I can't change property of a button....

Question

Hello,

I wrote an app has 1 datepicker, 2 textblocks, 2 textboxes, and 2 buttons.

My problem is one of the buttons remains unabled like below.

xaml code for this view is:

<Window x:Class="WpfApp3.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfApp3"
        xmlns:model ="clr-namespace:WpfApp3.Model"
        xmlns:viewModel ="clr-namespace:WpfApp3.ViewModel"
        mc:Ignorable="d"
        Background="AliceBlue"
        ResizeMode="NoResize"
        Title="MainWindow" Height="400" Width="350">
    <Window.DataContext>
        <viewModel:MainViewModel/>
    </Window.DataContext>
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="1.5*"/>
            <RowDefinition Height="1.5*"/>
            <RowDefinition Height="1.5*"/>
            <RowDefinition Height="*"/>
        </Grid.RowDefinitions>
        <Grid Grid.Row="0">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="*"/>
                <ColumnDefinition Width="1.8*"/>
            </Grid.ColumnDefinitions>
            <TextBlock Grid.Column="0" x:Name="Date" Text="Date:" FontSize="20" FontWeight="Bold"  Margin="10,10,10,10" HorizontalAlignment="Center" VerticalAlignment="Center"/>
            <DatePicker x:Name="getdate" SelectedDate="{Binding SelectedDate}" Grid.Column="1" Width="200" Height="20" Margin="10,10,10,10" />
        </Grid>
        <Grid Grid.Row="1">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="*"/>
                <ColumnDefinition Width="1.8*"/>
            </Grid.ColumnDefinitions>
            <TextBlock Grid.Column="0" x:Name="Item" Text="Item:" FontSize="20" FontWeight="Bold" Margin="10,40,10,40" HorizontalAlignment="Center" VerticalAlignment="Center"/>
            <TextBox Grid.Column="1" FontSize="14" Text="{Binding Item}" Margin="10,40,10,40"/>
        </Grid>
        <Grid Grid.Row="2">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="*"/>
                <ColumnDefinition Width="1.8*"/>
            </Grid.ColumnDefinitions>
            <TextBlock Grid.Column="0" x:Name="Amount" Text="Amount:" FontSize="20" FontWeight="Bold" Margin="10,40,10,40" HorizontalAlignment="Center" VerticalAlignment="Center"/>
            <TextBox Grid.Column="1" FontSize="14" Text="{Binding Amount}"   Margin="10,40,10,40"/>
        </Grid>
        <Grid Grid.Row="3">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="*"/>
                <ColumnDefinition Width="*"/>
            </Grid.ColumnDefinitions>
            <Button Grid.Column="0" Content="ShowInput" Command="{Binding getInputCommand}" FontSize="14" FontWeight="Bold" Margin="20,10,20,10"/>
            <Button Grid.Column="1" Content="Clear" FontSize="14" Command="{Binding ClearCommand}" FontWeight="Bold" Margin="20,10,20,10"/>
 
        </Grid>
    </Grid>
</Window>

I changed "isEnabled" property for the button several times and saved it but these trials didn't work.

I didn't experience case like this before, so I don't know how can i fix it.

if anyone give me an advice for this, I'd be very appreciated.

thanks for your help in advance.

c00012

Answer 1

Hi @c00012 , Welcome to Microsoft Q&A,

There is nothing wrong with your code, except that you may have manually set the "isEnabled=false" of the button in your code-behind page.

To ensure that the problem is not with the command logic, you can temporarily remove the Command binding from the button and see if it is enabled:

I suggest you delete this button and add it again to try.

If you mean it cannot be enabled in runtime.

It may be because you are using button commands ("getInputCommand" and "ClearCommand"), please make sure the "CanExecute" logic of these commands allows the button to be enabled. If the "CanExecute" method returns "false", the button will remain disabled. In your ViewModel, make sure the "CanExecute" method of both commands is defined correctly and returns "true" when it should.

Best Regards,

Jiale

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