在 WPF 表单之间传递数据 [英] Passing data between WPF forms

问题描述

form1 有一个 button btnInvoke 调用 form2.form2 包含一个 textbox 和一个 button btn2.

form1 has a button btnInvoke which invokes form2. form2 contains a textbox and a button btn2.

用户必须在textbox 中输入数据并按下btn2.

The user has to enter data in textbox and press btn2.

当btn2被点击时form2必须将textbox data发送到form1.

When btn2 is clicked form2 has to send textbox data to form1.

我尝试通过构造函数，但我无法启动 form1 的新实例.

I have tried passing through constructors but I cant initiate a new instance of form1.

我该怎么办?

推荐答案

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，然后从该方法中读取值.

There are two methods that you can use. The first of which would be using ShowDialog and a public method then testing that the DialogResult is true then reading the value from the method.

即

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

第二种方法是创建一个 CustomEvent 并像这样在创建窗口中订阅它.

The second method would be to create a CustomEvent and subscribe to it in the creating window like this.

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; }
    }
}

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