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FileUpload

in namespace DotVVM.Framework.Controls

Renders a FileUpload control allowing users to upload one or multiple files asynchronously.

Usage & Scenarios

Allows the user to upload one or multiple files asynchronously.

Processing uploaded files

The FileUpload control requires a property of type UploadedFilesCollection in the viewmodel.

See Upload files for more info about processing the uploaded files.

Sample 1: Basic FileUpload control

The FileUpload control has the UploadedFiles property (of type UploadedFilesCollection). Each file will get a unique ID which is stored in this collection.

The AllowMultipleFiles property specifies whether the user can select multiple files in the file browser window.

page.dothtml
ViewModel.cs

<dot:FileUpload UploadedFiles="{value: Files}" AllowMultipleFiles="true" />

using System.Collections.Generic;
using DotVVM.Framework.Controls;

namespace DotvvmWeb.Views.Docs.Controls.builtin.FileUpload.sample1
{
    public class ViewModel
    {
        public UploadedFilesCollection Files { get; set; }


        public ViewModel()
        {
            Files = new UploadedFilesCollection();
        }
        
    }
}

Sample 2: UploadCompleted Event

The UploadCompleted event is fired automatically when file is uploaded.

page.dothtml
ViewModel.cs

<dot:FileUpload UploadedFiles="{value: Files}" AllowMultipleFiles="true" 
                UploadCompleted="{command: ProcessFile()}" />

{{value: Message}}

using System.Collections.Generic;
using DotVVM.Framework.Controls;

namespace DotvvmWeb.Views.Docs.Controls.builtin.FileUpload.sample2
{
    public class ViewModel
    {
        public UploadedFilesCollection Files { get; set; }

        public string Message { get; set; }

        public ViewModel()
        {
            Files = new UploadedFilesCollection();
        }

        public void ProcessFile()
        {
            // do what you have to do with the uploaded files
            Message = "ProcessFile() was called.";
        }
    }
}

Sample 3: Processing the Files

You can use the Files.IsBusy property to determine whether the upload is still in progress or not.

page.dothtml
ViewModel.cs

<dot:FileUpload UploadedFiles="{value: Files}" 
                AllowMultipleFiles="true" />
<p>
  <dot:Button Text="Save Files" 
              Click="{command: Process()}"
              Enabled="{value: !Files.IsBusy}" />
</p>

using System.IO;
using System.Threading.Tasks;
using DotVVM.Framework.Controls;
using DotVVM.Core.Storage;
using DotVVM.Framework.ViewModel;

namespace DotvvmWeb.Views.Docs.Controls.builtin.FileUpload.sample3
{
    public class ViewModel : DotvvmViewModelBase
    {
        private IUploadedFileStorage storage;
        
        public UploadedFilesCollection Files { get; set; }


        public ViewModel(IUploadedFileStorage storage)
        {
            // use dependency injection to request IUploadedFileStorage
            this.storage = storage;
            
            Files = new UploadedFilesCollection();
        }


        public async Task Process()
        {
            var uploadPath = GetUploadPath();

            // save all files to disk
            foreach (var file in Files.Files)
            {
                var targetPath = Path.Combine(uploadPath, file.FileId + ".bin");
                await storage.SaveAsAsync(file.FileId, targetPath);
                await storage.DeleteFileAsync(file.FileId);
            }

            // clear the uploaded files collection so the user can continue with other files
            Files.Clear();
        }

        private string GetUploadPath()
        {
            var uploadPath = Path.Combine(Context.Configuration.ApplicationPhysicalPath, "MyFiles");
            if (!Directory.Exists(uploadPath))
            {
                Directory.CreateDirectory(uploadPath);
            }
            return uploadPath;
        }
    }
}

Show all inherited properties

Properties

Name	Type	Description	Notes	Default Value
AllowedFileTypes	String	Gets or sets the types of files that the server accepts. It must be a comma-separated list of unique content type specifiers (eg. ".jpg,image/png,audio/*"). All file types are allowed by default.	attribute inner element static value bindable default	null
AllowMultipleFiles	Boolean	Gets or sets whether the user can select multiple files at once. It is enabled by default.	attribute inner element static value bindable default	True
Attributes	Dictionary<String,Object>		attribute inner element static value bindable default	null
ClientIDMode	ClientIDMode	Gets or sets the client ID generation algorithm.	attribute inner element static value bindable default	Static
DataContext	Object	Gets or sets a data context for the control and its children. All value and command bindings are evaluated in context of this value.	attribute inner element static value bindable default	null
ID	String	Gets or sets the unique control ID.	attribute inner element static value bindable default	null
IncludeInPage	Boolean	Gets or sets whether the control is included in the DOM of the page.	attribute inner element static value bindable default	True
InnerText	String	Gets or sets the inner text of the HTML element.	attribute inner element static value bindable default	null
MaxFileSize	Int32?	Gets or sets the maximum size of files in megabytes (MB). The size is not limited by default.	attribute inner element static value bindable default	null
NumberOfFilesIndicatorText	String	Gets or sets the text on the indicator showing number of files. The default value is "{0} files". The number of files will be substituted for the "{0}" placeholder.	attribute inner element static value bindable default	{0} files
SuccessMessageText	String	Gets or sets the text that appears when all files are uploaded successfully.	attribute inner element static value bindable default	The files were uploaded successfully.
UploadButtonText	String	Gets or sets the text on the upload button. The default value is "Upload".	attribute inner element static value bindable default	Upload
UploadedFiles	UploadedFilesCollection	Gets or sets a collection of uploaded files.	attribute inner element static value bindable default	null
UploadErrorMessageText	String	Gets or sets the text that appears when there is an error during the upload.	attribute inner element static value bindable default	Error occurred.
Visible	Boolean	Gets or sets whether the control is visible.	attribute inner element static value bindable default	True

Events

	Name	Type	Description
	UploadCompleted	Command	Gets or sets a command that is triggered when the upload is complete.