一、 问题描述
在使用UGF框架的Utility.Json.ToObject(string json)方法时，实现IJsonHelper接口的明明是DefaultJsonHelper类，为什么调用Utility.Json.ToObject(string json)方法执行的却是DefaultJsonHelper中的方法。
二、分析
查看UGF框架源码可知：
//------------------------------------------------------------
// 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);
}
}
}
}
}