如何在更新方法后清除文本框

Question

我有3個文本框，一個復選框，listview和3個按鈕。 現在，thextbox和一個復選框綁定到ManageUsersViewModel中的屬性“User”。 ListView將其選定項綁定到屬性“SelectedUser”。 按鈕被命名為“添加”，“編輯”，“保存”。 每個按鈕都綁定到它自己的命令。 “添加”按鈕的命令工作正常。 當我點擊它時，我從WCF服務調用一個方法，該方法將新用戶插入數據庫。 當我在列表視圖中選擇一行時，單擊“編輯”按鈕復選框，文本框中填充了我選擇的值。 現在我可以通過單擊“保存”按鈕來更改值並保存更改。 問題是，我無法在此過程后再次添加新用戶。 當我嘗試添加新用戶時，我輸入文本框的值也會更改我之前更改的值。 Bassicly我無法再次執行添加功能，更新功能后直到我重新啟動窗口。 此外，我想要我的文本框，並在添加或更新功能后清除復選框。 這是我的代碼：

ManageUsersViewModel

class ManageUsersViewModel : ViewModelBase
{
   #region Constructor

    private ServiceReference1.tblUser user;
    public ServiceReference1.tblUser User    
    {
        get
        {
            return user;
        }
        set
        {
            user = value;
            OnPropertyChanged("User");
        }
    }

    private ServiceReference1.tblUser selectedUser;
    public ServiceReference1.tblUser SelectedUser
    {
        get
        {
            return selectedUser;
        }
        set
        {
            selectedUser = value;
            OnPropertyChanged("SelectedUser");
        }
    }


    private ObservableCollection<ServiceReference1.tblUser> users;
    public ObservableCollection<ServiceReference1.tblUser> Users     // Property "Service"
    {
        get
        {
            return users;
        }
        set
        {
            users = value;
            OnPropertyChanged("Users");
        }
    }

    public ManageUsersViewModel()
    {
    }   // Konstruktor

    #endregion

    public ICommand _addUser;
    public ICommand addUser 
    {
        get
        {
            if (_addUser == null)
            {
                _addUser = new DelegateCommand(delegate()
                {
                    try
                    {                            
                        Service1Client wcf = new Service1Client();
                        wcf.AddUser(User);
                        Users.Add(User);
                        wcf.Close();
                    }
                    catch
                    {
                        Trace.WriteLine("working...", "MyApp");
                    }
                });
            }

            return _addUser;
        }
    }

 public ICommand _btnEditUser;
    public ICommand btnEditUser
    {
        get
        {
            if (_btnEditUser == null)
            {
                _btnEditUser = new DelegateCommand(delegate()
                {
                    try
                    {
                        User = SelectedUser;

                    }
                    catch
                    {
                        Trace.WriteLine("working...", "MyApp");
                    }
                });
            }

            return _btnEditUser;
        }
    }

    public ICommand _btnUpdateUser;
    public ICommand btnUpdateUser
    {
        get
        {
            if (_btnUpdateUser == null)
            {
                _btnUpdateUser = new DelegateCommand(delegate()
                {
                    try
                    {
                        Service1Client wcf = new Service1Client();
                        wcf.updateUser(SelectedUser);
                        wcf.Close();                           


                    }
                    catch
                    {
                        Trace.WriteLine("working...", "MyApp");
                    }
                });
            }

            return _btnUpdateUser;
        }
    }
}

ManageUsers.xaml

<TextBox Height="25" HorizontalAlignment="Left" Margin="124,12,0,0" Name="txtName" VerticalAlignment="Top" Width="156" BorderBrush="#89000000" FontFamily="Times New Roman" FontSize="14" TabIndex="0" Text="{Binding Path=User.Name}" />
    <TextBox Height="25" HorizontalAlignment="Left" Margin="124,43,0,0" Name="txtNewUsername" VerticalAlignment="Top" Width="156" BorderBrush="#89000000" FontFamily="Times New Roman" FontSize="14" TabIndex="1" Text="{Binding Path=User.Username}" />
    <TextBox Height="25" HorizontalAlignment="Left" Margin="124,74,0,0" Name="txtPassword" VerticalAlignment="Top" Width="156" BorderBrush="#89000000" FontFamily="Times New Roman" FontSize="14" TabIndex="2" Text="{Binding Path=User.Password}" />
    <Button Content="Dodaj" Height="23" HorizontalAlignment="Left" Margin="286,12,0,0" Name="btnAddUser" VerticalAlignment="Top" Width="73" BorderBrush="Black" FontFamily="Times New Roman" FontWeight="Bold" FontSize="15" IsDefault="True" Command="{Binding addUser}" />
    <Button Content="Izmeni" Height="23" HorizontalAlignment="Left" Margin="381,152,0,0" Name="btnEditUser" VerticalAlignment="Top" Width="73" BorderBrush="Black" FontFamily="Times New Roman" FontWeight="Bold" FontSize="15" Command="{Binding btnEditUser}" />
    <Button BorderBrush="Black" Content="Sačuvaj" FontFamily="Times New Roman" FontSize="15" FontWeight="Bold" Height="23" HorizontalAlignment="Left" IsDefault="True" Margin="361,12,0,0" Name="btnUpdateUser" VerticalAlignment="Top" Width="73" Visibility="Visible" Command="{Binding btnUpdateUser}"/>
    <CheckBox Content="Administrator" Height="16" HorizontalAlignment="Left" Margin="124,110,0,0" Name="checkBox1" VerticalAlignment="Top" BorderBrush="#89000000" FontFamily="Times New Roman" FontWeight="Bold" FontSize="14" TabIndex="3" IsChecked="{Binding User.IsAdmin}" />
    <ListView SelectionMode="Single" Height="204" HorizontalAlignment="Left" Margin="7,152,0,0" Name="lvUsers" VerticalAlignment="Top" Width="368" FontFamily="Times New Roman" FontSize="14" ItemsSource="{Binding Path=Users}" FontWeight="Bold" Foreground="Black" BorderBrush="Black" SelectedItem="{Binding Path=SelectedUser}">

Answer 1

更改adduser命令以將用戶設置為新用戶：

這應該清除字段並允許創建新用戶。

public ICommand addUser 
{
    get
    {
        if (_addUser == null)
        {
            _addUser = new DelegateCommand(delegate()
            {
                try
                {                            
                    Service1Client wcf = new Service1Client();
                    wcf.AddUser(User);
                    Users.Add(User);
                    wcf.Close();
                    this.User = new User();
                }
                catch
                {
                    Trace.WriteLine("working...", "MyApp");
                }
            });
        }

        return _addUser;
    }
}

Answer 2

完成添加和更新過程后，將User和SelectedUser屬性設置為新實例。 例如，如果User是ClSUser類的對象

User=new ClSUser();

所以對於SelectedUser。