C# using static directive helps us to access static members (methods and fields) of the class without using the class name. If we don?t use static directive, we need to use class name to call static members each time.
It allows us to import static members of a class into the source file. It follows a syntax that is given below.
C# using static directive syntax
Example
using static <fully-qualified-type-name>
In the following example, we are not using static directive . We can see that, to access static method of Math class, class name is used.
C# Example without using static directive
Example
using System;
namespace CSharpFeatures
{
class StaticImport
{
public static void Main(string[] args)
{
double sqrt = Math.Sqrt(144); // Math class is used to access Sqrt() method
string newStr = String.Concat("Hello World",".com");
Console.WriteLine(sqrt);
Console.WriteLine(newStr);
}
}
}
Output
Output
12
hello world.com
In the following example, we are using static directive in the source file. So, it does not require class name before calling the method.
C# Example with using static directive
Example
using System;
using static System.Math; // static directive
using static System.String;
namespace CSharpFeatures
{
class StaticImport
{
public static void Main(string[] args)
{
double sqrt = Sqrt(144); // Calling without class name
string newStr = Concat("Hello World",".com");
Console.WriteLine(sqrt);
Console.WriteLine(newStr);
}
}
}
We can see, it produces the same result even after removing the type from the function call.
Output
Output
12
hello world.com