在WPF中禁用上下文菜单按钮

Question

I created a button that looks like:

Here is the xaml:

<Button x:Name="InstallButtonContainer" Style="{StaticResource ResourceKey=StyleAppButton}" Grid.Column="3" >
    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="*"/>
            <ColumnDefinition Width="15"/>
        </Grid.ColumnDefinitions>
        <Button x:Name="InstallButton" Content="Install" Grid.Column="0"
            Style="{StaticResource ResourceKey= StyleDropDownButton}"
            ToolTip="{x:Static local:ToolTipStrings.INSTALLBUTTONTOOLTIP}" Click="InstallButton_Click"
            ToolTipService.ShowDuration="2000" 
            Margin="-20,-2,-4.5,-2" Grid.ColumnSpan="2" Width="51" FontFamily="Calibri"  />
        <Button x:Name="DropdownButton" Grid.Column="1"  Margin="18,-2,-20,-2" 
             Width="14" Click="load_install_dropdown" Style="{StaticResource ResourceKey= StyleDropDownButton}">
            <Button.ContextMenu>
                <ContextMenu x:Name="ButtonContextMenu">
                    <MenuItem Header="Install" Click="BaseReleaseInstallContextMenuClick" x:Name="MultiInstallBtn">
                        <MenuItem.Icon>
                            <Image Width="12" Height="12">
                                <Image.Source>
                                    <ImageSource>Resources/install.ico</ImageSource>
                                </Image.Source>
                            </Image>
                        </MenuItem.Icon>
                    </MenuItem>
                    <MenuItem Header="Silent Install" Click="BaseReleaseSilentInstallContextMenuClick" x:Name="MultiInstallSilentBtn">
                        <MenuItem.Icon>
                            <Image Width="12" Height="12">
                                <Image.Source>
                                    <ImageSource>Resources/install.ico</ImageSource>
                                </Image.Source>
                            </Image>
                        </MenuItem.Icon>
                    </MenuItem>
                    <MenuItem Header="Download" Click="BaseReleaseMultipleDownloadContextMenuClick">
                        <MenuItem.Icon>
                            <Image Width="12" Height="12">
                                <Image.Source>
                                    <ImageSource>Resources/Down.png</ImageSource>
                                </Image.Source>
                            </Image>
                        </MenuItem.Icon>
                    </MenuItem>
                </ContextMenu>
            </Button.ContextMenu>
            <StackPanel Orientation="Horizontal">
                <Path x:Name="BtnArrow" Margin="-3,-10" VerticalAlignment="Center" Width="8" Height="10" Fill="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}" 
                    Stretch="Uniform" HorizontalAlignment="Right" 
                    Data="F1 M 301.14,-189.041L 311.57,-189.041L 306.355,-182.942L 301.14,-189.041 Z "/>
            </StackPanel>
        </Button>
    </Grid>
</Button>

Now based on some condition, I want to disable the Install and Silent Install buttons through code.

I tried using:

if(condition)
{
    MultiInstallBtn.IsEnabled = false;
}

but it does not seems to work. Is there anything wrong in the way I am accessing it?

Answer 1

As long as that code is in the code behind of the control then it should work.

I notice that there may be some custom styling being applied too. Could it be that you are missing styling for the menu item disabled state? So the menu item is actually disabled, but visually it doesn't present in a different way?

Check that in the style or control template for the Menu Item that it is reacting to the control's IsEnabled property or that there's a "Disabled" VisualState defined.