数据网格没有使用对话框按钮命令更新

Question

我正在做一个WPF应用程序。其中我使用数据网格，它被绑定到一个集合customerCollection。我使用MVVM

我有一个按钮来添加一个新客户，点击它会显示一个对话框。通过对话框，我保存数据到我的SQL服务器数据库。一切正常，但是当对话框关闭时(CloseAction();)． 数据网格不更新。我该怎么办?当我返回到任何其他菜单项并单击customer时，Datagrid被更新，而我在构造函数和命令执行中调用相同的函数。附上图片供参考

public CustomerViewModel()
{            
ShowNewCustomerWindowCommand = new ViewModelCommand(ExecuteShowNewCustomerWindowCommand);
SearchCustomerCommand = new ViewModelCommand(ExecuteSearchCustomerCommand);
GetData();            
}
protected void GetData()
{
customer = new ObservableCollection<CustomerModel>();
customer = customerRepository.GetByAll();
customerCollection = CollectionViewSource.GetDefaultView(customer);
customerCollection.Filter = FilterByName;
customerCollection.Refresh();
RaiseProperChanged();           
}
private void ExecuteShowNewCustomerWindowCommand(object obj)
{
var addNewCustomer = new AddNewCustomer();
addNewCustomer.ShowDialog();
}
private void ExecuteSaveCustomerCommand(object obj)
{
customerModel.FirstName = FirstName;
customerModel.LastName = LastName;
customerModel.Contact = Contact;
customerModel.Address = Address;
customerRepository.Add(customerModel);
CloseAction();
GetData();
}

Answer 1

我只是猜测，因为您没有发布任何xaml或属性。我假设你至少有一个公共属性CustomerCollection和你的数据网格绑定到它。我会将代码更改为以下内容:

public CustomerViewModel()
{     
customer = new ObservableCollection<CustomerModel>(); 
customerCollection = CollectionViewSource.GetDefaultView(customer);
customerCollection.Filter = FilterByName;  
ShowNewCustomerWindowCommand = new ViewModelCommand(ExecuteShowNewCustomerWindowCommand);
SearchCustomerCommand = new ViewModelCommand(ExecuteSearchCustomerCommand);
GetData();            
}
public ICollectionView CustomerCollection {get; init;}
protected void GetData()
{
customer.Clear(); 
customer.AddRange(customerRepository.GetByAll());

customerCollection.Refresh();

}
private void ExecuteShowNewCustomerWindowCommand(object obj)
{
var addNewCustomer = new AddNewCustomer();
addNewCustomer.ShowDialog();
}

private void ExecuteSaveCustomerCommand(object obj)
{
customerModel.FirstName = FirstName;
customerModel.LastName = LastName;
customerModel.Contact = Contact;
customerModel.Address = Address;
customerRepository.Add(customerModel);
CloseAction();
GetData();
}

xaml

<DataGrid ItemsSource="{Binding CustomerCollection, Mode=OneWay}"

• init ObservableCollection and ICollectionView once in tor
• 使用.Clear()代替新实例
• 添加customerRepository.GetByAll()