获取列表项的问题 [英] Problem with getting listview item

问题描述

我有一个wpf应用程序，里面有一个listview.我使用了for循环来生成列表视图的项目，但是我的问题是我的item.count为17，我只能获取行0 1 2的值，而其他行为null，我不得不提到我可以显示信息设计模式下listview内的所有行(名称，照片等)，但是在后面的代码中，第3行及之后的行为null，有人可以指导我我错了我的问题吗?非常感谢.

解决方案

您的代码已损坏.坦率地说，Tanx Christian.让我发表我的代码的某些部分:

//这是我填写列表视图的一部分:
DataSet da = new DataSet();
connRead.Fill(da);
listView.DataContext = da.Tables [0];

//这部分是当我想获得商品的价值时:
ListViewItem容器= null;
for(int i = 0; i< listView.Items.Count; i ++)
{

container = listView.ItemContainerGenerator.ContainerFromIndex(i)as ListViewItem;

if(container！= null)//在这里，对于i = 3及更高版本，我得到null值
{
...
}


这是我的xaml部分:

 <   ListView     x:Name   ="  span>   高度  ="  202"  ItemsSource    {Binding}"    SelectionChanged   ="       Horizo​​ntalAlignment   左"   保证金  ="  20,84,0,0"  VerticalAlignment   ="     ="   435"    IsSynchronizedWithCurrentItem   ="   DataContext    {Binding}" <   ListView.ItemTemplate  > 
               <   DataTemplate  > 
                <  网格    ="  网格" <   Grid.RowDefinitions  > 
                   <   RowDefinition     ="  自动" > 
                   <   RowDefinition     ="  自动" > 
                   <   RowDefinition     ="   50" > 
                   <   RowDefinition     ="  自动" > 
                   <   RowDefinition     ="  自动" > 
               <  /Grid.RowDefinitions  > 
               <   Grid.ColumnDefinitions  > 
                   <   ColumnDefinition/ > 
                   <   ColumnDefinition/ > 
                   <   ColumnDefinition/ > 
                   <   ColumnDefinition/ > 
               <  /Grid.ColumnDefinitions  > 
                     <  图片    ="   image1" 宽度   70 " 高度   110"  Grid.Row   ="     ="   1"    ="   {Binding PhotoName}" "><  /图像 > 
                     <  标签    ="  电子邮件"  Grid.Row    0"  Grid.Column    2"   内容  ="  >  <  /Label  > 
                     <  标签    ="  名称"  Grid.Row    1"  Grid.Column    2" 内容  ="  >  <  /Label  > 
                     <  复选框    ="   chB"  Grid.Row    0"  Grid.Column    0" >  <  /CheckBox  > 
                <  /Grid  > 
               <  /DataTemplate  > 
           <  /ListView.ItemTemplate  > 
       <  /ListView  >  

Hi,I have a wpf application and inside that i have a listview . I used a for loop to generate the items of my listview but my problem is whereas my item.count is 17,I just can get value for rows 0 1 2 and other rows are null,I have to mention that I can display information for all rows inside my listview in design mode(names,photos,...) but in code behind i get null for rows 3 and after,can someone guide me what is my problem where I am wrong?thank you so much.

解决方案

Your code is broken. Hard to say more without seeing it.

Tanx Christian for your reply.let me post some parts of my code:

//here is the part when i fill up my listview:
DataSet da = new DataSet();
connRead.Fill(da);
listView.DataContext = da.Tables[0];

//this part is for when i want to get my items value:
ListViewItem container = null;
for (int i = 0; i < listView.Items.Count;i++ )
{

container = listView.ItemContainerGenerator.ContainerFromIndex(i) as ListViewItem;

if (container != null)//here for i = 3 and onward i get null value
{
...
}


this is my xaml part:

<ListView x:Name="listView" Height="202" ItemsSource="{Binding}"  SelectionChanged="listView_SelectionChanged"  HorizontalAlignment="Left" Margin="20,84,0,0" VerticalAlignment="Top" Width="435" IsSynchronizedWithCurrentItem="{x:Null}" DataContext="{Binding}">
               <ListView.ItemTemplate>
               <DataTemplate>
                <Grid x:Name="grid">
               <Grid.RowDefinitions>
                   <RowDefinition Height="Auto"/>
                   <RowDefinition Height="Auto"/>
                   <RowDefinition Height="50"/>
                   <RowDefinition Height="Auto"/>
                   <RowDefinition Height="Auto"/>
               </Grid.RowDefinitions>
               <Grid.ColumnDefinitions>
                   <ColumnDefinition/>
                   <ColumnDefinition/>
                   <ColumnDefinition/>
                   <ColumnDefinition/>
               </Grid.ColumnDefinitions>
                     <Image x:Name="image1" Width="70" Height="110" Grid.Row="1" Grid.Column="1"  Source="{Binding PhotoName}"></Image>
                     <Label x:Name="email" Grid.Row="0" Grid.Column="2"  Content="{Binding Email}"></Label>
                     <Label x:Name="name" Grid.Row="1" Grid.Column="2" Content="{Binding Name}"></Label>
                     <CheckBox x:Name="chB" Grid.Row="0" Grid.Column="0" ></CheckBox>
                </Grid>
               </DataTemplate>
           </ListView.ItemTemplate>
       </ListView>

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