Question

I have the following problem: I made a UserControl in WPF which has an AgreementID property. I need to call this UserControl in another UserControl, and I need to give an AgreementID with it when I call it. Now I made a DependencyProperty in the first UserControl, but it does not work.

This is the code of my first UserControl:

public partial class UC1001_AgreementDetails_View : UserControl
    {

        private UC1001_ActiveAgreementContract _contract;
        private int _agreementID;

        public int AgreementID
        {
            get { return _agreementID; }
            set { _agreementID = value; }
        }

        public UC1001_AgreementDetails_View()
        {
            InitializeComponent();
        }

       public static readonly DependencyProperty AgreementIDProperty = DependencyProperty.Register("AgreementID", typeof(int), typeof(UC1001_AgreementDetails_View), new PropertyMetadata(null));

This is the XAML where I call previous UserControl:

 <DataGridTextColumn.ElementStyle>
            <Style TargetType="{x:Type TextBlock}">
            <!--<Setter Property="Text" Value="{Binding Months[9].AgreementID}"/>-->
            <Setter Property="Tag" Value="{Binding Months[9].AgreementID}"/>
            <Setter Property="Background" Value="White" />
            <Setter Property="DataGridCell.ToolTip">
                 <Setter.Value>
                     <my:UC1001_AgreementDetails_View Background="#FFF" Opacity="0.88" AgreementID="{Binding Months[9].AgreementID}"/>
                 </Setter.Value>
            </Setter>

So I want to pas the AgreementID of that month onto the first UserControl, but when I check it, the passed value is always 0, but it should be 3. I checked the Months[9].AgreementID value and it was 3 indeed. So I get the right value in the binding, but it’s not passing through right.

I hope my problem is a bit clear to you, additional information can be given if wanted!

Answer 1

You are defining the Property facade for the Dependency Property wrong. In your property definition, you need to work on the Dependency Property and set and return its value:

public int AgreementID
{
    get { return (int) GetValue(AgreementIDProperty ); }
    set { SetValue(AgreementIDProperty, value); }
}