我有多个复选框，可根据数据库值进行选中/取消选中。 现在我想使用MVVM将检查的值（通过将未检查的值作为选中）保存到数据库中。 我试过这样的： -
的Xaml
<Window.DataContext>
<VM:UserModuleMappingViewModel></VM:UserModuleMappingViewModel>
</Window.DataContext>
<Grid>
<Grid.ColumnDefinitions>
</Grid.ColumnDefinitions>
<Label FontSize="17" Content="User Id:" Margin="30,10,187,203" RenderTransformOrigin="0.499,1.597" Grid.Row="1"/>
<Label FontSize="15" Grid.Column="0" Content="Modules:" RenderTransformOrigin="0.499,1.597" Grid.Row="1" Margin="30,56,187,150"/>
<ComboBox Name="cmbuserId" Height="25" Width="120"
ItemsSource="{Binding ListData}" SelectedItem="{Binding SelectedItem}"
DisplayMemberPath="UserId" VerticalAlignment="Top" Margin="123,16,49,0"/>
<ListBox Name="list" ItemsSource="{Binding comboBoxItems}" Margin="127,65,53,92" SelectionMode="Extended" Height="300" Width="300">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<CheckBox Name="checkModules" Content="{Binding Module_name }"
Margin="3" VerticalAlignment="Center" Command="{Binding checkedCommand}"
IsChecked="{Binding Path=IsSelected, Mode=TwoWay}"/>
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
<Button Content="Save" Command="{Binding AddCommand}" ToolTip="Save" Margin="140,0,120,26" Width="40" Height="21" VerticalAlignment="Bottom"/>
</Grid>
模型
class UserModuleMapping : INotifyPropertyChanged
{
public string user_id { get; set; }
public string Module_name { get; set; }
public string Module_Id { get; set; }
public string UserId { get; set; }
private bool isSelected;
public bool IsSelected
{
get { return isSelected; }
set
{
isSelected = value;
OnPropertyChanged("IsSelected");
}
}
private ObservableCollection<UserModuleMapping> _listData;
public ObservableCollection<UserModuleMapping> ListData
{
get { return _listData; }
set { _listData = value; OnPropertyChanged("ListData"); }
}
public ObservableCollection<UserModuleMapping> GetListData()
{
ListData = new ObservableCollection<UserModuleMapping>();
string constr = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
using (SqlConnection con = new SqlConnection(constr))
{
string qry = "";
qry = "select User_Id,EMP_Name from User_Id";
con.Open();
SqlCommand cmd = new SqlCommand();
SqlDataAdapter sa = new SqlDataAdapter(qry, con);
DataTable dt = new DataTable();
sa.Fill(dt);
for (int i = 0; i < dt.Rows.Count; i++)
{
UserModuleMapping ck = new UserModuleMapping();
ck.UserId = dt.Rows[i]["User_Id"].ToString();
ListData.Add(ck);
}
return ListData;
}
}
//---------------------------for checkbox generation---------------------------------
private ObservableCollection<UserModuleMapping> _modulesData;
public ObservableCollection<UserModuleMapping> ModulesData
{
get { return _modulesData; }
set { _modulesData = value; OnPropertyChanged("ModulesData"); }
}
public ObservableCollection<UserModuleMapping> getModules()
{
ModulesData = new ObservableCollection<UserModuleMapping>();
string constr = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
using (SqlConnection con = new SqlConnection(constr))
{
string qry = "";
qry = "select * from [dbo].[Module_Mstr]";
con.Open();
SqlCommand cmd = new SqlCommand();
SqlDataAdapter sa = new SqlDataAdapter(qry, con);
DataTable dt = new DataTable();
sa.Fill(dt);
for (int i = 0; i < dt.Rows.Count; i++)
{
UserModuleMapping cl = new UserModuleMapping();
cl.Module_name = dt.Rows[i]["Module_Name"].ToString();
cl.IsSelected = true;
ModulesData.Add(cl);
//IEnumerable<String> selectedData = ModulesData.Where(d => d.IsSelected).Select(d => d.Module_name);
}
return ModulesData;
}
}
//--------------------end------------------------------------------------------------
//---------------------------for combobox change based checkbox-----------------------
private ObservableCollection<UserModuleMapping> _userModule;
public ObservableCollection<UserModuleMapping> UserModule
{
get { return _userModule; }
set { _userModule = value; OnPropertyChanged("UserModule"); }
}
public ObservableCollection<UserModuleMapping> getuserModules(string user_id)
{
UserModule = new ObservableCollection<UserModuleMapping>();
string constr = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
using (SqlConnection con = new SqlConnection(constr))
{
string qry = "";
qry = " select umap.User_Id,umap.Module_Id,mod_mstr.Module_Name from Module_Mstr mod_mstr left" +
" join [dbo].[UserModule_Map] umap on mod_mstr.Module_Id = umap.Module_Id and umap.User_Id = '" + user_id + "'";
con.Open();
SqlCommand cmd = new SqlCommand();
SqlDataAdapter sa = new SqlDataAdapter(qry, con);
DataTable dt = new DataTable();
sa.Fill(dt);
for (int i = 0; i < dt.Rows.Count; i++)
{
UserModuleMapping cli = new UserModuleMapping();
cli.Module_name = dt.Rows[i]["Module_Name"].ToString();
cli.Module_Id = dt.Rows[i]["Module_Id"].ToString();
if (cli.Module_Id == "" || cli.Module_Id == null)
{
cli.IsSelected = false;
}
else
{
cli.IsSelected = true;
}
UserModule.Add(cli);
//IEnumerable<String> selectedData = UserModule.Where(d => d.IsSelected).Select(d => d.Module_name);
}
return UserModule;
}
}
//--------------------end------------------------------------------------------------
//private ObservableCollection<UserModuleMapping> data;
//public ObservableCollection<UserModuleMapping> Data
//{
// get { return data; }
// set { data = value; OnPropertyChanged("Data"); }
//}
public event PropertyChangedEventHandler PropertyChanged;
protected void OnPropertyChanged(string propertyName)
{
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
}
视图模型
class UserModuleMappingViewModel : ModelBase
{
public string userid { get; set; }
public ObservableCollection<UserModuleMapping> comboBoxItems { get; set; }
public ObservableCollection<UserModuleMapping> checkboxItems { get; set; }
public ObservableCollection<UserModuleMapping> checkboxCommand { get; set; }
public ICommand GetData { get; set; }
public ICommand GetMod { get; set; }
public UserModuleMapping _selectedItem;
public UserModuleMapping SelectedItem
{
get { return _selectedItem; }
set
{
_selectedItem = value;
GetUserModules();
OnPropertyChanged("comboBoxItems");
}
}
private ObservableCollection<UserModuleMapping> _listData;
public ObservableCollection<UserModuleMapping> ListData
{
get { return _listData; }
set { _listData = value; OnPropertyChanged("ListData"); }
}
private ObservableCollection<UserModuleMapping> _modulesData;
public ObservableCollection<UserModuleMapping> ModulesData
{
get { return _modulesData; }
set { _modulesData = value; OnPropertyChanged("UserModuleMappi"); }
}
private ObservableCollection<UserModuleMapping> _userModules;
public ObservableCollection<UserModuleMapping> UserModules
{
get { return _userModules; }
set { _userModules = value; OnPropertyChanged("UserModules"); }
}
public UserModuleMappingViewModel()
{
GetListData();
GetModulesData();
}
public void GetListData()
{
ListData = new ObservableCollection<UserModuleMapping>();
UserModuleMapping model = new UserModuleMapping();
ListData = model.GetListData();
}
public void GetModulesData()
{
ModulesData = new ObservableCollection<UserModuleMapping>();
UserModuleMapping model = new UserModuleMapping();
comboBoxItems = new ObservableCollection<UserModuleMapping>(model.getModules());
}
public void GetUserModules()
{
UserModules = new ObservableCollection<UserModuleMapping>();
UserModuleMapping model = new UserModuleMapping();
comboBoxItems = new ObservableCollection<UserModuleMapping>(model.getuserModules(_selectedItem.UserId));
}
private RelayCommand addCommand;
public ICommand AddCommand
{
get { return addCommand ?? (addCommand = new RelayCommand(() => saveuserModules())); }
}
//-------------------------save checkbox values------------------------------
private ObservableCollection<UserModuleMapping> _saveUserMappingModules;
public ObservableCollection<UserModuleMapping> SaveUserModule
{
get { return _saveUserMappingModules; }
set { _saveUserMappingModules = value; OnPropertyChanged("UserModule"); }
}
public ObservableCollection<UserModuleMapping> saveuserModules()
{
UserModuleMapping model = new UserModuleMapping();
SaveUserModule = new ObservableCollection<UserModuleMapping>();
if (SelectedItem.UserId != null || SelectedItem.UserId != "")
{
SaveUserModule = new ObservableCollection<UserModuleMapping>(model.getuserModules(_selectedItem.UserId));
//if (model.IsSelected == false)
//{
checkboxCommand = new ObservableCollection<UserModuleMapping>(model.getuserModules(_selectedItem.UserId));
IEnumerable<String> selectedData = SaveUserModule.Where(d => d.IsSelected).Select(d => d.Module_name);
foreach (var items in SaveUserModule)
{
UserModuleMapping mapp = new UserModuleMapping();
mapp.user_id = items.user_id;
mapp.Module_name = items.Module_name;
SaveUserModule.Add(mapp);
}
}
else
{
}
return SaveUserModule;
}
}
“selectedData”应具有已选中和未选中的值。我将如何实现这一目标？