Question

我将数据从Form1的一个WPF窗口传输到Form2的另一个WPF窗口，但每次我将数据从Form2传输到Form1我必须关闭并打开Form1。是否有替代方法可以在不关闭和打开Form1的情况下传输数据？

FORM1

private void txtSellerCode_GotFocus(object sender, RoutedEventArgs e)
{
    SelectSeller frmSelectSeller = new SelectSeller();
    frmSelectSeller.Show();
    this.Hide();
}

FORM2

private void SelectBtn_Click(object sender, RoutedEventArgs e)
{
    DataRowView drv = (DataRowView)dataGridSeller.SelectedItem;
    clsCreateInvoice.S_ID = int.Parse(drv["B_ID"].ToString());
    clsCreateInvoice.S_Code = drv["B_Code"].ToString();
    clsCreateInvoice.S_Name_Address = drv["B_Name"].ToString() + " ," + 
    drv["B_Address_1"].ToString() + " ," + drv["B_Address_2"].ToString();

    CreateInvoice frmCreateInvoice = new CreateInvoice();
    frmCreateInvoice.txtSellerCode.Text = drv["B_Code"].ToString();
    frmCreateInvoice.lblSellerNameAddress.Text = drv["B_Name"].ToString() + " ," + 
    drv["B_Address_1"].ToString() + " ," + drv["B_Address_2"].ToString();
    frmCreateInvoice.Show();
    this.Hide();
}

Answer 1

在通常用于WPF应用程序的MVVM模式中，这可以通过多种方式实现。以下方式可能是最简单的方法：

1）代码隐藏文件中当前的代码将进入一种名为“ViewModel”的类中。这是一个不依赖于任何面向UI的对象的类，而是充当XAML视图的“DataContext”。这两个通过Xaml数据绑定表达式链接起来。为了使类至少成为ViewModel，它必须实现INotifyPropertyChanged接口。 Form1和Form2背后的代码都需要放在一个实现名为Form1ViewModel和Form2ViewModel的INotifyPropertyChanged的类中。

2）Form1ViewModel的实例可以订阅Form2ViewModel实例的更改，这样每次Form1属性更改时，Form2中的处理程序都可以捕获更改并更新它自己的匹配属性

3）Form1View.xaml和Form2View.xaml可以使用双向绑定表达式分别绑定到Form1ViewModel.cs和Form2ViewModels.cs的属性，这样每次Form1ViewModel.MyProperty都会更改（感谢Form2ViewModel的更新），任何绑定到Form1ViewModel.MyProperty的UI控件都将使用视图模型属性的新值进行更新。

编辑（如何在没有 MVVM的情况下执行此类操作）

我建议创建一个测试WPF项目。向名为“ChildWindow”的项目添加一个新窗口。将我的所有代码粘贴到文件后，运行该项目。单击“显示子表单”按钮。将两个窗户分开，以便可以并排查看。在MainWindows TextBox中键入一些文本，然后观看ChildWindow的文本框自动更新它的文本！

MainWindow.xaml：

<Window x:Class="Wpf_2FormSync.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="MainWindow" Height="350" Width="525" DataContext="{Binding RelativeSource={RelativeSource Self}}" > <Grid> <Grid.RowDefinitions> <RowDefinition Height="82*"/> <RowDefinition Height="10*"/> <RowDefinition Height="10*"/> </Grid.RowDefinitions> <TextBox Text="{Binding MyName, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"></TextBox> <Button Click="Button_Click_1" Grid.Row="1" >Show Child Form</Button> <Button Grid.Row="2" Click="Button_Click_2" >Update Child Window</Button> </Grid> </Window>

MainWindow.xaml.cs：

using System; using System.ComponentModel; using System.Windows; namespace Wpf_2FormSync { /// <summary> /// Interaction logic for MainWindow.xaml /// </summary> public partial class MainWindow : Window, INotifyPropertyChanged { private ChildWindow _childWindow = null; private string _myName = ""; public string MyName { get { return _myName; } set { if (value == _myName) return; _myName = value; NotifyOfPropertyChanged("MyName"); if (_childWindow != null) _childWindow.MyName = value; } } public MainWindow() { InitializeComponent(); } private void Button_Click_1(object sender, RoutedEventArgs e) { _childWindow = new ChildWindow(); _childWindow.Show(); _childWindow.MyName = "John"; } public event PropertyChangedEventHandler PropertyChanged; public void NotifyOfPropertyChanged(string propertyName) { if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs(propertyName)); } private void Button_Click_2(object sender, RoutedEventArgs e) { if (_childWindow != null) _childWindow.MyName = this.MyName; } } }

ChildWindow.xaml：

<Window x:Class="Wpf_2FormSync.ChildWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="ChildWindow" Height="300" Width="300" DataContext="{Binding RelativeSource={RelativeSource Self}}" > <Grid > <Grid.RowDefinitions> <RowDefinition Height="112*"/> <RowDefinition Height="157*"/> </Grid.RowDefinitions> <TextBox Text="{Binding MyName, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" Grid.Row="0"></TextBox> <Button Grid.Row="1" Click="Button_Click_1">Show</Button> </Grid> </Window>

ChildWindow.xaml.cs：

using System.ComponentModel; using System.Windows; namespace Wpf_2FormSync { /// <summary> /// Interaction logic for ChildWindow.xaml /// </summary> public partial class ChildWindow : Window, INotifyPropertyChanged { private string _myName = ""; public string MyName { get { return _myName; } set { if (value == _myName) return; _myName = value; NotifyOfPropertyChanged("MyName"); } } public ChildWindow() { InitializeComponent(); } public event PropertyChangedEventHandler PropertyChanged; public void NotifyOfPropertyChanged(string propertyName) { if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs(propertyName)); } private void Button_Click_1(object sender, RoutedEventArgs e) { MessageBox.Show(MyName); } } }

Answer 2

听起来你需要一个模态窗口。使用ShowDialog（）而不是Show（）

这是你想要的行为吗？

FORM1:

private void txtSellerCode_GotFocus(object sender, RoutedEventArgs e)
{
    SelectSeller frmSelectSeller = new SelectSeller();
    frmSelectSeller.ShowDialog();
    this.txtSellerCode.Text = frmSelectSeller.SellerCode;
    this.lblSellerNameAddress.Text = frmSelectSeller.SellerNameAddress

}

FORM2:
//add these public properties
public string SellerCode {get; set;}
public string SellerNameAddress {get; set;}

private void SelectBtn_Click(object sender, RoutedEventArgs e)
{
    DataRowView drv = (DataRowView)dataGridSeller.SelectedItem;
    clsCreateInvoice.S_ID = int.Parse(drv["B_ID"].ToString());
    clsCreateInvoice.S_Code = drv["B_Code"].ToString();
    clsCreateInvoice.S_Name_Address = drv["B_Name"].ToString() + " ," + drv["B_Address_1"].ToString() + " ," + drv["B_Address_2"].ToString();

    SellerCode = drv["B_Code"].ToString();
    SellerNameAddress = drv["B_Name"].ToString() + " ," + drv["B_Address_1"].ToString() + " ," + drv["B_Address_2"].ToString();

    this.Close();

}

如果你需要在form2可见时隐藏Form1

private void txtSellerCode_GotFocus(object sender, RoutedEventArgs e)
{
    SelectSeller frmSelectSeller = new SelectSeller();
    this.Hide();
    frmSelectSeller.ShowDialog();
    this.Show();
    this.txtSellerCode.Text = frmSelectSeller.SellerCode;
    this.lblSellerNameAddress.Text = frmSelectSeller.SellerNameAddress

}

Answer 3

以下是满足我需求的方法：

窗口1

private void txtSellerCode_GotFocus(object sender, RoutedEventArgs e) 
{ 
SelectSeller frmSelectSeller = new SelectSeller(this); 
frmSelectSeller.Show(); 
this.Hide(); 
}

Window 2

public partial class SelectSeller : Window
{
    CreateInvoice _frmCreateInvoice;
    public SelectSeller(CreateInvoice frmCreateInvoice)
    {
        InitializeComponent();
 _frmCreateInvoice = frmCreateInvoice;
    }

    private void SelectBtn_Click(object sender, RoutedEventArgs e)
    {
        DataRowView drv = (DataRowView)dataGridSeller.SelectedItem;
        clsCreateInvoice.S_ID = int.Parse(drv["B_ID"].ToString());
        clsCreateInvoice.S_Code = drv["B_Code"].ToString();
        clsCreateInvoice.S_Name_Address = drv["B_Name"].ToString() + " ," + drv["B_Address_1"].ToString() + " ," + drv["B_Address_2"].ToString();

        _frmCreateInvoice.txtSellerCode.Text = drv["B_Code"].ToString();
        _frmCreateInvoice.lblSellerNameAddress.Text = drv["B_Name"].ToString() + " ," + drv["B_Address_1"].ToString() + " ," + drv["B_Address_2"].ToString();
        this.Hide();
    }
}

在打开的WPF窗口表单中更新数据

3 个答案: