asp.net - Paypal 多参数返回，cancel_return urls

Question

我在 ASP.NET 应用程序中进行简单的 Paypal 支付集成，我尝试为成功和取消构建返回查询字符串，但它不起作用，因为我在查询字符串中发送了多个参数

string returnUrl = ConfigurationManager.AppSettings["PayPalSandBoxUrl"] + "&business=" + email;
        returnUrl += "&amount= 100";
        returnUrl += "&item_name=Invoice to somebody";
        // the problem goes in following params
        returnUrl += "&return=" + ConfigurationManager.AppSettings["Domain"] + "Payment.aspx?param1=" + param1 + "&param2=" + param2 ;
        returnUrl += "&cancel_return=" + ConfigurationManager.AppSettings["Domain"] + "Payment.aspx?cancel=true&param1=" + param1;

我认为 paypal 请求参数和返回查询参数之间有些混淆，对此有什么解决方案吗？？

Answer 1

当您在 URL 参数上添加包含可能混淆真实参数的符号时，如 ?、&、/ 等符号，你必须用 UrlEncode 对它们进行编码

所以让你的字符串为:

string returnUrl = 
        ConfigurationManager.AppSettings["PayPalSandBoxUrl"] 
         + "&business=" + HttpServerUtility.UrlEncode(email);
        returnUrl += "&amount= 100";
        returnUrl += "&item_name=" + HttpServerUtility.UrlEncode("Invoice to somebody");
        // the problem goes in following params
        returnUrl += "&return=" 
          + HttpServerUtility.UrlEncode(ConfigurationManager.AppSettings["Domain"] + "Payment.aspx?param1=" + param1 + "&param2=" + param2) ;
        returnUrl += "&cancel_return=" 
          + HttpServerUtility.UrlEncode(ConfigurationManager.AppSettings["Domain"] + "Payment.aspx?cancel=true&param1=" + param1 );