在WPF表单之间传递数据

Question

form1有一个button btnInvoke调用form2.form2包含a textbox和a button btn2.

用户必须输入数据textbox并按下btn2.

当btn2点击form2了发送textbox data来form1.

我试过通过构造函数,但我无法启动一个新的实例form1.

我该怎么办？

Answer 1

您可以使用两种方法.第一个是使用ShowDialog和一个公共方法,然后测试DialogResult是否为真,然后从方法中读取值.

即

if (newWindow.ShowDialog() == true)
            this.Title = newWindow.myText();

第二种方法是创建一个CustomEvent并在创建窗口中订阅它,就像这样.

MainWindow.xaml.cs

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
    }

    private void button1_Click(object sender, RoutedEventArgs e)
    {
        Window1 newWindow = new Window1();
        newWindow.RaiseCustomEvent += new EventHandler<CustomEventArgs>(newWindow_RaiseCustomEvent);
        newWindow.Show();

    }

    void newWindow_RaiseCustomEvent(object sender, CustomEventArgs e)
    {
        this.Title = e.Message;
    }
}

Window1.xaml.cs

public partial class Window1 : Window
{
    public event EventHandler<CustomEventArgs> RaiseCustomEvent;

    public Window1()
    {
        InitializeComponent();
    }
    public string myText()
    {
        return textBox1.Text;
    }
    private void button1_Click(object sender, RoutedEventArgs e)
    {

        RaiseCustomEvent(this, new CustomEventArgs(textBox1.Text));
    }
}
public class CustomEventArgs : EventArgs
{
    public CustomEventArgs(string s)
    {
        msg = s;
    }
    private string msg;
    public string Message
    {
        get { return msg; }
    }
}