我有一个按钮，我正在尝试执行 a GETthen a POST，我想知道是否有人可以帮助我使用下面的代码，我想要做的是将它设置MessageID为一个字符串，以便我可以将它用于POST uriAddMessagetoGroup. ..
XDocument xDoc = XDocument.Load(uri1);
var MessageID = xDoc.Descendants("Message")
.Select(n => new
{
n.Element("MessageID").Value,
})
.ToString();
string uriAddMessagetoGroup = string.Format("http://localhost:8000/Service/AddMessagetoGroup/{0}/{1}/{2}", textBox4.Text, MessageID, textBox21.Text);
完整代码：
private void button3_Click(object sender, EventArgs e)
{
//Get the newly created message while the text is still in the textbox and find its messageID (int)
string uri1 = "http://localhost:8000/Service/GetMessage/{anything}";
string tagUri = uri1.Replace("{anything}", textBox21.Text);
XDocument xDoc = XDocument.Load(tagUri);
var MessageID = xDoc.Descendants("Message")
.Select(n => n.Element("MessageID").Value.ToString());
//add the string to the uri and add the message to the relevant group while the group still exists in the textbox
string uriAddMessagetoGroup = string.Format("http://localhost:8000/Service/AddMessagetoGroup/{0}/{1}/{2}", textBox4.Text, MessageID, textBox21.Text);
byte[] arr2 = Encoding.UTF8.GetBytes(uriAddMessagetoGroup);
HttpWebRequest req2 = (HttpWebRequest)WebRequest.Create(uriAddMessagetoGroup);
req2.Method = "POST";
req2.ContentType = "application/xml";
req2.ContentLength = arr2.Length;
Stream reqStrm2 = req2.GetRequestStream();
reqStrm2.Write(arr2, 0, arr2.Length);
reqStrm2.Close();
HttpWebResponse resp2 = (HttpWebResponse)req2.GetResponse();
MessageBox.Show(resp2.StatusDescription);
reqStrm2.Close();
resp2.Close();