Optional parameters in C#

gpeipman
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Optional parameters

C# supports optional parameters when working with methods. Optional are parameters that have default value specified like shown in the following example. It is convenient way to write methods that have default values specified for their arguments.

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using System;
class Hello
{
static void Main()
{
Console.WriteLine(SomeMethod());
Console.WriteLine(SomeMethod(null) ?? "<null>");
Console.WriteLine(SomeMethod("specified value"));
}
static string SomeMethod(string s1 = "default value")
{
return s1;
}
}
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Optional parameters must be the last ones in method arguments list.

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