코드 뒤죽박죽에 바인딩

Question

MVVM 컨트롤에 대한 아주 오래된 컨트롤을 수정했습니다. 나는 경보 목록을 가지고있다. 사용자가 열 머리글의 버튼을 누르면 표시되는 알람 목록을 지우고 다음 알람으로 스크롤해야합니다 (처음에는 보이지 않음).

열 머리글의 컨트롤 템플릿에 단추를 만들었습니다. 명령 속성은 작동하지만 NaN을 반환하므로 명령 매개 변수를 창 보이는 부분의 높이에 바인딩하는 것이 올바르지 않습니다. 뒤에 코드를 디버깅 할 때 "높이"속성에는 숫자가 저장됩니다.

XAML :

<DataGrid x:Class="Kwa.Presentation.Views.AlarmList.AlarmList" 
      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
      xmlns:mc="http://schemas.openxmlformats.org/markup- 
      compatibility/2006" 
      xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
      xmlns:local="clr-namespace:Kwa.Presentation.Views.AlarmList" 
      xmlns:components="clr-namespace:Kwa.Presentation.Components" 
      xmlns:converters="clr-namespace:Kwa.Presentation.Converters" 
      xmlns:Trans="clr-namespace:Kwa.Presentation.Resources" 
      mc:Ignorable="d" 
      d:DesignHeight="500" d:DesignWidth="750" 
      ItemsSource="{Binding Alarms}" 
      SelectedItem="{Binding SelectedAlarm}" 
      IsSynchronizedWithCurrentItem="True" 
      CanUserResizeColumns="True" IsReadOnly="True" CanUserReorderColumns="False" CanUserSortColumns="False" SelectionMode="Single" CanUserAddRows="False" 
      Background="White" RowHeaderWidth="0" AutoGenerateColumns="False" GridLinesVisibility="None" RowHeight="{Binding Rowheight}" FrozenColumnCount = "1" 
      ScrollViewer.CanContentScroll="True" ScrollViewer.VerticalScrollBarVisibility="Auto" ScrollViewer.HorizontalScrollBarVisibility="Auto" 
      x:Name="AlarmFramework" 
      SizeChanged="AlarmFramework_SizeChanged" 
      > 

     <Style TargetType="DataGridColumnHeader" x:Key="WithButt"> 
      <Setter Property="Template"> 
       <Setter.Value> 
        <ControlTemplate TargetType="DataGridColumnHeader"> 
         <Border BorderBrush="Silver" BorderThickness="0 0 0 1" 
           Padding="5 0 0 0" Background="White"> 
          <StackPanel Orientation="Horizontal" Margin="0"> 
           <TextBlock Text="{Binding}" 
           VerticalAlignment="Center" FontWeight="Bold"/> 
           <Button Content="{x:Static Trans:TranslatedResources.AlarmAcceptContent}" Margin="60 3 10 3 " VerticalAlignment="Center" VerticalContentAlignment="Center" Padding="2" 
            Command="{Binding DataContext.AcknowledgeCommand, RelativeSource={RelativeSource AncestorType={x:Type local:AlarmList}}}" CommandParameter="{Binding Height, RelativeSource={RelativeSource AncestorType={x:Type local:AlarmList}}}" ToolTip="{x:Static Trans:TranslatedResources.AlarmAcceptTooltip}" Style="{StaticResource Butt}"/> 
          </StackPanel> 
         </Border> 
        </ControlTemplate> 
       </Setter.Value> 
      </Setter> 
     </Style> 
</DataGrid> 

뒤에 코드 :

공공 부분 클래스 AlarmList : 데이터 그리드

{ 개인 이중 높이 = 0;

public AlarmList() 
{ 
    InitializeComponent(); 
} 

private void AlarmFramework_SizeChanged(object sender, SizeChangedEventArgs e) 
{ 
    Height = e.NewSize.Height; 
} 

}

뷰 모델 :

public class AlarmListViewModel : MainViewModelBase 
    { 
private readonly IActionCommand _acknowledgeCommand; 
     public IActionCommand AcknowledgeCommand 
     { 
      get { return _acknowledgeCommand; } 
     } 
public AlarmListViewModel() 
     { 
      //Add command 
      _acknowledgeCommand = new ActionCommand<double>(p => Acknowledge(p)); 
     } 
private void Acknowledge(double parameter) 
     { 
      try 
      {    
       double DatagridWidth = (double)parameter; 
       int AmountAcknowledged = (int)Math.Floor(DatagridWidth/RowHeight); 
       int LastAlarmSent = Alarms[0].AlarmNumber + AmountAcknowledged; 
       _proxy.Send(LastAlarmSent); 
       SelectedAlarm = Alarms[LastAlarmSent + 1]; 
      } 
      catch (Exception ex) 
      { 
       _viewManager.ShowDialog(new MessageDialogViewModel() 
       { 
        AskAnswer = false, 
        Text = ex.Message, 
        Title = TranslatedResources.AlarmAckSendErrorTitle, 
       }); 
      } 

     } 
    } 

Answer 1

당신이 그것을 것 UserControl을 사용하여 속성을 초기화하면 내 생각이

public AlarmList() 
    { 
     InitializeComponent(); 

     Height = this.ActualHeight; 
    } 

또는 변경을 작동하여이 같은 CommandParameter :

CommandParameter="{Binding ActualHeight .....