Could not populate combobox with data created by nested class

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Hello
in nested class below (WPF program)
i could not populate the comboBox1 and comboBox2 with data (Mv[0].Vp and Mv[1].Vp) see line A and line B
the comboBoxes are empty.

What I have tried:

<pre lang="C#"><pre>
        public class VIDEOPERSON
        {
            public string VideoName { get; set; }
        }

        public class MainVideO
        {   public VIDEOPERSON[] Vp;
            public MainVideO() { }
            public VIDEOPERSON this[int i]
            { get { return Vp[i]; } set { Vp[i] = value; } }
        }
		    //more part of the MainWindow.cs program
			MainVideO[] Mv = new MainVideO[2];
            for (int i = 0; i < 2; i++)
            {
                Mv[i] = new MainVideO();
                Mv[i].Vp = new VIDEOPERSON[5];
                for (int j = 0; j < 5; j++) Mv[i].Vp[j] = new VIDEOPERSON();
            }

		//more code from MainWindow.xaml.cs
		Mv[0].Vp[0].VideoName = "D:\\Chees00";
		Mv[0].Vp[1].VideoName = "D:\\Chees01";
		Mv[0].Vp[2].VideoName = "D:\\Chees02";
		//
		Mv[1].Vp[0].VideoName = "D:\\Chees10";
		Mv[1].Vp[1].VideoName = "D:\\Chees11";
		Mv[1].Vp[2].VideoName = "D:\\Chees12";

XML

<pre>		<ComboBox x:Name="ComboBox1" Grid.Row="0" Grid.Column="2">
            <ComboBox.ItemTemplate>
                <DataTemplate>
                    <TextBlock Text="{Binding Mv[0].Vp}"/>  <!--"Line A"-->
                </DataTemplate>
            </ComboBox.ItemTemplate>
        </ComboBox>
        <!---->
        <ComboBox x:Name="ComboBox2" Grid.Row="0" Grid.Column="3">
            <ComboBox.ItemTemplate>
                <DataTemplate>
                    <TextBlock Text="{Binding Mv[1].Vp}"/>  <!--"Line B"-->
                </DataTemplate>
            </ComboBox.ItemTemplate>
        </ComboBox>

Posted 30-Sep-21 7:35am

Engineer khalid

Updated 3-Oct-21 19:27pm

v3

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Comments

[no name] 30-Sep-21 13:58pm

You're binding to Mv; Mv is a local variable / field; not a property.

Engineer khalid 4-Oct-21 1:25am

that was my 1st wpf program
i will use the program below...thanks any way

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Engineer khalid · Answer 1 · 2021-10-03T19:27:00

public class VIDEOPERSON{public string VIDEONAME { get ; set ;}}
.
.
public List<VIDEOPERSON> VideoPerson = new List<VIDEOPERSON>();
//
VideoPerson.Add(new VIDEOPERSON { VIDEONAME = "D:\\aWPFc#\\ProgramByHelpFrmUTube\\WPFControls_2\\WPFControls_1\\Chees00.mp4" });
VideoPerson.Add(new VIDEOPERSON { VIDEONAME = "D:\\aWPFc#\\ProgramByHelpFrmUTube\\WPFControls_2\\WPFControls_1\\Chees01.mp4" });
VideoPerson.Add(new VIDEOPERSON { VIDEONAME = "D:\\aWPFc#\\ProgramByHelpFrmUTube\\WPFControls_2\\WPFControls_1\\Chees02.mp4" });
ComboBox1Mp4.ItemsSource = VideoPerson;
//.....
.
.
private void ComboBox2Mp4SelectionChangedClick(object sender, SelectionChangedEventArgs e)
{
int id = ComboBox1Mp4.SelectedIndex;
Uri ww;
ww = new System.Uri(VideoPerson[id].VIDEONAME);
Media1.Source = ww;
}