How Do Optional Parameters Work in C#?

Optional parameters in C#

In earlier versions before C# 4.0, optional parameters were not supported. However, there are techniques to simulate them. One way is to overload the method with a different parameter list. For example:

<code class="language-c#">public void GetFooBar(int a)
{
    // GetFooBar 的单参数实现
}

public void GetFooBar(int a, int b)
{
    // GetFooBar 的双参数实现
}</code>

This allows you to call GetFooBar with one or two arguments, depending on your needs.

However, in C# 4.0 and later, optional parameters are directly supported using the following syntax:

<code class="language-c#">public void GetFooBar(int a, int b = 0)
{
    // GetFooBar 的可选参数实现
}</code>

In this example, if b is not provided when calling the method, it defaults to 0. You can specify any default value you want.

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