WPF：將自定義數據傳遞給自定義控件和父類之間

Question

我是WPF的新手。我創建這將顯示員工數據結構如下：我已經實現INotifyPropertyChanged的我的自定義用戶控件也： 這裏的代碼片段

public class Employee : INotifyPropertyChanged 
    { 
     private int id; 
     private string name; 
     private double salary; 
     private EmployeeDesignation designation; 
     public int ID 
     { 
      get 
      { 
       return id; 
      } 
      set 
      { 
       id = value; 
       OnPropertyChanged(new PropertyChangedEventArgs("ID")); 
       //PropertyChanged(ID, new PropertyChangedEventArgs("ID")); 
      } 
     } 
... 
    public event PropertyChangedEventHandler PropertyChanged; 
     public void OnPropertyChanged(PropertyChangedEventArgs e) 
     { 
      if (PropertyChanged != null) 
      { 
       PropertyChanged(this, e); 
      } 
     } 
    } 
} 

而且用戶控件的代碼如下：

<UserControl x:Class="Assignment5.EmployeeUserControl" 
      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://scenter code herehemas.microsoft.com/expression/blend/2008" 
      mc:Ignorable="d" DataContext="{Binding RelativeSource={RelativeSource Self}, Path=.}" 
      d:DesignHeight="196" d:DesignWidth="300"> 
    <Grid Height="182"> 
     <Label Content="Name" Height="28" HorizontalAlignment="Left" Margin="26,57,0,0" Name="label1" VerticalAlignment="Top" Width="76" /> 
     <Label Content="Salary" Height="28" HorizontalAlignment="Left" Margin="26,91,0,0" Name="label2" VerticalAlignment="Top" /> 
     <Label Content="ID" Height="28" HorizontalAlignment="Left" Margin="26,23,0,0" Name="label3" VerticalAlignment="Top" /> 
     <Label Content="Designation" Height="28" HorizontalAlignment="Left" Margin="26,125,0,0" Name="label4" VerticalAlignment="Top" /> 
     <TextBox Text="{Binding ElementName=Employee, Path=ID}" Height="23" HorizontalAlignment="Left" Margin="134,28,0,0" Name="IdTextBox" VerticalAlignment="Top" Width="120" /> 
     <TextBox Text="{Binding ElementName=Employee, Path=Name}" Height="23" HorizontalAlignment="Left" Margin="134,59,0,0" Name="NameTextBox" VerticalAlignment="Top" Width="120" /> 
     <TextBox Text="{Binding ElementName=Employee, Path=Salary}" Height="23" HorizontalAlignment="Left" Margin="134,91,0,0" Name="SalaryTextBox" VerticalAlignment="Top" Width="120" LostFocus="SalaryTextBoxLostFocus" /> 
     <TextBox Text="{Binding ElementName=Employee, Path=designation}" Height="23" HorizontalAlignment="Left" Margin="134,125,0,0" Name="DesignationTextBox" VerticalAlignment="Top" Width="120" /> 
    </Grid> 
</UserControl> 

下面是隱藏文件的代碼

namespace Assignment5 
{ 
    public partial class EmployeeUserControl : UserControl, INotifyPropertyChanged 
    { 
     public static readonly DependencyProperty EmpDependancyProperty = 
          DependencyProperty.Register("Employee", typeof(Employee), typeof(EmployeeUserControl) 
          , new PropertyMetadata(
           new PropertyChangedCallback(
              EmployeeUserControl.EmployeeDataChanged))); 
     public Employee Employee 
     { 
      get 
      { 
       return (Employee)GetValue(EmpDependancyProperty); 
      } 
      set 
      { 
       SetValue(EmpDependancyProperty, value); 
      } 
     } 

     public EmployeeUserControl() 
     { 
      InitializeComponent(); 
     } 

     public event PropertyChangedEventHandler PropertyChanged; 
     protected void OnPropertyChanged(string propertyName) 
     { 
      if (PropertyChanged != null) 
      { 
       PropertyChanged(this, new PropertyChangedEventArgs(propertyName)); 
      } 
     } 

     private void SalaryTextBoxLostFocus(object sender, RoutedEventArgs e) 
     { 
      MessageBox.Show(Employee.Name); 
     } 
     private static void EmployeeDataChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) 
     { 
      EmployeeUserControl userControl = d as EmployeeUserControl; 
      userControl.OnPropertyChanged("Employee"); 
     } 
    } 
} 

這裏是我的父母控制...

<Window x:Class="Assignment5.MainWindow" 
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
     Title="MainWindow" Height="350" Width="525" xmlns:my="clr-namespace:Assignment5" 
     DataContext="{Binding RelativeSource={RelativeSource Self}, Path=.}"> 
    <Grid> 
     <my:EmployeeUserControl Employee="{Binding Path=emp, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay, NotifyOnSourceUpdated=True, NotifyOnTargetUpdated=True}" HorizontalAlignment="Left" Margin="130,56,0,0" x:Name="employeeUserControl1" VerticalAlignment="Top" Width="285" /> 
    </Grid> 
</Window> 

和後面的代碼：

namespace Assignment5 
{ 

    public partial class MainWindow : Window 
    { 
     public static readonly DependencyProperty EmpDependancyProperty = 
         DependencyProperty.Register("Employee", typeof(Employee), typeof(EmployeeUserControl) 
         , new PropertyMetadata(
          new PropertyChangedCallback(
             EmployeeUserControl.EmployeeDataChanged))); 
    public Employee Employee 
    { 
     get 
     { 
      return (Employee)GetValue(EmpDependancyProperty); 
     } 
     set 
     { 
      SetValue(EmpDependancyProperty, value); 
     } 
    } 
     public MainWindow() 
     { 
      emp = new Employee(203,"AAA",23232); 
      InitializeComponent(); 
     } 
    } 
} 

當我運行這段代碼。我開始知道父控制中的Employee對象正在初始化，但是在用戶控件中它沒有被初始化。我在這裏做錯了什麼？

Answer 1

兩個問題

1. 在你UserControl變化Bindings到

   <TextBox Text="{Binding Path=Employee.ID}" Height="23" HorizontalAlignment="Left" Margin="134,28,0,0" Name="IdTextBox" VerticalAlignment="Top" Width="120" /> 
   <TextBox Text="{Binding Employee.Name}" Height="23" HorizontalAlignment="Left" Margin="134,59,0,0" Name="NameTextBox" VerticalAlignment="Top" Width="120" /> 
   <TextBox Text="{Binding Employee.Salary}" Height="23" HorizontalAlignment="Left" Margin="134,91,0,0" Name="SalaryTextBox" VerticalAlignment="Top" Width="120" LostFocus="SalaryTextBoxLostFocus" /> 
   <TextBox Text="{Binding Employee.designation}" Height="23" HorizontalAlignment="Left" Margin="134,125,0,0" Name="DesignationTextBox" VerticalAlignment="Top" Width="120" /> 
   

2. 在窗口：

   <my:EmployeeUserControl Employee="{Binding Employee, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay, NotifyOnSourceUpdated=True, NotifyOnTargetUpdated=True}" HorizontalAlignment="Left" Margin="130,56,0,0" x:Name="employeeUserControl1" VerticalAlignment="Top" Width="285" /> 
   

   在你的構造emp = new Employee(203,"AAA",23232);沒有任何意義。 this.Employee = new Employee(203,"AAA",23232);