Question

我有MainWindow和Window Add，ViewModel和ViewModelADD..l'添加新客户在数据库中是正确的，但DataGrid的刷新没有！当我完成l'时，Window ADD不会关闭！

视图模型：

private static ViewModel1 instance = new ViewModel1();
public static ViewModel1 Instance { get { return instance; } }

private void add(object obj)
{
    Add addView = new Add();
    addView.DataContext = new ViewModelADD(loadDataBinding);
    addView.Show();
}

private ObservableCollection<Custmor> _loadDataBinding;

public ObservableCollection<Custmor> loadDataBinding
{
    get
    {
        return _loadDataBinding;
    }

    set
    {
        _loadDataBinding = value;
        OnPropertyChanged("loadDataBinding");
    }
}

ViewModelADD：

public ViewModelADD(ObservableCollection<Custmor> loadDataBinding)
{
    CustomerToAddObject = new Custmor();

    addCustomer1 = new RelayCommand(ADDFunction);
}


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();

    }

    ViewModel1.Instance.loadDataBinding.Add(customerToAddObject);

    if (addView != null)
        addView.Close();
    CustomerToAddObject = new Custmor();

我尝试使用以下命令刷新DataGrid： ViewModel1.Instance.loadDataBinding.Add(customerToAddObject);

并尝试关闭Window ADD，我尝试：

if (addView != null)
    addView.Close();
CustomerToAddObject = new Custmor();

但问题仍然存在：dataGrid没有刷新，Window ADD没有关闭..数据库中的保存是正确的

Answer 1

将对象添加到注入ViewModelADD的集合中：

private readonly ObservableCollection<Custmor> _loadDataBinding;
public ViewModelADD(ObservableCollection<Custmor> loadDataBinding)
{
    CustomerToAddObject = new Custmor();
    addCustomer1 = new RelayCommand(ADDFunction);
    _loadDataBinding = loadDataBinding;   
}

...


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

由于您从视图模型中打开窗口，您也可以注入窗口：

private readonly Window _window;
private readonly ObservableCollection<Custmor> _loadDataBinding;
public ViewModelADD(Window window, ObservableCollection<Custmor> loadDataBinding)
{
    CustomerToAddObject = new Custmor();
    addCustomer1 = new RelayCommand(ADDFunction);
    _window = window;
    _loadDataBinding = loadDataBinding;   
}
...


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

从ViewModel fils MVVM WPF刷新DataGrid

1 个答案: