyTo(keys, index);
}
else {
object[] objects = array as object[];
if (objects == null) {
ThrowHelper.ThrowArgumentException(ExceptionResource.Argument_InvalidArrayType);
}
int count = dictionary.count;
Entry[] entries = dictionary.entries;
try {
for (int i = 0; i < count; i++) {
if (entries[i].hashCode >= 0) objects[index++] = entries[i].key;
}
}
catch(ArrayTypeMismatchException) {
ThrowHelper.ThrowArgumentException(ExceptionResource.Argument_InvalidArrayType);
}
}
}
bool ICollection.IsSynchronized {
get { return false; }
}
Object ICollection.SyncRoot {
get { return ((ICollection)dictionary).SyncRoot; }
}
[Serializable]
public struct Enumerator : IEnumerator<TKey>, System.Collections.IEnumerator
{
private Dictionary<TKey, TValue> dictionary;
private int index;
private int version;
private TKey currentKey;
internal Enumerator(Dictionary<TKey, TValue> dictionary) {
this.dictionary = dictionary;
version = dictionary.version;
index = 0;
currentKey = default(TKey);
}
public void Dispose() {
}
public bool MoveNext() {
if (version != dictionary.version) {
ThrowHelper.ThrowInvalidOperationException(ExceptionResource.InvalidOperation_EnumFailedVersion);
}
while ((uint)index < (uint)dictionary.count) {
if (dictionary.entries[index].hashCode >= 0) {
currentKey = dictionary.entries[index].key;
index++;
return true;
}
index++;
}
index = dictionary.count + 1;
currentKey = default(TKey);
return false;
}
public TKey Current {
get {
return currentKey;
}
}
Object System.Collections.IEnumerator.Current {
get {
if( index == 0 || (index == dictionary.count + 1)) {
ThrowHelper.ThrowInvalidOperationException(ExceptionResource.InvalidOperation_EnumOpCantHappen);
}
return currentKey;
}
}
void System.Collections.IEnumerator.Reset() {
if (version != dictionary.version) {
ThrowHelper.ThrowInvalidOperationException(ExceptionResource.InvalidOperation_EnumFailedVersion);
}
index = 0;
currentKey = default(TKey);
}
}
}
[DebuggerTypeProxy(typeof(Mscorlib_DictionaryValueCollectionDebugView<,>))]
[DebuggerDisplay("Count = {Count}")]
[Serializable]
public sealed class ValueCollection: ICollection<TValue>, ICollection, IReadOnlyCollection<TValue>
{
private Dictionary<TKey,TValue> dictionary;
public ValueCollection(Dictionary<TKey,TValue> dictionary) {
if (dictionary == null) {
ThrowHelper.ThrowArgumentNullException(ExceptionArgument.dictionary);
}
this.dictionary = dictionary;
}
public Enumerator GetEnumerator() {
return new Enumerator(dictionary);
}
public void CopyTo(TValue[] array, int index) {
if (array == null) {
ThrowHelper.ThrowArgumentNullException(ExceptionArgument.array);
}
if (index < 0 || index > array.Length) {
ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument.index, ExceptionResource.ArgumentOutOfRange_NeedNonNegNum);
}
if (array.Length - index < dictionary.Count) {
ThrowHelper.ThrowArgumentException(ExceptionResource.Arg_ArrayPlusOffTooSmall);
}
int count = dictionary.count;
Entry[] entries = dictionary.entries;
for (int i = 0; i < count; i++) {
if (entries[i].hashCode >= 0) array[index++] = entries[i].value;
}
}
public int Count {
get { return dictionary.Count; }
}
bool ICollection<TValue>.IsReadOnly {
get { return true; }
}
void ICollection<TValue>.Add(TValue item){
ThrowHelper.ThrowNotSupportedException(ExceptionResource.NotSupported_ValueCollectionSet);
}
bool ICollection<TValue>.Remove(TValue item){
ThrowHelper.ThrowNotSupportedException(ExceptionResource.NotSupported_ValueCollectionSet);
return false;
}
void ICollection<TValue>.Clear(){
ThrowHelper.ThrowNotSupportedException(ExceptionResource.NotSupported_ValueCollectionSet);
}
bool ICollection<TValue>.Contains(TValue item){
return dictionary.ContainsValue(item);
}
IEnumerator<TValue> IEnumerable<TValue>.GetEnumerator() {
return new Enumerator(dictionary);
}
IEnumerator IEnumerable.GetEnumerator() {
return new Enumerator(dictionary);
}
void ICollection.CopyTo(Array array, int index) {
if (array == null) {
ThrowHelper.ThrowArgumentNullException(ExceptionArgument.array);
}
if (array.Rank != 1) {
ThrowHelper.ThrowArgumentException(ExceptionResource.Arg_RankMultiDimNotSupported);
}
if( array.GetLowerBound(0) != 0 ) {
ThrowHelper.ThrowArgumentException(ExceptionResource.Arg_NonZeroLowerBound);
}
if (index < 0 || index > array.Length) {
ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument.index, ExceptionResource.ArgumentOutOfRange_NeedNonNegNum);
}
if (array.Length - index < dictionary.Count)
ThrowHelper.ThrowArgumentException(ExceptionResource.Arg_ArrayPlusOffTooSmall);
TValue[] values = array as TValue[];
if (values != null) {
CopyTo(values, index);
}
else {
object[] objects = array as object[];
if (objects == null) {
ThrowHelper.ThrowArgumentException(ExceptionResource.Argument_InvalidArrayType);
}
int count = dictionary.count;
Entry[] entries = dictionary.entries;
try {
for (int i = 0; i < count; i++) {
if (entries[i].hashCode >= 0) objects[index++] = entries[i].value;
}
}
catch(ArrayTypeMismatchException) {
ThrowHelper.ThrowArgumentException(ExceptionResource.Argument_InvalidArrayType);
}
}
}
bool ICollection.IsSynchronized {
get { return false; }
}
Object ICollection.SyncRoot {
get { return ((ICollection)dictionary).SyncRoot; }
}
[Serializable]
public struct Enumerator : IEnumerator<TValue>, System.Collections.IEnumerator
{
private Dictionary<TKey, TValue> dictionary;
private int index;
private int version;
private TValue currentValue;
internal Enumerator(Dictionary<TKey, TValue> dictionary) {
this.dictionary = dictionary;
version = dictionary.version;
index = 0;
currentValue = default(TValue);
}
public void Dispose() {
}
public bool MoveNext() {
if (version != dictionary.version) {
ThrowHelper.ThrowInvalidOperationException(ExceptionResource.InvalidOperation_EnumFailedVersion);
}
while ((uint)index < (uint)dictionary.count) {
if (dictionary.entries[index].hashCode >= 0) {
currentValue = dictionary.entries[index].value;
index++;
return true;
}
index++;
}
index = dictionary.count + 1;
currentValue = default(TValue);
return false;
}
public TValue Current {
get {
return currentValue;
}
}
Object System.Collections.IEnumerator.Current {
get {
if( index == 0 || (index == dictionary.count + 1)) {
ThrowHelper.ThrowInvalidOperationException(ExceptionResource.InvalidOperation_EnumOpCantHappen);
}
return currentValue;
}
}
void System.Collections.IEnumerator.Reset() {
if (version != dictionary.version) {
ThrowHelper.ThrowInvalidOperationException(ExceptionResource.InvalidOperation_EnumFailedVersion);
}
index = 0;
currentValue = default(TValue);
}
}
}
}
}
|