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我正在使用以下代码。我有一个问题，其中“参数”是一个字符串，我里面有空格字符，无论我是否在将其转换为字节之前使用 HttpUtility.UrlDecode(parameters)，在 Wireshark 中我都看到 postdata 是 bla+bla+bla 而不是布拉布拉布拉。

这是什么原因造成的？编码？

WebRequest request = WebRequest.Create(uri);

// Set the Method property of the request to POST.
request.Method = "POST";

// Create POST data and convert it to a byte array.
string postData = parameters;
byte[] byteArray = Encoding.UTF8.GetBytes(postData);


// Set the ContentType property of the WebRequest.
request.ContentType = "application/x-www-form-urlencoded";

// Set the ContentLength property of the WebRequest.
request.ContentLength = byteArray.Length;

// Get the request stream.
Stream dataStream = request.GetRequestStream();

// Write the data to the request stream.
dataStream.Write(byteArray, 0, byteArray.Length);

// Close the Stream object.
dataStream.Close();

// Get the response.
WebResponse response = request.GetResponse();

// Display the status.
Console.WriteLine(((HttpWebResponse)response).StatusDescription);

// Get the stream containing content returned by the server.
dataStream = response.GetResponseStream();

// Open the stream using a StreamReader for easy access.
StreamReader reader = new StreamReader(dataStream);

// Read the content.
string responseFromServer = reader.ReadToEnd();

// Display the content.
string res = responseFromServer;

// Clean up the streams.
reader.Close();
dataStream.Close();
response.Close();

return res;
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