c# – 结构的默认参数

public static void ShowAbout(Point location = new Point(),bool reflectionOnly = false)

从C#4规范,第10.6.1节：

The expression in a default-argument
must be one of the following:

• a constant-expression
• an expression of the form new S() where S is a value type
• an expression of the form default(S) where S is a value type

所以你也可以使用：

public static void ShowAbout(Point location = default(Point),bool reflectionOnly = false)

编辑：如果你想默认一个值(0,0),值得了解另一个技巧：

public static void ShowAbout(Point? location = null
    bool stripSystemAssemblies = false,bool reflectionOnly = false)
{
    // Default to point (1,1) instead.
    Point realLocation = location ?? new Point(1,1);
    ...
}

这也将让调用者明确地说,“通过传入null”来选择默认值.