private async Task <StorageFolder?> PickSingleFolderTaskAsync(CancellationToken token)
{
if (!IsNativePickerSupported())
{
throw new NotSupportedException("Could not handle the request using any picker implementation.");
}
var id = WebAssemblyRuntime.EscapeJs(SettingsIdentifier);
var startIn = SuggestedStartLocation.ToStartInDirectory();
var pickedFolderJson = await WebAssemblyRuntime.InvokeAsync($"{JsType}.pickSingleFolderAsync('{id}','{startIn}')");
if (pickedFolderJson is null)
{
// User did not select any folder.
return(null);
}
var info = JsonHelper.Deserialize <NativeStorageItemInfo>(pickedFolderJson);
return(StorageFolder.GetFromNativeInfo(info, null));
}
private async Task <StorageFile?> NativePickerPickSaveFileAsync(CancellationToken token)
{
var showAllEntryParameter = "true";
var fileTypeMapParameter = JsonHelper.Serialize(BuildFileTypesMap());
var suggestedFileName = SuggestedFileName != "" ? WebAssemblyRuntime.EscapeJs(SuggestedFileName) : "";
var id = WebAssemblyRuntime.EscapeJs(SettingsIdentifier);
var startIn = SuggestedStartLocation.ToStartInDirectory();
var promise = $"{JsType}.nativePickSaveFileAsync({showAllEntryParameter},'{WebAssemblyRuntime.EscapeJs(fileTypeMapParameter)}','{suggestedFileName}','{id}','{startIn}')";
var nativeStorageItemInfo = await WebAssemblyRuntime.InvokeAsync(promise);
if (nativeStorageItemInfo is null)
{
return(null);
}
var info = JsonHelper.Deserialize <NativeStorageItemInfo>(nativeStorageItemInfo);
return(StorageFile.GetFromNativeInfo(info));
}
private async Task <FilePickerSelectedFilesArray> NativePickerPickFilesAsync(bool multiple, CancellationToken token)
{
var showAllEntryParameter = FileTypeFilter.Contains("*") ? "true" : "false";
var multipleParameter = multiple ? "true" : "false";
var fileTypeAcceptTypes = BuildFileTypesMap();
var fileTypeAcceptTypesJson = JsonHelper.Serialize(fileTypeAcceptTypes);
var fileTypeMapParameter = WebAssemblyRuntime.EscapeJs(fileTypeAcceptTypesJson);
var id = WebAssemblyRuntime.EscapeJs(SettingsIdentifier);
var startIn = SuggestedStartLocation.ToStartInDirectory();
var nativeStorageItemInfosJson = await WebAssemblyRuntime.InvokeAsync($"{JsType}.nativePickFilesAsync({multipleParameter},{showAllEntryParameter},'{fileTypeMapParameter}','{id}','{startIn}')");
var infos = JsonHelper.Deserialize <NativeStorageItemInfo[]>(nativeStorageItemInfosJson);
var results = new List <StorageFile>();
foreach (var info in infos)
{
var storageFile = StorageFile.GetFromNativeInfo(info);
results.Add(storageFile);
}
return(new FilePickerSelectedFilesArray(results.ToArray()));
}