page sample

PacticeSolution/StringBuilderTest/Program.cs

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+using System.Diagnostics;
+using System.Text;
+
+namespace StringBuilderTest
+{
+    internal class Program
+    {
+        static void Main(string[] args)
+        {
+            int cnt = 100000;
+            Stopwatch sw = new Stopwatch();
+
+            Console.WriteLine("Test1\tString");
+            sw.Start();
+            
+            string s = "";
+            for (int i = 0; i < cnt; i++)
+            {
+                s += i;
+            }
+
+            sw.Stop();
+            Console.WriteLine($"Elapsed: {sw.ElapsedMilliseconds}ms");
+
+            Console.WriteLine("Test2\tStringBuilder");
+            sw.Restart();
+            StringBuilder sb = new StringBuilder();
+            for (int i = 0; i < cnt; i++)
+            {
+                sb.Append(i);
+            }
+
+            sw.Stop();
+            Console.WriteLine($"Elapsed: {sw.ElapsedMilliseconds}ms");
+        }
+    }
+}

PacticeSolution/StringBuilderTest/StringBuilderTest.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>