本文介绍了一个使用C#实现的函数，用于从URL中提取指定参数的值。通过正则表达式匹配URL字符串，该函数能有效地解析并返回所需参数的值。
<wbr><wbr><wbr><wbr> public static string GetUrlParam(string url, string name)</wbr></wbr></wbr></wbr>
<wbr><wbr><wbr><wbr> {</wbr></wbr></wbr></wbr>
<wbr><wbr><wbr><wbr><wbr><wbr> string rst = string.Empty;</wbr></wbr></wbr></wbr></wbr></wbr>
<wbr><wbr><wbr><wbr><wbr><wbr> try</wbr></wbr></wbr></wbr></wbr></wbr>
<wbr><wbr><wbr><wbr><wbr><wbr> {</wbr></wbr></wbr></wbr></wbr></wbr>
<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> if (url.Contains("#")) url = url.Substring(0, url.IndexOf("#"));</wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>
<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> MatchCollection matchs = Regex.Matches(url,</wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>
<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> @"(?:^|\?|&)" + name + "=([^&]*)(?:&|$)",</wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>
<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> RegexOptions.IgnoreCase);</wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>
<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> for (int i = 0; i < matchs.Count; i++)</wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>
<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> {</wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>
<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> return matchs[i].Groups[1].Value;</wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>
<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> }</wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>
<wbr><wbr><wbr><wbr><wbr><wbr> }</wbr></wbr></wbr></wbr></wbr></wbr>
<wbr><wbr><wbr><wbr><wbr><wbr> catch</wbr></wbr></wbr></wbr></wbr></wbr>
<wbr><wbr><wbr><wbr><wbr><wbr> {</wbr></wbr></wbr></wbr></wbr></wbr>
<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> Log.log.WriteLog("url出错:" + url);</wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>
<wbr><wbr><wbr><wbr><wbr><wbr> }</wbr></wbr></wbr></wbr></wbr></wbr>
<wbr><wbr><wbr><wbr><wbr><wbr> return rst;</wbr></wbr></wbr></wbr></wbr></wbr>
<wbr><wbr><wbr><wbr> }</wbr></wbr></wbr></wbr>
function GetUrlParamById(url, name) {
<wbr><wbr> var str = url.replace(/\//g, "-").replace(/\\/g, "-");</wbr></wbr>
<wbr><wbr> var reg = new RegExp("(^|&|\\?)" + name + "=([^&]*)(&|$)"), r;</wbr></wbr>
<wbr><wbr> if (r = str.match(reg)) return (r[2]); return "";</wbr></wbr>
}
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