Question

我如何通过它的名称引用GUI元素作为所有元素的字符串，甚至是标签项内的网格中的元素。现在我有了这段代码：

Module VisualExtensions
<System.Runtime.CompilerServices.Extension>
Public Iterator Function GetVisualChildren(Of T As Visual)(parent As DependencyObject) As IEnumerable(Of T)
    Dim child As T = Nothing
    Dim numVisuals As Integer = VisualTreeHelper.GetChildrenCount(parent)
    For i As Integer = 0 To numVisuals - 1
        Dim v As Visual = DirectCast(VisualTreeHelper.GetChild(parent, i), Visual)
        child = TryCast(v, T)
        If v IsNot Nothing Then
            For Each item In GetVisualChildren(Of T)(v)
                Yield item
            Next
        End If
        If child IsNot Nothing Then
            Yield child
        End If
    Next
End Function
End Module

这段代码称之为：

Try
            For Each s In output
                Dim nameOfControl = s
                Dim window = Windows.Application.Current.Windows(0)
                Dim visuals = GetVisualChildren(Of FrameworkElement)(window)
                Dim child = visuals.OfType(Of FrameworkElement)()
                Dim match = child.FirstOrDefault(Function(x) x.Name = nameOfControl)
                match.Visibility = Visibility.Collapsed
            Next
        Catch ex As NullReferenceException

        Finally
        End Try

如果 s 是＆＃34; veleprodajaTab＆＃34;它运行良好（代码折叠该选项卡）和该选项卡的xml是：

<TabItem x:FieldModifier="public" x:Name="veleprodajaTab" Header="Maloprodaja"  FontSize="10"  VerticalAlignment="Bottom">

但如果 s 是＆＃34; buttonRefresh＆＃34;它不起作用，它不能引用该对象。我在调试中遇到nullreferenceexception 孩子 Nothing

代码＆＃34; buttonRefresh＆＃34; （围着它的网格）：

<TabItem x:FieldModifier="public" x:Name="maloprodajaTab"...
<Grid  x:FieldModifier="public" x:Name="maloprodajaTabGrid"...
<Grid   x:FieldModifier="public" x:Name="gridFckp"
<Button  x:FieldModifier="public" x:Name="buttonRefresh" Content="Refresh" HorizontalAlignment="Left" Margin="276,6,0,0" VerticalAlignment="Top" Width="75" Grid.ColumnSpan="2"/>
</grid>
</grid>

我似乎无法引用** TabItem **

内的任何内容

如果我尝试设置window.buttonRefresh.Visibility = Visibility.Collapsed代码有效，但在网格中引用 childs 时出现问题

Answer 1

由于TabControl已虚拟化，因此无法实现。您需要在Visual Tree中导航，向其传递所需元素的名称。看看这里： Find WPF controls by name or type

所以你可以这样做：

set terminal postscript enhanced color
set output 'test.ps'

set xlabel 'x'
set ylabel 'y'
set title 'Top 1'
set key box vertical width 2 height 1 maxcols 1 spacing 3

set xr [0:pi]
set xtics nomirror
set ytics nomirror

plot \
    sin(x) w l lw 3 lc rgb 'red' t '{/Symbol y}', \
    cos(x) w l lw 3 lc rgb 'blue' t '@{/Symbol ~&{y}{-1.0&{.}}}{/Symbol ~y{0.8.}}@{/Symbol &{y}}'

并称之为：

private T FindChildByname<T>(DependencyObject parent, string name) where T : FrameworkElement
    {
        T child = default(T);
        for (int i = 0; i < VisualTreeHelper.GetChildrenCount(parent); i++)
        {
            var ch = VisualTreeHelper.GetChild(parent, i);
            child = ch as T;
            if (child != null && child.Name == name)
                break;
            else
                child = FindChildByname<T>(ch, name);

            if (child != null) break;
        }
        return child;
    }

按名称引用GUI元素作为字符串

1 个答案: