C＃自定義對象無效轉換

Question

我想投我的目標如下圖所示：

public interface IObjectComparison 
{ 
    object GetPropertyValue(string property); 

} 

public class MyObject : IObjectComparison 
{ 
    public object GetPropertyValue(string property) 
    { 
     ... 
     return (object)...; 
    } 
} 

然後

MyObject mo = new MyObject(); 
IObjectComparison imo = (IObjectComparison) mo; 

當從MyObject鑄造IObjectComparison，我發現了一個InvalidCastException的 。爲什麼？

感謝您的幫助

Answer 1

你不需要在all.Just使用拈：

MyObject mo = new MyObject(); 
IObjectComparison imo = mo; 

Answer 2

此代碼工作正常：

public interface IObjectComparison 
{ 
    object GetPropertyValue(string property); 
} 

public class MyObject : IObjectComparison 
{ 
    public object GetPropertyValue(string property) 
    { 
     return new object(); 
    } 
} 

class Program 
{ 
    static void Main() 
    { 
     MyObject mo = new MyObject(); 
     IObjectComparison imo = (IObjectComparison)mo; 
    } 

}