C# 在 WPF 表单之间传递数据
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Passing data between WPF forms
提问by Vasanth91
form1has a button btnInvokewhich invokes form2. form2contains a textboxand a button btn2.
form1有一个button btnInvoke调用form2. form2包含 atextbox和 a button btn2。
The user has to enter data in textboxand press btn2.
用户必须输入数据textbox并按btn2。
When btn2is clicked form2has to send textbox datato form1.
当btn2点击form2了发送textbox data来form1。
I have tried passing through constructors but I cant initiate a new instance of form1.
我试过通过构造函数，但我无法启动form1.
What shall I do?
我该怎么办？
回答by Habib
In your form1define a public property.
在您form1定义一个公共属性。
public string MyTextData { get; set; }
In your form2on button click, get the instance of the form1and set it property to the TextBox value.
在您form2的按钮单击中，获取 的实例form1并将其属性设置为 TextBox 值。
var frm1 = Application.Current.Windows["form1"] as Form1;
if(frm1 ! = null)
frm1.MyTextData = yourTextBox.Text;
In your Form1you will get the text in your property MyTextData
在您Form1的属性中，您将获得文本MyTextData
Its better if you following the convention for naming the windows. Use Windowinstead of Formfor naming your windows in WPF. Form is usually used with WinForm applications.
如果您遵循命名窗口的约定，那就更好了。使用Window，而不是Form在WPF命名你的窗户。Form 通常与 WinForm 应用程序一起使用。
回答by Daniel Kelley
It may be overkill but an EventAggregatormay be a nice solution here. It would allow you to raise an event in form1that could then be subscribed to from form2.
这可能有点矫枉过正，但EventAggregator在这里可能是一个不错的解决方案。它将允许您引发一个事件form1，然后可以从form2.
There are some details and examples of implementing an EventAggregatorin https://stackoverflow.com/questions/2343980/event-aggregator-implementation-sample-best-practices.
EventAggregator在https://stackoverflow.com/questions/2343980/event-aggregator-implementation-sample-best-practices 中有一些实现 an 的细节和示例。
回答by Mark Hall
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.
您可以使用两种方法。第一个将使用 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。
i.e.
IE
if (newWindow.ShowDialog() == true)
this.Title = newWindow.myText();
The second method would be to create a CustomEvent and subscribe to it in the creating window like this.
第二种方法是创建一个 CustomEvent 并像这样在创建窗口中订阅它。
MainWindow.xaml.cs
主窗口.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
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; }
}
}
回答by Christoph
Since you are working with the WPF, use CommandBindingsand Messaging. I also recommend you that you take a closser look at MVVM Frameworks, I prevere the MVVM Light Toolkit. There are a lot of HowTos for the framework, just ask google.
由于您正在使用 WPF，请使用CommandBindings和Messaging。我还建议你仔细看看 MVVM 框架，我喜欢MVVM Light Toolkit。框架的HowTos很多，去google问问就知道了。
