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में व्यूमोडेल के साथ सूची बॉक्स बाध्यकारी मैं WPF के लिए नया हूं और एमवीवीएम फ्रेमवर्क का उपयोग करके नमूना अनुप्रयोग बनाने की कोशिश कर रहा हूं। मेरे एप्लिकेशन में एक xaml फ़ाइल है जिसमें ग्राहक जानकारी इनपुट करने के लिए कुछ टेक्स्टबॉक्स हैं, राज्यों के प्रदर्शन के लिए कॉम्बो बॉक्स और एक सेव बटन। सभी डेटाबेसिंग ViewModel (CustomerViewMode) के माध्यम से किया जाता है जिसमें मॉडल (ग्राहक) का संदर्भ होता है, जिसमें आवश्यक फ़ील्ड और उनके गेटर, सेटर्स शामिल होते हैं। व्यू मॉडेल में ग्राहक सूची संपत्ति है। सहेजें बटन पर क्लिक करने पर, मैं एक सूची बॉक्स में ग्राहक के फर्स्टनाम और अंतिम नाम गुण प्रदर्शित करना चाहता हूं। यह वह जगह है जहां समस्या है। मैंने कोड डीबग किया, (पीछे कोड में बटन की घटना पर क्लिक करें), मैं देख सकता हूं कि ग्राहक सूची में इसके सभी विवरणों के साथ पहली ग्राहक वस्तु है, लेकिन यह सूची बॉक्स में प्रदर्शित नहीं हो रहा है। मेरा कोड है: ग्राहक (मॉडल);WPF
enter code here
namespace SampleMVVM.Models
{
class Customer : INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
private String _firstName;
private String _lastName;
private Address _customerAddress;
public String FirstName
{
get { return _firstName; }
set
{
if (value != _firstName)
{
_firstName = value;
RaisePropertyChanged("FirstName");
}
}
}
public String LastName
{
get { return _lastName; }
set
{
if (value != _lastName)
{
_lastName = value;
RaisePropertyChanged("LastName");
}
}
}
public Address CustomerAddress
{
get { return _customerAddress; }
set
{
if (value != _customerAddress)
{
_customerAddress = value;
RaisePropertyChanged("CustomerAddress");
}
}
}
private void RaisePropertyChanged(string propertyName)
{
var handler = PropertyChanged;
if (handler != null)
{
handler(this, new PropertyChangedEventArgs(propertyName));
}
}
}
}
पता (मॉडल)
namespace SampleMVVM.Models
{
class Address : INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
private string _addressLine1;
private string _addressLine2;
private string _city;
//private string _selectedState;
private string _postalCode;
private string _country;
public String AddressLine1
{
get { return _addressLine1; }
set
{
if (value != _addressLine1)
{
_addressLine1 = value;
RaisePropertyChanged(AddressLine1);
}
}
}
public String AddressLine2
{
get { return _addressLine2; }
set
{
if (value != _addressLine2)
{
_addressLine2 = value;
RaisePropertyChanged(AddressLine2);
}
}
}
public String City
{
get { return _city; }
set
{
if (value != _city)
{
_city = value;
RaisePropertyChanged(City);
}
}
}
public String PostalCode
{
get { return _postalCode; }
set
{
if (value != _postalCode)
{
_postalCode = value;
RaisePropertyChanged(PostalCode);
}
}
}
public String Country
{
get { return _country; }
set
{
if (value != _country)
{
_country = value;
RaisePropertyChanged(Country);
}
}
}
private void RaisePropertyChanged(string propertyName)
{
var handler = PropertyChanged;
if (handler != null)
{
handler(this, new PropertyChangedEventArgs(propertyName));
}
}
}
}
CustomerViewModel:
namespace SampleMVVM.ViewModels
{
class CustomerViewModel : INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
private Customer _customer;
RelayCommand _saveCommand;
private List<String> _stateList = new List<string>();
private string _selectedState;
private ObservableCollection<Customer> _customerList = new ObservableCollection<Customer>();
//public CustomerViewModel(ObservableCollection<Customer> customers)
//{
// _customers = new ListCollectionView(customers);
//}
public Customer CustomerModel
{
get { return _customer; }
set
{
if (value != _customer)
{
_customer = value;
RaisePropertyChanged("CustomerModel");
}
}
}
public List<String> StateList
{
get
{
return _stateList;
}
set { _stateList = value; }
}
public ObservableCollection<Customer> CustomerList
{
get
{
return _customerList;
}
set
{
if (value != _customerList)
{
_customerList = value;
RaisePropertyChanged("CustomerList");
}
}
}
public CustomerViewModel()
{
CustomerModel = new Customer
{
FirstName = "Fred",
LastName = "Anders",
CustomerAddress = new Address
{
AddressLine1 = "Northeastern University",
AddressLine2 = "360, Huntington Avenue",
City = "Boston",
PostalCode = "02115",
Country = "US",
}
};
StateList = new List<String>
{
"Alaska", "Arizona", "California", "Connecticut", "Massachusetts", "New Jersey", "Pennsylvania", "Texas"
};
SelectedState = StateList.FirstOrDefault();
}
public String SelectedState
{
get { return _selectedState; }
set
{
if (value != _selectedState)
{
_selectedState = value;
RaisePropertyChanged(SelectedState);
}
}
}
private void RaisePropertyChanged(string propertyName)
{
var handler = PropertyChanged;
if (handler != null)
{
handler(this, new PropertyChangedEventArgs(propertyName));
}
}
}
}
01,235,CustomerInfo.xaml (दृश्य)
<UserControl x:Class="SampleMVVM.Views.CustomerInfo"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:ViewModels="clr-namespace:SampleMVVM.ViewModels"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="300">
<UserControl.DataContext>
<ViewModels:CustomerViewModel />
</UserControl.DataContext>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition />
<ColumnDefinition />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition />
<RowDefinition />
<RowDefinition />
<RowDefinition />
<RowDefinition />
<RowDefinition />
<RowDefinition />
<RowDefinition />
<RowDefinition />
<RowDefinition />
</Grid.RowDefinitions>
<!--Starting label-->
<TextBlock FontSize="18" FontFamily="Comic Sans MS" FontWeight="ExtraBlack"
Foreground="Navy"
Grid.Row="0" HorizontalAlignment="Center">
<TextBlock.Text>
Customer Information:
</TextBlock.Text>
</TextBlock>
<TextBlock Text="First name: " Grid.RowSpan="2" HorizontalAlignment="Left" VerticalAlignment="Top"
Grid.Row="1" Width="80px" Height="50px" Margin="40,5,0,0"/>
<TextBox Text="{Binding CustomerModel.FirstName}" Grid.RowSpan="2" HorizontalAlignment="Left"
VerticalAlignment="Top"
Grid.Row="1" Grid.Column="1" Width="80px" Height="20px" Margin="20,5,0,0" Name="fname"/>
<TextBlock Text="Last Name: " Grid.RowSpan="2" HorizontalAlignment="Left" VerticalAlignment="Top"
Grid.Row="2" Width="80px" Height="50px" Margin="40,5,0,0"/>
<TextBox Text="{Binding CustomerModel.LastName}" Grid.RowSpan="2" HorizontalAlignment="Left"
VerticalAlignment="Top"
Grid.Row="2" Grid.Column="1" Width="80px" Height="20px" Margin="20,5,0,0" Name="lname"/>
<TextBlock Text="Address: " Grid.RowSpan="2" HorizontalAlignment="Left" VerticalAlignment="Top"
Grid.Row="3" Width="80px" Height="50px" Margin="40,5,0,0"/>
<TextBox Text="{Binding CustomerModel.CustomerAddress.AddressLine1}" Grid.RowSpan="2" HorizontalAlignment="Left"
VerticalAlignment="Top"
Grid.Row="3" Grid.Column="1" Width="160px" Height="20px" Margin="20,5,0,0"/>
<TextBox Text="{Binding CustomerModel.CustomerAddress.AddressLine2}" Grid.RowSpan="2" HorizontalAlignment="Left"
VerticalAlignment="Top"
Grid.Row="4" Grid.Column="1" Width="160px" Height="30px" Margin="20,5,0,0"/>
<TextBlock Text="City: " Grid.RowSpan="2" HorizontalAlignment="Left" VerticalAlignment="Top"
Grid.Row="5" Width="80px" Height="20px" Margin="40,5,0,0"/>
<TextBox Text="{Binding CustomerModel.CustomerAddress.City}" Grid.RowSpan="2" HorizontalAlignment="Left"
VerticalAlignment="Top"
Grid.Row="5" Grid.Column="1" Width="80px" Height="20px" Margin="20,5,0,0"/>
<TextBlock Text="State: " Grid.RowSpan="2" HorizontalAlignment="Left" VerticalAlignment="Top"
Grid.Row="6" Width="80px" Height="20px" Margin="40,5,0,0"/>
<ComboBox Grid.RowSpan="2" HorizontalAlignment="Left" Name="listOfSates"
VerticalAlignment="Top"
Grid.Row="6" Grid.Column="1" Width="80px" Height="20px" Margin="20,5,0,0"
ItemsSource="{Binding Path=StateList}"
SelectedItem="{Binding Path=SelectedState}"
SelectionChanged="ComboBox_SelectionChanged"
>
</ComboBox>
<TextBlock Text="PostalCode: " Grid.RowSpan="2" HorizontalAlignment="Left" VerticalAlignment="Top"
Grid.Row="7" Width="80px" Height="20px" Margin="40,5,0,0"/>
<TextBox Text="{Binding CustomerModel.CustomerAddress.PostalCode}" Grid.RowSpan="2" HorizontalAlignment="Left"
VerticalAlignment="Top"
Grid.Row="7" Grid.Column="1" Width="80px" Height="20px" Margin="20,5,0,0"/>
<TextBlock Text="Country: " Grid.RowSpan="2" HorizontalAlignment="Left" VerticalAlignment="Top"
Grid.Row="8" Width="80px" Height="20px" Margin="40,5,0,0"/>
<TextBox Text="{Binding CustomerModel.CustomerAddress.Country}" Grid.RowSpan="2" HorizontalAlignment="Left"
VerticalAlignment="Top"
Grid.Row="8" Grid.Column="1" Width="80px" Height="20px" Margin="20,5,0,0"/>
<Button Content="Save" Grid.RowSpan="2" HorizontalAlignment="Left" VerticalAlignment="Top"
Grid.Row="9" Width="50px" Height="20px" Name="savebtn" Margin="40,5,0,0"
Click="savebtn_Click"/>
<ListBox Name="cList" ItemsSource="{Binding Path=CustomerList}"
HorizontalAlignment="Left"
VerticalAlignment="Top"
Grid.Row="1" Grid.Column="2" Grid.RowSpan="2" Width="200px" Height="300px" Margin="200,5,0,0">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel>
<TextBlock Text="{Binding CustomerModel.FirstName}"
FontWeight="Bold" Foreground="Navy"/>
<TextBlock Text=", " />
<TextBlock Text="{Binding CustomerModel.LastName}"
FontWeight="Bold" Foreground="Navy"/>
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
</Grid>
CustomerInfo (कोड वर्ग के पीछे)
namespace SampleMVVM.Views
{
/// <summary>
/// Interaction logic for CustomerInfo.xaml
/// </summary>
public partial class CustomerInfo : UserControl
{
public CustomerInfo()
{
InitializeComponent();
//checkvalue();
}
private void savebtn_Click(object sender, RoutedEventArgs e)
{
////Customer c = new Customer();
////c.FirstName = fname.Text;
////c.LastName = lname.Text;
//CustomerViewModel cvm = new CustomerViewModel();
//cvm.CustomerModel.FirstName = fname.Text;
//cvm.CustomerModel.LastName = lname.Text;
//List<CustomerViewModel> customerList = new List<CustomerViewModel>();
//customerList.Add(cvm);
var viewModel = DataContext as CustomerViewModel;
if (viewModel != null)
{
//viewModel.ShowCustomerInfo();
String strfname = viewModel.CustomerModel.FirstName;
String strname = viewModel.CustomerModel.LastName;
viewModel.CustomerList.Add(viewModel.CustomerModel);
String str1 = viewModel.CustomerList.FirstOrDefault().FirstName;
int i = viewModel.CustomerList.Count();
//cList.ItemsSource = viewModel.CustomerList;
}
}
private void ComboBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
CustomerViewModel cvm = new CustomerViewModel();
cvm.SelectedState = listOfSates.SelectedItem.ToString();
}
}
}
मैं बस नहीं कर सकते समझ में जहाँ मैं गलत हो रहा हूँ ... किसी को मदद कृपया
आपको बहुत धन्यवाद:) ... मैंने सूची बॉक्स के अंदर बाइंडिंग बदल दी और यह काम किया :) – user1318369