错误：无法从字典转换为IDictionary [英] Error: Can't convert from Dictionary to IDictionary

问题描述

为什么有错误
错误52参数1：不能从'System.Collections.Generic.Dictionary>'转换为'System.Collections.Generic.IDictionary>'

Why is there an error Error 52 Argument 1: cannot convert from 'System.Collections.Generic.Dictionary>' to 'System.Collections.Generic.IDictionary>'

Dictionary<string, List<string>> tempResultIDList = new Dictionary<string,List<string>>();
test(tempResultIDList);

public bool test(IDictionary<string,IList<string>> a)
  {
            return true;
    }

推荐答案

字典< string，List< string>> 实现 IDictionary< string，List< string>> 到 IDictionary< string，* I * List< string>> 。这是不允许的，因为 IDictionary< string，IList< string>> 添加接受 IList< string> 的实例，而添加字典< string，list< string>> 中的c>方法不会接受 IList< string> 其输入。

Dictionary<string, List<string>> implements IDictionary<string, List<string>>, while you're trying to cast it to IDictionary<string, *I*List<string>>. It is not allowed, because IDictionary<string, IList<string>> has e.g. the method Add accepting instance of IList<string>, while Add method in your Dictionary<string, List<string>> won't accept IList<string> as its input.

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