ADD后刷新数据网格 - MVVM WPF [英] Refresh datagrid after ADD - MVVM WPF

问题描述

Hi,
 
After adding a new Customer ,it is OK in my database but i want to refresh the DataGrid,

XAML：

XAML:

<pre><DataGrid x:Name="EmpDataGrid"

                       

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

                      CanUserResizeRows="False"

                      CanUserAddRows="False"

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

ViewModel：







当我完成功能ADD时，Datagrid不刷新！并添加了我的数据库中的客户





谢谢



< b>我尝试了什么：

ViewModel:



When i finish he function ADD, the Datagrid does not refresh !! and the Customer in my database is added


Thanks

What I have tried:

<pre lang="c#"><pre>        private ObservableCollection<Custmor> _loadDataBinding;    

        public ObservableCollection<Custmor> loadDataBinding
        {
            get
            {
                return _loadDataBinding;
            }
            set
            {  _loadDataBinding = value;
                OnPropertyChanged("loadDataBinding");
            }
        }
		
		
		
		 public ViewModel1()
        {
          //Display my DataGrid 
            using (Test1Entities context = new Test1Entities())
            {
                _loadDataBinding = new ObservableCollection<Custmor>(context.Custmor.ToList());
            }  
               
			   //To Show the Window ADD from Window MainWindow
            addCustomerMainWindow = new RelayCommand(add);          

            CustomerToAddObject = new Custmor();

            addCustomer1 = new RelayCommand(ADDFunction);         

		}
		
		//To Show the Window ADD from Window MainWindow
		  private ICommand addCustomerMainWindow;
          public ICommand AddCustomerMainWindow
        {
            get { return addCustomerMainWindow; }
        }

        private void add(object obj)
        {
          
            Add addView = new Add();           
            addView.Show();            
        }
		
		
		private Custmor customerToAddObject;

        public Custmor CustomerToAddObject
        {
            get { return customerToAddObject; }
            set { customerToAddObject = value; }
        }
		
		//The Button ADD from Window ADD
		
		private ICommand addCustomer1;
        public ICommand AddCustomer1
        {
            get { return addCustomer1; }
        }

        private void ADDFunction(object obj)
        {
            using (Test1Entities context = new Test1Entities())
            {
                context.Custmor.Add(customerToAddObject);
                context.SaveChanges();
            }
            
            _loadDataBinding.Add(CurrentCustomer);

        }

推荐答案

再次


$ b您的 ADDFunction 中的$ b，您要将 CurrentCustomer 添加到您的收藏中。我想这是一个错字，它应该是 customerToAddObject 你要添加到数据库的对象。



另外，你可能想要在添加时创建一个对象，而不是在你的构造函数中。

Hi again,

in your ADDFunction, you are adding CurrentCustomer to your collection. I guess it's a typo and it should be customerToAddObject object you are adding to your database.

Also, you may want to create an object in the time of adding, not in your constructor.

private void ADDFunction(object obj)
{
    // create new object before adding
    customerToAddObject = new Custmor();
    using (Test1Entities context = new Test1Entities())
    {
        context.Custmor.Add(customerToAddObject);
        context.SaveChanges();
    }
    
    // add correct instance to your binded collection
    _loadDataBinding.Add(customerToAddObject);
}

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