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Brett Hewitson 2021-01-07 16:23:23 +10:00
parent 5f8fb2c825
commit 7e57b72e35
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107
src/ServerManager.Common/JsonConverters/NullableValueConverter.cs Normal file
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using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using ServerManagerTool.Common.Interfaces;
using ServerManagerTool.Common.Model;
using System;
namespace ServerManagerTool.Common.JsonConverters
{
public class NullableValueConverter<T> : JsonConverter
{
public override bool CanConvert(Type objectType)
{
if (objectType == typeof(NullableValue<int>))
{
return true;
}
else if (objectType == typeof(NullableValue<float>))
{
return true;
}
return false;
}
public override bool CanRead => true;
public override bool CanWrite => true;
public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
{
if (reader.TokenType == JsonToken.Null)
{
// Create target object based on objectType
var target = Activator.CreateInstance(objectType) as INullableValue;
target?.SetValue(existingValue);
return target;
}
if (reader.TokenType == JsonToken.StartObject)
{
// Load JObject from stream
var jObject = JObject.Load(reader);
// Create target object based on objectType
var target = Activator.CreateInstance(objectType);
// Populate the object properties
serializer.Populate(jObject.CreateReader(), target);
return target;
}
if (reader.TokenType == JsonToken.Integer)
{
var jValue = JToken.Load(reader) as JValue;
// Create target object based on objectType
var target = Activator.CreateInstance(objectType) as NullableValue<int>;
target?.SetValue(existingValue);
if (target != null && jValue != null && jValue.Value != null && int.TryParse(jValue.Value.ToString(), out int result))
{
// Populate the object properties
target.SetValue(result);
return target;
}
}
if (reader.TokenType == JsonToken.Float)
{
var jValue = JToken.Load(reader) as JValue;
// Create target object based on objectType
var target = Activator.CreateInstance(objectType) as NullableValue<int>;
target?.SetValue(existingValue);
if (target != null && jValue != null && jValue.Value != null && float.TryParse(jValue.Value.ToString(), out float result))
{
// Populate the object properties
target.SetValue(result);
return target;
}
}
return Activator.CreateInstance(objectType);
}
public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
{
if (value != null && value is NullableValue<int> && ((NullableValue<int>)value).HasValue)
{
serializer.Serialize(writer, ((NullableValue<int>)value).Value);
}
else if (value != null && value is NullableValue<float> && ((NullableValue<float>)value).HasValue)
{
serializer.Serialize(writer, ((NullableValue<float>)value).Value);
}
else
{
serializer.Serialize(writer, null);
}
}
}
}