添加项目文件。

Spider.sln

+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 15
+VisualStudioVersion = 15.0.28307.271
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Spider", "Spider\Spider.csproj", "{1B42AFFB-58B2-4836-AB32-0A5531090513}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{1B42AFFB-58B2-4836-AB32-0A5531090513}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{1B42AFFB-58B2-4836-AB32-0A5531090513}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{1B42AFFB-58B2-4836-AB32-0A5531090513}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{1B42AFFB-58B2-4836-AB32-0A5531090513}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {AEB6AF8B-7469-46D9-BA6E-1CE48861F949}
+	EndGlobalSection
+EndGlobal

Spider/Program.cs

+using System;
+
+namespace Spider
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            Console.WriteLine("Hello World!");
+        }
+    }
+}

Spider/Spider.csproj

+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp2.2</TargetFramework>
+  </PropertyGroup>
+
+</Project>