Post 页面数据，使用boundary来格式化

如果你需要post一个form-data到后台，使用multipart/form-data,需要使用boundary来格式化，

一般百度到的都是直接分开写入请求流里面，我这个先组织好字符串后直接写入流。

还有现在用application/x-www-form-urlencoded;charset=utf-8格式化的多。组织起来比较简单：

apiInput.Body = $"CMD={cmd}&AppId={appId}&AppCode={appCode}&Data={cert}";

下面是c#，参考代码。 

 

 public  string boundary = "----" + DateTime.Now.Ticks.ToString("x");
ContentType = $"multipart/form-data;boundary={boundary}"

 

     //var ds = new Dictionary<string, string>();
            //ds.Add("CMD", cmd);
            //ds.Add("AppId", appId);
            //ds.Add("AppCode", appCode);
            //ds.Add("Data", cert);
          
            //apiInput.Body = generateFormDataString(ds, boundary);

 

 private static string generateFormDataString(Dictionary<string, string> props,string boundary)
        {
            
         
            StringBuilder sb = new StringBuilder();
            //var beginBoundary = string.Format("--{0}\r\n", boundary);
            var endBoundary = string.Format("--{0}--", boundary);
            //var sortdir = props.OrderBy(p => p.Key).ToDictionary(p => p.Key, o => o.Value);
            int i = 0;
            //sb.Append(beginBoundary);
            foreach (var item in props)
            {
                sb.Append("--" + boundary + "\r\n");
                sb.Append("Content-Disposition: form-data; name=\"" + item.Key + "\"\r\n");
                sb.Append("\r\n");
                sb.Append(item.Value + "\r\n");
                //sb.Append(string.Format("Content-Disposition: form-data; name=\"{0}\"\r\n\r\n{1}\r\n{2}",
                //     item.Key, item.Value, boundary));
                i++;
            }
            sb.Append(endBoundary);
            return sb.ToString();
        }