Question

我在WindowAfterLogin.xaml中有一段代码：

<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" />

然后我想更改TextBlock中WindowAfterLogin.xaml.cs的值，所以我已经这样做了：

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，当我按下F5按钮（编译）时，它没有改变。这里的问题在哪里？

Answer 1

您是否正在创建WindowAfterLogin的单独实例？如果您想这样做，则必须Show()新实例。试试这个：

    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..

如果您希望In_Time.Text更改为当前实例（假设已经显示或可见），您可以尝试使用构造函数或初始化WindowAfterLogin的方法：

In_Time.Text = DateTime.Now.Hour.ToString() + ":" + DateTime.Now.Minute.ToString();

Answer 2

作为位答案的简化，请尝试编写类似这样的内容而不是代码

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

我认为你需要

DateTime.Now.ToString("hh:mm")

而不是

DateTime.Now.Hour.ToString() + ":" + DateTime.Now.Minute.ToString()

如何在wpf C＃中传递参数

2 个答案: