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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Newtonsoft.Json.Utilities;
using System.Reflection;
namespace Newtonsoft.Json.Converters
{
/// <summary>
/// Converts a <see cref="KeyValuePair{TKey,TValue}"/> to and from JSON.
/// </summary>
public class KeyValuePairConverter : JsonConverter
{
/// <summary>
/// Writes the JSON representation of the object.
/// </summary>
/// <param name="writer">The <see cref="JsonWriter"/> to write to.</param>
/// <param name="value">The value.</param>
/// <param name="serializer">The calling serializer.</param>
public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
{
Type t = value.GetType();
PropertyInfo keyProperty = t.GetProperty("Key");
PropertyInfo valueProperty = t.GetProperty("Value");
writer.WriteStartObject();
writer.WritePropertyName("Key");
serializer.Serialize(writer, ReflectionUtils.GetMemberValue(keyProperty, value));
writer.WritePropertyName("Value");
serializer.Serialize(writer, ReflectionUtils.GetMemberValue(valueProperty, value));
writer.WriteEndObject();
}
/// <summary>
/// Reads the JSON representation of the object.
/// </summary>
/// <param name="reader">The <see cref="JsonReader"/> to read from.</param>
/// <param name="objectType">Type of the object.</param>
/// <param name="existingValue">The existing value of object being read.</param>
/// <param name="serializer">The calling serializer.</param>
/// <returns>The object value.</returns>
public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
{
bool isNullable = ReflectionUtils.IsNullableType(objectType);
if (reader.TokenType == JsonToken.Null)
{
if (!isNullable)
throw new Exception("Could not deserialize Null to KeyValuePair.");
return null;
}
Type t = (isNullable)
? Nullable.GetUnderlyingType(objectType)
: objectType;
IList<Type> genericArguments = t.GetGenericArguments();
Type keyType = genericArguments[0];
Type valueType = genericArguments[1];
object key = null;
object value = null;
reader.Read();
while (reader.TokenType == JsonToken.PropertyName)
{
switch (reader.Value.ToString())
{
case "Key":
reader.Read();
key = serializer.Deserialize(reader, keyType);
break;
case "Value":
reader.Read();
value = serializer.Deserialize(reader, valueType);
break;
default:
reader.Skip();
break;
}
reader.Read();
}
return ReflectionUtils.CreateInstance(t, key, value);
}
/// <summary>
/// Determines whether this instance can convert the specified object type.
/// </summary>
/// <param name="objectType">Type of the object.</param>
/// <returns>
/// <c>true</c> if this instance can convert the specified object type; otherwise, <c>false</c>.
/// </returns>
public override bool CanConvert(Type objectType)
{
Type t = (ReflectionUtils.IsNullableType(objectType))
? Nullable.GetUnderlyingType(objectType)
: objectType;
if (t.IsValueType && t.IsGenericType)
return (t.GetGenericTypeDefinition() == typeof(KeyValuePair<,>));
return false;
}
}
}
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