目前我试图实现一个绑定到数据模板(WPF-MVVM)的可观察集合。在初始化期间,它将默认值加载到可观察集合中。思想是:绑定可观察的集合更新没有'RemoveOf'和'插入'
- 用户提供的文本框中某个值,
- 按ENTER键
- 递增计数器和位于附近的文本框中输入文本块更新的计数值。
目的是跟踪用户更改文本值的次数。
现在它正在使用'IndexOf','RemoveAt'和'Insert'。有没有'删除'和'插入'的方法。
我觉得我的代码有问题吗?任何人都可以帮助它。
InputDataTemplate.xaml:
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="2*" />
<ColumnDefinition Width="2*" />
<ColumnDefinition Width="1*" />
</Grid.ColumnDefinitions>
<Label Grid.Column="0" HorizontalAlignment="Center" VerticalAlignment="Center" Content="{Binding Name}" />
<Label Grid.Column="2" HorizontalAlignment="Center" VerticalAlignment="Center" Content="{Binding Count}" />
<TextBox x:Name="IpDataTb" Grid.Column="1" Width="60" HorizontalAlignment="Center" VerticalAlignment="Center" DataContext="{Binding}" Text="{Binding Path=Data, Mode=TwoWay}">
<i:Interaction.Triggers>
<i:EventTrigger EventName="KeyDown">
<ei:CallMethodAction TargetObject="{Binding }" MethodName="IpDataTrig" />
</i:EventTrigger>
</i:Interaction.Triggers>
</TextBox>
</Grid>
TestView.xaml:
<UserControl.Resources>
<DataTemplate x:Key="InputDataTemplate" >
<local:InputDataTemplate DataContext="{Binding}" />
</DataTemplate>
</UserControl.Resources>
<Grid>
<Border BorderBrush="#FF0254B4" BorderThickness="1" >
<ScrollViewer VerticalScrollBarVisibility="Auto" HorizontalScrollBarVisibility="Auto" >
<ItemsControl ItemsSource="{Binding InputDatas}"
ItemTemplate="{DynamicResource InputDataTemplate}" />
</ScrollViewer>
</Border>
</Grid>
DataService.cs:
using MyObsrCollTest.ViewModels;
namespace MyObsrCollTest.Services
{
public class InputDataService : BindableBase
{
public string Name { get; set; }
public string Count { get; set; }
public string Data { get; set; }
public void IpDataTrig(object sender,KeyEventArgs e)
{
var IpDataTb = new TextBox();
IpDataTb = (TextBox)sender;
if ((e.Key == Key.Enter) &&(!string.IsNullOrWhiteSpace(IpDataTb.Text)))
{
this.Data = IpDataTb.Text;
ObsrCollTestVm.TestMe(this.Name, this.Data);
}
}
}
}
个ObsrCollTestVm.cs:
private ObservableCollection<InputDataService> _InputDatas;
static int _count = 0;
public ObsrCollTestVm(void)
{
for (int i = 0; i < 5; i++)
{
var l_InputDatas = new InputDataService();
l_InputDatas.Name = i.ToString();
l_InputDatas.Count = "0";
l_InputDatas.Data = "?";
_InputDatas.Add(l_InputDatas);
}
}
基本初始化程序:
public ObservableCollection<InputDataService> InputDatas
{
get
{
if (_InputDatas == null)
{
_InputDatas = new ObservableCollection<InputDataService>();
}
return _InputDatas;
}
}
新观察到的集合:
public static void TestMe(string name, string data)
{
var found = _InputDatas.FirstOrDefault(element = > element.Name == name);
if (found != null)
{
int i = _InputDatas.IndexOf(found);
found.Count = _count++;
_InputDatas.RemoveAt(i);
_InputDatas.Insert(i, found);
}
}
递增计数值:
非常感谢。它的工作现在完美。 – kar
很高兴听到您能够让您的代码正常工作。您可能有兴趣阅读关于Stack Overflow如何工作的更多信息:[当有人回答我的问题时,我该怎么办?](http://stackoverflow.com/help/someone-answers)。其他信息可以在此页面的链接中找到:http://stackoverflow.com/help/asking –