C#读取设置path环境变量并重启计算机[转载]

有时候需要修改path系统环境变量， 不多说，代码如下：using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Text;using System.Windows.Forms;using Microsoft.Win32;//注册表操作要引用的空间using System.Runtime.InteropServices;//调用API函数需要的引用，来加载非托管类user32.dllnamespace 用程序修改环境变量{ public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void Form1_Load(object sender, EventArgs e) { } /**////

/// 读取注册表 /// path的路径：[HKEY_LOCAL_MACHINE/SYSTEM/ControlSet001/Control/Session Manager/Environment] ///

/// /// private void tbnRead_Click(object sender, EventArgs e) { RegistryKey regLocalMachine = Registry.LocalMachine; RegistryKey regSYSTEM = regLocalMachine.OpenSubKey("SYSTEM", true);//打开HKEY_LOCAL_MACHINE下的SYSTEM RegistryKey regControlSet001 = regSYSTEM.OpenSubKey("ControlSet001", true);//打开ControlSet001 RegistryKey regControl = regControlSet001.OpenSubKey("Control", true);//打开Control RegistryKey regManager = regControl.OpenSubKey("Session Manager", true);//打开Control RegistryKey regEnvironment = regManager.OpenSubKey("Environment", true);//打开MSSQLServer下的MSSQLServer this.richTextBox1.Text = regEnvironment.GetValue("path").ToString();//读取path的值 } private void btnClose_Click(object sender, EventArgs e) { Close(); } /**////

/// ///

/// /// [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]//SendMessageTimeout是在user32.dll中定义的 public static extern IntPtr SendMessageTimeout( IntPtr windowHandle, uint Msg, IntPtr wParam, IntPtr lParam, SendMessageTimeoutFlags flags, uint timeout, out IntPtr result ); [Flags] public enum SendMessageTimeoutFlags : uint { SMTO_NORMAL = 0x0000, SMTO_BLOCK = 0x0001, SMTO_ABORTIFHUNG = 0x0002, SMTO_NOTIMEOUTIFNOTHUNG = 0x0008 } private void btnWrite_Click(object sender, EventArgs e) { RegistryKey regLocalMachine = Registry.LocalMachine; RegistryKey regSYSTEM = regLocalMachine.OpenSubKey("SYSTEM", true);//打开HKEY_LOCAL_MACHINE下的SYSTEM RegistryKey regControlSet001 = regSYSTEM.OpenSubKey("ControlSet001", true);//打开ControlSet001 RegistryKey regControl = regControlSet001.OpenSubKey("Control", true);//打开Control RegistryKey regManager = regControl.OpenSubKey("Session Manager", true);//打开Control RegistryKey regEnvironment = regManager.OpenSubKey("Environment", true);//打开MSSQLServer下的MSSQLServer regEnvironment.SetValue("path", this.richTextBox1.Text);//读取path的值 MessageBox.Show("修改成功"); //下面利用发送系统消息，就不要重新启动计算机了 const int HWND_BROADCAST=0xffff; // DWORD dwMsgResult = 0L; const uint WM_SETTINGCHANGE = 0; const long SMTO_ABORTIFHUNG = 0x2; System.UInt32 dwMsgResult1=0; long s; // SendMessageTimeout(HWND_BROADCAST, WM_SETTINGCHANGE, 0, (string)"Environment", SMTO_ABORTIFHUNG, 5000,(long)s); } /**////

/// 重新启动计算机 ///

/// /// /// [DllImport("user32.dll")] //主要ＡＰＩ是这个，注意：必须声明为static extern private static extern int ExitWindowsEx(int x, int y); private void button1_Click(object sender, EventArgs e) { ExitWindowsEx(2,0); } }}