使用后台工作器时丢失 UI 功能

Question

我对使用不同的线程和使用BackgroundWorker 很陌生，所以我还没有完全理解所有内容。我已经发布了我从下面程序的客户端获得的所有编码。

问题是，即使我使用 BackgroundWorker，当我从 WCF 服务加载数据时，我仍然会失去所有 UI 的功能到我的 WPF 客户端应用程序。加载数据大约需要 2-3 分钟（大约 +- 1500 行数据），因此用户体验非常糟糕。

在将数据加载到datagrid 时，我可能缺少什么明显的东西来使 UI 正常工作？任何建议将不胜感激，谢谢！ :)

更新代码：

public partial class pgSysproStock : Window
{
    public pgSysproStock()
    {
        InitializeComponent();
        SysproStock.WindowState = WindowState.Normal;
        dgSysproStock.IsEnabled = false;

        worker.DoWork += worker_DoWork;
        worker.RunWorkerCompleted += worker_RunWorkerCompleted;
        worker.WorkerReportsProgress = true;
        worker.ProgressChanged += worker_ProgressChanged;
        worker.RunWorkerAsync();
    }

    private readonly BackgroundWorker worker = new BackgroundWorker();

    private async void worker_DoWork(object sender, DoWorkEventArgs e)
    {
        using (TruckServiceClient TSC = new TruckServiceClient())
        {
            List<AllStock> allStock = new List<AllStock>();
            this.Dispatcher.Invoke((Action)(() =>
            {
                prgStockProgress.Visibility = Visibility.Visible;
            }));
            foreach (var item in await TSC.GetSysproStockAsync())
                allStock.Add(new AllStock
                {
                    Id = item.Id,
                    StockCode = item.StockCode,
                    Description = item.Description,
                    ConvFactAltUom = item.ConvFactAltUom,
                    ConvMulDiv = item.ConvMulDiv,
                    ConvFactOthUom = item.ConvFactOthUom,
                    MulDiv = item.MulDiv,
                    Mass = item.Mass,
                    Updated_Supplier = item.Updated_Supplier,
                    CycleCount = item.CycleCount,
                    ProductClass = item.ProductClass.ToString(),
                    UnitCost = item.UnitCost,
                    Discount = item.Discount,
                    Warehouse = item.Warehouse,
                    MinimumStock = item.MinimumStock,
                    MaximumStock = item.MaximumStock,
                    StockForNow = item.StockForNow,
                    CoilWidth = item.CoilWidth,
                    SheetCoilLength = item.SheetCoilLength,
                    MaterialThickness = item.MaterialThickness
                });
            e.Result = allStock.ToArray();
        }
    }

    private void worker_ProgressChanged(object sender, ProgressChangedEventArgs e)
    {
        this.prgStockProgress.Value = e.ProgressPercentage;
    }

    private void worker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
    {            
        dgSysproStock.ItemsSource = (AllStock[])e.Result;
        dgSysproStock.IsEnabled = true;
    }
}

编辑：我还从我的编码方法中删除了async 和await，但数据似乎仍然没有通过。

我在此处添加了一个断点：foreach (var item in await TSC.GetSysproStockAsync())，但我无法通过TSC.GetSysproStock()) 代码。为什么要这样做？

Answer 1

正确使用 async/await：

    public pgSysproStock()
    {
        InitializeComponent();
        SysproStock.WindowState = WindowState.Normal;

        this.UpdateStockAsync();
    }

    private async void UpdateStockAsync()
    {
        dgSysproStock.IsEnabled = false;

        using (TruckServiceClient TSC = new TruckServiceClient())
        {
            var allStock = await TSC.GetSysproStockAsync().ToArray();

            dgSysproStock.ItemsSource = allStock.Select(item =>
                        new AllStock
                            {
                                Id = item.Id,
                                StockCode = item.StockCode,
                                Description = item.Description,
                                ConvFactAltUom = item.ConvFactAltUom,
                                ConvMulDiv = item.ConvMulDiv,
                                ConvFactOthUom = item.ConvFactOthUom,
                                MulDiv = item.MulDiv,
                                Mass = item.Mass,
                                Updated_Supplier = item.Updated_Supplier,
                                CycleCount = item.CycleCount,
                                ProductClass = item.ProductClass.ToString(),
                                UnitCost = item.UnitCost,
                                Discount = item.Discount,
                                Warehouse = item.Warehouse,
                                MinimumStock = item.MinimumStock,
                                MaximumStock = item.MaximumStock,
                                StockForNow = item.StockForNow,
                                CoilWidth = item.CoilWidth,
                                SheetCoilLength = item.SheetCoilLength,
                                MaterialThickness = item.MaterialThickness
                        }).ToArray();

        dgSysproStock.IsEnabled = true;
    }
}

Answer 2

BackgroundWorker 不应该这样使用。尝试将数据传递给 RunWorkerCompleted 事件处理程序并从那里更新 UI。

删除这个：

this.Dispatcher.Invoke((Action)(() =>
{
    dgSysproStock.ItemsSource = (allStock.ToArray());
    dgSysproStock.IsEnabled = true;
}));

在 DoWork 事件处理程序中，将 Result 设置为您的数据：

e.Result = allStock.ToArray();

然后在 RunWorkerCompleted 事件处理程序中：

dgSysproStock.ItemsSource = (AllSTock[])e.Result;
dgSysproStock.IsEnabled = true;