HttpWebRequest C＃上传文件 [英] HttpWebRequest C# uploading a file

问题描述

使用C＃，我试图整合我的网上商店W /电子邮件营销客户端。我想每晚上传一个逗号分隔的订阅者文件。他们说要得到这个工作，它必须是一个表格帖子：multipart / form-data，但我没有使用一个表单。我能够连接到他们的服务器，但我不断收回数据不能为空。任何人都可以帮助我得到这个工作？

$ p $ public static string Create（）
{
string authInfo =username+： 密码;

string root = AppDomain.CurrentDomain.BaseDirectory;
string file = root +Folder \\\\ work.txt;

FileInfo fi = new FileInfo（file）;
int fileLength =（int）fi.Length;

FileStream rdr = new FileStream（file，FileMode.Open）;

HttpWebRequest httpWebRequest =（HttpWebRequest）WebRequest.Create（url）;
httpWebRequest.Method =POST;
httpWebRequest.ContentType =application / x-www-form-urlencoded;
httpWebRequest.Accept =application / xml;

authInfo = Convert.ToBase64String（Encoding.Default.GetBytes（authInfo））;
httpWebRequest.Headers [授权] =基本+ authInfo;
byte [] requestBytes = new byte [fileLength];

int bytesRead = 0;
httpWebRequest.ContentLength = requestBytes.Length;
using（Stream requestStream = httpWebRequest.GetRequestStream（））
{
while（（bytesRead = rdr.Read（requestBytes，0，requestBytes.Length））！= 0）
{
requestStream.Write（requestBytes，0，bytesRead）;
requestStream.Close（）;


//从流读取响应
string responseData;
using（StreamReader responseStream = new StreamReader（httpWebRequest.GetResponse（）。GetResponseStream（）））
{
responseData = responseStream.ReadToEnd（）;
responseStream.Close（）;
}
return responseData;



解决方案

下面的代码在这个问题上得到了很好的回答：

pre $ //标识分隔符
string boundary =---- -----------------------+ DateTime.Now.Ticks.ToString（x）;
//编码
byte [] boundarybytes = System.Text.Encoding.ASCII.GetBytes（\r\\\
--+ boundary +\r\\\
）;

//创建并指定请求
HttpWebRequest wr =（HttpWebRequest）WebRequest.Create（url）; // sVal是webService的id
wr.ContentType =multipart / form-data; boundary =+ boundary;
wr.Method =POST;
wr.KeepAlive = true;
wr.Credentials = System.Net.CredentialCache.DefaultCredentials;
$ b $ string sAuthorization =login：password; // AUTHENTIFICATION BEGIN
byte [] toEncodeAsBytes = System.Text.ASCIIEncoding.ASCII.GetBytes（sAuthorization）;
string returnValue = System.Convert.ToBase64String（toEncodeAsBytes）;
wr.Headers.Add（Authorization：Basic+ returnValue）; // AUTHENTIFICATION END
流rs = wr.GetRequestStream（）;

$ b $ string formdataTemplate =Content-Disposition：form-data; name = \{0} \\r\\\
\r\\\
{1} ; //对于POST的格式

//写入文件
rs.Write（boundarybytes，0，boundarybytes.Length）;
byte [] formitembytes = System.Text.Encoding.UTF8.GetBytes（Server.MapPath（questions.pdf））;
rs.Write（formitembytes，0，formitembytes.Length）;

rs.Write（boundarybytes，0，boundarybytes.Length）;

string headerTemplate =Content-Disposition：form-data; name = \{0} \; filename = \{1} \\r\\\
Content-键入：{2} \r\\\
\r\\\
;
string header = string.Format（headerTemplate，file，questions.pdf，contentType）;
byte [] headerbytes = System.Text.Encoding.UTF8.GetBytes（header）;
rs.Write（headerbytes，0，headerbytes.Length）;

FileStream fileStream = new FileStream（Server.MapPath（questions.pdf），FileMode.Open，FileAccess.Read）;
byte [] buffer = new byte [4096];
int bytesRead = 0;
while（（bytesRead = fileStream.Read（buffer，0，buffer.Length））！= 0）
{
rs.Write（buffer，0，bytesRead）;
}
fileStream.Close（）;

byte [] trailer = System.Text.Encoding.ASCII.GetBytes（\r\\\
--+ boundary +--\r\\\
）;
rs.Write（trailer，0，trailer.Length）;
rs.Close（）;
rs = null;

WebResponse wresp = null;
尝试
{
//获取响应
wresp = wr.GetResponse（）;
Stream stream2 = wresp.GetResponseStream（）;
StreamReader reader2 = new StreamReader（stream2）;
string responseData = reader2.ReadToEnd（）;

catch（Exception ex）

string s = ex.Message;

finally

if（wresp！= null）
{
wresp.Close（）;
wresp = null;
}
wr = null;
}


using C#, I'm trying to integrate my web store w/ an email marketing client. I want to upload a comma delimited file of subscribers once a night. They say to get this to work, it has to be a form posts: multipart/form-data, but I'm not using a form. I'm able to connect to their servers but I keep getting back a Data can't be blank. Can anyone help me to get this working?

public static string Create()
    {
        string authInfo = "username" + ":" + "password";

        string root = AppDomain.CurrentDomain.BaseDirectory;
        string file = root + "Folder\\work.txt";

        FileInfo fi = new FileInfo(file);
        int fileLength = (int)fi.Length;

        FileStream rdr = new FileStream(file, FileMode.Open);

        HttpWebRequest httpWebRequest = (HttpWebRequest)WebRequest.Create(url);
        httpWebRequest.Method = "POST";
        httpWebRequest.ContentType = "application/x-www-form-urlencoded";
        httpWebRequest.Accept = "application/xml";

        authInfo = Convert.ToBase64String(Encoding.Default.GetBytes(authInfo));
        httpWebRequest.Headers["Authorization"] = "Basic " + authInfo;
        byte[] requestBytes = new byte[fileLength];

        int bytesRead = 0;
        httpWebRequest.ContentLength = requestBytes.Length;
        using (Stream requestStream = httpWebRequest.GetRequestStream())
        {
            while ((bytesRead = rdr.Read(requestBytes, 0, requestBytes.Length)) != 0)
            {
                requestStream.Write(requestBytes, 0, bytesRead);
                requestStream.Close();
            }
        }
        //READ RESPONSE FROM STREAM
        string responseData;
        using (StreamReader responseStream = new StreamReader(httpWebRequest.GetResponse().GetResponseStream()))
        {
            responseData = responseStream.ReadToEnd();
            responseStream.Close();
        }
        return responseData;
    }

解决方案

I had got the same problem and this following code answered perfectly at this problem :

//Identificate separator
string boundary = "---------------------------" + DateTime.Now.Ticks.ToString("x");
//Encoding
byte[] boundarybytes = System.Text.Encoding.ASCII.GetBytes("\r\n--" + boundary + "\r\n");

//Creation and specification of the request
HttpWebRequest wr = (HttpWebRequest)WebRequest.Create(url); //sVal is id for the webService
wr.ContentType = "multipart/form-data; boundary=" + boundary;
wr.Method = "POST";
wr.KeepAlive = true;
wr.Credentials = System.Net.CredentialCache.DefaultCredentials;

string sAuthorization = "login:password";//AUTHENTIFICATION BEGIN
byte[] toEncodeAsBytes = System.Text.ASCIIEncoding.ASCII.GetBytes(sAuthorization);
string returnValue = System.Convert.ToBase64String(toEncodeAsBytes);
wr.Headers.Add("Authorization: Basic " + returnValue); //AUTHENTIFICATION END
Stream rs = wr.GetRequestStream();


string formdataTemplate = "Content-Disposition: form-data; name=\"{0}\"\r\n\r\n{1}"; //For the POST's format

//Writting of the file
rs.Write(boundarybytes, 0, boundarybytes.Length);
byte[] formitembytes = System.Text.Encoding.UTF8.GetBytes(Server.MapPath("questions.pdf"));
rs.Write(formitembytes, 0, formitembytes.Length);

rs.Write(boundarybytes, 0, boundarybytes.Length);

string headerTemplate = "Content-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"\r\nContent-Type: {2}\r\n\r\n";
string header = string.Format(headerTemplate, "file", "questions.pdf", contentType);
byte[] headerbytes = System.Text.Encoding.UTF8.GetBytes(header);
rs.Write(headerbytes, 0, headerbytes.Length);

FileStream fileStream = new FileStream(Server.MapPath("questions.pdf"), FileMode.Open, FileAccess.Read);
byte[] buffer = new byte[4096];
int bytesRead = 0;
while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0)
{
    rs.Write(buffer, 0, bytesRead);
}
fileStream.Close();

byte[] trailer = System.Text.Encoding.ASCII.GetBytes("\r\n--" + boundary + "--\r\n");
rs.Write(trailer, 0, trailer.Length);
rs.Close();
rs = null;

WebResponse wresp = null;
try
{
    //Get the response
    wresp = wr.GetResponse();
    Stream stream2 = wresp.GetResponseStream();
    StreamReader reader2 = new StreamReader(stream2);
    string responseData = reader2.ReadToEnd();
}
catch (Exception ex)
{
    string s = ex.Message;
}
finally
{
    if (wresp != null)
    {
        wresp.Close();
        wresp = null;
    }
    wr = null;
}

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