C# 微信回复图文消息时，图文消息多参数链接上不带‘&‘，弄了好久没找见原因，求解答

send_news.Url ="https://open.weixin.qq.com/connect/oauth2/authorize?appid=" + appid + "&redirect_uri=" + redirect_uri + "&response_type=code&scope=SCOPE&state=123#wechat_redirect";

StringBuilder strB = new StringBuilder();

StringBuilder strB = new StringBuilder();
                    strB.Append("<?xml version=\"1.0\"?>");
                    strB.Append("<xml>");
                    strB.Append("<ToUserName>").Append(send_news.ToUserName).Append("</ToUserName>");
                    strB.Append("<FromUserName>").Append(send_news.FromUserName).Append("</FromUserName>");
                    strB.Append("<CreateTime>").Append(send_news.CreateTime).Append("</CreateTime>");
                    strB.Append("<MsgType>").Append(send_news.MsgType).Append("</MsgType>");
                    strB.Append("<ArticleCount>");
                    strB.Append(send_news.ArticleCount);
                    strB.Append("</ArticleCount>");
                    strB.Append("<Articles>");
                    strB.Append("<item>");
                    strB.Append("<Title>");
                    strB.Append(send_news.Title);
                    strB.Append("</Title>");
                    strB.Append("<Description>");
                    strB.Append(send_news.Description);
                    strB.Append("</Description>");
                    strB.Append("<PicUrl>");
                    strB.Append(send_news.PicUrl);
                    strB.Append("</PicUrl>");
                    strB.Append("<Url>");
                    strB.Append(send_news.Url);
                    strB.Append("</Url>");
                    strB.Append("</item>");
                    strB.Append("</Articles>");
                    strB.Append("</xml>");

Response.ContentEncoding = Encoding.UTF8;
Response.Output.Write(strB.ToString());

这是微信上显示的链接

https://open.weixin.qq.com/connect/oauth2/authorize?appid=wxcb53d51eb6aec0redirect_uri=http://1543685gu0.iok.la:2250/oauth.aspxresponse_type=codescope=SCOPEstate=123#wechat_redirect

 &改为&

，因为&是xml的关键字