如何清理网格内容 [英] How to clean grid content

问题描述

我的网格为：

< DockPanel Height =   280 >  
< Border CornerRadius =   6 BorderBrush =  灰色 removed =   LightGray BorderThickness =   2 >  
< ScrollViewer VerticalScrollBarVisibility =  自动 >  
< ItemsControl Height =   400名称=   icTodoList ItemsSource =   {Binding Items} >  
< ItemsControl.ItemTemplate> ; 
< DataTemplate> 
<网格名称=   ToDoList  >  
< Grid.RowDefinitions> 
< RowDefinition Height =   * /> 
< RowDefinition Height =   * /> 
< RowDefinition Height =   * /> 
< RowDefinition Height =   * /> 
 < /   Grid.RowDefinitions  >  
< TextBlock Text =   {Binding StartTime，FallbackValue =''} Grid.Row =   0 /> 
< TextBlock Text =   {Binding ConnectedTime，FallbackValue =''}网格。 Row =   1 /> 
< TextBlock Text =   {Binding DisconnectedTime，FallbackValue =''}网格。 Row =   2 /> 
< TextBlock Text =   {Binding DialingResult，FallbackValue =''}网格。 Row =   3 /> 
 < /  网格 >  
 < /   DataTemplate  >  
 < /   ItemsControl.ItemTemplate  >  
 < /   ItemsControl  >  
 < /   ScrollViewer  >  
 < /   Border  >  
 < /   DockPanel  >  
 

点击按钮开始进程中，一些内容被添加到网格中，但是下一次新的东西被添加到旧网格之后。我不想那样;我想点击按钮后清理网格，所以布局总是显示新内容。



如何？



编辑：

我使用MVVM模式。

  public  ObservableCollection< Calls> items =  new  ObservableCollection< Calls>（）; 
  public  ObservableCollection< Calls>商品
 {
 获取 {返回项; } 
  set  
 {
 items =  value ; 
 RaisePropertyChanged（）; 
} 
} 
 

在后面的代码中：

 MainViewModel _dataContext; 
调用c =  new  Calls（）; 
  //   blah blah  
 Dispatcher.BeginInvoke（（Action）委托（）
 {
  if （c！=  null ）
 _dataContext.Items.Add（c）; 
}）; 

解决方案

< blockquote>请参阅此文章：重置视图模型WPF MVVM应用程序中没有代码隐藏的视图 [ ^ ]

我得到了一个简单的解决方案。

在添加之前，使用一行代码就足够了。

 _ dataContext.Items.Clear（）; 

I have the grid as:

<DockPanel Height="280">
          <Border CornerRadius="6" BorderBrush="Gray" removed="LightGray" BorderThickness="2" >
              <ScrollViewer VerticalScrollBarVisibility="Auto">
                  <ItemsControl Height="400" Name="icTodoList" ItemsSource="{Binding Items}">
                      <ItemsControl.ItemTemplate>
                          <DataTemplate>
                              <Grid Name="ToDoList">
                                  <Grid.RowDefinitions>
                                      <RowDefinition Height="*"/>
                                      <RowDefinition Height="*"/>
                                      <RowDefinition Height="*"/>
                                      <RowDefinition Height="*"/>
                                  </Grid.RowDefinitions>
                                  <TextBlock Text="{Binding StartTime, FallbackValue=' '}" Grid.Row="0"/>
                                  <TextBlock Text="{Binding ConnectedTime, FallbackValue=' '}" Grid.Row="1"/>
                                  <TextBlock Text="{Binding DisconnectedTime, FallbackValue=' '}" Grid.Row="2"/>
                                  <TextBlock Text="{Binding DialingResult, FallbackValue=' '}" Grid.Row="3"/>
                              </Grid>
                          </DataTemplate>
                      </ItemsControl.ItemTemplate>
                  </ItemsControl>
              </ScrollViewer>
          </Border>
      </DockPanel>

By clicking a button to start a process, some contents are add to the grid, But next time new stuffs are appended after the old ones. I don't want that; I want to clean up the grid once I click the button, so the layout always show the new contents.

How?

EDIT:
I used MVVM pattern.

public ObservableCollection<Calls> items = new ObservableCollection<Calls>();
   public ObservableCollection<Calls> Items
   {
       get { return items; }
       set
       {
           items = value;
           RaisePropertyChanged();
       }
   }

And in the code behind:

MainViewModel _dataContext;
Calls c = new Calls();
// blah blah
 Dispatcher.BeginInvoke((Action)delegate()
        {
            if (c != null)
                _dataContext.Items.Add(c);
        });

解决方案

Please, see this article: Resetting a View Model in WPF MVVM applications without code-behind in the view[^]

I got a simple solution.
Before adding, using one line code is enough.

_dataContext.Items.Clear();

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