string replace问题

Question

string referer = "http://118.26.232.106:8080/Cmsui//admin/cms_total/stat.aspx?id=10&referer=http%3A//www.google.cn/search%3Fcomplete%3D1%26hl%3Dzh-CN%26newwindow%3D1%26client%3Dfirefox-a%26rls%3Dorg.mozilla%253Azh-CN%253Aofficial%26hs%3DyEH%26q%3Dp-2-a%26btnG%3DGoogle+%25E6%2590%259C%25E7%25B4%25A2%26meta%3D%26aq%3Df&style=no&screenwidth=1024";
//分析来源地址
     if(referer=="")
referer="0";
            urlkeyword = "";
            refsite = "";
            referer.Replace("%3D", "=");
            referer.Replace("%26", "&");为啥replace后没变呢

Answer 1

referer= referer.Replace("%3D", "="); 
referer=referer.Replace("%26", "&"); 

Answer 2

referer=referer.Replace("%3D", "="); 

Answer 3

你Replace 后没有赋值回去。Replace（）函数返回一个替换以后的String，所以要referer改变就得referer=String；即：
referer=referer.Replace("%3D", "="); 

Answer 4

referer= referer.Replace("%3D", "=").("%26", "&");

Answer 5

referer = referer.Replace("%3D", "=").Replace("%26", "&"); 

Answer 6

referer= referer.Replace("%3D", "=").Replace("%26", "&"); 

Answer 7

// 建议使用 UrlDecode()
referer = System.Web.HttpUtility.UrlDecode(referer);