How to add custom file extension in Xamarin.Essentials file picker in all 3 platforms

Question

How to add custom file extension in Xamarin.Essentials file picker in all 3 platforms

Sk 66

I want to add custom file extension i.e. ".s37" in file picker filtering options. In UWP with the below code it is working fine but In android and ios not working

private async Task SelectFileClicked(object UTType)
        {
            var customFileType =
                new FilePickerFileType(new Dictionary<DevicePlatform, IEnumerable<string>>
                {
                { DevicePlatform.iOS, new[] {"s37" } },
                { DevicePlatform.Android, new[] { "s37" }},
                { DevicePlatform.UWP, new[] { "s37" } },
                });
            var file = await FilePicker.PickAsync(new PickOptions
            {
                FileTypes = customFileType,
                PickerTitle = "Pick an PDF"
            });
            if (file != null)
            {
                LblSelectedFileVisible = true;
                LblSelectedFileName = file.FileName;
              
            }
        }

Anonymous

2024-03-22T05:01:18.5533333+00:00
On Android platform, The FilePicker should use MIME type to find files with specific extension, such as:

{ DevicePlatform.Android, new[] { "application/andrew-inset" } },

You can refer to the MIME documentation to find all MIME types. For iOS platform. The FilePicker use MIME type, identifier, filename extension.

If you use custom file name(s37) extensions, you judge the file extension, if the filename end with s37, you can do some workload.

var result = await FilePicker.PickAsync(); if (result != null) { var Text = $"File Name: {result.FileName}"; if (result.FileName.EndsWith("s37", StringComparison.OrdinalIgnoreCase)) { // Process the s37 file } else { DisplayAlert("error","Please choose .s37 file","cancel"); } }
Sk 66 Reputation points

2024-03-26T08:45:16.38+00:00

Thanks @Anonymous

But I want to filter file type (extension) before picking only.

In the provided mime type list the format for .s37 is not listed
Anonymous

2024-03-27T08:40:01.4433333+00:00

But I want to filter file type (extension) before picking only.In the provided mime type list the format for .s37 is not listed

Yes .s37 do not include it. Please add a feature request in the Xamarin.Essential or MAUI Github repo
Sk 66 Reputation points

2024-03-28T11:01:08.3333333+00:00

Thanks @Anonymous

Is there any other way to do this?
Anonymous

2024-03-29T07:20:01.6666667+00:00

If you want to use Xamarin.Essential to do it, I afraid this answer is No.

Are these .S37 file install a specific folder?
Sk 66 Reputation points

2024-04-02T08:33:58.9133333+00:00

Can we do by using xam.plugin.filepicker nuget?
Anonymous

2024-04-03T05:31:28.5966667+00:00

That's a third-party plugin, we cannot guarantee if it works for your project.

You can open an issue in this third-party plugin or create a demo to make a test.

Your answer

Anonymous

2024-03-22T05:01:18.5533333+00:00

On Android platform, The FilePicker should use MIME type to find files with specific extension, such as:

{ DevicePlatform.Android, new[] { "application/andrew-inset" } },

You can refer to the MIME documentation to find all MIME types. For iOS platform. The FilePicker use MIME type, identifier, filename extension.

If you use custom file name(s37) extensions, you judge the file extension, if the filename end with s37, you can do some workload.

var result = await FilePicker.PickAsync(); if (result != null) { var Text = $"File Name: {result.FileName}"; if (result.FileName.EndsWith("s37", StringComparison.OrdinalIgnoreCase)) { // Process the s37 file } else { DisplayAlert("error","Please choose .s37 file","cancel"); } }
Sk 66 Reputation points

2024-03-26T08:45:16.38+00:00

Thanks @Anonymous

But I want to filter file type (extension) before picking only.

In the provided mime type list the format for .s37 is not listed
Anonymous

2024-03-27T08:40:01.4433333+00:00

But I want to filter file type (extension) before picking only.In the provided mime type list the format for .s37 is not listed

Yes .s37 do not include it. Please add a feature request in the Xamarin.Essential or MAUI Github repo
Sk 66 Reputation points

2024-03-28T11:01:08.3333333+00:00

Thanks @Anonymous

Is there any other way to do this?
Anonymous

2024-03-29T07:20:01.6666667+00:00

If you want to use Xamarin.Essential to do it, I afraid this answer is No.

Are these .S37 file install a specific folder?
Sk 66 Reputation points

2024-04-02T08:33:58.9133333+00:00

Can we do by using xam.plugin.filepicker nuget?
Anonymous

2024-04-03T05:31:28.5966667+00:00

That's a third-party plugin, we cannot guarantee if it works for your project.

You can open an issue in this third-party plugin or create a demo to make a test.

Share via

How to add custom file extension in Xamarin.Essentials file picker in all 3 platforms

Your answer