显式接口实现还允许程序员实现具有相同成员名称的两个接口，并为每个接口成员各提供一个单独的实现。 本示例同时以公制单位和英制单位显示框的尺寸。 Box 类实现 IEnglishDimensions 和 IMetricDimensions 两个接口，它们表示不同的度量系统。 两个接口有相同的成员名称 Length 和 Width。
示例
// Declare the English units interface:
interface IEnglishDimensions
{float Length();float Width();
}// Declare the metric units interface:
interface IMetricDimensions
{float Length();float Width();
}// Declare the Box class that implements the two interfaces:
// IEnglishDimensions and IMetricDimensions:
class Box : IEnglishDimensions, IMetricDimensions
{float lengthInches;float widthInches;public Box(float lengthInches, float widthInches){this.lengthInches = lengthInches;this.widthInches = widthInches;}// Explicitly implement the members of IEnglishDimensions:float IEnglishDimensions.Length() => lengthInches;float IEnglishDimensions.Width() => widthInches;// Explicitly implement the members of IMetricDimensions:float IMetricDimensions.Length() => lengthInches * 2.54f;float IMetricDimensions.Width() => widthInches * 2.54f;static void Main(){// Declare a class instance box1:Box box1 = new Box(30.0f, 20.0f);// Declare an instance of the English units interface:IEnglishDimensions eDimensions = box1;// Declare an instance of the metric units interface:IMetricDimensions mDimensions = box1;// Print dimensions in English units:System.Console.WriteLine("Length(in): {0}", eDimensions.Length());System.Console.WriteLine("Width (in): {0}", eDimensions.Width());// Print dimensions in metric units:System.Console.WriteLine("Length(cm): {0}", mDimensions.Length());System.Console.WriteLine("Width (cm): {0}", mDimensions.Width());}
}
/* Output:Length(in): 30Width (in): 20Length(cm): 76.2Width (cm): 50.8
*/可靠编程
如果希望默认度量采用英制单位，请正常实现 Length 和 Width 方法，并从 IMetricDimensions 接口显式实现 Length 和 Width 方法：
// Normal implementation:
public float Length() => lengthInches;
public float Width() => widthInches;// Explicit implementation:
float IMetricDimensions.Length() => lengthInches * 2.54f;
float IMetricDimensions.Width() => widthInches * 2.54f;这种情况下，可以从类实例访问英制单位，从接口实例访问公制单位：
public static void Test()
{Box box1 = new Box(30.0f, 20.0f);IMetricDimensions mDimensions = box1;System.Console.WriteLine("Length(in): {0}", box1.Length());System.Console.WriteLine("Width (in): {0}", box1.Width());System.Console.WriteLine("Length(cm): {0}", mDimensions.Length());System.Console.WriteLine("Width (cm): {0}", mDimensions.Width());
}