Upload and download of. NET Core Files

1. Preface

File import and export is a simple and common function, the following example implements the file upload and download several methods, if there is something wrong, please correct me. Small white one, moving toward the target.

2.1. File upload--Pure file

1 <formAction= "/home/index"Method= "POST"enctype= "Multipart/form-data" > 2     <inputtype= "File"multiple/>3     <inputID= "Upload"type= "Submit" />4 </form>

1 [HttpPost]2          Publiciactionresult Index (list<iformfile> files)3         {4            5             foreach(varFileinch files)6             {7                 //Get file name8                 varFileName =file. FileName;9                 //save under the Wwwroot folderTenFileName = Hostingenv.webrootpath + $"\\{filename}"; A                 using(FileStream fs =System.IO.File.Create (fileName)) -                 { - file. CopyTo (FS); the FS. Flush (); -                 } -             } -             returnView (); +}

2.2. File upload-multi-type content upload

For a form that is not just a file, you can use model binding.

 <FormAction= "/home/index"Method= "POST"Enctype= "Multipart/form-data">
 <input type= "file"  Multiple/> 
      <input type= "text"  name= "name" /> 
 <input id= "upload"  Type= "submit" /> 
  </form>    

        /// <summary>        ///form upload file/// </summary>        /// <param name= "Files" ></param>        /// <returns></returns>[HttpPost] Publiciactionresult Index (Formobject obj) {foreach(varFileinchobj. Files) {//Get file name                varFileName =Contentdispositionheadervalue. Parse (file. contentdisposition). FileName. Trim ('"'); FileName= Hostingenv.webrootpath + $"\\{filename}"; using(FileStream fs =System.IO.File.Create (FileName)) {file.                    CopyTo (FS); Fs.                Flush (); }            }            returnView (); }

// Model Class  Public class formobject{       publicgetset;}         Public string Get Set ; }}

2.3. File upload--Ajax upload

    <inputtype= "text"name= "Name"value= "123"/>        <inputtype= "File"ID= "FileUpload"name= "FileUpload"multiple/>    <inputID= "Upload"type= "button"value= "Ajax Commit"/>

<script type= "Text/javascript" >    $(function () {        $("#upload"). Click (function(evt) {///Take selected files to join Formdata            varFileUpload = $ ("#fileUpload"). Get (0); varFiles =Fileupload.files; vardata =NewFormData ();  for(vari = 0; i < files.length; i++) {data.append (Files[i].name, files[i]); }           //data.append ("name", $ (' input[name= "name"] "). Val ())$.ajax ({type:"POST", URL:"Http://192.168.0.175:8095/api/Organization", ContentType:false, ProcessData:false, Data:data, success:function(message) {alert (message); }, Error:function() {alert ("There was an error uploading the file! ");        }            });    }); });</script>

        /// <summary>        ///uploading via Ajax/// </summary>        /// <returns></returns>         PublicIactionresult uploadfiles () {varFiles =Request.Form.Files; varValue =request.form.first (c = C.key = ="Name"). value;//getting form text Itemsforeach(varFileinchfiles) {                varFileName =file. FileName;FileName = Hostingenv.webrootpath + $@"\{filename}";using(FileStream fs =System.IO.File.Create (FileName)) {file.                    CopyTo (FS); Fs.                Flush (); }            }            returnRedirecttoaction ("/export",New{Title ="1", Name =123}); }

3.3. File download

1 [HttpGet]2          Publiciactionresult exporttext ()3         {4            5             stringsFileName = $@"qmhuangtext{datetime.now.tostring ("Yyyymmddhhmmss")}.txt";6FileStream fs =NewFileStream (sfilename,filemode.openorcreate);7StreamWriter SW =NewStreamWriter (FS);8Sw. WriteLine ("Hello World");9 SW. Flush ();Ten SW. Close (); One FS. Close (); A             returnFile (NewFileStream (sFileName, FileMode.Open),"Application/octet-stream", $"Export Test {DateTime.Now.ToString ("Yyyymmddhhmmss")}.txt"); -}

Upload and download of. NET Core Files