BinaryConverter
Converts a binary value to and from a base 64 string value.
using Newtonsoft.Json.Utilities;
using System;
using System.Collections.Generic;
using System.Data.SqlTypes;
using System.Globalization;
namespace Newtonsoft.Json.Converters
{
public class BinaryConverter : JsonConverter
{
private const string BinaryTypeName = "System.Data.Linq.Binary";
public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
{
if (value == null)
writer.WriteNull();
else {
byte[] byteArray = GetByteArray(value);
writer.WriteValue(byteArray);
}
}
private byte[] GetByteArray(object value)
{
if (value.GetType().AssignableToTypeName("System.Data.Linq.Binary")) {
IBinary binary = DynamicWrapper.CreateWrapper<IBinary>(value);
return binary.ToArray();
}
if (value is SqlBinary)
return ((SqlBinary)value).Value;
throw new JsonSerializationException("Unexpected value type when writing binary: {0}".FormatWith(CultureInfo.InvariantCulture, value.GetType()));
}
public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
{
Type type = ReflectionUtils.IsNullableType(objectType) ? Nullable.GetUnderlyingType(objectType) : objectType;
if (reader.TokenType == JsonToken.Null) {
if (!ReflectionUtils.IsNullable(objectType))
throw JsonSerializationException.Create(reader, "Cannot convert null value to {0}.".FormatWith(CultureInfo.InvariantCulture, objectType));
return null;
}
byte[] array;
if (reader.TokenType == JsonToken.StartArray)
array = ReadByteArray(reader);
else {
if (reader.TokenType != JsonToken.String)
throw JsonSerializationException.Create(reader, "Unexpected token parsing binary. Expected String or StartArray, got {0}.".FormatWith(CultureInfo.InvariantCulture, reader.TokenType));
string s = reader.Value.ToString();
array = Convert.FromBase64String(s);
}
if (type.AssignableToTypeName("System.Data.Linq.Binary"))
return Activator.CreateInstance(type, array);
if (type == typeof(SqlBinary))
return new SqlBinary(array);
throw JsonSerializationException.Create(reader, "Unexpected object type when writing binary: {0}".FormatWith(CultureInfo.InvariantCulture, objectType));
}
private byte[] ReadByteArray(JsonReader reader)
{
List<byte> list = new List<byte>();
while (reader.Read()) {
switch (reader.TokenType) {
case JsonToken.Integer:
list.Add(Convert.ToByte(reader.Value, CultureInfo.InvariantCulture));
break;
case JsonToken.EndArray:
return list.ToArray();
default:
throw JsonSerializationException.Create(reader, "Unexpected token when reading bytes: {0}".FormatWith(CultureInfo.InvariantCulture, reader.TokenType));
case JsonToken.Comment:
break;
}
}
throw JsonSerializationException.Create(reader, "Unexpected end when reading bytes.");
}
public override bool CanConvert(Type objectType)
{
if (objectType.AssignableToTypeName("System.Data.Linq.Binary"))
return true;
if (objectType == typeof(SqlBinary) || objectType == typeof(SqlBinary?))
return true;
return false;
}
}
}