GroupBOx内容WPF

时间:2011-02-08 08:46:25

标签: .net wpf

我有GroupBox名称groupBox1,它包含StackPanel。在StackPanel我有serevral ChechBoxes。在我的xaml.cs中我想得到那些CheckBoxes但是当我写下一个代码行时我得到一个零:

int n = VisualTreeHelper.GetChildrenCount(groupBox1); 

如果我写下一个代码行,我会得到exeption:

  

“指定的索引超出范围或   index处的child为null。不要打电话   这个方法如果是VisualChildrenCount   返回零,表示该   视觉没有孩子。参数   name:index实际值为0.“

Visual v = (Visual)VisualTreeHelper.GetChild(groupBox1, 0);

这意味着我的groupBox1没有任何子代......但是StackPanel呢?

我有这个函数应该在VisualTree上,它看起来像这样:

private void VisualChildren (Visual myVisual)
{          
    for (int i = 0; i < VisualTreeHelper.GetChildrenCount(myVisual); i++)
    {
        Visual childVisual = (Visual)VisualTreeHelper.GetChild(myVisual, i);

        //Some operations

        VisualChildren(childVisual);
    }
}

StackPanel ......

中不需要groupBox1

任何人都可以告诉我如何才能找到那些CheckBoxes? 谢谢。


这是我的xaml:

<Window x:Class="MyNamespace.MyClass"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Test" Height="300" Width="300" Loaded="Window_Loaded" Name="win1">
     <Grid Name="grid1">
        <GroupBox Header="GroupBox" Margin="0,0,95,124" Name="groupBox1">
            <StackPanel Orientation="Vertical" Height="105">
                <CheckBox Height="Auto" Name="checkBox4" Width="Auto" Margin="2">CheckBox</CheckBox>
                <CheckBox Height="Auto" Name="checkBox2" Width="Auto" Margin="2">CheckBox</CheckBox>
                <CheckBox Height="Auto" Name="checkBox3" Width="Auto" Margin="2">CheckBox</CheckBox>
                <CheckBox Height="Auto" Name="checkBox5" Width="Auto" Margin="2">CheckBox</CheckBox>
                <CheckBox Height="Auto" Name="checkBox1" Width="Auto" Margin="2">CheckBox</CheckBox>
                <CheckBox Height="Auto" Name="checkBox6" Width="Auto" Margin="2">CheckBox</CheckBox>
                <CheckBox Height="Auto" Name="checkBox7" Width="Auto" Margin="2">CheckBox</CheckBox>
           </StackPanel>
        </GroupBox>
        <WrapPanel Orientation="Horizontal" Name="wrap2" Margin="8"    HorizontalAlignment="Center" VerticalAlignment="Bottom">
            <Button Margin="5" Height="23"   Name="button1"  VerticalAlignment="Bottom" HorizontalAlignment="Right" Width="75">Button</Button>
            <Button Margin="5" Height="23" HorizontalAlignment="Right"  Name="button2" VerticalAlignment="Bottom" Width="75">Button</Button>
            <Button Margin="5" Height="23" HorizontalAlignment="Right"  Name="button3" VerticalAlignment="Top" Width="75">Button</Button>
            <Button Margin="5" Height="23" HorizontalAlignment="Right"  Name="button4" VerticalAlignment="Top" Width="75">Button</Button>
            <Button Margin="5" Height="23" HorizontalAlignment="Right"  Name="button5" VerticalAlignment="Top" Width="75">Button</Button>
            <Button Margin="5" Height="23" HorizontalAlignment="Right"  Name="button6" VerticalAlignment="Top" Width="75">Button</Button>
        </WrapPanel>
    </Grid>
</Window>

这是代码:

public partial class Window1 : Window
{
    public Window1()
    {
        InitializeComponent();
        try
        {
            VisualChildren(grid1);
        }
    }

    private void VisualChildren(Visual myVisual)
    {
        for (int i = 0; i < VisualTreeHelper.GetChildrenCount(myVisual); i++)
        {
            Visual childVisual = (Visual)VisualTreeHelper.GetChild(myVisual, i);
            System.Windows.Forms.MessageBox.Show(childVisual.ToString());
            VisualChildren(childVisual);
        }
    }
}

1 个答案:

答案 0 :(得分:3)

显然问题是你在加载元素之前尝试获取元素的可视子元素。那时,视觉树尚未组成。尝试订阅组框的Loaded事件,并在事件处理程序中获取可视子项:

public partial class Window1 : Window
{
    public Window1()
    {
        InitializeComponent();

        Loaded += OnLoaded;
    }

    private void OnLoaded(object sender, EventArgs e)
    {
        VisualChildren(grid1);
    }

    ...
}