c# - 在winforms中从数据库异步加载数据

Question

很多时候我们在表单加载中使用数据库中的数据填充 UI，这就是表单卡住几秒钟的原因。所以我只想知道如何异步加载数据并在表单加载中填充 UI，结果我的表单不会卡住并且也会响应，但我不想使用后台工作类。请帮助我提供可以解决我的问题的示例代码。

谢谢

Answer 1

这是一个注释良好的示例代码:

示例:

// This method can be called on Form_Load, Button_Click, etc.
private void LoadData()
{
    // Start a thread to load data asynchronously.
    Thread loadDataThread = new Thread(LoadDataAsync);
    loadDataThread.Start();
}

// This method is called asynchronously
private void LoadDataAsync()
{
    DataSet ds = new DataSet();

    // ... get data from connection

    // Since this method is executed from another thread than the main thread (AKA UI thread),
    // Any logic that tried to manipulate UI from this thread, must go into BeginInvoke() call.
    // By using BeginInvoke() we state that this code needs to be executed on UI thread.

    // Check if this code is executed on some other thread than UI thread
    if (InvokeRequired) // In this example, this will return `true`.
    {
        BeginInvoke(new Action(() =>
        {
            PopulateUI(ds);
        }));
    }
}

private void PopulateUI(DataSet ds)
{
    // Populate UI Controls with data from DataSet ds.
}