72 lines
2.0 KiB
Markdown
72 lines
2.0 KiB
Markdown
#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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``` |