c# - 基于 C# 桌面应用程序的加载器动画

Question

在jquery ajax beforeSend 中是否有类似的方法并在C# 中完成？

因为在网络中，我通常在按下添加按钮时会设置beforendSend:一个功能来显示图像并隐藏图像功能complete:

现在我想在 C# 桌面应用程序中做。有没有类似的？像某种使用进度条

Answer 1

这是一个winforms应用程序吗？它有一个可以使用的 ProgressBar 控件。WPF 也有一个。但是您将希望在后台线程上进行处理，以便您的 UI 保持响应并更新您的进度条。

Answer 2

您将需要执行后台处理和 UI 回调。下面非常简单的例子：

private void button3_Click(object sender, EventArgs e)
    {
        ProcessingEvent += AnEventOccurred;

        ThreadStart threadStart = new ThreadStart(LongRunningProcess);
        Thread thread = new Thread(threadStart);
        thread.Start();
    }

    private void LongRunningProcess()
    {
        RaiseEvent("Start");

        for (int i = 0; i < 10; i++)
        {
            RaiseEvent("Processing " + i);
            Thread.Sleep(1000);
        }

        if (ProcessingEvent != null)
        {
            ProcessingEvent("Complete");
        }
    }

    private void RaiseEvent(string whatOccurred)
    {
        if (ProcessingEvent != null)
        {
            ProcessingEvent(whatOccurred);
        }
    }

    private void AnEventOccurred(string whatOccurred)
    {
        if (this.InvokeRequired)
        {
            this.Invoke(new Processing(AnEventOccurred), new object[] { whatOccurred });
        }
        else
        {
            this.label1.Text = whatOccurred;
        }
    }

    delegate void Processing(string whatOccurred);

    event Processing ProcessingEvent;

Answer 3

您需要实现如下：

    FrmLoading f2 = new FrmLoading();   // Sample form whose Load event takes a long time
    using (new PleaseWait(this.Location, () => Fill("a")))  // Here you can pass method with parameters
          { f2.Show(); }

请稍等.cs

public class PleaseWait : IDisposable
{
    private FrmLoading mSplash;

    //public delegate double PrdMastSearch(string pMastType);
    public PleaseWait(Point location, Action methodWithParameters)
    {
        //mLocation = location;
        Thread t = new Thread(workerThread);
        t.IsBackground = true;
        t.SetApartmentState(ApartmentState.STA);
        t.Start();
        methodWithParameters();
    }
    public void Dispose()
    {
        mSplash.Invoke(new MethodInvoker(stopThread));
    }
    private void stopThread()
    {
        mSplash.Close();
    }
    private void workerThread()
    {
        mSplash = new FrmLoading();   // Substitute this with your own
        mSplash.StartPosition = FormStartPosition.CenterScreen;
        //mSplash.Location = mLocation;
        mSplash.TopMost = true;
        Application.Run(mSplash);
    }
}

它工作 100% 正确......现在在我的系统中工作。