您可以只是做一个的System.Uri对象，并使用ISFILE来验证它的一个文件，然后的 Uri.LocalPath 提取的文件名。

这是安全得多，因为它为您提供检查URI的有效性以及一个手段。

编辑回应评论：

要得到公正的完整文件名，我会使用：

 开放的URI =新的URI（hreflink）;
如果（uri.IsFile）{
    字符串文件名= System.IO.Path.GetFileName（uri.LocalPath）;
}
 

这做了所有的错误检查你的，与平台无关。所有的特殊情况下会为你快速，方便地处理。

I have this method for grabbing the file name from a string URI. What can I do to make it more robust?

private string GetFileName(string hrefLink)
{
    string[] parts = hrefLink.Split('/');
    string fileName = "";

    if (parts.Length > 0)
        fileName = parts[parts.Length - 1];
    else
        fileName = hrefLink;

    return fileName;
}

You can just make a System.Uri object, and use IsFile to verify it's a file, then Uri.LocalPath to extract the filename.

This is much safer, as it provides you a means to check the validity of the URI as well.

Edit in response to comment:

To get just the full filename, I'd use:

Uri uri = new Uri(hreflink);
if (uri.IsFile) {
    string filename = System.IO.Path.GetFileName(uri.LocalPath);
}

This does all of the error checking for you, and is platform-neutral. All of the special cases get handled for you quickly and easily.