CODEWITHSUNDEEP
c#wpf
user1205398
user1205398

Reputation: 661

Pass multi parameter to CommandParameter in xaml

I want to pass serval parameters to a command via commandparameter in xaml. 

<i:InvokeCommandAction Command="{Binding HideLineCommand, ElementName=militaryLineAction}"
                       CommandParameter="{Binding ID, ElementName=linesSelector}"/>

In above sample, I want to pass others variables to the command beside the ID variable. How can I achieve it? Great thanks.

Upvotes: 4

Views: 16326

Answers (1)

kmatyaszek
kmatyaszek

Reputation: 19296

You can use MultiBinding with a converter.

Check this example.

Let's suppose that you have Person class.

public class Person
{
    public string Name { get; set; }
    public int Age { get; set; }
}

And you want this class as your command parameter.

Your XAML should look like this:

<Button Content="Start"
                DataContext="{Binding SourceData}"
                >
            <i:Interaction.Triggers>
                <i:EventTrigger EventName="Click">
                    <i:InvokeCommandAction Command="{Binding SendStatus, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=Window}}">
                        <i:InvokeCommandAction.CommandParameter>
                            <MultiBinding Converter="{StaticResource myPersonConverter}">
                                <MultiBinding.Bindings>
                                    <Binding Path="Name" />
                                    <Binding Path="Age" />
                                </MultiBinding.Bindings>
                            </MultiBinding>
                        </i:InvokeCommandAction.CommandParameter>
                    </i:InvokeCommandAction>
                </i:EventTrigger>
            </i:Interaction.Triggers>
        </Button>

Where SourceData is a Person object.

And myPersonConverter is a PersonConverter object.

public class PersonConverter : IMultiValueConverter
    {   
        public object Convert(object[] values, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            if (values != null && values.Length == 2)
            {
                string name = values[0].ToString();
                int age = (int)values[1];

                return new Person { Name = name, Age = age }; 
            }
            return null;
        }

        public object[] ConvertBack(object value, Type[] targetTypes, object parameter, System.Globalization.CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }

And in your command you can use Person object as parameter:

    public ICommand SendStatus { get; private set; }
    private void OnSendStatus(object param)
    {
        Person p = param as Person;
        if (p != null)
        {

        }
    }

Upvotes: 7

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