Windows Phone 7中怎么查找DataTemplate中的控件？

Question

我在LongListSelector控件有用DataTemplate布局联系人如下

<DataTemplate x:Key="ItemsTemplate">
            <Grid Margin="0,0,0,20" >
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="90"/>
                    <ColumnDefinition Width="*"/>
                    <ColumnDefinition Width="60"/>
                </Grid.ColumnDefinitions>
                <Grid.RowDefinitions>
                    <RowDefinition Height="*"/>
                    <RowDefinition Height="0.3*"/>
                </Grid.RowDefinitions>
               <!-- <Image x:Name="imgHead" Source="/Images/head.jpg" Grid.Row="0" Grid.RowSpan="2" Width="90" Height="90"/>-->
                <TextBlock x:Name="tbName" Grid.Row="0" Grid.Column="1"  FontSize="38"  TextAlignment="Left" VerticalAlignment="Center" TextWrapping="Wrap" Text="{Binding Name}" />
                <TextBlock  x:Name="tbPhone" Grid.Row="1" Grid.Column="1"  FontSize="25"  TextAlignment="Left" VerticalAlignment="Center" TextWrapping="Wrap" Text="{Binding Phone}"  />
                <CheckBox Grid.Row="0" Grid.Column="2" Grid.RowSpan="2" IsChecked="{Binding IsCheck, Mode=TwoWay}" x:Name="cbCheck"/>
            </Grid>
        </DataTemplate>

在后台代码中我用下面方法获取选中的CheckBox

 string phones = string.Empty;
            sb.Clear();

            
            if (VisualTreeHelper.GetChildrenCount(lsAllContacts) > 0)
            {
                IEnumerable<Grid> AllGrids = FindChildren<Grid>(this.lsAllContacts);//得到所有的Grid
                foreach (var grid in AllGrids.ToList())
                {
                    object objTbPhone = grid.FindName("tbPhone");
                    if (objTbPhone != null)
                    {
                        object objCheck = grid.FindName("cbCheck");
                        object objName = grid.FindName("tbName");

                        if (objCheck != null)
                        {
                            if (((CheckBox)objCheck).IsChecked == true)
                            {
                                smsComposeTask.To += ((TextBlock)objTbPhone).Text;

                               sb.Append(((TextBlock)objName).Text + ";");
                            }
                        }
                    }

                }
            }

FindChildren方法

public IEnumerable<T> FindChildren<T>(DependencyObject parent) where T : class
        {
            var count = VisualTreeHelper.GetChildrenCount(parent);
            if (count > 0)
            {
                for (var i = 0; i < count; i++)
                {
                    var child = VisualTreeHelper.GetChild(parent, i);
                    var t = child as T;
                    if (t != null)
                        yield return t;

                    var children = FindChildren<T>(child);
                    foreach (var item in children)
                        yield return item;
                }
            }
        }

用这种方法得不到所有的CheckBox，只能得到部份，不知道是为什么，程序中是递归了子控件的呀。

Answer 1

grid控件采用树形结构存储，遍历子控件时建议采用使用Silverlight Toolkit TreeView

http://silverlight.codeplex.com/

---

Xuesong

Answer 2

Hi,

如果确定已经得到了所有的Grid,那么可以进行单步调试,进入控件中查看是否获取了相应的控件

如果无法获取,则如你提供的代码,FindChildren<CheckBox>可以成为你的下一步执行的代码.来获取你需要的Element.