C# ListView未在WPF中更新
下面是我的视图代码。我的列表在后端被设置和更新，但它并没有反映在前端，即使我将其与ListItems绑定在一起。 你能告诉我为什么会这样吗？如果您需要其他文件，请告诉我 ListOfVehicle.xaml //静态变量C# ListView未在WPF中更新,c#,wpf,mvvm,C#,Wpf,Mvvm,下面是我的视图代码。我的列表在后端被设置和更新，但它并没有反映在前端，即使我将其与ListItems绑定在一起。 你能告诉我为什么会这样吗？如果您需要其他文件，请告诉我 ListOfVehicle.xaml //静态变量 private static bool _IsEnableReplaceButton; public static bool IsEnableReplaceButton { get { return _IsEnableReplaceBut
private static bool _IsEnableReplaceButton;
public static bool IsEnableReplaceButton
{
get { return _IsEnableReplaceButton; }
set { _IsEnableReplaceButton = value; }
}
private string _VehicleNo_Error;
public string VehicleNo_Error
{
get { return _VehicleNo_Error; }
set { _VehicleNo_Error = value; OnPropertyChanged("VehicleNo_Error"); }
}
private string _Model_Error;
public string Model_Error
{
get { return _Model_Error; }
set { _Model_Error = value; OnPropertyChanged("Model_Error"); }
}
private string _ManufacturingDate_Error;
public string ManufacturingDate_Error
{
get { return _ManufacturingDate_Error; }
set { _ManufacturingDate_Error = value; OnPropertyChanged("ManufacturingDate_Error"); }
}
private string _IUNo_Error;
public string IUNo_Error
{
get { return _IUNo_Error; }
set { _IUNo_Error = value; OnPropertyChanged("IUNo_Error"); }
}
private string _Personnel_Error;
public string Personnel_Error
{
get { return _Personnel_Error; }
set { _Personnel_Error = value; OnPropertyChanged("Personnel_Error"); }
}
private string _ErroMesage;
public string ErrorMessage
{
get { return _ErroMesage; }
set
{
_ErroMesage = value; OnPropertyChanged("ErrorMessage");
if (ErrorMessage.Trim() == "" || ErrorMessage == null)
HelpVisibility = "hidden";
else
HelpVisibility = "visible";
}
}
private string _HelpVisibility;
public string HelpVisibility
{
get { return _HelpVisibility; }
set { _HelpVisibility = value; OnPropertyChanged("HelpVisibility"); }
}
private static AddVehicle _addVehicle;
public static AddVehicle addVehicle
{
get
{
return _addVehicle;
}
set
{
_addVehicle = value;
}
}
// Form Components
private Guid? _UniqueNo;
public Guid? UniqueNo
{
get { return _UniqueNo; }
set
{
if (value == null || (!value.Equals(_UniqueNo)))
{
_UniqueNo = value;
OnPropertyChanged("UniqueNo");
}
}
}
private string _VehicleNo;
public string VehicleNo
{
get { return _VehicleNo; }
set
{
if (value == null || (!value.Equals(_VehicleNo)))
{
_VehicleNo = value;
EditText = _VehicleNo;
OnPropertyChanged("VehicleNo");
validateSpecificData(1);
}
}
}
private string _Model;
public string Model
{
get { return _Model; }
set
{
if (value == null || (!value.Equals(_Model)))
{
_Model = value;
EditText = _Model;
OnPropertyChanged("Model");
validateSpecificData(2);
}
}
}
private DateTime? _ManufacturingDate;
public DateTime? ManufacturingDate
{
get { return _ManufacturingDate; }
set
{
if (value == null || (!value.Equals(_ManufacturingDate)))
{
_ManufacturingDate = value;
EditText = _ManufacturingDate.ToString();
OnPropertyChanged("ManufacturingDate");
validateSpecificData(3);
}
}
}
private string _IUNo;
public string IUNo
{
get { return _IUNo; }
set
{
if (value == null || (!value.Equals(_IUNo)))
{
_IUNo = value;
EditText = _IUNo;
OnPropertyChanged("IUNo");
validateSpecificData(4);
}
}
}
private string _PersonnelNameSelected;
public string PersonnelNameSelected
{
get { return _PersonnelNameSelected; }
set
{
if (value != _PersonnelNameSelected)
{
_PersonnelNameSelected = value;
EditText = _PersonnelNameSelected;
OnPropertyChanged("PersonnelNameSelected");
}
}
}
private ObservableCollection<string> _PersonnelName;
public ObservableCollection<string> PersonnelName
{
get { return _PersonnelName; }
set
{
if (value != _PersonnelName)
{
_PersonnelName = value;
EditText = _VehicleNo;
OnPropertyChanged("PersonnelName");
}
}
}
private ObservableCollection<VehicleModel> _listItems;
public ObservableCollection<VehicleModel> ListItems
{
get { return _listItems; }
set
{
if (value == null || (!value.Equals(_listItems)))
{
_listItems = value;
}
}
}
// Other Variables
private string _EditText;
public string EditText
{
get { return _EditText; }
set
{
if (value != _EditText)
{
_EditText = value;
OnPropertyChanged("EditText");
}
}
}
private VehicleModel _SelectedRow;
public VehicleModel SelectedRow
{
get { return _SelectedRow; }
set
{
if (value != _SelectedRow)
{
_SelectedRow = value;
OnPropertyChanged("SelectedRow");
if (SelectedRow != null)
{
UniqueNo = _SelectedRow.UniqueNo;
VehicleNo = _SelectedRow.VehicleNo;
Model = _SelectedRow.Model;
ManufacturingDate = _SelectedRow.ManufacturingDate;
IUNo = _SelectedRow.IUNo;
PersonnelNameSelected = _SelectedRow.PersonnelNameSelected;
_IsEnableReplaceButton = true;
}
}
}
}
private int _Progress;
public int Progress
{
get { return _Progress; }
set { _Progress = value; OnPropertyChanged("Progress"); }
}
#endregion
// Command Variables
private ICommand _saveButton_Command;
public ICommand SaveButton_Command
{
get { return _saveButton_Command; }
set { _saveButton_Command = value; }
}
private ICommand _ReplaceButton_Command;
public ICommand ReplaceButton_Command
{
get { return _ReplaceButton_Command; }
set { _ReplaceButton_Command = value; }
}
private ICommand _RemoveButton_Command;
public ICommand RemoveButton_Command
{
get { return _RemoveButton_Command; }
set { _RemoveButton_Command = value; }
}
private ICommand _OpenAddWindow_Command;
public ICommand OpenAddWindow_Command
{
get { return _OpenAddWindow_Command; }
set { _OpenAddWindow_Command = value; }
}
#region Methods
private static bool _IsEnableReplaceButton;
public static bool IsEnableReplaceButton
{
get { return _IsEnableReplaceButton; }
set { _IsEnableReplaceButton = value; }
}
private string _VehicleNo_Error;
public string VehicleNo_Error
{
get { return _VehicleNo_Error; }
set { _VehicleNo_Error = value; OnPropertyChanged("VehicleNo_Error"); }
}
private string _Model_Error;
public string Model_Error
{
get { return _Model_Error; }
set { _Model_Error = value; OnPropertyChanged("Model_Error"); }
}
private string _ManufacturingDate_Error;
public string ManufacturingDate_Error
{
get { return _ManufacturingDate_Error; }
set { _ManufacturingDate_Error = value; OnPropertyChanged("ManufacturingDate_Error"); }
}
private string _IUNo_Error;
public string IUNo_Error
{
get { return _IUNo_Error; }
set { _IUNo_Error = value; OnPropertyChanged("IUNo_Error"); }
}
private string _Personnel_Error;
public string Personnel_Error
{
get { return _Personnel_Error; }
set { _Personnel_Error = value; OnPropertyChanged("Personnel_Error"); }
}
private string _ErroMesage;
public string ErrorMessage
{
get { return _ErroMesage; }
set
{
_ErroMesage = value; OnPropertyChanged("ErrorMessage");
if (ErrorMessage.Trim() == "" || ErrorMessage == null)
HelpVisibility = "hidden";
else
HelpVisibility = "visible";
}
}
private string _HelpVisibility;
public string HelpVisibility
{
get { return _HelpVisibility; }
set { _HelpVisibility = value; OnPropertyChanged("HelpVisibility"); }
}
private static AddVehicle _addVehicle;
public static AddVehicle addVehicle
{
get
{
return _addVehicle;
}
set
{
_addVehicle = value;
}
}
// Form Components
private Guid? _UniqueNo;
public Guid? UniqueNo
{
get { return _UniqueNo; }
set
{
if (value == null || (!value.Equals(_UniqueNo)))
{
_UniqueNo = value;
OnPropertyChanged("UniqueNo");
}
}
}
private string _VehicleNo;
public string VehicleNo
{
get { return _VehicleNo; }
set
{
if (value == null || (!value.Equals(_VehicleNo)))
{
_VehicleNo = value;
EditText = _VehicleNo;
OnPropertyChanged("VehicleNo");
validateSpecificData(1);
}
}
}
private string _Model;
public string Model
{
get { return _Model; }
set
{
if (value == null || (!value.Equals(_Model)))
{
_Model = value;
EditText = _Model;
OnPropertyChanged("Model");
validateSpecificData(2);
}
}
}
private DateTime? _ManufacturingDate;
public DateTime? ManufacturingDate
{
get { return _ManufacturingDate; }
set
{
if (value == null || (!value.Equals(_ManufacturingDate)))
{
_ManufacturingDate = value;
EditText = _ManufacturingDate.ToString();
OnPropertyChanged("ManufacturingDate");
validateSpecificData(3);
}
}
}
private string _IUNo;
public string IUNo
{
get { return _IUNo; }
set
{
if (value == null || (!value.Equals(_IUNo)))
{
_IUNo = value;
EditText = _IUNo;
OnPropertyChanged("IUNo");
validateSpecificData(4);
}
}
}
private string _PersonnelNameSelected;
public string PersonnelNameSelected
{
get { return _PersonnelNameSelected; }
set
{
if (value != _PersonnelNameSelected)
{
_PersonnelNameSelected = value;
EditText = _PersonnelNameSelected;
OnPropertyChanged("PersonnelNameSelected");
}
}
}
private ObservableCollection<string> _PersonnelName;
public ObservableCollection<string> PersonnelName
{
get { return _PersonnelName; }
set
{
if (value != _PersonnelName)
{
_PersonnelName = value;
EditText = _VehicleNo;
OnPropertyChanged("PersonnelName");
}
}
}
private ObservableCollection<VehicleModel> _listItems;
public ObservableCollection<VehicleModel> ListItems
{
get { return _listItems; }
set
{
if (value == null || (!value.Equals(_listItems)))
{
_listItems = value;
}
}
}
// Other Variables
private string _EditText;
public string EditText
{
get { return _EditText; }
set
{
if (value != _EditText)
{
_EditText = value;
OnPropertyChanged("EditText");
}
}
}
private VehicleModel _SelectedRow;
public VehicleModel SelectedRow
{
get { return _SelectedRow; }
set
{
if (value != _SelectedRow)
{
_SelectedRow = value;
OnPropertyChanged("SelectedRow");
if (SelectedRow != null)
{
UniqueNo = _SelectedRow.UniqueNo;
VehicleNo = _SelectedRow.VehicleNo;
Model = _SelectedRow.Model;
ManufacturingDate = _SelectedRow.ManufacturingDate;
IUNo = _SelectedRow.IUNo;
PersonnelNameSelected = _SelectedRow.PersonnelNameSelected;
_IsEnableReplaceButton = true;
}
}
}
}
private int _Progress;
public int Progress
{
get { return _Progress; }
set { _Progress = value; OnPropertyChanged("Progress"); }
}
#endregion
// Command Variables
private ICommand _saveButton_Command;
public ICommand SaveButton_Command
{
get { return _saveButton_Command; }
set { _saveButton_Command = value; }
}
private ICommand _ReplaceButton_Command;
public ICommand ReplaceButton_Command
{
get { return _ReplaceButton_Command; }
set { _ReplaceButton_Command = value; }
}
private ICommand _RemoveButton_Command;
public ICommand RemoveButton_Command
{
get { return _RemoveButton_Command; }
set { _RemoveButton_Command = value; }
}
private ICommand _OpenAddWindow_Command;
public ICommand OpenAddWindow_Command
{
get { return _OpenAddWindow_Command; }
set { _OpenAddWindow_Command = value; }
}
#region Methods
public static void showMessage(string message)
{
MessageBox.Show(message);
}
public void SaveToList(object o1)
{
try
{
// Setting Flags
ErrorMessage = "";
// To Verify Validations
validateAllData();
// ProgressBar
//Progress = 0;
//ProgressBar();
// Adding a Record
ListItems.Add(new VehicleModel(VehicleNo, Model, ManufacturingDate, IUNo, PersonnelNameSelected));
// Setting Flags etc.
IsEnableReplaceButton = false;
CloseAdd();
// Clearing Form
UniqueNo = null;
VehicleNo = null;
Model = null;
ManufacturingDate = null;
IUNo = null;
PersonnelNameSelected = null;
}
catch (Exception ex)
{
Progress = 0;
ErrorMessage = ex.Message;
}
}
public void ReplaceToList(object o1)
{
try
{
VehicleModel vm = ListItems.First(x => x.UniqueNo == UniqueNo);
int indexToRemove = ListItems.IndexOf(vm);
// Setting Flags
ErrorMessage = "";
// To Verify Validations
validateAllData();
// ProgressBar
Progress = 0;
ProgressBar();
// Replacing Record
ListItems.Insert(indexToRemove + 1, vm);
ListItems.RemoveAt(indexToRemove);
// Clearing Form
VehicleNo = null;
Model = null;
ManufacturingDate = null;
IUNo = null;
PersonnelNameSelected = null;
// Setting Flags etc.
ErrorMessage = "";
IsEnableReplaceButton = false;
}
catch (Exception ex)
{
ErrorMessage = ex.Message;
}
}
public void RemoveList(object o1)
{
VehicleModel vm = ListItems.First(x => x.UniqueNo == UniqueNo);
int indexToRemove = ListItems.IndexOf(vm);
ErrorMessage = "";
try
{
// Setting Flags
ErrorMessage = "";
Progress = 0;
// Removing Selected Record
ListItems.RemoveAt(indexToRemove);
// Clearing Form
VehicleNo = null;
Model = null;
ManufacturingDate = null;
IUNo = null;
PersonnelNameSelected = null;
// Setting Flags etc.
ErrorMessage = "";
IsEnableReplaceButton = false;
}
catch (Exception ex)
{
ErrorMessage = ex.Message;
}
}
void ProgressBar()
{
BackgroundWorker worker = new BackgroundWorker();
worker.WorkerReportsProgress = true;
worker.DoWork += worker_DoWork;
worker.ProgressChanged += worker_ProgressChanged;
worker.RunWorkerAsync();
}
void worker_DoWork(object sender, DoWorkEventArgs e)
{
for (int i = 1; i <= 100; i++)
{
(sender as BackgroundWorker).ReportProgress(i);
Thread.Sleep(5);
}
}
void worker_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
Progress = e.ProgressPercentage;
}
public void validateAllData()
{
VehicleModel tempObject = new VehicleModel(VehicleNo, Model, ManufacturingDate, IUNo, PersonnelNameSelected);
}
public void validateSpecificData(int ErrorCode)
{
VehicleModel tempObject = new VehicleModel();
switch(ErrorCode)
{
case 1: tempObject.VehicleNo=VehicleNo;break;
case 2: tempObject.Model=Model;break;
case 3: tempObject.ManufacturingDate=ManufacturingDate;break;
case 4: tempObject.IUNo=IUNo;break;
}
tempObject.ValidateSpecificData(this, ErrorCode);
}
public void OpenAdd(object o1)
{
if(addVehicle==null)
{
addVehicle = new AddVehicle();
}
addVehicle.Show();
}
public void CloseAdd()
{
if (addVehicle != null)
{
addVehicle.Close();
addVehicle = null;
}
}
#endregion
#region Constructors
public VehicleMainViewModel()
{
// Initialization
//VehicleModel vm = new VehicleModel();
ListItems = new ObservableCollection<VehicleModel>();
PersonnelName = ListOfPersonnelViewModel.PersonNameList_Updating;
//PersonnelName = new ObservableCollection<string>() { "ABC", "DEF", "GHI" };
// Setting Flags
ErrorMessage = "";
IsEnableReplaceButton = false;
// Commands Initialization
SaveButton_Command = new RelayCommand(new Action<object>(SaveToList));
ReplaceButton_Command = new RelayCommand(new Action<object>(ReplaceToList));
RemoveButton_Command = new RelayCommand(new Action<object>(RemoveList));
OpenAddWindow_Command = new RelayCommand(new Action<object>(OpenAdd));
}
#endregion
}
}
可能您还没有创建单例实例，所以有可能为每个窗口创建多个实例。下面是ViewModel Singleton的示例
private static VehicleMainViewModel _Instance;
public static VehicleMainViewModel getInstance
{
get
{
if(_Instance==null)
{
_Instance = new VehicleMainViewModel();
}
return _Instance;
}
}
在生成集合的ViewModel中发布代码