using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net;
using System.IO;
namespace WpfApplication1
{
public static class FormUpload
{
private static readonly Encoding encoding = Encoding.UTF8;
public static HttpWebResponse MultipartFormDataPost(string postUrl, string userAgent, Dictionary<string, object> postParameters)
{
string formDataBoundary = String.Format("----------{0:N}", Guid.NewGuid());
//string contentType = "multipart/form-data; boundary=" + formDataBoundary;
string contentType = "multipart/form-data; boundary=" + formDataBoundary;
byte[] formData = GetMultipartFormData(postParameters, formDataBoundary);
return PostForm(postUrl, userAgent, contentType, formData);
}
private static HttpWebResponse PostForm(string postUrl, string userAgent, string contentType, byte[] formData)
{
HttpWebRequest request = WebRequest.Create(postUrl) as HttpWebRequest;
if (request == null)
{
throw new NullReferenceException("request is not a http request");
}
// Set up the request properties.
request.Method = "POST";
request.ContentType = contentType;
request.UserAgent = userAgent;
request.CookieContainer = new CookieContainer();
request.ContentLength = formData.Length;
// You could add authentication here as well if needed:
// request.PreAuthenticate = true;
// request.AuthenticationLevel = System.Net.Security.AuthenticationLevel.MutualAuthRequested;
// request.Headers.Add("Authorization", "Basic " + Convert.ToBase64String(System.Text.Encoding.Default.GetBytes("username" + ":" + "password")));
// Send the form data to the request.
using (Stream requestStream = request.GetRequestStream())
{
requestStream.Write(formData, 0, formData.Length);
requestStream.Close();
}
return request.GetResponse() as HttpWebResponse;
}
private static byte[] GetMultipartFormData(Dictionary<string, object> postParameters, string boundary)
{
Stream formDataStream = new System.IO.MemoryStream();
bool needsCLRF = false;
foreach (var param in postParameters)
{
// Thanks to feedback from commenters, add a CRLF to allow multiple parameters to be added.
// Skip it on the first parameter, add it to subsequent parameters.
if (needsCLRF)
formDataStream.Write(encoding.GetBytes("\r\n"), 0, encoding.GetByteCount("\r\n"));
needsCLRF = true;
if (param.Value is FileParameter)
{
FileParameter fileToUpload = (FileParameter)param.Value;
// Add just the first part of this param, since we will write the file data directly to the Stream
string header = string.Format("--{0}\r\nContent-Disposition: form-data; name=\"{1}\"; filename=\"{2}\"\r\nContent-Type: {3}\r\n\r\n",
boundary,
param.Key,
fileToUpload.FileName ?? param.Key,
fileToUpload.ContentType ?? "application/octet-stream");
formDataStream.Write(encoding.GetBytes(header), 0, encoding.GetByteCount(header));
// Write the file data directly to the Stream, rather than serializing it to a string.
formDataStream.Write(fileToUpload.File, 0, fileToUpload.File.Length);
}
else
{
string postData = string.Format("--{0}\r\nContent-Disposition: form-data; name=\"{1}\"\r\n\r\n{2}",
boundary,
param.Key,
param.Value);
formDataStream.Write(encoding.GetBytes(postData), 0, encoding.GetByteCount(postData));
}
}
// Add the end of the request. Start with a newline
string footer = "\r\n--" + boundary + "--\r\n";
formDataStream.Write(encoding.GetBytes(footer), 0, encoding.GetByteCount(footer));
// Dump the Stream into a byte[]
formDataStream.Position = 0;
byte[] formData = new byte[formDataStream.Length];
formDataStream.Read(formData, 0, formData.Length);
formDataStream.Close();
return formData;
}
public class FileParameter
{
public byte[] File { get; set; }
public string FileName { get; set; }
public string ContentType { get; set; }
public FileParameter(byte[] file) : this(file, null) { }
public FileParameter(byte[] file, string filename) : this(file, filename, null) { }
public FileParameter(byte[] file, string filename, string contenttype)
{
File = file;
FileName = filename;
ContentType = contenttype;
}
}
}
}
Submit using wrapper class
Dictionary<string, object> postParameters = new Dictionary<string, object>();
postParameters.Add("token", "123465789");
//postParameters.Add("paramB", "value2");
//postParameters.Add("paramC", "value3");
byte[] data = ReadImageFile("c:\\123456.png");
postParameters.Add("file1", new FormUpload.FileParameter(data, "123456.png", "image/png"));
// Create request and receive response
string postURL = "http://localhost:4806/WebApi/V1/Account/ChangeUserCard";
string userAgent = "Someone";
HttpWebResponse webResponse = FormUpload.MultipartFormDataPost(postURL, userAgent, postParameters);
// Process response
StreamReader responseReader = new StreamReader(webResponse.GetResponseStream());
string fullResponse = responseReader.ReadToEnd();
Console.WriteLine(fullResponse);
Console.ReadKey();
Server accepts data
HttpRequest request = System.Web.HttpContext.Current.Request;
string token = request.Form["token"].ToString();
if (request.Files.Count <= 0) //If the number of file sets is less than or equal to 0, return an error
return ResponseResult.GenFaildResponse(ResultCode.CodeTypeIsNull);
foreach (string str in request.Files)
{
HttpPostedFile FileSave = request.Files[str]; //Get a single file object with key HttpPostedFile
string AbsolutePath = "C:\\" + FileSave.FileName; //Set the absolute path of the image to be saved
try
{
FileSave.SaveAs(AbsolutePath); //Save the uploaded things
}
catch
{
WebAPIHelper.RecordOperationLog("1111","1111");
}
}
Client form form submission (without image parameters)
string postData = "user=123&pass=456"; // data to be issued
byte[] byteArray = Encoding.UTF8.GetBytes(postData);
string url = "http://localhost:4806/WebApi/V1/Account/ChangeUserCard"; //Define the address to send the request
HttpWebRequest objWebRequest = (HttpWebRequest)WebRequest.Create(url);
objWebRequest.Method = "POST";
objWebRequest.ContentType = "application/x-www-form-urlencoded";
objWebRequest.ContentLength = byteArray.Length;
Stream newStream = objWebRequest.GetRequestStream();
// Send the data.
newStream.Write(byteArray, 0, byteArray.Length); //写入参数
newStream.Close();
HttpWebResponse response = (HttpWebResponse)objWebRequest.GetResponse();
StreamReader sr = new StreamReader(response.GetResponseStream(), Encoding.Default);
string textResponse = sr.ReadToEnd(); // returned data
convert image to binary
private static byte[] ReadImageFile(string path)
{
FileStream fs = File.OpenRead(path); //OpenRead
int filelength = 0;
filelength = (int)fs.Length; //Get the file length
Byte[] image = new Byte[filelength]; //Create a byte array
fs.Read(image, 0, filelength); //read by byte stream
System.Drawing.Image img = System.Drawing.Image.FromStream(fs);
return ImgHelper.ImageToBytes(img);
//Console.WriteLine(array.ToString());
//Console.ReadKey();
}
Remarks:
1. Encapsulation class and request method, refer to: http://blog.csdn.net/wangjijun0807/article/details/40053679?locationNum=15
2. The ResponseResult statement received by the server can be ignored
3. Send post with pictures In the requested method, the processing method of the image is placed at the end