2012-01-06 151 views
0

我有一個Silverlight頁面,其中包含一個DataGrid。它綁定到一個ViewModel.On的ViewModel的初始化我已經調用RIA服務來從數據庫中獲取所有記錄。我有另一個按鈕頁面,它會在click上打開一個子窗體。該子窗體包含向數據庫添加記錄的DataForm,再次成功添加記錄後,我使用RIA Services和RaisedPropertyChanged事件獲取所有記錄。但DataGrid不顯示新記錄。什麼是問題,爲什麼DataGrid沒有得到刷新...視圖和viewmodel的代碼寫在下面。刷新DataGrid MVVM Silverlight

//XAML of View 
<sdk:DataGrid x:Name="grd_classes" ItemsSource="{Binding Classes,Mode=TwoWay}" AutoGenerateColumns="False" Width="300" Grid.Column="1" > 
      <sdk:DataGrid.Columns> 
       <sdk:DataGridTextColumn Header="Class Name" Width="140" Binding="{Binding Name,Mode=TwoWay}" CanUserReorder="True" CanUserResize="True" CanUserSort="True" /> 
       <sdk:DataGridTextColumn Header="Alias" Width="140" Binding="{Binding Alias,Mode=TwoWay}" CanUserReorder="True" CanUserResize="True" CanUserSort="True" /> 
      </sdk:DataGrid.Columns> 
     </sdk:DataGrid> 

//Code of viewmodel 
namespace SMS.ViewModel 
{ 
    public class ClassesViewModel:ViewModel 
    { 
     private ClassesContext _context = new ClassesContext(); 

     public ClassesViewModel() 
     { 



      _context.Load<Class>(_context.GetClassesQuery(), OnLoad, true); 

     } 



     public EntitySet<Class> Classes 
     { 
      get 
      { 
       return _context.Classes; 
      } 
     } 





    public void AddNewClass(object parameter) 
     { 
      for (int i = 0; i <= newClass.Count - 1;i++) 
      { 
       _context.Classes.Add(newClass[i]); 
      } 
      _context.SubmitChanges(OnSave,null); 

     } 

     private void OnLoad(LoadOperation op) 
     { 
       if (!op.HasError) 
       { 

        RaisePropertyChanged("Classes"); 
       } 

     } 
    private void OnSave(SubmitOperation op) 
     { 
      if (op.IsComplete) 
      { 
       if (op.HasError) 
       { 
        MessageBox.Show("Error"); 
       } 
       else 
       { 
        _context = new ClassesContext(); 
        _context.Load<Class>(_context.GetClassesQuery(), OnLoad, true); 

        DialogResult = true; 
       } 
      } 

     } 





    } 
} 
+0

您是否在'OnLoad'中執行'RaisePropertyChanged'後檢查是否調用'Classes'的getter? – dmusial 2012-01-07 12:38:14

+0

也驗證Classes.Count> 0 – codeSetter 2012-01-07 15:46:07

回答

0

你有沒有設置grd_classes DataContext?還需要RaisePropertychanged事件以及

_context.Load<Class>(_context.GetClassesQuery(), OnLoad, true); 
RaisePropertyChanged(() => Classes); 
+0

網格grd_classes有itemSources類,我已經提出屬性更改事件LoadOperation _context後 – 2012-01-07 04:57:55