删除或添加后刷新数据网格 - MVVM WPF [英] Refresh datagrid after deleting or adding - MVVM WPF

问题描述

您好，
 
从我的DataGrid中删除一行后，我遇到了刷新DataGrid的问题，

Voici mon XAML：

 <   DataGrid     x：名称  =  EmpDataGrid  
   
                      < span class =code-attribute>                           
   
                                               ItemsSource   =  {Binding loadDataBinding，Mode = TwoWay}                                         
   
                                               CanUserResizeRows   =  False   
   
                                               CanUserAddRows   =  False  
   
                                               SelectedItem   =  {Binding CurrentCustomer}    Grid.ColumnSpan   =  2  >  

ViewModel：







当我点击删除按钮时，Datagrid不刷新！并在我的数据库中删除



如何更正此错误？



谢谢



我尝试过：

< pre> private ObservableCollection< Custmor> _loadDataBinding; 
 
  public  ObservableCollection< Custmor> loadDataBinding 
 {
  get  
 {
  return  _loadDataBinding ; 
} 
  set  
 {_loadDataBinding =  value ; 
 OnPropertyChanged（  loadDataBinding）; 
} 
} 
 
 
  public  ViewModel1（）
 {
 < span class =code-comment> //   Affichage mon DataGrid  
 使用（Test1Entities context =  new  Test1Entities（））
 {
 _loadDataBinding =  new 的ObservableCollection< Custmor>（context.Custmor.ToList（））; 
} 
 
 deleteCustomer =  new  RelayCommand（delete，canexecute）; 
} 
 
  private  ICommand deleteCustomer; 
  public  ICommand DeleteCustomer 
 {
  get  { return  deleteCustomer; } 
} 
 
 
 私有  void  delete（  object  obj）
 {
 
 使用（Test1Entities context = < span class =code-keyword> new  Test1Entities（））
 {
 Custmor cus = context.Custmor.Find（currentCustomer.ID）; 
 context.Custmor.Remove（cus）; 
 context.SaveChanges（）; 
} 
} 
 
 
 私人 Custmor currentCustomer; 
 
  public  Custmor CurrentCustomer 
 {
  get  {  return  currentCustomer; } 
  set  
 {
 currentCustomer =  value ; 
 test = currentCustomer; 
 OnPropertyChanged（  CurrentCustomer）; 
} 
} 
 
 loadDataBinding.ToList（）; 

解决方案

你是从数据库中删除项目，但不从绑定到 DataGrid （ _loadDataBinding ）的集合中删除。您可以在 delete 方法中执行此操作：

 private void delete（object obj ）
 {
 
使用（Test1Entities context = new Test1Entities（））
 {
 Custmor cus = context.Custmor.Find（currentCustomer.ID）; 
 context.Custmor.Remove（cus）; 
 context.SaveChanges（）; 
} 
 
 //从集合中删除项目
  _loadDataBinding.Remove（CurrentCustomer）;  
 
} 

Hello,

After deleting a line from my DataGrid, I have a problem to  Refresh the DataGrid,

Voici mon XAML:

<DataGrid x:Name="EmpDataGrid"

                       

                      ItemsSource="{Binding loadDataBinding,Mode=TwoWay}"                   

                      CanUserResizeRows="False"

                      CanUserAddRows="False"

                      SelectedItem="{Binding CurrentCustomer}" Grid.ColumnSpan="2">

ViewModel:



And when I click the delete button, the Datagrid does not refresh !! and in my database is deleted

How will I correct this error?

Thanks

What I have tried:

<pre>private ObservableCollection<Custmor> _loadDataBinding;   
 
public ObservableCollection<Custmor> loadDataBinding
{
    get
    {
        return _loadDataBinding;
    }
    set
    {  _loadDataBinding = value;
        OnPropertyChanged("loadDataBinding");
    }
}
 
 
 public ViewModel1()
{
  //Affichage mon DataGrid
    using (Test1Entities context = new Test1Entities())
    {
        _loadDataBinding = new ObservableCollection<Custmor>(context.Custmor.ToList());
    }       
     
  deleteCustomer = new RelayCommand(delete, canexecute);   
}
 
private ICommand deleteCustomer;
public ICommand DeleteCustomer
{
    get { return deleteCustomer; }
}
 
 
private void delete(object obj)
{
 
    using (Test1Entities context = new Test1Entities())
    {          
        Custmor cus = context.Custmor.Find(currentCustomer.ID);
        context.Custmor.Remove(cus );
        context.SaveChanges();
    }
}
 
 
private Custmor currentCustomer;
 
public Custmor CurrentCustomer
{
    get { return currentCustomer; }
    set
    {
        currentCustomer = value;
        test = currentCustomer;
        OnPropertyChanged("CurrentCustomer");
    }
}
 
loadDataBinding.ToList();

解决方案

You are removing an item from the database, but not from the collection binded to your DataGrid (_loadDataBinding). You can do this in your delete method:

private void delete(object obj)
{
 
    using (Test1Entities context = new Test1Entities())
    {          
        Custmor cus = context.Custmor.Find(currentCustomer.ID);
        context.Custmor.Remove(cus );
        context.SaveChanges();
    }

    // remove item from collection
    _loadDataBinding.Remove(CurrentCustomer);

}

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