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[英]How to Access File Content from C# HTTPWebRequest with AutoRedirect
[英]How to set the content of an HttpWebRequest in C#?
HttpWebRequest具有ContentLength和ContentType属性,但是如何实际设置请求的内容?
以下内容应该让您入门
byte[] buffer = ...request data as bytes
var webReq = (HttpWebRequest) WebRequest.Create("http://127.0.0.1/target");
webReq.Method = "REQUIRED METHOD";
webReq.ContentType = "REQUIRED CONTENT TYPE";
webReq.ContentLength = buffer.Length;
var reqStream = webReq.GetRequestStream();
reqStream.Write(buffer, 0, buffer.Length);
reqStream.Close();
var webResp = (HttpWebResponse) webReq.GetResponse();
.NET 4.5(或通过添加NuGet的Microsoft.Net.Http包提供.NET 4.0)在设置请求内容时提供了很多额外的灵活性。 这是一个例子:
private System.IO.Stream Upload(string actionUrl, string paramString, Stream paramFileStream, byte [] paramFileBytes)
{
HttpContent stringContent = new StringContent(paramString);
HttpContent fileStreamContent = new StreamContent(paramFileStream);
HttpContent bytesContent = new ByteArrayContent(paramFileBytes);
using (var client = new HttpClient())
using (var formData = new MultipartFormDataContent())
{
formData.Add(stringContent, "param1", "param1");
formData.Add(fileStreamContent, "file1", "file1");
formData.Add(bytesContent, "file2", "file2");
var response = client.PostAsync(actionUrl, formData).Result;
if (!response.IsSuccessStatusCode)
{
return null;
}
return response.Content.ReadAsStreamAsync().Result;
}
}
这里有一个不同的选项,用于发布信息而不会弄乱Bytes和Streams。 我个人觉得更容易理解,阅读和调试。
// Convert Object to JSON
var requestMessage = JsonConvert.SerializeObject(requestObject);
var content = new StringContent(requestMessage, Encoding.UTF8, "application/json");
// Create the Client
var client = new HttpClient();
client.DefaultRequestHeaders.Add(AuthKey, AuthValue);
// Post the JSON
var responseMessage = client.PostAsync(requestEndPoint, content).Result;
var stringResult = responseMessage.Content.ReadAsStringAsync().Result;
// Convert JSON back to the Object
var responseObject = JsonConvert.DeserializeObject<ResponseObject>(stringResult);
HttpWebRequest的RequestStream是动作所在的位置 - 粗略代码......
//build the request object
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(http://someapi.com/);
//write the input data (aka post) to a byte array
byte[] requestBytes = new ASCIIEncoding().GetBytes(inputData);
//get the request stream to write the post to
Stream requestStream = request.GetRequestStream();
//write the post to the request stream
requestStream.Write(requestBytes, 0, requestBytes.Length);
如果您要发送扩展字符,请使用UTF8Encoding,请确保您也设置了正确的content-type / charset标头。
HttpWebRequest.GetRequestStream()
获取请求Stream。 设置标头后,使用GetRequestStream()
并将内容写入流。
这篇文章解释了如何使用HttpWebRequest
传输文件,这应该提供一个如何发送内容的好例子。
但是,基本上格式是
var stream = request.GetRequestStream();
stream.Write( stuff );
stream.Close();
var response = request.GetResponse();
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