如何发送带有正文字符串数组的发布请求

Question

我正在尝试在控制台应用程序中使用数组（如果在正文中包含字符串）发送和http发布请求，但是它不起作用。

这是代码：

WebRequest request = WebRequest.Create(Url);
request.Method = "POST";
request.ContentType = "application/json;charset=UTF-8";
string[] firstData = { "89", "354", "AF001" };
StreamWriter requestWriter = new StreamWriter(request.GetRequestStream());
requestWriter.Write(firstData);
requestWriter.Close();

string[] secondData = { "8911", "354", "01" };;
StreamWriter requestWriter2 = new StreamWriter(request.GetRequestStream());
requestWriter2.Write(secondData);
requestWriter2.Close();

Answer 1

您不能重复使用相同的WebRequest流，这是在两个StreamWriter实例上调用request.GetRequestStream时所做的。 这就是为什么它引发异常。 我不确定为什么您每次两次将请求流发送到另一个StreamWriter 。 您可以将它们简单地组合为一个：

WebRequest request = WebRequest.Create(Url);
request.Method = "POST";
request.ContentType = "application/json;charset=UTF-8";

using (StreamWriter requestWriter = new StreamWriter(request.GetRequestStream()))
{
    string[] firstData = { "89", "354", "AF001" };
    requestWriter.Write(firstData);

    string[] secondData = { "8911", "354", "01" }; ;
    requestWriter.Write(secondData);
}

附带说明一下，您可以使用WebClient大大减少代码的冗长性：

using (var webClient = new WebClient())
{
    webClient.Headers[HttpRequestHeader.ContentType] = "application/json";
    webClient.UploadData(Url, Encoding.UTF8.GetBytes(firstData));
    webClient.UploadData(Url, Encoding.UTF8.GetBytes(secondData));
}

Answer 2

我将string[]更改为var ，并且有效：

 WebRequest request = WebRequest.Create(apiUrl);
 request.Method = "POST";
 request.ContentType = "application/json;charset=UTF-8";

 data = "[ \"89\", \"354\", \"AF001\" ]";

 StreamWriter requestWriter = new StreamWriter(request.GetRequestStream());

 requestWriter.Write(data);

 requestWriter.Close();



  WebResponse response = request.GetResponse();
  Console.WriteLine(((HttpWebResponse)response).StatusDescription);

  response.Close();

  request = WebRequest.Create(url);
  request.Method = "POST";
  request.ContentType = "application/json;charset=UTF-8";


   StreamWriter requestWriter2 = new StreamWriter(request.GetRequestStream())

   var data2 = ""[ \"55\", \"3524\", \"b01\" ]";

   requestWriter2.Write(data2);
   requestWriter2.Close();

   WebResponse response2 = request.GetResponse()
   Console.WriteLine(((HttpWebResponse)response2).StatusDescription);

为第二个请求创建了新的WebResponse和StreamWriter