C＃WPF从字符串中分隔字符（从后面开始）

I have such a comic string.

我有这样一个漫画字符串。

www.asdsad.de/dsfdsf/sdfdsf=dsfdsfs?dsfsndfsajdn=sfdjasdhads=test.xlsx

www.asdsad.de/dsfdsf/sdfdsf=dsfdsfs?dsfsndfsajdn=sfdjasdhads=test.xlsx

I would like to get only the test.xlsx out. So I wanted to say that I wanted to separate the string from behind. That he he once the first = sign found me the string supplies the from the end to the = sign goes.

我想只得到test.xlsx。所以我想说我想将字符串从后面分开。他曾经是第一个=符号发现我字符串从最后提供给=符号。

Whats the best way to do this?

什么是最好的方法呢？

Unfortunately, I would not know how I should do with SubString, since the length can always be different. But I know that in the end is what I need and the unnecessary with the first = Begin from behind

不幸的是，我不知道如何处理SubString，因为长度总是不同的。但我知道到底是我需要的东西和第一个不必要的东西=从后面开始

2 个解决方案

#1

Yes, Substring will do, and there's no need to know the length:

是的，Substring会这样做，而且不需要知道长度：

string source = "www.asdsad.de/dsfdsf/sdfdsf=dsfdsfs?dsfsndfsajdn=sfdjasdhads=test.xlsx";

// starting from the last '=' up to the end of the string
string result = source.SubString(source.LastIndexOf("=") + 1);

#2

Another option:

另外一个选择：

string source = "www.asdsad.de/dsfdsf/sdfdsf=dsfdsfs?dsfsndfsajdn=sfdjasdhads=test.xlsx";

Stack<char> sb = new Stack<char>();

for (var i = source.Length - 1; i > 0; i--)
{
    if (source[i] == '=')
    {
        break;
    }

    sb.Push(source[i]);
}

var result = string.Concat(sb.ToArray());

#1