设想这样的一个场景：

你写了一个Unity3d插件，放到Unity Asset Store上面出售，某一天你更新了一个版本，如何让用户知道你更新了呢？

结合目前所有软件的更新检测方案，在Unity中可用的就是监听Unity3d的启动事件检测更新。

好。

我们项目中用到了AstarPath寻路，每次打开工程，都会在Console中打印出检测更新的日志，点进去看到他的源代码如下：

	[InitializeOnLoad]
	/** Checking for updates on startup */
	public static class UpdateChecker {
	    static UpdateChecker()
	    {
			AstarPathEditor.CheckForUpdates ();
	    }
	}

[InitializeOnLoad]

Running Editor Script Code on Launch

Sometimes, it is useful to be able to run some editor script code in a project as soon as Unity launches without requiring action from the user.You can do this by applying the InitializeOnLoad attribute to a class which has a static constructor. A static constructor is a function with the same name as the class, declared static and without a return type or parameters (see here for more information):-

需要静态的构造函数！

下面是官方的例子：

using UnityEngine;
using UnityEditor;

[InitializeOnLoad]
public class Startup {
    static Startup()
    {
        Debug.Log("Up and running");
    }
}

using UnityEditor;
using UnityEngine;

[InitializeOnLoad]
class MyClass
{
    static MyClass ()
    {
        EditorApplication.update += Update;
    }

    static void Update ()
    {
        Debug.Log("Updating");
    }
}

监听Unity3d启动事件 - InitializeOnLoad