检查项目是否存在于ListView中 [英] Check if item exists in ListView

问题描述

我有此代码:

    <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>

和另一个ListView具有与另一个x:Name相同的属性.我需要将项目从一个ListView复制到另一个.

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

我有执行此操作的代码，我的问题是如何检查一个ListView中的项目是否已复制到第二个ListView? 谢谢.

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.

推荐答案

如果只想添加名称，则可以使用linq这样的方式

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()将要求您具有由ListViews项的类实现的IEquatable:

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;
    }
}

然后您可以做:

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

那是除非您确实具有该类的相同实例而不是该类的副本(另一个具有相同属性的对象)

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)

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