Getting Started with ASP.NET Core Uploader Control

6 May 20225 minutes to read

This section briefly explains about how to include ASP.NET Core Uploader control in your ASP.NET Core application using Visual Studio.

Prerequisites

System requirements for ASP.NET Core controls

Create ASP.NET Core web application with Razor pages

Install ASP.NET Core package in the application

Syncfusion ASP.NET Core controls are available in nuget.org. Refer to NuGet packages topic to learn more about installing NuGet packages in various OS environments. To add ASP.NET Core controls in the application, open the NuGet package manager in Visual Studio (Tools → NuGet Package Manager → Manage NuGet Packages for Solution), search for Syncfusion.EJ2.AspNet.Core and then install it.

The Syncfusion.EJ2.AspNet.Core NuGet package has dependencies, Newtonsoft.Json for JSON serialization and Syncfusion.Licensing for validating Syncfusion license key.

Add Syncfusion ASP.NET Core Tag Helper

Open ~/Views/_ViewImports.cshtml file and import the Syncfusion.EJ2 TagHelper.

@addTagHelper *, Syncfusion.EJ2

Add style sheet

Checkout the Themes topic to learn different ways (CDN, NPM package, and CRG) to refer styles in ASP.NET Core application, and to have the expected appearance for Syncfusion ASP.NET Core controls. Here, the theme is referred using CDN inside the <head> of ~/Pages/Shared/_Layout.cshtml file as follows,

<head>
    ...
    <!-- Syncfusion ASP.NET Core controls styles -->
    <link rel="stylesheet" href="https://cdn.syncfusion.com/ej2/20.3.56/fluent.css" />
</head>

Add script reference

In this getting started walk-through, the required scripts are referred using CDN inside the <head> of ~/Pages/Shared/_Layout.cshtml file as follows,

<head>
    ...
    <!-- Syncfusion ASP.NET Core controls scripts -->
    <script src="https://cdn.syncfusion.com/ej2/20.3.56/dist/ej2.min.js"></script>
</head>

Register Syncfusion Script Manager

Open ~/Pages/Shared/_Layout.cshtml page and register the script manager at the end of `<body>` in the ASP.NET Core application as follows.

<body>
    ....
    ....
    <!-- Syncfusion ASP.NET Core Script Manager -->
    <ejs-scripts></ejs-scripts>
</body>

Add ASP.NET Core Uploader control

Now, add the Syncfusion ASP.NET Core Uploader tag helper in ~/Pages/Index.cshtml page.

From v16.2.41 version, the Essential JS2 AJAX library has been integrated for uploader server requests.
Hence, use the third party promise library like blue-bird to use the uploader in Internet Explorer.

<ejs-uploader id="uploadFiles" autoUpload="false"></ejs-uploader>

Press Ctrl+F5 (Windows) or +F5 (macOS) to run the app. Then, the Syncfusion ASP.NET Core Uploader control will be rendered in the default web browser.

ASP.NET Core Uploader Control

Adding drop area

By default, the uploader control allows to upload files by drag the files from file explorer, and drop into the drop area. You can configure any other external element as drop target using dropArea property.

In the following sample, drop target is configured.

<div id='droparea'>Drop files here to upload</div>

<ejs-uploader id="uploadFiles" dropArea="#droparea" autoUpload="false"></ejs-uploader>

<style>
    .fileupload {
        margin: 20px auto;
        width: 400px;
    }

    #droparea {
        padding: 50px 25px;
        margin: 30px auto;
        border: 1px solid #c3c3c3;
        text-align: center;
        width: 20%;
        display: inline-flex;
    }

    .e-file-select,
    .e-file-drop {
        display: none;
    }

    body .e-upload-drag-hover {
        outline: 2px dashed brown;
    }

    #uploadfile {
        width: 60%;
        display: inline-flex;
        margin-left: 5%;
    }
</style>

Configure asynchronous settings

The uploader control process the files to upload in Asynchronous mode by default. Define the properties saveUrl and removeUrl to handle the save and remove action as follows.

@{
    var asyncSettings = new Syncfusion.EJ2.Inputs.UploaderAsyncSettings { SaveUrl = "https://ej2.syncfusion.com/services/api/uploadbox/Save", RemoveUrl = "https://ej2.syncfusion.com/services/api/uploadbox/Remove" };
}

<ejs-uploader id="uploadFiles" asyncSettings="@asyncSettings" autoUpload="false"></ejs-uploader>

Handle success and failed upload

You can handle the success and failure actions using the success and failure events. To handle these events, define the function and assign it to the corresponding event as follows.

@{
    var asyncSettings = new Syncfusion.EJ2.Inputs.UploaderAsyncSettings { SaveUrl = "https://ej2.syncfusion.com/services/api/uploadbox/Save", RemoveUrl = "https://ej2.syncfusion.com/services/api/uploadbox/Remove" };
}
<ejs-uploader id="uploadFiles" asyncSettings="@asyncSettings" success="onUploadSuccess" failure="onUploadFailure" autoUpload="false"></ejs-uploader>
<script>
    function onUploadSuccess(args) {
        if (args.operation === 'upload') {
            console.log('success');
        }
    }
    function onUploadFailure(args) {
        console.log('failed');
    }
</script>

ASP.NET Core Uploader

View Sample in GitHub.

See also