long to string

[DotNetNext]

public long Id{get;set;}

What's the easiest way to do that

{id:"1231231313131"}

[elgonzo]

Write a custom JsonConverter that converts a value to a string and writes the converted string value directly to the JsonWriter used by the serializer. The converter could possibly be as simple as:

public class ValueToStringConverter : JsonConverter
{
	public override bool CanRead => false;
	
	public override bool CanConvert(Type objectType) => objectType.IsValueType;
	
	public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
		=> throw new NotSupportedException();
	
	public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
	{
		var str = value?.ToString();
		writer.WriteValue(str);
	}
}

Note that in this case the converter does not need to convert a string back to the original value type when deserializing/reading back the json data, hence why this converter sets CanRead to false. Newtonsoft.Json is flexible enough to convert a json string value to the respective value type all by itself.

dotnetfiddle demo: https://dotnetfiddle.net/MLeHLq

[DotNetNext]

This is inconvenient, and the most basic functionality is not built-in

[JHeLiu]

He likes to configure this
opts.SerializerSettings.IsLongToString = true;
^_^