添加Lesson5

C#进阶/Lesson5_泛型练习/Lesson5_泛型练习.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>

C#进阶/Lesson5_泛型练习/Program.cs

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+namespace Lesson5_泛型练习
+{
+    internal class Program
+    {
+        static void Main(string[] args)
+        {
+            Console.WriteLine("Hello, World!");
+            Console.WriteLine(InputType<int>());
+            Console.WriteLine(InputType<float>());
+            Console.WriteLine(InputType<double>());
+            Console.WriteLine(InputType<string>());
+            Console.WriteLine(InputType<decimal>());
+
+        }
+        public static string InputType<T>()
+        {
+            if (typeof(T) == typeof(int))
+            {
+                return string.Format("{0},{1}字节", "整形", sizeof(int));
+            }else if (typeof(T) == typeof(float))
+            {
+                return string.Format("{0},{1}字节", "单精度浮点数", sizeof(float));
+            }else if (typeof(T) == typeof(double))
+            {
+                return string.Format("{0},{1}字节", "双精度浮点数", sizeof(double));
+            }else if (typeof(T) == typeof(string))
+            {
+                return string.Format("{0},{1}字节", "字符串", "不定长");
+            }
+            return "其他类型";
+        }
+    }
+}