c#如何显式实现接口成员
作者：olprod
这篇文章主要介绍了c#如何显式实现接口成员，帮助大家更好的利用c#处理接口，感兴趣的朋友可以了解下
本示例声明一个接口IDimensions 和一个类 Box，显式实现了接口成员 GetLength 和 GetWidth。 通过接口实例 dimensions 访问这些成员。
interface IDimensions
{
float GetLength();
float GetWidth();
}
class Box : IDimensions
{
float lengthInches;
float widthInches;
Box(float length, float width)
{
lengthInches = length;
widthInches = width;
}
// Explicit interface member implementation:
float IDimensions.GetLength()
{
return lengthInches;
}
// Explicit interface member implementation:
float IDimensions.GetWidth()
{
return widthInches;
}
static void Main()
{
// Declare a class instance box1:
Box box1 = new Box(30.0f, 20.0f);
// Declare an interface instance dimensions:
IDimensions dimensions = box1;
// The following commented lines would produce compilation
// errors because they try to access an explicitly implemented
// interface member from a class instance:
//System.Console.WriteLine("Length: {0}", box1.GetLength());
//System.Console.WriteLine("Width: {0}", box1.GetWidth());
// Print out the dimensions of the box by calling the methods
// from an instance of the interface:
System.Console.WriteLine("Length: {0}", dimensions.GetLength());
System.Console.WriteLine("Width: {0}", dimensions.GetWidth());
}
}
/* Output:
Length: 30
Width: 20
*/
可靠编程
- 请注意，注释掉了
Main方法中以下行，因为它们将产生编译错误。 显式实现的接口成员不能从类实例访问：
//System.Console.WriteLine("Length: {0}", box1.GetLength());
//System.Console.WriteLine("Width: {0}", box1.GetWidth());
- 另请注意
Main方法中的以下行成功输出了框的尺寸，因为这些方法是从接口实例调用的：
System.Console.WriteLine("Length: {0}", dimensions.GetLength());
System.Console.WriteLine("Width: {0}", dimensions.GetWidth());
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