DxUpload.AllowedFileExtensions Property

Specifies file extensions that the Upload component accepts.

Namespace: DevExpress.Blazor

Assembly: DevExpress.Blazor.v24.2.dll

NuGet Package: DevExpress.Blazor

Declaration

[Parameter]
public List<string> AllowedFileExtensions { get; set; }

Property Value

Type	Description
List<String>	A list of allowed file extensions.

Remarks

Use the AllowedFileExtensions property to restrict extensions of files that users can upload.

Razor

<DxUpload Name="myFile" UploadUrl="https://localhost:10000/api/Upload/Upload/"
          AllowedFileExtensions="@(new List<string> { ".jpg", ".jpeg", ".gif", ".png" })">
</DxUpload>

UploadController

using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;

namespace BlazorDemo.AspNetCoreHost;
[Route("api/[controller]")]
[ApiController]
public class UploadController : ControllerBase {
    [HttpPost("[action]")]
    public ActionResult Upload(IFormFile myFile) {
        try {
            // Write code that saves the 'myFile' file.
            // Don't rely on or trust the FileName property without validation.
        } catch {
            return BadRequest();
        }
        return Ok();
    }
}

Once a user selected or dropped a file, the Upload validates the file’s extension on the client. If the extension is not allowed, the Upload displays an error.

Note

The AllowedFileExtensions property does not affect the Open File dialog’s filter.

Use the AcceptedFileTypes property to filter files in the Open File dialog. You can specify allowed file types (image, video, etc.) and/or individual file extensions.

For more information on server-side validation, refer to Server-Side Validation.

Run Demo: Upload - Validation