继续我的帖子..
Saving an image from HTTP POST (Not using FileUpload Control)。我有点假设我可以使用 Request.Files..
为了测试保存功能，我现在正在研究通过 HTTP Post 发送图像，方法是在后面的代码中动态制作此 HTTP Post，并且不使用 FileUpload 控件强>。
这里涉及到了..
Send a file via HTTP POST with C#
但是，我正在寻找一个更完整的示例，并且可以确保维护其他 POST 变量。
事实上，这个可能会有所帮助..
Multipart forms from C# client
更新： 对不起..问题是..
如何通过 HTTP Post（无文件上传控制）连同其他 POST 变量将图像发送到 url，并让 Request.Files 在目标 url 中提取它？
解决方案
最后我在这里使用 WebHelpers 类解决了这个问题
【问题讨论】：
对于遇到此问题的任何人，使用 .NET 4.5（或 .NET 4.0，通过从 NuGet 添加 Microsoft.Net.Http 包）的更现代方法是使用 Microsoft.Net.Http。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;
}
}
【讨论】：
我使用以下代码：
用法
List<IPostDataField> Fields = new List<IPostDataField>();
Fields.Add(new PostDataField() { Name="nameOfTheField", Value="value" }); //simple field
Fields.Add(new PostDataFile() { Name="nameOfTheField", FileName="something.ext", Content = byte[], Type = "mimetype" });
string response = WebrequestManager.PostMultipartRequest(
new PostDataEntities.PostData()
{
Fields = Fields
}
,
"url");
PostMultiPartRequest
public static string PostMultipartRequest(PostData postData, string relativeUrl, IUserCredential userCredential)
{
string returnXmlString = "";
try
{
//Initialisatie request
WebRequest webRequest = HttpWebRequest.Create(string.Format(Settings.Default.Api_baseurl, relativeUrl));
//Credentials
NetworkCredential apiCredentials = userCredential.NetworkCredentials;
webRequest.Credentials = apiCredentials;
webRequest.Headers.Add("Authorization", "Basic " + Convert.ToBase64String(new ASCIIEncoding().GetBytes(apiCredentials.UserName + ":" + apiCredentials.Password)));
//Post!
webRequest.Method = "POST";
webRequest.ContentType = "multipart/form-data; boundary=";
//Post
//byte[] bytesToWrite = UTF8Encoding.UTF8.GetBytes(multipartData);
string boundary = "";
byte[] data = postData.Export(out boundary);
webRequest.ContentType += boundary;
webRequest.ContentLength = data.Length;
using (Stream xmlStream = webRequest.GetRequestStream())
{
xmlStream.Write(data, 0, data.Length);
}
//webRequest.ContentType = "application/x-www-form-urlencoded";
using (WebResponse response = webRequest.GetResponse())
{
// Display the status
// requestStatus = ((HttpWebResponse)response).StatusDescription;
//Plaats 'response' in stream
using (Stream xmlResponseStream = response.GetResponseStream())
{
//Gebruik streamreader om stream uit te lezen en om te zetten naar string
using (StreamReader reader = new StreamReader(xmlResponseStream))
{
returnXmlString = reader.ReadToEnd();
}
}
}
}
catch (WebException wexc)
{
switch (wexc.Status)
{
case WebExceptionStatus.Success:
case WebExceptionStatus.ProtocolError:
log.Debug("bla", wexc);
break;
default:
log.Warn("bla", wexc);
break;
}
}
catch (Exception exc)
{
log.Error("bla");
}
return returnXmlString;
}
IPostdataField
public interface IPostDataField
{
byte[] Export();
}
PostDataField
public class PostDataField : IPostDataField
{
public string Name { get; set; }
public string Value { get; set; }
#region IPostDataField Members
public byte[] Export()
{
using (MemoryStream stream = new MemoryStream())
{
StreamWriter sw = new StreamWriter(stream);
{
StringBuilder sb = new StringBuilder();
sb.AppendLine(string.Format("Content-Disposition: form-data; name=\"{0}\"", Name));
sb.AppendLine();
sb.AppendLine(Value);
sw.Write(sb.ToString());
sw.Flush();
}
stream.Position = 0;
byte[] buffer = new byte[stream.Length];
stream.Read(buffer, 0, (int)buffer.Length);
return buffer;
}
}
#endregion
}
后数据文件
public class PostDataFile : IPostDataField
{
public Byte[] Content { get; set; }
public string Name { get; set; }
public string FileName { get; set; }
public string Type { get; set; } // mime type
public byte[] Export()
{
using (MemoryStream stream = new MemoryStream())
{
StreamWriter sw = new StreamWriter(stream);
StringBuilder sb = new StringBuilder();
sb.AppendLine(string.Format("Content-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"", Name, FileName));
sb.AppendLine("Content-Type: " + Type);
sb.AppendLine();
sw.Write(sb.ToString());
sw.Flush();
stream.Write(Content, 0, Content.Length);
stream.Position = 0;
byte[] buffer = new byte[stream.Length];
stream.Read(buffer, 0, (int)buffer.Length);
return buffer;
}
}
}
邮政数据
public class PostData
{
public PostData() { Fields = new List<IPostDataField>(); }
public List<IPostDataField> Fields { get; set; }
public Byte[] Export(out string boundary)
{
using (MemoryStream stream = new MemoryStream())
{
Random r = new Random();
string tok = "";
for (int i = 0; i < 14; i++)
tok += r.Next(10).ToString();
boundary = "---------------------------" + tok;
using (StreamWriter sw = new StreamWriter(stream))
{
//sw.WriteLine(string.Format("Content-Type: multipart/form-data; boundary=" + boundary.Replace("--", "")));
//sw.WriteLine();
//sw.Flush();
foreach (IPostDataField field in Fields)
{
sw.WriteLine("--" + boundary);
sw.Flush();
stream.Write(field.Export(), 0, (int)field.Export().Length);
}
//1 keer om het af te leren
//sw.WriteLine();
sw.WriteLine("--" + boundary + "--");
sw.Flush();
stream.Position = 0;
using (StreamReader sr = new StreamReader(stream))
{
string bla = sr.ReadToEnd();
stream.Position = 0;
Byte[] toExport = new Byte[stream.Length];
stream.Read(toExport, 0, (int)stream.Length);
return toExport;
}
}
}
}
}
【讨论】：
【讨论】：