在处理字节数组时,当我试图反序列化下面的JSON时,我得到了以下异常,有什么问题吗?
public class Program
{
public static void Main()
{
var root = JsonSerializer.Deserialize<JsonRoot>(@"{ ""ByteArray"": [1] } ");
}
public class JsonRoot
{
public byte[] ByteArray {get;set;}
}
}
Unhandled exception. System.Text.Json.JsonException: The JSON value could not be converted to System.Byte[]. Path: $.ByteArray | LineNumber: 0 | BytePositionInLine: 16.
---> System.InvalidOperationException: Cannot get the value of a token type 'StartArray' as a string.
at System.Text.Json.Utf8JsonReader.TryGetBytesFromBase64(Byte[]& value)
at System.Text.Json.Utf8JsonReader.GetBytesFromBase64()
at System.Text.Json.Serialization.Converters.JsonConverterByteArray.Read(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options)
at System.Text.Json.JsonPropertyInfoNotNullable`4.OnRead(ReadStack& state, Utf8JsonReader& reader)
at System.Text.Json.JsonPropertyInfo.Read(JsonTokenType tokenType, ReadStack& state, Utf8JsonReader& reader)
at System.Text.Json.JsonSerializer.ReadCore(JsonSerializerOptions options, Utf8JsonReader& reader, ReadStack& readStack)
--- End of inner exception stack trace ---
at System.Text.Json.ThrowHelper.ReThrowWithPath(ReadStack& readStack, Utf8JsonReader& reader, Exception ex)
at System.Text.Json.JsonSerializer.ReadCore(JsonSerializerOptions options, Utf8JsonReader& reader, ReadStack& readStack)
at System.Text.Json.JsonSerializer.ReadCore(Type returnType, JsonSerializerOptions options, Utf8JsonReader& reader)
at System.Text.Json.JsonSerializer.Deserialize(String json, Type returnType, JsonSerializerOptions options)
at System.Text.Json.JsonSerializer.Deserialize[TValue](String json, JsonSerializerOptions options)
at Program.Main()
Command terminated by signal 6
发布于 2020-05-03 04:58:33
使用Sytem.Text.Json
,字节数组(byte[]
)将被序列化为base64字符串。他们声明,他们不会添加对在github issue中序列化为数字数组的byte[]
的支持。
这是一个自定义的转换器,应该可以让你入门。也许您可以对读取进行一些优化,但这种方法对性能的影响应该不会太差。你可能想要添加null和错误处理,但是你已经明白了。
要应用自定义转换器,您必须将它们添加到JsonSerializerOptions
。请参考this docs page。
public class ByteArrayConverter : JsonConverter<byte[]>
{
public override byte[] Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
{
short[] sByteArray = JsonSerializer.Deserialize<short[]>(ref reader);
byte[] value = new byte[sByteArray.Length];
for (int i = 0; i < sByteArray.Length; i++)
{
value[i] = (byte)sByteArray[i];
}
return value;
}
public override void Write(Utf8JsonWriter writer, byte[] value, JsonSerializerOptions options)
{
writer.WriteStartArray();
foreach (var val in value)
{
writer.WriteNumberValue(val);
}
writer.WriteEndArray();
}
}
https://stackoverflow.com/questions/61565947
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