我对PayPal集成一无所知，但有可能两次指定 business = 令人困惑的事情？

此外，您在 redirectUrl 中包含的值是否适当地进行了Url编码？ （参见 HttpUtility.UrlEncode Method（String）（System.Web） [ ^ ]和/或 HttpUtility.UrlPathEncode方法（字符串）（System.Web） [ ^ ]。）



您所拥有的代码有点草率;-)

以下是我如何构建它（我没有解决编码潜在问题。）

选项1：

I don't know anything about PayPal integration, but is it possible that having the business= specified twice is confusing things?
Also, are the values you are including in the redirectUrl are appropriately Url encoded? (See HttpUtility.UrlEncode Method (String) (System.Web)[^] and/or HttpUtility.UrlPathEncode Method (String) (System.Web)[^].)

The code you have is a bit sloppy ;-)
Here's how I'd structure it (I'm not addressing the encoding potential issue.)
Option 1:

const string redirectUrlFormat = 
"https://www.sandbox.paypal.com/cgi-bin/webscr?cmd=_xclick&business={0}" + 
"&first_name=name" +
"&item_name={1}" +
"&amount={2}" +
// "&business=Paypalmail"    // This was the duplication!!!
"&quantity=1" +
"&return={3}"
"&cancel_return={4}";
string redirectUrl = string.Format(redirectUrlFormat,
                                   ConfigurationManager.AppSettings["paypalemail"],
                                   Name, Price,
                                   ConfigurationManager.AppSettings["SuccessURL"],
                                   ConfigurationManager.AppSettings["FailedURL"]);
Response.Redirect(redirectUrl);

选项2：

Option 2:

StringBuilder redirectUrl = new StringBuilder();

redirectUrl.Add("https://www.sandbox.paypal.com/cgi-bin/webscr?cmd=_xclick&business=");
redirectUrl.Add(ConfigurationManager.AppSettings["paypalemail"]);
redirectUrl.Add("&first_name=name&item_name=");
redirectUrl.Add(Name);
redirectUrl.Add("&amount=");
redirectUrl.Add(Price);
redirectUrl.Add("&quantity=1&return=");
redirectUrl.Add(ConfigurationManager.AppSettings["SuccessURL"]);
redirectUrl.Add("&cancel_return=");
redirectUrl.Add(ConfigurationManager.AppSettings["FailedURL"]);

Response.Redirect(redirectUrl.ToString());