72 lines
2.0 KiB
Markdown
72 lines
2.0 KiB
Markdown
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#unity/日常积累
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UnityEngine命名空间下的Json解析API，**JsonUtility**类。这个得用法应该和LitJson.dll中差不多，具体没用深入研究，应该算是简略版的Litjson，一般开发使用够用了。
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今天使用的时候发现了一些问题，记录一下，防止以后遇到还踩坑。
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``` cs
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using System.Collections;
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using System.Collections.Generic;
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using UnityEngine;
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using System.Text;
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using System;
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public class JsonTools : MonoBehaviour
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{
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// Start is called before the first frame update
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void Start()
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{
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TextAsset json = Resources.Load<TextAsset>("PanelMessageInfo");
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MessageStructRoot pm = JsonUtility.FromJson<MessageStructRoot>(json.text);
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Debug.Log(pm.MessageList[0].picturePath + "====================>" + pm.MessageList[1].zhengwen);
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}
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// Update is called once per frame
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void Update()
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{
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}
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}
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[Serializable]
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public class SetMessageStruct
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{
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/// <summary>
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///
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/// </summary>
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public string zhengwen;
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/// <summary>
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///
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/// </summary>
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public string picturePath;
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}
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[Serializable]
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public class MessageStructRoot
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{
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public List<SetMessageStruct> MessageList ;
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}
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```
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打印输出
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```
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{
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"MessageList": [
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{ "zhengwen":"John" , "picturePath":"D/Doe" },
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{ "zhengwen":"Anna" , "picturePath":"D/Smith" },
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{ "zhengwen":"Peter" , "picturePath":"D/Jones" }
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]
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}
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```
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```
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主要问题就出在这个[Serializable]，之前使用LitJson时，我要是没记错的话是不需要加这个，序列化标签的，但是使用JsonUtility.FromJson（）进行解析，如果不加[Serializable]，无法解析出List<T>，也就是Json中[...]中的内容。
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会报NullReferenceException: Object reference not set to an instance of an object
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JsonTools.Start () (at Assets/Scripts/JsonTools/JsonTools.cs:15)
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错误，即无法解析出List<T>，打断点也可看到，MessageStructRoot pm = JsonUtility.FromJson<MessageStructRoot>(json.text);解析完成后，pm中只有一个为null的MessageList。
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```
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