wpf - 无法使用自定义控件

Question

I have a custom control inside a StackPanel

<Window x:Class="Video_Editor.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"
    xmlns:m="clr-namespace:Video_Editor">
<Grid>
    </StackPanel>
    <ScrollViewer Margin="10,40,10,10" Grid.Row="2" VerticalScrollBarVisibility="Auto">
        <StackPanel Name="stackPanel" >
            <m:CustomControl Name="testControl"/>
        </StackPanel>
    </ScrollViewer>
</Grid>

The custom control currently doesn't do anything.

public class CustomControl: ItemsControl
{
}

I tried to do this in the window's constructor:

public MainWindow()
{
    InitializeComponent();
    testControl.Items.Add("item");
}

I am getting an error "the name "testControl does not exist in the current context.

Answer 1

You will have to use x:Name since you are deriving from another FrameworkElement that is exposing the Name property itself.

If a FrameworkElement has set its Name property (which ItemsControl seems to be doing) you cannot declare the Name property on the derived type, but you can use the Xaml x:Name property so you can decare a Name and access from code behind

Example:

    <StackPanel Name="stackPanel" >
        <m:CustomControl x:Name="testControl"/>
    </StackPanel>