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
|
//------------------------------------------------------------------------------
// <copyright file="ColumnTypeConverter.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
// <owner current="true" primary="true">Microsoft</owner>
// <owner current="true" primary="false">Microsoft</owner>
// <owner current="false" primary="false">Microsoft</owner>
//------------------------------------------------------------------------------
/*
*/
namespace System.Data {
using System.ComponentModel;
using System.ComponentModel.Design.Serialization;
using System.Diagnostics;
using System.Globalization;
using System.Data.SqlTypes;
/// <devdoc>
/// <para>Provides a type
/// converter that can be used to populate a list box with available types.</para>
/// </devdoc>
internal sealed class ColumnTypeConverter : TypeConverter {
private static Type[] types = new Type[] {
typeof(Boolean),
typeof(Byte),
typeof(Byte[]),
typeof(Char),
typeof(DateTime),
typeof(Decimal),
typeof(Double),
typeof(Guid),
typeof(Int16),
typeof(Int32),
typeof(Int64),
typeof(object),
typeof(SByte),
typeof(Single),
typeof(string),
typeof(TimeSpan),
typeof(UInt16),
typeof(UInt32),
typeof(UInt64),
typeof(SqlInt16),
typeof(SqlInt32),
typeof(SqlInt64),
typeof(SqlDecimal),
typeof(SqlSingle),
typeof(SqlDouble),
typeof(SqlString),
typeof(SqlBoolean),
typeof(SqlBinary),
typeof(SqlByte),
typeof(SqlDateTime),
typeof(SqlGuid),
typeof(SqlMoney),
typeof(SqlBytes),
typeof(SqlChars),
typeof(SqlXml)
};
private StandardValuesCollection values;
// converter classes should have public ctor
public ColumnTypeConverter() {
}
/// <devdoc>
/// <para>Gets a value indicating whether this converter can
/// convert an object to the given destination type using the context.</para>
/// </devdoc>
public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType) {
if (destinationType == typeof(InstanceDescriptor)) {
return true;
}
return base.CanConvertTo(context, destinationType);
}
/// <devdoc>
/// <para>Converts the given value object to the specified destination type.</para>
/// </devdoc>
public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType) {
if (destinationType == null) {
throw new ArgumentNullException("destinationType");
}
if (destinationType == typeof(string)) {
if (value == null) {
return String.Empty;
}
else {
value.ToString();
}
}
if (value != null && destinationType == typeof(InstanceDescriptor)) {
Object newValue = value;
if (value is string) {
for (int i = 0; i < types.Length; i++) {
if (types[i].ToString().Equals(value))
newValue = types[i];
}
}
if (value is Type || value is string) {
System.Reflection.MethodInfo method = typeof(Type).GetMethod("GetType", new Type[] {typeof(string)}); // change done for security review
if (method != null) {
return new InstanceDescriptor(method, new object[] {((Type)newValue).AssemblyQualifiedName});
}
}
}
return base.ConvertTo(context, culture, value, destinationType);
}
public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType) {
if (sourceType == typeof(string)) {
return true;
}
return base.CanConvertTo(context, sourceType);
}
public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value) {
if (value != null && value.GetType() == typeof(string)) {
for (int i = 0; i < types.Length; i++) {
if (types[i].ToString().Equals(value))
return types[i];
}
return typeof(string);
}
return base.ConvertFrom(context, culture, value);
}
/// <devdoc>
/// <para>Gets a collection of standard values for the data type this validator is
/// designed for.</para>
/// </devdoc>
public override StandardValuesCollection GetStandardValues(ITypeDescriptorContext context) {
if (values == null) {
object[] objTypes;
if (types != null) {
objTypes = new object[types.Length];
Array.Copy(types, objTypes, types.Length);
}
else {
objTypes = null;
}
values = new StandardValuesCollection(objTypes);
}
return values;
}
/// <devdoc>
/// <para>Gets a value indicating whether the list of standard values returned from
/// <see cref='System.ComponentModel.TypeListConverter.GetStandardValues'/> is an exclusive list. </para>
/// </devdoc>
public override bool GetStandardValuesExclusive(ITypeDescriptorContext context) {
return true;
}
/// <devdoc>
/// <para>Gets a value indicating whether this object supports a
/// standard set of values that can be picked from a list using the specified
/// context.</para>
/// </devdoc>
public override bool GetStandardValuesSupported(ITypeDescriptorContext context) {
return true;
}
}
}
|
