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executable file 75 lines (68 sloc) 2.856 kb
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)
{
IList<Type> genericArguments = objectType.GetGenericArguments();
Type keyType = genericArguments[0];
Type valueType = genericArguments[1];
reader.Read();
reader.Read();
object key = serializer.Deserialize(reader, keyType);
reader.Read();
reader.Read();
object value = serializer.Deserialize(reader, valueType);
reader.Read();
return ReflectionUtils.CreateInstance(objectType, 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)
{
if (objectType.IsValueType && objectType.IsGenericType)
return (objectType.GetGenericTypeDefinition() == typeof (KeyValuePair<,>));
return false;
}
}
}
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