private async Task <StorageFile?> DownloadPickerPickSaveFileAsync(CancellationToken token)
{
if (SuggestedSaveFile == null)
{
var temporaryFolder = ApplicationData.Current.LocalCacheFolder;
if (!Directory.Exists(temporaryFolder.Path))
{
temporaryFolder.MakePersistent();
}
if (string.IsNullOrEmpty(SuggestedFileName))
{
SuggestedFileName = Guid.NewGuid().ToString();
}
var extension = FileTypeChoices.Count > 0 ? FileTypeChoices.First().Value[0] : "";
// The mime type is chosen by the extension, and we cannot reliably send multiple mime type in the browser
var fileName = SuggestedFileName + extension;
SuggestedSaveFile = await temporaryFolder.CreateFileAsync(fileName, CreationCollisionOption.ReplaceExisting);
SuggestedSaveFile.ProviderOverride = StorageProviders.WasmDownloadPicker;
}
return(SuggestedSaveFile);
}
private string[] GetMimeTypes()
{
return(FileTypeChoices
.SelectMany(choice => choice.Value)
.Select(extension => MimeTypeService.GetFromExtension(extension))
.Distinct()
.ToArray());
}
private async Task <StorageFile?> DownloadPickerPickSaveFileAsync(CancellationToken token)
{
if (SuggestedSaveFile == null)
{
var temporaryFolder = ApplicationData.Current.LocalCacheFolder;
if (!Directory.Exists(temporaryFolder.Path))
{
temporaryFolder.MakePersistent();
}
// The mime type is chosen by the extension, and we cannot reliably send multiple mime type in the browser
var fileName = SuggestedFileName + FileTypeChoices.First().Value[0];
SuggestedSaveFile = await temporaryFolder.CreateFileAsync(fileName, CreationCollisionOption.ReplaceExisting);
}
return(SuggestedSaveFile);
}
private string[] GetFileTypes() => FileTypeChoices.SelectMany(x => x.Value.Select(val => val.TrimStart(new[] { '.' }))).ToArray();
