var canonicallink = Request.Url.Scheme + "://" + Request.Url.Authority + Request.Url.AbsolutePath.ToString();

我已经创建了一个简单的扩展，因为其他一些答案抛出空异常，如果没有QueryString开始:

public static string TrimQueryString(this string source)
{ 
    if (string.IsNullOrEmpty(source))
            return source;

    var hasQueryString = source.IndexOf('?') != -1;

    if (!hasQueryString)
        return source;

    var result = source.Substring(0, source.IndexOf('?'));

    return result;
}

用法:

var url = Request.Url?.AbsoluteUri.TrimQueryString() 

var canonicallink = Request.Url.Scheme + "://" + Request.Url.Authority + Request.Url.AbsolutePath.ToString();

简单的例子是使用子字符串:

string your_url = "http://www.example.com/mypage.aspx?myvalue1=hello&myvalue2=goodbye";
string path_you_want = your_url .Substring(0, your_url .IndexOf("?"));

这是我的解决方案:

Request.Url.AbsoluteUri.Replace(Request.Url.Query, String.Empty);

Request.RawUrl.Split(new[] {'?'})[0];