public override async Task <StorageFile> CreateFileAsync(string desiredName, CreationCollisionOption option, CancellationToken cancellationToken)
{
var actualName = desiredName;
var existingItem = await TryGetItemAsync(desiredName, cancellationToken);
switch (option)
{
case CreationCollisionOption.ReplaceExisting:
if (existingItem is StorageFolder)
{
throw new UnauthorizedAccessException("There is already a folder with the same name.");
}
if (existingItem is StorageFile)
{
// Delete existing file
await existingItem.DeleteAsync();
}
break;
case CreationCollisionOption.FailIfExists:
if (existingItem != null)
{
throw new UnauthorizedAccessException("There is already an item with the same name.");
}
break;
case CreationCollisionOption.OpenIfExists:
if (existingItem is StorageFile existingFile)
{
return(existingFile);
}
if (existingItem is StorageFolder)
{
throw new UnauthorizedAccessException("There is already a file with the same name.");
}
break;
case CreationCollisionOption.GenerateUniqueName:
actualName = await FindAvailableNumberedFileNameAsync(desiredName);
break;
default:
throw new ArgumentOutOfRangeException(nameof(option));
}
var newFolderNativeInfo = await WebAssemblyRuntime.InvokeAsync($"{JsType}.createFileAsync(\"{_id}\", \"{WebAssemblyRuntime.EscapeJs(actualName)}\")");
if (newFolderNativeInfo == null)
{
throw new UnauthorizedAccessException("Could not create file.");
}
var info = JsonHelper.Deserialize <NativeStorageItemInfo>(newFolderNativeInfo);
return(StorageFile.GetFromNativeInfo(info, Owner));
}
public override async Task <IReadOnlyList <StorageFile> > GetFilesAsync(CancellationToken ct)
{
var itemInfosJson = await WebAssemblyRuntime.InvokeAsync($"{JsType}.getFilesAsync(\"{_id}\")");
var itemInfos = JsonHelper.Deserialize <NativeStorageItemInfo[]>(itemInfosJson);
var results = new List <StorageFile>();
foreach (var info in itemInfos)
{
results.Add(StorageFile.GetFromNativeInfo(info));
}
return(results.AsReadOnly());
}
public override async Task <StorageFile> GetFileAsync(string name, CancellationToken token)
{
var fileInfoJson = await WebAssemblyRuntime.InvokeAsync($"{JsType}.tryGetFileAsync(\"{_id}\", \"{WebAssemblyRuntime.EscapeJs(name)}\")");
if (fileInfoJson == null)
{
throw new FileNotFoundException($"There is no file with name '{name}'.");
}
// File exists
var fileInfo = JsonHelper.Deserialize <NativeStorageItemInfo>(fileInfoJson);
return(StorageFile.GetFromNativeInfo(fileInfo, Owner));
}
public override async Task <IStorageItem?> TryGetItemAsync(string name, CancellationToken token)
{
var fileInfoJson = await WebAssemblyRuntime.InvokeAsync($"{JsType}.tryGetFileAsync(\"{_id}\", \"{WebAssemblyRuntime.EscapeJs(name)}\")");
if (fileInfoJson != null)
{
// File exists
var fileInfo = JsonHelper.Deserialize <NativeStorageItemInfo>(fileInfoJson);
return(StorageFile.GetFromNativeInfo(fileInfo, Owner));
}
var folderInfoJson = await WebAssemblyRuntime.InvokeAsync($"{JsType}.tryGetFolderAsync(\"{_id}\", \"{WebAssemblyRuntime.EscapeJs(name)}\")");
if (folderInfoJson != null)
{
// Folder exists
var folderInfo = JsonHelper.Deserialize <NativeStorageItemInfo>(folderInfoJson);
return(GetFromNativeInfo(folderInfo, Owner));
}
return(null);
}