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c#wpfxamlmvvmprism
Eldho
Eldho

Reputation: 8273

How to use Composite command in mvvm

Intro I'm working with WPF with MVVM-Light application

Goal

I have to invoke two commands from the same event, Is this possible using MVVM.?

Xaml look like this

 <i:Interaction.Triggers>
    <i:EventTrigger EventName="Loaded">
        <command:EventToCommand Command="{Binding Command1}" PassEventArgsToCommand="False" />
        <command:EventToCommand Command="{Binding Command2}" PassEventArgsToCommand="False" />
    </i:EventTrigger>
</i:Interaction.Triggers>

Problem

When hooking two commands only one of them is invoked while triggering the event.

Q1 How to invoke two commands in a event?

I have heard about Composite commands in PRISM

For example, the CompositeCommand class is used in the Stock Trader Reference Implementation (Stock Trader RI) in order to implement the SubmitAllOrders command represented by the Submit All button in the buy/sell view. When the user clicks the Submit All button, each SubmitCommand defined by the individual buy/sell transactions is executed.

.
Q2 Is there anything like this in MVVM ?

Upvotes: 2

Views: 1647

Answers (1)

Jesus Janne
Jesus Janne

Reputation: 21

Try using 2 event triggers:

<i:Interaction.Triggers>
    <i:EventTrigger EventName="Loaded">
        <command:EventToCommand Command="{Binding Command1}" PassEventArgsToCommand="False" />
    </i:EventTrigger>
    <i:EventTrigger EventName="Loaded">
        <command:EventToCommand Command="{Binding Command2}" PassEventArgsToCommand="False" />
    </i:EventTrigger>
</i:Interaction.Triggers>

Upvotes: 2

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