1. Problem description
When using the Utility.Json.ToObject(string json) method of the UGF framework, it is obviously the DefaultJsonHelper class that implements the IJsonHelper interface. Why is it that the method in the DefaultJsonHelper is executed when the Utility.Json.ToObject(string json) method is called.
2. Analysis
Looking at the source code of the UGF framework shows:
//------------------------------------------------------------
// Game Framework
// Copyright © 2013-2021 Jiang Yin. All rights reserved.
// Homepage: https://gameframework.cn/
// Feedback: mailto:[email protected]
//------------------------------------------------------------
using System;
namespace GameFramework
{
public static partial class Utility
{
/// <summary>
/// JSON 相关的实用函数。
/// </summary>
public static partial class Json
{
private static IJsonHelper s_JsonHelper = null;
/// <summary>
/// 设置 JSON 辅助器。
/// </summary>
/// <param name="jsonHelper">要设置的 JSON 辅助器。</param>
public static void SetJsonHelper(IJsonHelper jsonHelper)
{
s_JsonHelper = jsonHelper;
}
/// <summary>
/// 将对象序列化为 JSON 字符串。
/// </summary>
/// <param name="obj">要序列化的对象。</param>
/// <returns>序列化后的 JSON 字符串。</returns>
public static string ToJson(object obj)
{
if (s_JsonHelper == null)
{
throw new GameFrameworkException("JSON helper is invalid.");
}
try
{
return s_JsonHelper.ToJson(obj);
}
catch (Exception exception)
{
if (exception is GameFrameworkException)
{
throw;
}
throw new GameFrameworkException(Text.Format("Can not convert to JSON with exception '{0}'.", exception), exception);
}
}
/// <summary>
/// 将 JSON 字符串反序列化为对象。
/// </summary>
/// <typeparam name="T">对象类型。</typeparam>
/// <param name="json">要反序列化的 JSON 字符串。</param>
/// <returns>反序列化后的对象。</returns>
public static T ToObject<T>(string json)
{
if (s_JsonHelper == null)
{
throw new GameFrameworkException("JSON helper is invalid.");
}
try
{
return s_JsonHelper.ToObject<T>(json);
}
catch (Exception exception)
{
if (exception is GameFrameworkException)
{
throw;
}
throw new GameFrameworkException(Text.Format("Can not convert to object with exception '{0}'.", exception), exception);
}
}
/// <summary>
/// 将 JSON 字符串反序列化为对象。
/// </summary>
/// <param name="objectType">对象类型。</param>
/// <param name="json">要反序列化的 JSON 字符串。</param>
/// <returns>反序列化后的对象。</returns>
public static object ToObject(Type objectType, string json)
{
if (s_JsonHelper == null)
{
throw new GameFrameworkException("JSON helper is invalid.");
}
if (objectType == null)
{
throw new GameFrameworkException("Object type is invalid.");
}
try
{
return s_JsonHelper.ToObject(objectType, json);
}
catch (Exception exception)
{
if (exception is GameFrameworkException)
{
throw;
}
throw new GameFrameworkException(Text.Format("Can not convert to object with exception '{0}'.", exception), exception);
}
}
}
}
}