C#获取url中参数键值对的方法建议收藏

/// <summary>
/// 遍历Url中的参数列表
/// </summary>
/// <returns>如:(?userName=keleyi&userType=1)</returns>
public string GetUrlParam()
{
    string urlParam = "";
    if (Request.QueryString.Count > 0)
    {
        urlParam = "?";
        NameValueCollection keyVals = Request.QueryString;
        foreach (string key in keyVals.Keys)
        {
            urlParam += key + "=" + keyVals[key] + "&";
        }
        urlParam = urlParam.Substring(0, urlParam.LastIndexOf('&'));
    }
    return urlParam;
}