diff --git a/.vscode/launch.json b/.vscode/launch.json
new file mode 100644
index 0000000..71cf075
--- /dev/null
+++ b/.vscode/launch.json
@@ -0,0 +1,27 @@
+{
+    "version": "0.2.0",
+    "configurations": [
+    
+        {
+            // Use IntelliSense to find out which attributes exist for C# debugging
+            // Use hover for the description of the existing attributes
+            // For further information visit https://github.com/OmniSharp/omnisharp-vscode/blob/master/debugger-launchjson.md
+            "name": ".NET Core Launch (console)",
+            "type": "coreclr",
+            "request": "launch",
+            "preLaunchTask": "build",
+            // If you have changed target frameworks, make sure to update the program path.
+            "program": "${workspaceFolder}/Sanchime.Test/bin/Debug/net7.0/Sanchime.Test.dll",
+            "args": [],
+            "cwd": "${workspaceFolder}/Sanchime.Test",
+            // For more information about the 'console' field, see https://aka.ms/VSCode-CS-LaunchJson-Console
+            "console": "internalConsole",
+            "stopAtEntry": false
+        },
+        {
+            "name": ".NET Core Attach",
+            "type": "coreclr",
+            "request": "attach"
+        }
+    ]
+}
\ No newline at end of file
diff --git a/.vscode/tasks.json b/.vscode/tasks.json
new file mode 100644
index 0000000..308a063
--- /dev/null
+++ b/.vscode/tasks.json
@@ -0,0 +1,41 @@
+{
+    "version": "2.0.0",
+    "tasks": [
+        {
+            "label": "build",
+            "command": "dotnet",
+            "type": "process",
+            "args": [
+                "build",
+                "${workspaceFolder}/Sanchime.Test/Sanchime.Test.csproj",
+                "/property:GenerateFullPaths=true",
+                "/consoleloggerparameters:NoSummary"
+            ],
+            "problemMatcher": "$msCompile"
+        },
+        {
+            "label": "publish",
+            "command": "dotnet",
+            "type": "process",
+            "args": [
+                "publish",
+                "${workspaceFolder}/Sanchime.Test/Sanchime.Test.csproj",
+                "/property:GenerateFullPaths=true",
+                "/consoleloggerparameters:NoSummary"
+            ],
+            "problemMatcher": "$msCompile"
+        },
+        {
+            "label": "watch",
+            "command": "dotnet",
+            "type": "process",
+            "args": [
+                "watch",
+                "run",
+                "--project",
+                "${workspaceFolder}/Sanchime.Test/Sanchime.Test.csproj"
+            ],
+            "problemMatcher": "$msCompile"
+        }
+    ]
+}
\ No newline at end of file
diff --git a/Sanchime.Functional/Extensions/Exceptional.cs b/Sanchime.Functional/Extensions/Exceptional.cs
index 46dcabb..41a9b06 100644
--- a/Sanchime.Functional/Extensions/Exceptional.cs
+++ b/Sanchime.Functional/Extensions/Exceptional.cs
@@ -54,4 +54,31 @@ public static class ExceptionalException
         => @this.Map(CurryingExtension.CurryFirst).Apply(value);
     #endregion
 
+
+    #region 单子
+
+    public static Exceptional<R> Bind<T, R>(this Exceptional<T> @this, Func<T, Exceptional<R>> binding)
+        => @this.Successful ? binding(@this.Value) : new Exceptional<R>(@this.Exception);
+
+    #endregion
+
+    public static Exceptional<Unit> ForEach<T>(this Exceptional<T> @this, Action<T> action)
+        => @this.Map(action.ToFunc());
+
+    #region Linq
+
+    public static Exceptional<R> Select<T, R>(this Exceptional<T> @this, Func<T, R> mapping)
+        => @this.Map(mapping);
+
+    public static Exceptional<RR> SelectMany<T, R, RR>(this Exceptional<T> @this, Func<T, Exceptional<R>> binding, Func<T, R, RR> project)
+    {
+        if (@this.Exceptionally)
+        {
+            return new Exceptional<RR>(@this.Exception);
+        }
+        var bound = binding(@this.Value);
+        return bound.Exceptionally ? new Exceptional<RR>(bound.Exception) : project(@this.Value, bound.Value);
+    }
+
+    #endregion
 }
diff --git a/Sanchime.Test/Program.cs b/Sanchime.Test/Program.cs
index 342b628..e76d641 100644
--- a/Sanchime.Test/Program.cs
+++ b/Sanchime.Test/Program.cs
@@ -1,5 +1,5 @@
-using Sanchime.Functional.Core.Products;
-using Sanchime.Functional.Core.Extensions;
+using Sanchime.Functional.Products;
+using Sanchime.Functional.Extensions;
 using Sanchime.Toolkits;
 
 // Test<int> test = new Test<int>();
@@ -19,15 +19,15 @@ using Sanchime.Toolkits;
 
 // Option.Some(1).Map(x => (float)x + 1.2).Map(x => x.ToString()).Map(x => x.GetType().Name).WriteLine();
 
-// // 测试Option的Bind
-// var parse = (string s) => Int32.TryParse(s, out int i) ? Option.Some(i) : Option.None;
-// var foo = (string s) => s.Pipe(parse).Bind(Age.Of);
+// 测试Option的Bind
+var parse = (string s) => Int32.TryParse(s, out int i) ? Option.Some(i) : Option.None;
+var foo = (string s) => s.Pipe(parse).Bind(Age.Of);
  
-// foo("111").WriteLine();
-// foo("aaa").WriteLine();
-// foo("123").WriteLine();
-// // 管道
-// foo("1ab").Pipe(x => Console.WriteLine(x));
+foo("111").WriteLine();
+foo("aaa").WriteLine();
+foo("123").WriteLine();
+// 管道
+foo("1ab").Pipe(x => Console.WriteLine(x));
 public struct Age
 {
     private int _value;
diff --git a/Sanchime.Toolkits/Basic.cs b/Sanchime.Toolkits/Basic.cs
index c0e4805..2c12695 100644
--- a/Sanchime.Toolkits/Basic.cs
+++ b/Sanchime.Toolkits/Basic.cs
@@ -1,3 +1,4 @@
+using System.Diagnostics;
 namespace Sanchime.Toolkits;
 
 public static class Basic
@@ -5,7 +6,7 @@ public static class Basic
 
     public static void WriteLine<T>(this T @this)
     {
-        System.Console.WriteLine(@this);
+        Debug.WriteLine(@this);
     }
 
     public static void WriteLine<T>(this T @this, Func<T, T> func)