C#: Namespace aliases

'using' keyword is used to define aliases.

Syntax

using aliasName = namespaceDeclaration;

Example

namespace NameSpace1

{

    namespace NameSpace2

    {

        namespace NameSpace3

        {

            namespace NameSpace4

            {

                class Arithmetic

                {

                    public static int sum(int a, int b)

                    {

                        return a + b;

                    }

                }

            }

        }

    }

}

To access the method sum of the class ‘Arithmetic’, you need to call the following statement.

int result1 = NameSpace1.NameSpace2.NameSpace3.NameSpace4.Arithmetic.sum(10, 20);

Notify the above statements, it requires more typing to call the method sum. By using name space aliases, we can solve this problem very easily.

Following statement define an alias.

using sumAlias = NameSpace1.NameSpace2.NameSpace3.NameSpace4.Arithmetic;

You can call the method 'sum' like below.

int result1 = sumAlias.sum(10, 20);

Following is the complete working application.

Program.cs

using System;

using sumAlias = NameSpace1.NameSpace2.NameSpace3.NameSpace4.Arithmetic;

namespace NameSpace1
{
    namespace NameSpace2
    {
        namespace NameSpace3
        {
            namespace NameSpace4
            {
                class Arithmetic
                {
                    public static int sum(int a, int b)
                    {
                        return a + b;
                    }
                }
            }
        }
    }
}

class Program
{
    static void Main(string[] args)
    {
        int result1 = sumAlias.sum(10, 20);
        Console.WriteLine("Sum of 10 and 20 is {0}", result1);
    }

}

Output

Sum of 10 and 20 is 30

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