WinformsApp1/WinFormsApp1/Program.cs

using System;
using System.Windows.Forms;
using Microsoft.Win32;

namespace WinFormsAppTemplate
{
    internal static class Program
    {
        /// <summary>
        ///  The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main()
        {
            // 检查.NET Framework 4.8是否已安装
            if (!CheckDotNetFramework48())
            {
                MessageBox.Show(
                    "检测到您的系统未安装 .NET Framework 4.8\n\n" +
                    "Excel合并工具需要此环境才能运行。\n\n" +
                    "请前往以下链接下载并安装：\n" +
                    "https://dotnet.microsoft.com/download/dotnet-framework/net48\n\n" +
                    "安装完成后请重新运行本程序。",
                    "缺少运行环境",
                    MessageBoxButtons.OK,
                    MessageBoxIcon.Error
                );
                return;
            }

            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new Form1());
        }

        private static bool CheckDotNetFramework48()
        {
            try
            {
                using (RegistryKey key = Registry.LocalMachine.OpenSubKey(@"SOFTWARE\Microsoft\NET Framework Setup\NDP\v4\Full\"))
                {
                    if (key != null)
                    {
                        object release = key.GetValue("Release");
                        if (release != null && int.TryParse(release.ToString(), out int releaseValue))
                        {
                            // .NET Framework 4.8 的 Release 值为 528040 或更高
                            return releaseValue >= 528040;
                        }
                    }
                }
            }
            catch
            {
                // 如果无法访问注册表，假设未安装
            }
            return false;
        }
    }
}