Question

如何将信息从一个wpf窗口发送到另一个窗口。我想要的是string filepath保存第一次调用时获得的信息。

这是问题所在，当我从window1.xmal.cs单击button1时，它会从DocumentManager.cs调用openfile()。当我从window2.xmal.cs访问filepath时，它会给出一个空字符串。我想保存从window1.xmal.cs调用时获得的文件路径字符串。

这就是我所拥有的：

window1.xmal.cs

DocumentManager mgr = new DocumentManager();

private void Button1_Click(object sender, RoutedEventArgs e) {
        ImageSource imgsource = new BitmapImage(new Uri(mgr.openfile().ToString())); 
        themeImage.Source = imgsource;
}

DocumentManager.cs

public string filePath;
public object openfile() {
    OpenFileDialog open = new OpenFileDialog();
    bool? result = open.ShowDialog();

    if (result == true) {
        filePath = open.FileName;  
    }
    return filePath;
}

Answer 1

我认为您的问题是您实例化DocumentManager类的方式我做了一个有效的例子。这是代码：

MainWindow

public partial class MainWindow : Window
{   DocumentManager mgr;       
    Window2 w2;
    public MainWindow() { InitializeComponent(); }
    private void MainWindow_Loaded(object sender, RoutedEventArgs e)
    {  mgr = new DocumentManager(); w2 = new Window2(); w2.Show(); }
    private void Button_Click(object sender, RoutedEventArgs e)
    { ImageSource imgsource; string imglocation;
        try {
            imglocation = mgr.openfile().ToString();
            imgsource = new BitmapImage(new Uri(imglocation));
            result.Text = imglocation;
            w2.imgsource = imgsource;
        }
        catch (Exception ex)
        { System.Windows.MessageBox.Show(ex.Message); }
    }
}

<强> DocumentManager

class DocumentManager
{
    public string filePath;
    public string openfile()
    {
        Microsoft.Win32.OpenFileDialog open = new Microsoft.Win32.OpenFileDialog();
        bool? result = open.ShowDialog();
        if (result == true) { filePath = open.FileName; }
        else { filePath = "Nothing Opened"; }
        return filePath;
    }
}

MainWindow XAML

<Window x:Class="CrossClassDialog.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="MainWindow" Height="120" Width="350" Loaded="MainWindow_Loaded">
    <Grid>
        <Button Content="Button" HorizontalAlignment="Left" VerticalAlignment="Top" Click="Button_Click"/>
       <TextBlock x:Name="result" HorizontalAlignment="Left" Text="TextBlock" VerticalAlignment="Top" Margin="0,30,0,0"/>
    </Grid>
</Window>

Window2 XAML

<Window x:Class="CrossClassDialog.Window2"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window2" Height="300" Width="300">
<Grid>
    <Viewbox HorizontalAlignment="Left" VerticalAlignment="Top">
        <Image x:Name="OpenedImage" Source="{Binding ImageSource}" />
    </Viewbox>
</Grid>
</Window>

在Window2中添加此属性

    private ImageSource _imgsource;
    public ImageSource imgsource
    {
        get { return _imgsource; }
        set 
        { 
            _imgsource = value;
            OpenedImage.Source = value;
        }
    }

顺便说一句，我更改了一些类似于openfile()方法返回的类型。

如何从一个窗口发送信息到另一个窗口？ WPF

1 个答案: