使用 HTTPWebrequest (multipart/form-data) 上传文件 [英] Upload files with HTTPWebrequest (multipart/form-data)

问题描述

是否有任何类、库或一些代码可以帮助我使用 HTTPWebrequest 上传文件?

Is there any class, library or some piece of code which will help me to upload files with HTTPWebrequest?

编辑 2:

我不想上传到 WebDAV 文件夹或类似的文件夹.我想模拟一个浏览器，就像您将头像上传到论坛或通过 Web 应用程序中的表单上传文件一样.上传到使用 multipart/form-data 的表单.

I do not want to upload to a WebDAV folder or something like that. I want to simulate a browser, so just like you upload your avatar to a forum or upload a file via form in a web application. Upload to a form which uses a multipart/form-data.

WebClient 未满足我的要求，因此我正在寻找具有 HTTPWebrequest 的解决方案.

WebClient is not cover my requirements, so I'm looking for a solution with HTTPWebrequest.

推荐答案

我正在寻找这样的东西，发现于:http://bytes.com/groups/net-c/268661-how-upload-file-via-c-code(为了正确性而修改):

I was looking for something like this, Found in : http://bytes.com/groups/net-c/268661-how-upload-file-via-c-code (modified for correctness):

public static string UploadFilesToRemoteUrl(string url, string[] files, NameValueCollection formFields = null)
{
    string boundary = "----------------------------" + DateTime.Now.Ticks.ToString("x");

    HttpWebRequest request = (HttpWebRequest) WebRequest.Create(url);
    request.ContentType = "multipart/form-data; boundary=" +
                            boundary;
    request.Method = "POST";
    request.KeepAlive = true;

    Stream memStream = new System.IO.MemoryStream();

    var boundarybytes = System.Text.Encoding.ASCII.GetBytes("
--" +
                                                            boundary + "
");
    var endBoundaryBytes = System.Text.Encoding.ASCII.GetBytes("
--" +
                                                                boundary + "--");


    string formdataTemplate = "
--" + boundary +
                                "
Content-Disposition: form-data; name="{0}";

{1}";

    if (formFields != null)
    {
        foreach (string key in formFields.Keys)
        {
            string formitem = string.Format(formdataTemplate, key, formFields[key]);
            byte[] formitembytes = System.Text.Encoding.UTF8.GetBytes(formitem);
            memStream.Write(formitembytes, 0, formitembytes.Length);
        }
    }

    string headerTemplate =
        "Content-Disposition: form-data; name="{0}"; filename="{1}"
" +
        "Content-Type: application/octet-stream

";

    for (int i = 0; i < files.Length; i++)
    {
        memStream.Write(boundarybytes, 0, boundarybytes.Length);
        var header = string.Format(headerTemplate, "uplTheFile", files[i]);
        var headerbytes = System.Text.Encoding.UTF8.GetBytes(header);

        memStream.Write(headerbytes, 0, headerbytes.Length);

        using (var fileStream = new FileStream(files[i], FileMode.Open, FileAccess.Read))
        {
            var buffer = new byte[1024];
            var bytesRead = 0;
            while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0)
            {
                memStream.Write(buffer, 0, bytesRead);
            }
        }
    }

    memStream.Write(endBoundaryBytes, 0, endBoundaryBytes.Length);
    request.ContentLength = memStream.Length;

    using (Stream requestStream = request.GetRequestStream())
    {
        memStream.Position = 0;
        byte[] tempBuffer = new byte[memStream.Length];
        memStream.Read(tempBuffer, 0, tempBuffer.Length);
        memStream.Close();
        requestStream.Write(tempBuffer, 0, tempBuffer.Length);
    }

    using (var response = request.GetResponse())
    {
        Stream stream2 = response.GetResponseStream();
        StreamReader reader2 = new StreamReader(stream2);
        return reader2.ReadToEnd();
    }
}

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