C#扩展索引器? [英] C# extend indexer?

问题描述

是否可以使用扩展方法来扩展索引器?我希望能够使用这样的标题文本从给定的DataGridViewRow的DataGridViewCell中获取单元格的值:

Is it possible to use extension methods to extend an indexer? I want to be able to get cell's value from DataGridViewCell of given DataGridViewRow using header text like this:

object o = row["HeaderText"]; 

我有这个代码

public static class Ext
{
    public static object Cells(this DataGridViewRow r, string header)
    {
        foreach (DataGridViewCell c in r.Cells)
        {
            if (c.OwningColumn.HeaderText == header)
            {
                return c.Value;
            }
        }
        return null;
    }
}

，我想要类似的索引器.谢谢.

and I want similar indexer. Thanks.

推荐答案

索引器实际上是属性，而扩展名属性在C#中不存在.因此，这无法按照您想要的方式进行.

Indexers are actually properties, and extension properties do not exist in C#. So this can't be done the way you want.

请参见此博客文章关于该主题的一些背景知识，以及为什么要考虑该功能的解释，但最终在C#3.0中被省略了.

See this blog post for some background on the subject, and an explanation as to why that feature was considered, but ultimately omitted from C# 3.0.

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