C# 只運行一個窗口實例 彈出已打開最小化在任務欄的程序
using System;
using System.Diagnostics;
using System.Reflection;
using System.Runtime.InteropServices;
using System.Windows.Forms;
namespace DataChange
{
static class Program
{
/// <summary>
/// 該函數設置由不同線程產生的窗口的顯示狀態
/// </summary>
/// <param name="hWnd">窗口句柄</param>
/// <param name="cmdShow">指定窗口如何顯示。查看允許值列表,請查閱ShowWlndow函數的說明部分</param>
/// <returns>如果函數原來可見,返回值爲非零;如果函數原來被隱藏,返回值爲零</returns>
[DllImport("User32.dll")]
private static extern bool ShowWindowAsync(IntPtr hWnd, int cmdShow);
/// <summary>
/// 該函數將創建指定窗口的線程設置到前臺,並且激活該窗口。鍵盤輸入轉向該窗口,併爲用戶改各種可視的記號。
/// 系統給創建前臺窗口的線程分配的權限稍高於其他線程。
/// </summary>
/// <param name="hWnd">將被激活並被調入前臺的窗口句柄</param>
/// <returns>如果窗口設入了前臺,返回值爲非零;如果窗口未被設入前臺,返回值爲零</returns>
[DllImport("User32.dll")]
private static extern bool SetForegroundWindow(IntPtr hWnd);
private const int SwShownomal = 1;
/// <summary>
/// 應用程序的主入口點。
/// </summary>
[STAThread]
static void Main()
{
var process = RunningInstance();
if (process != null)
{
HandleRunningInstance(process);
Environment.Exit(1);
}
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new MainForm());
}
/// <summary>
/// 展示實例
/// </summary>
/// <param name="instance"></param>
private static void HandleRunningInstance(Process instance)
{
ShowWindowAsync(instance.MainWindowHandle, SwShownomal); //顯示
SetForegroundWindow(instance.MainWindowHandle); //當到最前端
}
/// <summary>
/// 獲取當前運行的實例
/// </summary>
/// <returns></returns>
public static Process RunningInstance()
{
var currentProcess = Process.GetCurrentProcess();
var processes = Process.GetProcessesByName(currentProcess.ProcessName);
foreach (var process in processes)
{
if (process.Id == currentProcess.Id) continue;
if (Assembly.GetExecutingAssembly().Location.Replace("/", "\\") == currentProcess.MainModule.FileName)
{
return process;
}
}
return null;
}
}
}
using System.Diagnostics;
using System.Reflection;
using System.Runtime.InteropServices;
using System.Windows.Forms;
namespace DataChange
{
static class Program
{
/// <summary>
/// 該函數設置由不同線程產生的窗口的顯示狀態
/// </summary>
/// <param name="hWnd">窗口句柄</param>
/// <param name="cmdShow">指定窗口如何顯示。查看允許值列表,請查閱ShowWlndow函數的說明部分</param>
/// <returns>如果函數原來可見,返回值爲非零;如果函數原來被隱藏,返回值爲零</returns>
[DllImport("User32.dll")]
private static extern bool ShowWindowAsync(IntPtr hWnd, int cmdShow);
/// <summary>
/// 該函數將創建指定窗口的線程設置到前臺,並且激活該窗口。鍵盤輸入轉向該窗口,併爲用戶改各種可視的記號。
/// 系統給創建前臺窗口的線程分配的權限稍高於其他線程。
/// </summary>
/// <param name="hWnd">將被激活並被調入前臺的窗口句柄</param>
/// <returns>如果窗口設入了前臺,返回值爲非零;如果窗口未被設入前臺,返回值爲零</returns>
[DllImport("User32.dll")]
private static extern bool SetForegroundWindow(IntPtr hWnd);
private const int SwShownomal = 1;
/// <summary>
/// 應用程序的主入口點。
/// </summary>
[STAThread]
static void Main()
{
var process = RunningInstance();
if (process != null)
{
HandleRunningInstance(process);
Environment.Exit(1);
}
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new MainForm());
}
/// <summary>
/// 展示實例
/// </summary>
/// <param name="instance"></param>
private static void HandleRunningInstance(Process instance)
{
ShowWindowAsync(instance.MainWindowHandle, SwShownomal); //顯示
SetForegroundWindow(instance.MainWindowHandle); //當到最前端
}
/// <summary>
/// 獲取當前運行的實例
/// </summary>
/// <returns></returns>
public static Process RunningInstance()
{
var currentProcess = Process.GetCurrentProcess();
var processes = Process.GetProcessesByName(currentProcess.ProcessName);
foreach (var process in processes)
{
if (process.Id == currentProcess.Id) continue;
if (Assembly.GetExecutingAssembly().Location.Replace("/", "\\") == currentProcess.MainModule.FileName)
{
return process;
}
}
return null;
}
}
}
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