强制转换为基础词典 [英] Cast Derived to Base dictionary

问题描述

我有2本字典.如何将DerivedClass字典分配给DerivedClass字典?

I have 2 dictionaries. How I can assign DerivedClass dictionary to DerivedClass dictionary ?

下面的代码不担心吗?

如何更改它?

public class BaseClass
{
    public void DoWork() { }
    public int WorkField;
    public int WorkProperty
    {
        get { return 0; }
    }
}

public class DerivedClass : BaseClass
{
    public new void DoWork() { }
    public new int WorkField;
    public new int WorkProperty
    {
        get { return 0; }
    }
}


class Program
{
    static void Main(string[] args)
    {
        var derivedclass = new Dictionary<string, DerivedClass>();
        var baseClass = new Dictionary<string, BaseClass>();

        Dictionary<string, BaseClass> AAA = derivedclass;


        Console.ReadKey();
    }
}

推荐答案

您不能直接转换字典，但是可以创建一个新字典，类似这样的方法会起作用:

You can't cast the dictionary directly, but you can create a new dictionary, something like this will work:

Dictionary<string, BaseClass> AAA = 
    derivedclass.ToDictionary(
        k => k.Key, 
        v => (BaseClass)v.Value);

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