C # analog multi-File upload

Original address: http://www.cnblogs.com/greenerycn/archive/2010/05/15/csharp_http_post.html

1, the client code is written with WinForm

Private voidButton1_Click (Objectsender, EventArgs e) {    stringPostURL ="http://localhost:40694/test1/Handler1.ashx"; string[] files = {"F:\\1.png","F:\\2.png" }; stringstr =httpuploadfile (posturl, files); MessageBox.Show (str);} Public stringHttpuploadfile (stringUrlstring[] files) {    //HttpContext context//refer to http://www.cnblogs.com/greenerycn/archive/2010/05/15/csharp_http_post.html    varMemstream =NewMemoryStream (); //Boundary character    varBoundary ="---------------"+ DateTime.Now.Ticks.ToString ("x"); varBeginboundary = Encoding.ASCII.GetBytes ("--"+ Boundary +"\ r \ n"); //File parameter Header    foreach(varIteminchfiles) {        stringFilePath =item; stringFileName =path.getfilename (item); varFileStream =NewFileStream (FilePath, FileMode.Open, FileAccess.Read); varFileheaderbytes = Encoding.UTF8.GetBytes ($"content-disposition:form-data; name=\ "{"File"}\"; Filename=\ "{filename}\" \r\ncontent-type:application/octet-stream\r\n\r\n"); //Start spelling DataMemstream.write (Beginboundary,0, beginboundary.length); //File DataMemstream.write (Fileheaderbytes,0, fileheaderbytes.length); varBuffer =New byte[1024x768]; intBytesread;  while(Bytesread = filestream.read (buffer,0, buffer. Length))! =0) {memstream.write (buffer,0, Bytesread);        } filestream.close (); //you have to write a newline.        byte[] bytes = Encoding.UTF8.GetBytes ($"\ r \ n"); Memstream.write (Bytes,0, Bytes.    Length); }    ////Key-value Data    //dictionary<string, string> stringdict = new dictionary<string, string> (); //Stringdict.add ("Len", "500"); //Stringdict.add ("Wid", "300"); //Stringdict.add ("Test1", "1"); //foreach (var item in stringdict)//{    //String name = Item.    Key; //String value = Item.    Value; //byte[] bytes = Encoding.UTF8.GetBytes ($ "\r\n--{boundary}\r\ncontent-disposition:form-data; name=\" {name}\ "\r\    N\r\n{value}\r\n "); //memstream.write (bytes, 0, bytes.    Length); //}    //writes the last end of the bounding character    varEndboundary = Encoding.ASCII.GetBytes ("--"+ Boundary +"--\r\n");//the last TerminatorMemstream.write (Endboundary,0, endboundary.length); //Write to TempbufferMemstream.position =0; varTempbuffer =New byte[Memstream.length]; Memstream.read (Tempbuffer,0, tempbuffer.length);    Memstream.close (); //create WebRequest and set properties    varWebRequest =(HttpWebRequest) webrequest.create (URL); Webrequest.method="POST"; Webrequest.timeout=100000; Webrequest.contenttype="multipart/form-data; boundary="+boundary; Webrequest.contentlength=tempbuffer.length; varRequeststream =Webrequest.getrequeststream (); requestStream.Write (Tempbuffer,0, tempbuffer.length);    Requeststream.close (); varHttpWebResponse =(HttpWebResponse) webrequest.getresponse (); stringresponsecontent; using(varHttpstreamreader =NewStreamReader (Httpwebresponse.getresponsestream (), Encoding.GetEncoding ("Utf-8")) {responsecontent=Httpstreamreader.readtoend ();    } httpwebresponse.close ();    Webrequest.abort (); returnresponsecontent;}

2. Service-side code

  Public classHandler1:ihttphandler { Public voidProcessRequest (HttpContext context) {context. Response.ContentType="Text/plain"; stringStrfilenames =""; if(Context. Request.Files.Count >0)            {                 for(inti =0; I < context. Request.Files.Count; i++) {Httppostedfile _httppostedfile=context.                    Request.files[i]; Strfilenames+ = _httppostedfile.filename +","; _httppostedfile.saveas (context. Server.MapPath ($"./{_httppostedfile.filename}")); }                //context. Response.Write ($ "files:{context. Request.Files.Count} filenames:{strfilenames} ");            }            //context. Response.Write (context.            request.form["Len"]); //context. Response.Write (Jsonconvert.serializeobject) (context. Request.Form.AllKeys.Length.ToString ()));context.        Response.Write (Strfilenames); }         Public BOOLisreusable {Get            {                return false; }        }    }

C # analog multi-File upload