Csharp/CSharp Tutorial/Language Basics/Namespace Alias

Aliasing Class Names

<source lang="csharp">using Class1 = Namespace1.TestClass; using Class2 = Namespace2.TestClass;

namespace Namespace1 {

   class TestClass
   {
       public TestClass()
       {
           System.Console.WriteLine("Hello from Namespace1.TestClass!");
       }
   }

}

namespace Namespace2 {

   class TestClass
   {
       public TestClass()
       {
           System.Console.WriteLine("Hello from Namespace2.TestClass!");
       }
   }

}

class MainClass {

   public static void Main()
   {
       Class1 Object1 = new Class1();
       Class2 Object2 = new Class2();
   }

}</source>

Aliasing Namespace Names

<source lang="csharp">using N1 = Namespace1; using N2 = Namespace2;

namespace Namespace1 {

   class TestClass
   {
       public TestClass()
       {
           System.Console.WriteLine("Hello from Namespace1.TestClass!");
       }
   }

}

namespace Namespace2 {

   class TestClass
   {
       public TestClass()
       {
           System.Console.WriteLine("Hello from Namespace2.TestClass!");
       }
   }

}

class MainClass {

   public static void Main()
   {
       N1.TestClass Object1 = new N1.TestClass();
       N2.TestClass Object2 = new N2.TestClass();
   }

}</source>

Global Namespace Alias

<source lang="csharp">using System; using System.Collections.Generic; using System.Text; using System.ruponentModel; class Configuration {} namespace My {

   class Configuration {}
   class GlobalNamespaceAlias
   {
       static void Main()
       {
           Console.WriteLine(typeof(Configuration));
           Console.WriteLine(typeof(global::Configuration));
           Console.WriteLine(typeof(global::My.GlobalNamespaceAlias));
       }
   }

}</source>

Simple Aliases for namespace

<source lang="csharp">using System; using WinForms = System.Windows.Forms; using WebForms = System.Web.UI.WebControls; using System.ruponentModel;

   class SimpleAliases
   {        
       static void Main()
       {
           Console.WriteLine (typeof (WinForms.Button));
           Console.WriteLine (typeof (WebForms.Button));
       }
   }</source>

Use the global alias.

<source lang="csharp">using System;

using Ctr = Counter;

namespace Counter {

 class MyClass {  
 }  

}

// Declare another class called CountDown, which // is in the global namespace. class MyClass { }

class GlobalAliasQualifierDemo {

 public static void Main() {  

   Ctr::MyClass m = new Ctr::MyClass();  

   // Next, create CountDown object from global namespace. 
   global::MyClass m2 = new global::MyClass();  
 }  

}</source>

Using a Namespace Directive

<source lang="csharp">using System;

using Class1 = Namespace1.TestClass; using Class2 = Namespace2.TestClass;

namespace Namespace1 {

   class TestClass
   {
       public TestClass()
       {
           Console.WriteLine("Hello from Namespace1.TestClass!");
       }
   }

}

namespace Namespace2 {

   class TestClass
   {
       public TestClass()
       {
           Console.WriteLine("Hello from Namespace2.TestClass!");
       }
   }

}

class MainClass {

   public static void Main()
   {
       Class1 Object1 = new Class1();
       Class2 Object2 = new Class2();
   }

}</source>

Using the alias keyword to refer to a nested namespace.

<source lang="csharp">using CmpDb = Company.InternalClasses.Database.Table; namespace Company.InternalClasses {

   public class DBInterface {
       public static void Open() {
           System.Console.WriteLine("Opening database");
       }
   }
   // Define a nested namespace within InternalClasses
   namespace Database {
       public class Table {
           public static void Open(string tblName) {
               System.Console.WriteLine("Opening table {0}", tblName);
           }
       }
   }

} public class MainClass {

   public static void Main() {
       CmpDb.Open("fred");
   }

}</source>