Check if item exists in ListView

Question

I have this code:

    <Page.Resources>
            <DataTemplate x:Key="IconTextDataTemplate">
                <StackPanel Orientation="Horizontal" Width="220" Height="60" Background="#FF729FD4">
                    <Border Background="#66727272" Width="40" Height="40" Margin="10">
                        <Image Source="/SampleImage.png" Height="32" Width="32" Stretch="UniformToFill"/>
                    </Border>
                    <StackPanel Orientation="Vertical" VerticalAlignment="Center">
                        <TextBlock Text="{Binding Name}" Margin="10,0,0,0" Width="170" Height="20" TextTrimming="WordEllipsis"/>
                        <TextBlock Text="{Binding Description}" Margin="10,0,0,0" Width="170" Height="20" TextTrimming="WordEllipsis"/>
                    </StackPanel>
                </StackPanel>
            </DataTemplate>
</Page.Resources>
    <ListView x:Name="Name" ItemTemplate="{StaticResource IconTextDataTemplate}"   Grid.Row="6" Margin="40,20,40,10" HorizontalAlignment="Stretch" Foreground="White" SelectionChanged="DoSomething">
                        <ListView.ItemsPanel>
                            <ItemsPanelTemplate>
                                <ItemsWrapGrid MaximumRowsOrColumns="4"/>
                            </ItemsPanelTemplate>
                        </ListView.ItemsPanel>
                    </ListView>

And another ListView with the same properties with another x:Name. I need to copy the items from one ListView to another.

I have a code that do it, my question is how can I check if the item in one ListView already copied to the second ListView? Thanks.

Solution 1

If you just want if the name has allready been added you can use linq like this

if(!listView2.Items.Any(item => item.Name == theNameToCheck))
{
     //copy item
}

Contains() would require you to have have IEquatable Implemented by the class of the ListViews items:

class Test : IEquatable<Test>
{
    public string Name { get; set; }
    public int OtherProperty { get; set; }

    public bool Equals(Test other)
    {
        return other.Name == this.Name;
    }
}

Then you can just do:

if(!listView2.Items.Contains(theItem))
{
     listView2.Items.Add(theItem);
}

That is unless you really have the same instance of the class and not a copy of the class (another object with the same properties)

Solution 2

Assuming that you just give a simple list to the listviews:

listView1.Items = myItemList;

and you use the same list to copy the elements to the second listview, you could simply do this:

MyItem itemToCopy = listView1.SelectedItem; //Or where ever your item comes from

if(!listView2.Items.contains(itemToCopy)
{
    listView2.Items.add(itemToCopy);
}
else
{
    // Item is already in the list
}