在 mvvm 中为 uwp 分享 inkCanvas 问题

Question

我在使用 WTS 的 mvvm 工具包中有一个 UWP 应用程序，我共享 inkCanvas 的问题是我在以下内容中遇到错误：没有给出与所需的形式参数“数据”相对应的参数ShareSourceData.ShareDataService(DataPackage)' InkPen ViewModelsInkSmartCanvasViewModel.cs ShareDataAsync代码c#中提示错误

InkSmartCanvasViewModel.cs

私有异步任务 ShareDataAsync() {

    await  _shareSourceData?.ShareDataService();
}

public ICommand ShareCommand => shareCommand ?? (shareCommand = new RelayCommand(async () => await ShareDataAsync()));

ShareDataSource.cs

存储文件文件；私有只读 InkCanvas _inkCanvas; private RandomAccessStreamReference strokeStream;

public async Task ShareDataService(DataPackage data)
{
    file = await ApplicationData.Current.LocalFolder.CreateFileAsync("MyPen.png",
       Windows.Storage.CreationCollisionOption.ReplaceExisting);

    DataTransferManager dataTransferManager = DataTransferManager.GetForCurrentView();
    dataTransferManager.DataRequested += DataTransferManager_DataRequested;

    DataTransferManager.ShowShareUI();

}

private async void DataTransferManager_DataRequested(DataTransferManager sender, DataRequestedEventArgs args)
{
    DataRequest request = args.Request;
    DataRequestDeferral deferral = request.GetDeferral();
    using (var stream = await file.OpenAsync(FileAccessMode.ReadWrite))
    {
        await _inkCanvas.InkPresenter.StrokeContainer.SaveAsync(stream);
        strokeStream = RandomAccessStreamReference.CreateFromFile(file);
    }

    request.Data.SetBitmap(strokeStream);
    request.Data.Properties.Title = "InkPen";
    request.Data.Properties.Description = "send InkPen";

    await ShareDataService(args.Request.Data);
    deferral.Complete();

}

}

Answer 1

问题是您使用 0 个参数调用 ShareSourceData.ShareDataService，而函数声明它需要一个类型为 DataPackage 的参数。由于参数data 似乎没有被使用，你应该可以从函数中删除参数，即使用这个函数声明：

public async Task ShareDataService()
{
...
}