我想将基础类实例列表中的信息投影到派生类实例列表中,但我一直在投入转换异常。这是我想要做的一个例子...我如何使它工作?C#和基础派生类Casting
以下代码在http://ideone.com/CaXQS,如果有帮助...提前致谢!
using System;
using System.Collections.Generic;
namespace AddingReversedNumbers
{
public class MyDerivedClass : MyBaseClass, IMyInterface
{
public int InterfaceProperty { get; set; }
public int DerivedClassProperty { get; set; }
public List<int> DerivedClassList { get; set; }
}
public class MyBaseClass
{
public int BaseClassProperty { get; set; }
}
public interface IMyInterface
{
int InterfaceProperty { get; set; }
}
class Program
{
static void Main()
{
//// This code works just fine.
//var derivedList = new List<MyDerivedClass>();
//derivedList.Add(new MyDerivedClass { BaseClassProperty = 10, DerivedClassProperty = 20, InterfaceProperty = 30 });
//derivedList.Add(new MyDerivedClass { BaseClassProperty = 20, DerivedClassProperty = 40, InterfaceProperty = 60 });
//var baseList = derivedList.ConvertAll(x => (MyBaseClass)x);
// This code breaks when ConvertAll() is called.
var baseList = new List<MyBaseClass>();
baseList.Add(new MyBaseClass{ BaseClassProperty = 10 });
baseList.Add(new MyBaseClass{ BaseClassProperty = 20 });
var derivedList = baseList.ConvertAll(x => (MyDerivedClass)x);
}
}
}
内的项目'baseList'的类型MyDerivedClass'的'没有,所以演员总是失败......你究竟想完成什么? – 2012-08-10 19:52:12
我认为这更好地描述为'上传'。是否有理由不直接将DerivedClass的实例添加到列表? –
mclark1129
2012-08-10 19:53:05
对于列表中的每个项目,我想使用MyBaseClass中的所有信息填充MyDerivedClass的一个新实例。 – 2012-08-10 19:53:34