添加环境检测和单exe打包功能

1. 添加.NET Framework 4.8环境检测
   - 启动时检查注册表确认运行环境
   - 缺失时显示明确错误信息和下载链接

2. 配置单exe打包方案
   - 使用ILRepack合并依赖项
   - 更改输出文件名为ExcelMerger_merged.exe
   - 添加必要的项目配置

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

WinFormsApp1/Program.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Windows.Forms;
+using Microsoft.Win32;
 
 namespace WinFormsApp1
 {
@@ -11,9 +12,49 @@ namespace WinFormsApp1
         [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;
+        }
     }
 }

WinFormsApp1/WinFormsApp1.csproj

@@ -4,10 +4,34 @@
     <OutputType>WinExe</OutputType>
     <TargetFramework>net48</TargetFramework>
     <UseWindowsForms>true</UseWindowsForms>
+    <AssemblyName>ExcelMerger</AssemblyName>
+    <RootNamespace>ExcelMerger</RootNamespace>
+    <ApplicationIcon>app.ico</ApplicationIcon>
+    <Win32Resource />
+    <!-- 用于单文件发布的配置 -->
+    <PublishSingleFile>false</PublishSingleFile>
+    <SelfContained>false</SelfContained>
+    <PublishReadyToRun>true</PublishReadyToRun>
+    <!-- 强制将所有依赖项合并到输出目录 -->
+    <CopyLocalLockFileAssemblies>true</CopyLocalLockFileAssemblies>
   </PropertyGroup>
 
   <ItemGroup>
     <PackageReference Include="EPPlus" Version="4.5.3.3" />
+    <!-- 用于ILMerge合并依赖项 -->
+    <PackageReference Include="ILRepack" Version="2.0.18" />
   </ItemGroup>
 
+  <!-- ILMerge后处理脚本 -->
+  <Target Name="ILRepack" AfterTargets="Build">
+    <ItemGroup>
+      <InputAssemblies Include="$(OutputPath)$(AssemblyName).exe" />
+      <InputAssemblies Include="$(OutputPath)EPPlus.dll" />
+      <InputAssemblies Include="$(OutputPath)System.Threading.Tasks.dll" />
+    </ItemGroup>
+    <Message Text="ILRepack merging..." Importance="high" />
+    <Exec Command="$(PkgILRepack)\tools\ILRepack.exe /out:$(OutputPath)$(AssemblyName)_merged.exe @(InputAssemblies-&gt;'%(FullPath)', ' ')" />
+    <Message Text="ILRepack merge complete: $(OutputPath)$(AssemblyName)_merged.exe" Importance="high" />
+  </Target>
+
 </Project>