c# - 以编程方式使用 POST 发送表单

Question

我需要通过 POST 以编程方式发送表单。我有 4 个字段，一个复选框和一个提交按钮。我该怎么做？

Answer 1

假设您的问题是关于表单应用程序，我使用这些函数。
你可以打电话

HttpPost(
    post_url, 
    "field_name_1", value_1,
    "field_name_2", value_2,
    ...);

他们在这里:

public static string HttpPost(string url, params object[] postData)
{
    StringBuilder post = new StringBuilder();
    for (int i = 0; i < postData.Length; i += 2)
         post.Append(string.Format("{0}{1}={2}", i == 0 ? "" : "&", postData[i], postData[i + 1]));
    return HttpPost(url, post.ToString());
}
public static string HttpPost(string url, string postData)
{
    postData = postData.Replace("\r\n", "");
    try
    {
         WebRequest req = WebRequest.Create(url);
         byte[] send = Encoding.Default.GetBytes(postData);
         req.Method = "POST";
         req.ContentType = "application/x-www-form-urlencoded";
         req.ContentLength = send.Length;

         Stream sout = req.GetRequestStream();
         sout.Write(send, 0, send.Length);
         sout.Flush();
         sout.Close();

         WebResponse res = req.GetResponse();
         StreamReader sr = new StreamReader(res.GetResponseStream());
         string returnvalue = sr.ReadToEnd();
         return returnvalue;
    }
    catch (Exception ex)
    {
         Debug.WriteLine("POST Error on {0}\n  {1}", url, ex.Message);
         return "";
    }
}