AngularJS Upload MuItiple Files (Images) using Angular File Upload in Asp.net

By: Suresh Dasari Jun 20, 2016

Introduction:

Here I will explain how to upload files / images using angularjs example in asp.net or angularjs upload multiple files / images with progress example in asp.net using file upload module or File upload module in angularjs to upload multiple files / images in asp.net using c#, vb.net. In angularjs by using file upload module and html5 property “multiple” we can implement uploading multiple files / images in asp.net.

Description:

In previous articles I explained jQuery upload multiple files in asp.net with handler, jQuery upload multiple files using multiple file upload plugin, jQuery multiple files upload with progress in asp.net, asp.net download multiple files as zip folder with example, 7 + jQuery multiple fileupload plugin examples and many articles relating to angularjs, jQuery, JavaScript and asp.net. Now I will explain how to upload multiple files / images using angularjs with generic handler (ashx) in asp.net using c#, vb.net.

To upload multiples files using angularjs in asp.net we are going to use angularjs file upload module. First create new web application and open Default.aspx page and write the following code

<title>AngularJS Upload Images using File Upload Plugin</title>

//inject angular file upload directives and services.

var app = angular.module('fileUpload', ['ngFileUpload']);

app.controller('MyCtrl', ['$scope', 'Upload', '$timeout', function ($scope, Upload, $timeout) {

$scope.uploadPic = function(file) {

file.upload = Upload.upload({

url: 'UploadHandler.ashx',

data: {file: file}

});

file.upload.then(function (response) {

$timeout(function () {

file.result = response.data;

});

}, function (response) {

if (response.status > 0)

$scope.errorMsg = response.status + ': ' + response.data;

}, function (evt) {

// Math.min is to fix IE which reports 200% sometimes

file.progress = Math.min(100, parseInt(100.0 * evt.loaded / evt.total));

});

}

}]);

</script>

form .progress {

line-height: 15px;

}

.progress {

display: inline-block;

width: 100px;

border: 3px groove #CCC;

}

.progress div {

font-size: smaller;

background: orange;

width: 0;

}

</style>

</head>

<h3>AngularJS Upload Multiple Files</h3>

Upload:

<input type="file" ngf-select ng-model="picFile" name="file" multiple accept="image/*" ngf-max-size="2MB" required

ngf-model-invalid="errorFile">

<i ng-show="myForm.file.$error.required">*required</i><br>

<i ng-show="myForm.file.$error.maxSize">File too large

{{errorFile.size / 1000000|number:1}}MB: max 2M</i>

<br>

<button ng-disabled="!myForm.$valid" ng-click="uploadPic(picFile)">Submit</button><br />

<div style="width:{{picFile.progress}}%"

ng-bind="picFile.progress + '%'"></div>

</span>

<span ng-show="picFile.result">Upload Successful</span>

<span class="err" ng-show="errorMsg">{{errorMsg}}</span>

</form>

</body>

</html>

If you observe above code in header section we added “ng-file-upload-shim.min.js” and “ng-file-upload.min.js” file reference you can get those two files from this link angularjs file upload module or you can download from attached folder.

Here we added these references to upload files to folder and we can implement validation for file upload control and add restriction to allow only 2MB files to upload by using angularjs file upload module.

In angularjs uploadPic method we mentioned “UploadHandler.ashx” by using this we can upload files in server side. Now we will add handler file in our application by following below steps

Right click on your application à select Add New Item à select Generic Handler file à Give a name and click Add button like as shown below

Once you finished adding handler file now add new folder in your application “uploads” that would be like as shown below

Now open UploadHandler.ashx file and write the following code

C# Code

<%@ WebHandler Language="C#" Class="UploadHandler" %>

using System;

using System.Web;

using System.IO;

public class UploadHandler : IHttpHandler {

public void ProcessRequest (HttpContext context) {

if (context.Request.Files.Count > 0)

{

HttpFileCollection files = context.Request.Files;

for (int i = 0; i < files.Count; i++)

{

HttpPostedFile file = files[i];

string fname;

if (HttpContext.Current.Request.Browser.Browser.ToUpper() == "IE" || HttpContext.Current.Request.Browser.Browser.ToUpper() == "INTERNETEXPLORER")

{

string[] testfiles = file.FileName.Split(new char[] { '\\' });

fname = testfiles[testfiles.Length - 1];

}

else

{

fname = file.FileName;

}

fname=Path.Combine(context.Server.MapPath("~/uploads/"), fname);

file.SaveAs(fname);

}

context.Response.ContentType = "text/plain";

context.Response.Write("File Uploaded Successfully!");

}

public bool IsReusable {

get {

return false;

}

VB.NET Code

<%@ WebHandler Language="VB" Class="Handler" %>

Imports System.Web

Imports System.IO

Public Class Handler : Implements IHttpHandler

Public Sub ProcessRequest(ByVal context As HttpContext) Implements IHttpHandler.ProcessRequest

If context.Request.Files.Count > 0 Then

Dim files As HttpFileCollection = context.Request.Files

For i As Integer = 0 To files.Count - 1

Dim file As HttpPostedFile = files(i)

Dim fname As String

If HttpContext.Current.Request.Browser.Browser.ToUpper() = "IE" OrElse HttpContext.Current.Request.Browser.Browser.ToUpper() = "INTERNETEXPLORER" Then

Dim testfiles As String() = file.FileName.Split(New Char() {"\"c})

fname = testfiles(testfiles.Length - 1)

Else

fname = file.FileName

End If

fname = Path.Combine(context.Server.MapPath("~/uploads/"), fname)

file.SaveAs(fname)

context.Response.ContentType = "text/plain"

context.Response.Write("File Uploaded Successfully!")

End Sub

Public ReadOnly Property IsReusable() As Boolean Implements IHttpHandler.IsReusable

Get