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;
using System.Runtime.CompilerServices;
namespace Newtonsoft.Json.Converters
{
[System.Runtime.CompilerServices.NullableContext(1)]
[System.Runtime.CompilerServices.Nullable(0)]
public class BinaryConverter : JsonConverter
{
public override void WriteJson(JsonWriter writer, [System.Runtime.CompilerServices.Nullable(2)] object value, JsonSerializer serializer)
{
if (value == null)
writer.WriteNull();
else {
byte[] byteArray = GetByteArray(value);
writer.WriteValue(byteArray);
}
}
private byte[] GetByteArray(object value)
{
if (value is SqlBinary)
return ((SqlBinary)value).Value;
throw new JsonSerializationException("Unexpected value type when writing binary: {0}".FormatWith(CultureInfo.InvariantCulture, value.GetType()));
}
[return: System.Runtime.CompilerServices.Nullable(2)]
public override object ReadJson(JsonReader reader, Type objectType, [System.Runtime.CompilerServices.Nullable(2)] object existingValue, JsonSerializer serializer)
{
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[] value;
if (reader.TokenType == JsonToken.StartArray)
value = 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));
value = Convert.FromBase64String(reader.Value.ToString());
}
if ((object)(ReflectionUtils.IsNullableType(objectType) ? Nullable.GetUnderlyingType(objectType) : objectType) == typeof(SqlBinary))
return new SqlBinary(value);
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 ((object)objectType == typeof(SqlBinary) || (object)objectType == typeof(SqlBinary?))
return true;
return false;
}
}
}