UWP 雙向綁定,在ListView中有個TextBox,怎麼獲取Text的值

要求:評論寶貝的時候一個訂單裡面包含多個產品,獲取對產品的評論內容哦

1. xaml界面

 1  <ListView x:Name="lvDetail">
 2                      <ListView.ItemTemplate>
 3                             <DataTemplate>
 4                                 <StackPanel>
 5                                     <RelativePanel Padding="10,0,0,0">
 6                                         <Image x:Name="imgoods" Height="75" Width="75" Source="{Binding GoodsPicture}" />
 7                                         <TextBlock x:Name="tbName" Text="{Binding GoodsName}"  FontSize="16" RelativePanel.RightOf="imgoods" Margin="10,0,0,0"  />
 8                                         <TextBlock x:Name="tbColor" Text="{Binding SpecValue}"  Foreground="#C5C5C5" RelativePanel.Below="tbName" RelativePanel.RightOf="imgoods" Margin="8,5,0,0"/>
 9                                         <TextBlock x:Name="tbUnitPrice"   RelativePanel.AlignRightWithPanel="True" Margin="0,0,10,0">
10                                      <Run Text="￥" Foreground="Red"/>
11                                      <Run  Text="{Binding UnitPrice}" FontSize="16" Foreground="Red"/>
12                                         </TextBlock>
13                                         <TextBlock   RelativePanel.AlignRightWithPanel="True" RelativePanel.AlignVerticalCenterWithPanel="True"  Margin="0,0,10,0">
14                                    <Run Text="x"/>
15                                    <Run Text="{Binding Quantity}" />
16                                         </TextBlock>
17                                     </RelativePanel>
18                                     <!-- 評價內容-->
19                                     <Grid Margin="10" BorderBrush="Gray" BorderThickness="1" CornerRadius="2">
20                                         <TextBox x:Name="tbContent" Text="{Binding Path=Content, Mode=TwoWay}" BorderBrush="Transparent" TextWrapping="Wrap" Height="100" PlaceholderText="親,寫點什麼吧,您的意見對其他買家提供很多幫助"/>
21                                     </Grid>
22                                 </StackPanel>
23                             </DataTemplate>
24                         </ListView.ItemTemplate>
25                     </ListView>

要求:獲取ListView中x:Name為tbContent的值(評論內容)

第一步:綁定TextBox的值使用Mode=TwoWay

<TextBox x:Name="tbContent" Text="{Binding Path=Content, Mode=TwoWay}" BorderBrush="Transparent" TextWrapping="Wrap" Height="100" PlaceholderText="親,寫點什麼吧,您的意見對其他買家提供很多幫助"/>

第二步:GoodsList集合的實體(也就是評論內容所在的實體模型)要實現INotifyPropertyChanged介面

 1   public class Goods : INotifyPropertyChanged
 2     {
 3        private string content;
 4         /// <summary>
 5         /// 內容(評價寶貝使用)
 6         /// </summary>
 7         public string Content
 8         {
 9             get
10             {
11                 return content;
12             }
13             set
14             {
15                 content = value;
16                 if (this.PropertyChanged != null)
17                 {
18                     this.PropertyChanged.Invoke(this, new PropertyChangedEventArgs("Content"));
19                 }
20             }
21         }
22         public event PropertyChangedEventHandler PropertyChanged;
23     }