フォーム送信？ | Codetter（こーどったー）

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switch (contentType)
{
    case "application/x-www-form-urlencoded":
        if (parameters.Any(param => param.IsFile)) throw new ArgumentException("application/x-www-form-urlencodedでファイルを送ることはできません。");
        req.ContentType = "application/x-www-form-urlencoded";
        using (var sw = new StreamWriter(req.GetRequestStream()))
            sw.Write(string.Join("&", parameters.Select(data => Uri.EscapeDataString(data.Name) + "=" + Uri.EscapeDataString(data.Content))));
        break;
    case "multipart/form-data":
        var boundary = Guid.NewGuid().ToString();
        req.ContentType = "multipart/form-data; boundary=" + boundary;
        using (var stream = req.GetRequestStream())
        {
            foreach (var param in parameters)
            {
                stream.WriteText("--" + boundary + "\r\n");
                var contentDisposition = new List<string>();
                contentDisposition.Add("form-data");
                contentDisposition.Add(string.Format(@"name=""{0}""", param.Name));
                if (param.IsFile)
                    contentDisposition.Add(string.Format(@"filename=""{0}""", Path.GetFileName(param.Content)));
                stream.WriteText("Content-Disposition: " + string.Join("; ", contentDisposition));
                if (!string.IsNullOrEmpty(param.ContentType))
                    stream.WriteText("Content-Type: " + param.ContentType);
                stream.WriteText("\r\n\r\n");
                if (!param.IsFile)
                {
                    stream.WriteText(param.Content);
                }
                else
                {
                    stream.WriteAll(File.ReadAllBytes(param.Content));
                }
                stream.WriteText("\r\n");
            }
            stream.WriteText("--" + boundary + "--");
        }
        break;
}
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