cfc/cfc-desktop-pet/src/XafPet.Desktop/SingleInstanceHelper.cs

using System.IO;
using System.Runtime.InteropServices;

namespace XafPet.Desktop;

/// <summary>简单的单实例检测（按进程名匹配）</summary>
public static class SingleInstanceHelper
{
    [DllImport("user32.dll")]
    private static extern bool SetForegroundWindow(IntPtr hWnd);

    public static bool TryEnterFirstInstance()
    {
        var name = System.Diagnostics.Process.GetCurrentProcess().ProcessName;
        var instances = System.Diagnostics.Process.GetProcessesByName(name);
        if (instances.Length > 1)
        {
            SetForegroundWindow(instances[0].MainWindowHandle);
            return false;
        }
        return true;
    }
}