Initial commit

ConsoleApp1/ConsoleApp1.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

ConsoleApp1/ConsoleApp1.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.14.36414.22 d17.14
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ConsoleApp1", "ConsoleApp1.csproj", "{4D902D3C-86A5-4DD5-8AE9-84B19F6542A6}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{4D902D3C-86A5-4DD5-8AE9-84B19F6542A6}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{4D902D3C-86A5-4DD5-8AE9-84B19F6542A6}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{4D902D3C-86A5-4DD5-8AE9-84B19F6542A6}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{4D902D3C-86A5-4DD5-8AE9-84B19F6542A6}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {731D6895-D6F9-44F2-A02A-0AADDBA06F81}
+	EndGlobalSection
+EndGlobal

ConsoleApp1/HelloWorld.cs

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+using System;
+namespace ConsoleApp1
+{
+    class HelloWorld
+    {
+        static void Main()
+        {
+            char ch=Console.ReadKey();
+            if (Char.ToUpper(ch)<= 'A' && Char.ToUpper(ch)<='Z')
+            {
+                if (ch >= 'A' && ch <= 'Z')
+                {
+                    Console.WriteLine("{0}是大写字母", ch);
+                }
+                else
+                {
+                    Console.WriteLine("{0}是小写字母", ch);
+                }
+            }
+            else if ()
+        }
+    }
+}

ConsoleApp1/Properties/launchSettings.json

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+{
+  "profiles": {
+    "ConsoleApp1": {
+      "commandName": "Project"
+    },
+    "WSL": {
+      "commandName": "WSL2",
+      "distributionName": ""
+    }
+  }
+}