将通用列表转换为字符串列表 [英] convert generic list to string list

问题描述

有一种方法可以将通用列表转换为列表...我试过这样，但我得到一个异常....请帮助

Is there a way to convert a generic list to list...I tried like this but I get an exception....Please help

Class Demo
{
    public list<string> convert()
    {
        List<example> eg = new List<example>();
        eg.Add(new example{"Hello"});
        eg.Add(new example{"World"});
        List<string> str = new List<string>();
        str = eg.Cast<string>().ToList(); //Returns an System.InvalidCastException.
                             // Is there a way to cast a generic list to string list..
        return str;
    }
}

Class example
{
     public string name{ get; set; }
}

推荐答案

投影，而不是投。这是因为您的示例类不能转换为 string 。在LINQ中，投影由选择方法执行：

What you need is a projection, not a cast. That's because your example class cannot be casted to string. In LINQ, projection is done by Select method:

return eg.Select(x => x.name).ToList();

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