无论是修改注册表方式（System\ControlSet001\Control\Session Manager\Environment"），还是用Environment.SetEnvironmentVariable() 方法，其实最后只差一步。通知。
否则，只能重启操作系统生效。
网上一般这样调用的
SendMessageTimeout(
new IntPtr(HWND_BROADCAST),
WM_SETTINGCHANGE,
IntPtr.Zero,
IntPtr.Zero,
SendMessageTimeoutFlags.SMTO_NORMAL,
,
out result1);
超时不说，还无效。
是这样调用的。
SendMessageTimeout(HWND_BROADCAST, WM_SETTINGCHANGE, IntPtr.Zero, "Environment", SMTO_ABORTIFHUNG, , IntPtr.Zero);
注意那个参数："Environment"。
using System;
using System.Runtime.InteropServices; namespace UsualLib
{
public class NotifyOS
{
// SendMessageTimeout tools
[Flags]
public enum SendMessageTimeoutFlags : uint
{
SMTO_NORMAL = 0x0000,
SMTO_BLOCK = 0x0001,
SMTO_ABORTIFHUNG = 0x0002,
SMTO_NOTIMEOUTIFNOTHUNG = 0x0008
}
const int WM_SETTINGCHANGE = 0x001A;
const int HWND_BROADCAST = 0xffff; [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]
public static extern IntPtr SendMessageTimeout(
IntPtr windowHandle,
uint Msg,
IntPtr wParam,
string lParam,
SendMessageTimeoutFlags flags,
uint timeout,
out IntPtr result
); public static void NotifyOS1()
{
IntPtr result1;
//修改后发送一个消息给系统
//调用
SendMessageTimeout(
new IntPtr(HWND_BROADCAST),
WM_SETTINGCHANGE,
IntPtr.Zero,
"Environment",
SendMessageTimeoutFlags.SMTO_ABORTIFHUNG,
,
out result1);
}
}
}
最后，正常生效了。
写个设置JDK、ANDROID SDK的小工具，可闹腾了些天。