由于字符串： /Projects/Multiply_Amada/MultiplyWeb/Shared/Home.aspx

我想之后的第三 / ，这样的结果是去除所有尾随字符： /项目/ Multiply_Amada /

I want to remove all trailing characters after the third /, such that the result is: /Projects/Multiply_Amada/

我想做到这一点，而无需使用拆分或CHARINDEX。

I would like to do this without using Split or Charindex.

推荐答案

OK，你的要求是有点困难。那么，是什么样：

OK, your requirements are a bit tough. So, what about this:

string RemoveAfterThirdSlash(string str)
{
    return str.Aggregate(
            new {
                sb = new StringBuilder(),
                slashes = 0
            }, (state, c) => new {
                sb = state.slashes >= 3 ? state.sb : state.sb.Append(c),
                slashes = state.slashes + (c == '/' ? 1 : 0)
            }, state => state.sb.ToString()
        );
}

Console.WriteLine(RemoveAfterThirdSlash("/Projects/Multiply_Amada/MultiplyWeb/Shared/Home.aspx"));