[英]How to pass a parameter in wpf C#
我在WindowAfterLogin.xaml
有一個代碼:
<TextBlock x:Name="In_Time" Foreground="#FF55534F"
FontSize="71.312" FontFamily="HelveticaNeueCyr"
Height="79.45" LineStackingStrategy="BlockLineHeight"
Canvas.Left="2.724" LineHeight="71.312"
TextAlignment="Center" TextWrapping="Wrap"
Canvas.Top="69.985" Width="231.581" Text="09:00" />
然后我想在WindowAfterLogin.xaml.cs
更改該TextBlock
的值,所以我做到了:
MainWindow objMainWindow = new MainWindow();
WindowAfterLogin objAfterLogin = new WindowAfterLogin();
objMainWindow.Show();
objAfterLogin.In_Time.Text = DateTime.Now.Hour.ToString() + ":" + DateTime.Now.Minute.ToString();
this.Close();
但是,當我按F5按鈕(編譯)時,它沒有改變。 問題出在哪里?
您是否要創建WindowAfterLogin
的單獨實例? 如果要這樣做,則必須Show()
新實例。 嘗試這個:
WindowAfterLogin objAfterLogin = new WindowAfterLogin();
objAfterLoginShow();
objAfterLogin.In_Time.Text = DateTime.Now.Hour.ToString() + ":" + DateTime.Now.Minute.ToString();
//Close(); //Close any other window that needs to be closed..
如果要更改當前實例的In_Time.Text
(假定已顯示或當前可見),則可以在構造函數或初始化WindowAfterLogin
方法中嘗試進行此WindowAfterLogin
:
In_Time.Text = DateTime.Now.Hour.ToString() + ":" + DateTime.Now.Minute.ToString();
作為簡化到位的答案,嘗試寫這樣的事情,而不是你的代碼
MainWindow objMainWindow = new MainWindow();
objMainWindow.Show();
In_Time.Text = DateTime.Now.Hour.ToString() + ":" + DateTime.Now.Minute.ToString();
this.Close(); //Not sure if You need it. Try to comment this line to be able to notice textblock text changes
我也認為你需要
DateTime.Now.ToString("hh:mm")
代替
DateTime.Now.Hour.ToString() + ":" + DateTime.Now.Minute.ToString()
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