C# 中括号【】放变量前面什么意思.

C# 中括号【】放变量前面什么意思.
[SerializeField]
Texture2D[] taskBotTex;
上面的 [SerializeField]是什么语法,
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[SerializeField]
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using System;
namespace UnityEngine
{
public sealed class SerializeField :Attribute
{
public SerializeField();
}
}