添加项目文件。

Sln.Imm.Daemon.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.10.35122.118
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Sln.Imm.Daemon", "Sln.Imm.Daemon\Sln.Imm.Daemon.csproj", "{682DDE67-2CBF-4B54-831F-987EC6667FD1}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{682DDE67-2CBF-4B54-831F-987EC6667FD1}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{682DDE67-2CBF-4B54-831F-987EC6667FD1}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{682DDE67-2CBF-4B54-831F-987EC6667FD1}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{682DDE67-2CBF-4B54-831F-987EC6667FD1}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {EE619F18-FC43-4707-9489-D336C2F7868D}
+	EndGlobalSection
+EndGlobal

Sln.Imm.Daemon/Program.cs

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+namespace Sln.Imm.Daemon
+{
+    internal class Program
+    {
+        static void Main(string[] args)
+        {
+            Console.WriteLine("Hello, World!");
+        }
+    }
+}

Sln.Imm.Daemon/Sln.Imm.Daemon.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>