c# - 添加新的客户MVVM WPF后刷新Datagrid

Question

这是我的看法



XAML查看主:

<DataGrid AutoGenerateColumns="false" 
          SelectedItem="{Binding Selectedrole}"
          ItemsSource="{Binding RoleList}">
  <Button Content="Add Role"
          Command="{Binding  AddRole}"
          Height="35"/>
</DataGrid>

ViewModel主:

public RoleManagementViewModel()
{
    roleList = new ObservableCollection<UserRoleClass>(WCFclient.GetAllRoles());
    _addRole = new RelayCommand<string>(AddRoleFunction);           
}    

private void AddRoleFunction(object obj)
{
    if (!Application.Current.Windows.OfType<SelectionCompartementView>().Any())
    {              
        AddRoleView winAddRole = new AddRoleView();
        winAddRole.DataContext = new AddRoleViewModel();
        winAddRole.Show();
        winAddRole.Topmost = true;
        winAddRole.Focus();
    }           
}

public ObservableCollection<UserRoleClass> RoleList
{
    get { return roleList; }
    set
    {
        roleList = value;
        OnPropertyChanged("RoleList");
    }
}

View 添加角色:


Xaml角色:

<Button x:Name="button1"
        Command="{Binding SaveRole}"
        CommandParameter="{Binding ElementName=AddRole}"/>

ViewModel角色:

public AddRoleViewModel()
{
    _addOrUpdate = new UserRoleClass();
    _addOrUpdate = new UserRoleClass();
    saveRole = new RelayCommand<Window>(addFunc);
}

private void addFunc(Window window)
{
    UserRoleClass newRole = new UserRoleClass()
    {
        name = AddOrUpdate.name,
        description = AddOrUpdate.description,
    };                                             
    int resultSave = WCFclient.saveRole(newRole);          
    if (resultSave == 0)
    {
        String UpdateInformation0 = "Role is saved successfully";
        string sCaption = "Save Role";
        MessageBoxButton btnMessageBox = MessageBoxButton.OK;
        MessageBoxImage icnMessageBox = MessageBoxImage.Information;
        MessageBoxResult rsltMessageBox = MessageBox.Show(
            UpdateInformation0, sCaption, btnMessageBox, icnMessageBox);
    }
    if (window != null)
    {
        window.Close();
    }
}    

private ICommand saveRole;
public ICommand SaveRole
{
    get { return saveRole; }
}

它工作正常:当我添加一个新的Role时，Add-Role View 关闭并返回到Main View ，并且我在数据库中有一个结果...但是在MainView中的DataGrid中却没有。

如何直接刷新？

Answer 1

首先，为什么有以下两行？_addOrUpdate = new UserRoleClass();
其次，当您保存新角色时，似乎正在调用将其保存到数据库的WCF服务。
您正在使用一个可观察的集合，当您将其添加到该集合时，该集合应该会更新，但是我看不到您的代码将新角色添加到RoleList中。