wpf button command binding after trigger the property changes

Question

i have a button in my wpf form and the button is having the image text in mvvm application when i click the button it will attach the file, my requirement is when it attached successfully the text is changed to Approve , I want to write another command property for this command after changed the text to Approve.

<Button ToolTip="Attach Approval" 
        Height="25" 
        Command="{Binding AddAttachmentCommand}" 
        Margin="5,10,5,10">
    <Button.Style>
        <Style TargetType="{x:Type Button}">
            <!-- Default Content value -->
            <Setter Property="Content">
                <Setter.Value>
                    <StackPanel Orientation="Horizontal">
                        <Image Source="/UILibrary;component/Themes/Default/Images/Attach.PNG"/>
                    </StackPanel>
                </Setter.Value>
            </Setter>

            <!-- Triggered values -->
            <Style.Triggers>
                <DataTrigger Binding="{Binding IsAttachmentAvailable}" Value="True">
                    <Setter Property="Visibility" Value="Visible"/>
                    <Setter Property="Content" Value="Appprove"/>
                </DataTrigger>
                <DataTrigger Binding="{Binding IsAttachmentAvailable}" Value="False">
                    <Setter Property="Visibility" Value="Visible"/>
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </Button.Style>

Also, why is Visibility getting set to the same value "Visible". There is also no need of a stackpanel for the image — d.moncada
– d.moncada, Commented May 20, 2015 at 15:14
I guess op is trying to change the button text/content once the file is attached(uploaded) — Muds
– Muds, Commented May 20, 2015 at 15:41
The button text is changed successfully, but after that i declare <Setter Property="Command" Value="{Binding isapprovetemplatecommand}"/> , but at this time the button is not firing this command it is firing the previous command... — user3089816
– user3089816, Commented May 20, 2015 at 15:55

Krishna · Accepted Answer · 2015-05-20 16:10:41Z

If you want to change a property (in your case the Command) in a trigger, you have to initialise the property in the style setter. To make your code work remove the command property from the button and add the command property to the style setter.

<Button ToolTip="Attach Approval" 
        Height="25" 

        Margin="5,10,5,10">
    <Button.Style>
        <Style TargetType="{x:Type Button}">
            <!-- Default Content value -->
            <Setter Property="Command" Value="{Binding AddAttachmentCommand}"/>
            <Setter Property="Content">
                <Setter.Value>
                    <StackPanel Orientation="Horizontal">
                        <Image Source="/UILibrary;component/Themes/Default/Images/Attach.PNG"/>
                    </StackPanel>
                </Setter.Value>
            </Setter>

            <!-- Triggered values -->
            <Style.Triggers>
                <DataTrigger Binding="{Binding IsAttachmentAvailable}" Value="True">
                    <Setter Property="Visibility" Value="Visible"/>
                    <Setter Property="Content" Value="Appprove"/>
                    <Setter Property="Command" Value="SOME OTHER COMMAND"/>
                </DataTrigger>
                <DataTrigger Binding="{Binding IsAttachmentAvailable}" Value="False">
                    <Setter Property="Visibility" Value="Visible"/>
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </Button.Style>

@user3089816 if I answered your question, then please accept my answer as solved.

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