ListView绑定与“IsSelected” ListViewItem的属性 [英] ListView Binding with "IsSelected" Property of ListViewItem

问题描述

我有以下类

   public abstract class AbsTrinityEvent
   {
    public event IsSelected OnSelectedEvent; 

    bool _IsSelected;
    ITrinityEvent _objTrinityEvent;
    public AbsTrinityEvent(ITrinityEvent objTrinityEvent)
    {
        _objTrinityEvent = objTrinityEvent;
    }


    public ITrinityEvent TrinityEventObj
    {

        set
        {
            _objTrinityEvent = value;
        }

        get
        {
            return _objTrinityEvent;
        }
    }

    public int EventRefID
    {
        get
        {
            return _objTrinityEvent.EventRefID;
        }
    }

    public string EventDescription
    {
        get
        {
            return _objTrinityEvent.EventDescription;
        }
    }

    public string EventDateTime
    {
        get
        {
            return _objTrinityEvent.EventDateTime;
        }
    }

    public string Site
    {
        get
        {
            return _objTrinityEvent.Site;
        }
    }

    public int Priority
    {
        get
        {
            return _objTrinityEvent.Priority;
        }
    }

    public string DeviceName
    {
        get
        {
            return _objTrinityEvent.DeviceName;
        }
    }

    public bool IsAlarm
    {
        get
        {
            return _objTrinityEvent.IsAlarm;
        }
    }

    public string OperatorName
    {
        get
        {
            return _objTrinityEvent.OperatorName;
        }
    }

    public int SiteID
    {
        get
        {
            return _objTrinityEvent.SiteID;
        }
    }

    public int EventSrcInstanceID
    {
        get
        {
            return _objTrinityEvent.EventSrcInstanceID;
        }
    }


    public int EventSrcInstanceMasterDeviceID
    {
        get
        {
            return _objTrinityEvent.EventSrcInstanceMasterDeviceID;
        }
    }

    public bool IsSelected
    {
        set
        {
            _IsSelected = value;
            ItemSelectedEventArgs obj = new ItemSelectedEventArgs(_objTrinityEvent);
            OnSelectedEvent(this, obj);                                        
        }
        get
        {
            return _IsSelected;
        }
    }      

}

public class ItemSelectedEventArgs : EventArgs
{
    private ITrinityEvent _objItem;

    public ItemSelectedEventArgs(ITrinityEvent objItem)
    {
        _objItem = objItem;

    }

    public ITrinityEvent SlectedNode
    {
        get
        {
            return _objItem;
        }
    }
}

public sealed class TrinityEventData : AbsTrinityEvent
{
    public TrinityEventData(ITrinityEvent objEvent)
        : base(objEvent)
    {
    }
}

我有约束力这个到我的listview代码中（不在XAML中）使用以下函数

I am binding this to my listview in code behind ( Not in XAML ) using following function

    public void SetupColumnsForUnAcklist()
    {
        //Create Columns for listview
        GridView grdView = new GridView();
        grdView.Columns.Add(new GridViewColumn() { DisplayMemberBinding = new Binding() { Path = new PropertyPath("EventDescription") }, Header = "Description" });
        grdView.Columns.Add(new GridViewColumn() { DisplayMemberBinding = new Binding() { Path = new PropertyPath("EventDateTime") }, Header = "Date:Time" });
        grdView.Columns.Add(new GridViewColumn() { DisplayMemberBinding = new Binding() { Path = new PropertyPath("Site") }, Header = "Site" });
        grdView.Columns.Add(new GridViewColumn() { DisplayMemberBinding = new Binding() { Path = new PropertyPath("DeviceName") }, Header = "Device" });
        grdView.Columns.Add(new GridViewColumn() { DisplayMemberBinding = new Binding() { Path = new PropertyPath("Priority") }, Header = "Priority" });



        lstview_Unack.View = grdView;                   

        //Do Binding 
        if (_alarmUnAckList != null)
        {

            lstview_Unack.SetBinding(ListView.ItemsSourceProperty, new Binding() { Source = _alarmUnAckList });
            lstview_Unack.SetBinding(ListView.IsSelectedProperty, new Binding() { Path = new PropertyPath("IsSelected") });
        }

        lstview_Unack.ContextMenu = contextMenu;

        foreach (GridViewColumn col in grdView.Columns)
        {
            comboColumnList.Items.Add(col.Header as string);
        }           
    }     

我的问题是，我想绑定ListViewItemIsSelected属性到TrinityEventData的IsSelected属性。我应该如何在代码背后做。

My problem is, I want bind ListViewItem "IsSelected" Property to the TrinityEventData's "IsSelected" Property. How I should I do it in code behind.

请帮助。

Regards
Sandeep

Regards Sandeep

推荐答案

首先，你在XAML中做得更好。它使事情更清晰和更短。我将在XAML和代码隐藏中回答以证明这一点。

First off, you're much better off doing this in XAML. It makes things much clearer and shorter. I'm going to answer in both XAML and code-behind to demonstrate this.

最简单的方法是将样式应用于ListViewItem并使用Setter应用捆绑。在ListViewItem中，DataContext将是您的绑定项（在这种情况下为TrinityEventData）。

The easiest way is to make a Style applied to ListViewItem and using a Setter to apply the binding. On a ListViewItem, the DataContext is going to be your bound item (TrinityEventData in this case).

假设您在XAML中有您的ListView：

Assuming you had your ListView in XAML:

<ListView x:Name="lstview_Unack">
    <ListView.Resources>
        <Style TargetType="{x:Type ListViewItem}">
            <Setter Property="IsSelected" Value="{Binding IsSelected, Mode=TwoWay}"/>
        </Style>
    </ListView.Resources>
</ListView>

在代码中，您必须手工构造Style，Setter和Binding：

In code, you have to construct the Style, Setter, and Binding by hand:

Style listViewItemStyle = new Style { TargetType = typeof(ListViewItem) };
listViewItemStyle.Setters.Add(new Setter
{
    Property = ListViewItem.IsSelectedProperty,
    Value = new Binding { Path = new PropertyPath("IsSelected") }
});
lstview_Unack.Resources.Add(typeof(ListViewItem), listViewItemStyle);

然而，这与虚拟化存在问题。如果您的ListViewItems被虚拟化，您可能会在ListView中取消选择项目，但绑定将不会触发，因为您的ListViewItem将不存在。

There are issues with this and virtualization, however. If your ListViewItems get virtualized, you might be unselecting items in the ListView but the binding won't be firing because your ListViewItem won't exist.

这篇关于ListView绑定与“IsSelected” ListViewItem的属性的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！