Xamarin 表单按钮点击计数

Question

当用户点击主页上的 btnOffline 时，它​​会将他们重定向到第二页。当用户单击第二页上的按钮完成（button_clicked 事件）时，我将记录时间戳。我现在面临的错误是当它在 button_clicked 事件之后导航回主页时，我再次单击 btnOffline 和 btnDone，lblEndDT 的时间戳发生了变化。我只想从第二页获得第一次点击，但它仍然会发生变化

主页

 public partial class MainPage : ContentPage
{
public string mainpagevalue;

int offlinecount = 0;
int onlinecount = 0;

public MainPage()
{
    InitializeComponent();

}
private void btnOffline_Clicked(object sender, EventArgs e)
{
    offlinecount++;
    txtOfflineStatus.Text = "IN PROGRESS";

    Navigation.PushAsync(new SecondPage(this, lblEndDT, txtOfflineStatus, btnOnline, btnMH));


    if (offlinecount == 1)
    {
        string currentDT = DateTime.Now.ToString();
        lblStartDT.Text = currentDT;
      }


   }

第二页

public partial class SecondPage : ContentPage
{
    Label MainPagelblEndDT;
    MainPage mainPage;
    ImageButton myImageBtn;
    int btndonecount = 0;
public SecondPage()
{
    InitializeComponent();
}

public SecondPage(MainPage mainP,Label lblEndDT)
{
    InitializeComponent();

    //Get the lblEndDT reference here
    MainPagelblEndDT = lblEndDT;
    //Get the MainPage reference here
    mainPage = mainP;
}

public SecondPage(MainPage mainP, Label lblEndDT, ImageButton imageBtn)
{
    InitializeComponent();

    //Get the lblEndDT reference here
    MainPagelblEndDT = lblEndDT;
    //Get the MainPage reference here
    mainPage = mainP;
    //Get the ImageButton reference here
    myImageBtn = imageBtn;
}

private void Button_Clicked(object sender, EventArgs e)
{           
    btndonecount++;
    if(btndonecount == 1)
    {

       string edt = DateTime.Now.ToString();
       MainPagelblEndDT = edt;
       mainPage.mainpagevalue = MainPagelblEndDT.Text;
    }

       Navigation.PopAsync();
   }
}

Answer 1

当您再次单击btnOffline 和btnDone 时，SecondPage 中的btndonecount 会重置，因此它仍然会发生变化。

您应该从mainPage 获取点击计数，将offlinecount 传递给SecondPage：

private void btnOffline_Clicked(object sender, EventArgs e)
{
    offlinecount++;
    txtOfflineStatus.Text = "IN PROGRESS";

    Navigation.PushAsync(new SecondPage(this, lblEndDT, txtOfflineStatus, btnOnline, btnMH,offlinecount));


    if (offlinecount == 1)
    {
        string currentDT = DateTime.Now.ToString();
        lblStartDT.Text = currentDT;
    }


}

在SecondPage 中，获取clickCount 并删除btndonecount++：

   public SecondPage(MainPage mainP, Label lblEndDT, ImageButton imageBtn, int clickCount)
    {
        InitializeComponent();

        //Get the lblEndDT reference here
        MainPagelblEndDT = lblEndDT;
        //Get the MainPage reference here
        mainPage = mainP;
        //Get the ImageButton reference here
        myImageBtn = imageBtn;

        btndonecount = clickCount;
    }

    private void Button_Clicked(object sender, EventArgs e)
    {
        if (btndonecount == 1)
        {
            string edt = DateTime.Now.ToString();
            MainPagelblEndDT = edt;
            mainPage.mainpagevalue = MainPagelblEndDT.Text;
        }

        Navigation.PopAsync();
    }