wpf 将数据从视图模型绑定到视图
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时间：2020-09-13 09:40:57 来源:igfitidea点击:
Binding data from viewmodel to view
提问by user2786086
I am new to wpf mvvm.
我是 wpf 的新手mvvm。
I need to bind data back to the view property from viewmodel. In the model I have declared all the properties and in the viewmodelI declared properties using getter and setter.
我需要将数据从视图模型绑定回视图属性。在模型中，我已经声明了所有属性，在viewmodel我使用 getter 和 setter 声明的属性中。
When am trying to bind the values, it is not updating the view but values get binded to the properties. The controls are inside a grid. Controls are not binding inside a grid. I need to bind data to the controls when am clicking on the row of a data grid. I am getting values but it is not get binded to the controls.
当我尝试绑定值时，它不会更新视图，而是将值绑定到属性。控件位于网格内。控件未绑定在网格内。单击数据网格的行时，我需要将数据绑定到控件。我正在获取值，但它没有绑定到控件。
Please help me immediately.
请立即帮助我。
This is my model.
这是我的模型。
public string FirstName{get;set;}
public string LastName { get; set; }
public DateTime Dob { get; set; }
public int Age { get; set; }
public string Street1 { get; set; }
public string Street2 { get; set; }
public string City { get; set; }
public string State { get; set; }
public string ZipCode { get; set; }
public string PhoneNumber { get; set; }
public string MobileNumber { get; set; }
public string Email { get; set; }
public string Web { get; set;}
This is my view model,
这是我的视图模型，
public string Emp_ID;
public string emp_ID {
get {
return emp_ID;
}
set {
emp_ID = value;
OnPropertyChanged("Emp_ID");
}
}
public string FirstName {
get {
return employee.FirstName;
}
set {
employee.FirstName = value;
OnPropertyChanged("FirstName");
this.DetailView = new HomeViewModel(value);
}
}
public string LastName {
get {
return employee.LastName;
}
set {
employee.LastName = value;
OnPropertyChanged("LastName");
}
}
public DateTime Dob {
get {
return employee.Dob;
}
set {
employee.Dob = value;
OnPropertyChanged("Dob");
OnPropertyChanged("Age");
}
}
public int Age {
get {
//Birthdate = Convert.ToDateTime(Dob);
return employee.Age = DateTime.Today.Year - Dob.Year;
}
set {
employee.Age = value;
OnPropertyChanged("Age");
}
}
public string Street1 {
get {
return employee.Street1;
}
set {
employee.Street1 = value;
OnPropertyChanged("Street1");
}
}
public string Street2 {
get {
return employee.Street2;
}
set {
employee.Street2 = value;
OnPropertyChanged("Street2");
}
}
public string City {
get {
return employee.City;
}
set {
employee.City = value;
OnPropertyChanged("City");
}
}
public string State {
get {
return employee.State;
}
set {
employee.State = value;
OnPropertyChanged("State");
}
}
public string ZipCode {
get {
return employee.ZipCode;
}
set {
employee.ZipCode = value;
OnPropertyChanged("ZipCode");
}
}
public string PhoneNumber {
get {
return employee.PhoneNumber;
}
set {
employee.PhoneNumber = value;
OnPropertyChanged("PhoneNumber");
}
}
public string MobileNumber {
get {
return employee.MobileNumber;
}
set {
employee.MobileNumber = value;
OnPropertyChanged("MobileNumber");
}
}
public string Email {
get {
return employee.Email;
}
set {
employee.Email = value;
OnPropertyChanged("Email");
}
}
public string Web {
get {
return employee.Web;
}
set {
employee.Web = value;
OnPropertyChanged("Web");
}
}
This is my binding code in the
viewmodel
这是我在
viewmodel
public ICommand SelectEmployeeCommand {
get {
return selectEmployeeCommand;
}
set {
selectEmployeeCommand = value;
}
}
private void selectEmployeeDetails() {
EmployeeViewModel employeeView = new EmployeeViewModel();
try {
sqlConnection = new SqlConnection(Connection.connectionstring);
sqlConnection.Open();
selectCommand = new SqlCommand(AppConstants.StoredProcedures.GetDataProcedure, sqlConnection);
selectCommand.CommandType = CommandType.StoredProcedure;
selectCommand.Parameters.Add(AppConstants.Parameters.Emp_ID, SqlDbType.Int).Value = SelectedEmployee.Row.ItemArray[0];
sqlAdapter = new SqlDataAdapter(selectCommand);
sqlDataSet = new DataSet();
sqlAdapter.Fill(sqlDataSet);
employeeView.FirstName = sqlDataSet.Tables[0].Rows[0][1].ToString();
employeeView.LastName = sqlDataSet.Tables[0].Rows[0][2].ToString();
employeeView.Dob = Convert.ToDateTime(sqlDataSet.Tables[0].Rows[0][3].ToString());
employeeView.Age = Convert.ToInt32(sqlDataSet.Tables[0].Rows[0][4].ToString());
employeeView.Street1 = sqlDataSet.Tables[0].Rows[0][5].ToString();
employeeView.Street2 = sqlDataSet.Tables[0].Rows[0][6].ToString();
employeeView.City = sqlDataSet.Tables[0].Rows[0][7].ToString();
employeeView.State = sqlDataSet.Tables[0].Rows[0][8].ToString();
employeeView.ZipCode = sqlDataSet.Tables[0].Rows[0][9].ToString();
employeeView.PhoneNumber = sqlDataSet.Tables[0].Rows[0][10].ToString();
employeeView.MobileNumber = sqlDataSet.Tables[0].Rows[0][11].ToString();
employeeView.Email = sqlDataSet.Tables[0].Rows[0][12].ToString();
employeeView.Web = sqlDataSet.Tables[0].Rows[0][13].ToString();
} catch (Exception ex) {
throw ex;
}
}
this is my complete xaml for the view
这是我完整的视图 xaml
<Window x:Class="EmployeeRegistration.Home" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:sdk="http://schemas.microsoft.com/winfx/2006/xaml/presentation/sdk" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:cmd="clr-namespace:GalaSoft.MvvmLight.Command;assembly=GalaSoft.MvvmLight.Extras.WPF4" xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity" xmlns:View="clr-namespace:EmployeeRegistration" Title="Home" Height="595" Width="1096">
<Window.DataContext>
<View:EmployeeViewModel></View:EmployeeViewModel>
</Window.DataContext>
<i:Interaction.Triggers>
<i:EventTrigger EventName="Loaded">
<cmd:EventToCommand Command="{Binding GetEmployeeCommand}" />
</i:EventTrigger>
</i:Interaction.Triggers>
<Window.Resources>
<Style TargetType="Control" x:Key="myErrorTemplate">
<Setter Property="Validation.ErrorTemplate"><Setter.Value><ControlTemplate><Border BorderBrush="Red" BorderThickness="1" CornerRadius="2.75" Grid.Column="0"><AdornedElementPlaceholder Name="MyControl" Grid.Column="0"/></Border></ControlTemplate></Setter.Value></Setter><Style.Triggers><Trigger Property="Validation.HasError" Value="true"><Setter Property="ToolTip" Value="{Binding RelativeSource={x:Static RelativeSource.Self},
Path=(Validation.Errors)[0].ErrorContent
}
"/>
</Trigger></Style.Triggers>
</Style>
<Style TargetType="TextBox" BasedOn="{StaticResource myErrorTemplate}" />
</Window.Resources>
<Grid Height="984" Width="1073">
<Grid.RowDefinitions>
<RowDefinition Height="65"></RowDefinition>
<RowDefinition Height="36"></RowDefinition>
<RowDefinition Height="35" />
<RowDefinition Height="44"></RowDefinition>
<RowDefinition Height="45" />
<RowDefinition Height="49" />
<RowDefinition Height="56" />
<RowDefinition Height="43" />
<RowDefinition Height="40" />
<RowDefinition Height="37"></RowDefinition>
<RowDefinition Height="39*" />
<RowDefinition Height="42*" />
<RowDefinition Height="453*" />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="538"></ColumnDefinition>
<ColumnDefinition Width="121" />
<ColumnDefinition Width="149" />
<ColumnDefinition Width="110" />
<ColumnDefinition Width="182" />
</Grid.ColumnDefinitions>
<Label Name="lblEmployeeDetails" Content="EMPLOYEE DETAILS" FontFamily="Calibri" FontSize="26" HorizontalAlignment="Center" Margin="117,12,125,6" Width="296"></Label>
<Label Name="lblHeading" Grid.Column="1" Content="UPDATE EMPLOYEE DETAILS" FontFamily="Calibri" FontSize="26" VerticalAlignment="Center" HorizontalAlignment="Center" Height="44" Width="486" Margin="49,10,27,10" Grid.ColumnSpan="4">
</Label>
<TextBlock Margin="0,-2,53,21" HorizontalAlignment="Right" Width="148" Grid.Column="3" Grid.ColumnSpan="2">
<Button Name="btnNewEmployee" Command="{Binding NewEmployeeCommand}" Content="New Employee Registration" FontFamily="Calibri" Background="#FF2693A7" Foreground="White" />
</TextBlock>
<Label Name="lblEnterName" Grid.Row="1" Content="Enter Employee Name:" FontFamily="Calibri" FontSize="16" Margin="0,8,12,21" Grid.RowSpan="2"></Label>
<TextBox Name="txtSearch" Text="{Binding Path=FirstName,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged, ValidatesOnDataErrors=True}" Grid.Row="1" Margin="174,18,0,31" HorizontalAlignment="Left" Width="186" Grid.RowSpan="2"></TextBox>
<Button Name="btnSearch" Command="{Binding SearchEmployeeCommand}" Grid.Row="1" Content="Search" Margin="0,18,61,31" HorizontalAlignment="Right" Width="103" Foreground="White" Background="Black" Grid.RowSpan="2"></Button>
<DataGrid Grid.Row="3" x:Name="grdEmployee" SelectedItem="{Binding SelectedEmployee, Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}" ItemsSource="{Binding EmployeeDatatable, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged, NotifyOnSourceUpdated=True}" AutoGenerateColumns="False" IsReadOnly="True" FontFamily="Calibri" HorizontalAlignment="Center" Margin="5,5,39,0" Width="494" CanUserAddRows="False" Background="#FF20E0BB" AlternatingRowBackground="#FF7CB4AB" Height="405" VerticalAlignment="Top" Grid.RowSpan="10">
<DataGrid.Columns>
<DataGridTextColumn Binding="{Binding Emp_id}" Header="Employee ID"></DataGridTextColumn>
<DataGridTextColumn Binding="{Binding FirstName}" Header="FirstName"></DataGridTextColumn>
<DataGridTextColumn Binding="{Binding LastName}" Header="LastName"></DataGridTextColumn>
<DataGridTextColumn Binding="{Binding Age}" Header="Age"></DataGridTextColumn>
<DataGridTextColumn Binding="{Binding ZipCode}" Header="ZipCode"></DataGridTextColumn>
<DataGridTextColumn Binding="{Binding PhoneNumber}" Header="PhoneNumber"></DataGridTextColumn>
<DataGridTextColumn Binding="{Binding MobileNumber}" Header="MobileNumber"></DataGridTextColumn>
<DataGridTemplateColumn>
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<Button Content="Edit" Command="{Binding DataContext.SelectEmployeeCommand, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type DataGrid}}}" CommandParameter="{Binding SelectedEmployee}"></Button>
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
</DataGrid.Columns>
</DataGrid>
<Label Content="*" Grid.Row="1" Height="30" HorizontalAlignment="Left" Margin="152,10,0,0" Name="lblReqField" VerticalAlignment="Top" Width="16" Foreground="Red" Grid.RowSpan="2" />
<Label Name="lblPersonalInfo" Content="PERSONAL INFO" FontFamily="Calibri" FontSize="20" Foreground="#FF1C48D8" Grid.Column="1" Grid.Row="1" Height="36" HorizontalAlignment="Left" VerticalAlignment="Top" Grid.ColumnSpan="2" Width="270" />
<Label Grid.Column="1" Grid.Row="2" Height="35" HorizontalAlignment="Left" Name="lblFirstName" Content="FirstName" FontFamily="Calibri" FontSize="16" VerticalAlignment="Top" Width="80" />
<TextBox Grid.Column="2" Grid.Row="2" Height="25" HorizontalAlignment="Left" Name="txtFirstName" Text="{Binding employee.FirstName, RelativeSource={RelativeSource FindAncestor,AncestorType={x:Type Window}},Mode=TwoWay,UpdateSourceTrigger=PropertyChanged, ValidatesOnDataErrors=True}" BorderBrush="#FF179EB7" VerticalAlignment="Top" Width="130" Margin="9,4,0,0" />
<Label Height="35" HorizontalAlignment="Left" Margin="0,9,0,0" Name="lblLastName" Content="LastName" FontFamily="Calibri" FontSize="16" VerticalAlignment="Top" Width="80" Grid.Column="1" Grid.Row="3" />
<TextBox BorderBrush="#FF179EB7" Height="25" HorizontalAlignment="Left" Name="txtLastName" Text="{Binding Path=DataContext.LastName, RelativeSource={RelativeSource FindAncestor,AncestorType={x:Type Grid}},Mode=TwoWay,UpdateSourceTrigger=PropertyChanged, ValidatesOnDataErrors=True}" VerticalAlignment="Top" Width="130" Grid.Column="2" Grid.Row="3" Margin="8,9,0,0" />
<Label Height="35" HorizontalAlignment="Left" Margin="0,10,0,0" Name="lblDob" Content="DOB" FontFamily="Calibri" FontSize="16" VerticalAlignment="Top" Width="56" Grid.Column="1" Grid.Row="4" />
<DatePicker Grid.Column="2" Grid.Row="4" Name="dtpDob" Text="{Binding DataContext.Dob, RelativeSource={RelativeSource FindAncestor,AncestorType={x:Type Grid}},Mode=TwoWay,UpdateSourceTrigger=PropertyChanged, ValidatesOnDataErrors=True}" Height="25" HorizontalAlignment="Left" Margin="9,10,0,0" VerticalAlignment="Top" Width="129" />
<Label Height="28" HorizontalAlignment="Left" Name="lblAge" Content="Age" FontFamily="Calibri" FontSize="16" VerticalAlignment="Top" Width="56" Grid.Column="1" Grid.Row="5" Margin="0,6,0,0" />
<TextBox Height="25" HorizontalAlignment="Left" Name="txtAge" BorderBrush="#FF179EB7" IsReadOnly="True" Text="{Binding DataContext.Age, RelativeSource={RelativeSource FindAncestor,AncestorType={x:Type Grid}},Mode=TwoWay,UpdateSourceTrigger=PropertyChanged, ValidatesOnDataErrors=True}" VerticalAlignment="Top" Width="129" Grid.Column="2" Grid.Row="5" Margin="9,6,0,0" />
<Label Height="35" HorizontalAlignment="Left" Margin="0,6,0,0" Name="lblAddressInfo" Content="ADDRESS INFO" FontFamily="Calibri" FontSize="20" VerticalAlignment="Top" Width="270" Grid.Column="1" Grid.Row="6" Grid.ColumnSpan="2" />
<Label Height="35" HorizontalAlignment="Left" Name="lblStreet1" Content="Street1" FontFamily="Calibri" FontSize="16" VerticalAlignment="Top" Width="56" Grid.Column="1" Grid.Row="7" />
<TextBox Name="txtStreet1" BorderBrush="#FF179EB7" Text="{Binding DataContext.Street1, RelativeSource={RelativeSource FindAncestor,AncestorType={x:Type Grid}},Mode=TwoWay,UpdateSourceTrigger=PropertyChanged, ValidatesOnDataErrors=True}" Height="25" HorizontalAlignment="Left" VerticalAlignment="Top" Width="129" Grid.Column="2" Grid.Row="7" Margin="9,8,0,0" />
<Label Height="35" HorizontalAlignment="Left" Name="lblStreet2" Content="Street2" FontFamily="Calibri" FontSize="16" VerticalAlignment="Top" Width="56" Grid.Column="1" Grid.Row="8" />
<TextBox Name="txtStreet2" BorderBrush="#FF179EB7" Text="{Binding Path=Street2, RelativeSource={RelativeSource FindAncestor,AncestorType={x:Type Grid}},Mode=TwoWay,UpdateSourceTrigger=PropertyChanged, ValidatesOnDataErrors=True}" Height="25" HorizontalAlignment="Left" Margin="9,6,0,0" VerticalAlignment="Top" Width="130" Grid.Column="2" Grid.Row="8" />
<Label Height="35" HorizontalAlignment="Left" Name="lblCity" Content="City" FontFamily="Calibri" FontSize="16" Margin="0,1,0,0" VerticalAlignment="Top" Width="56" Grid.Column="1" Grid.Row="9" />
<ComboBox Text="{Binding DataContext.City, RelativeSource={RelativeSource FindAncestor,AncestorType={x:Type Grid}},Mode=TwoWay,UpdateSourceTrigger=PropertyChanged, ValidatesOnDataErrors=True}" Name="cmbCity" Width="129" Height="25" BorderBrush="#FF179EB7" Grid.Column="2" Grid.Row="9" HorizontalAlignment="Left" Margin="9,5,0,0" VerticalAlignment="Top">
<ComboBoxItem Content="Kasargod"></ComboBoxItem>
<ComboBoxItem Content="Kannur"></ComboBoxItem>
<ComboBoxItem Content="Thrissur"></ComboBoxItem>
<ComboBoxItem Content="Ernakulam"></ComboBoxItem>
<ComboBoxItem Content="Palakkad"></ComboBoxItem>
<ComboBoxItem Content="Alappuzha"></ComboBoxItem>
<ComboBoxItem Content="Chennai"></ComboBoxItem>
<ComboBoxItem Content="WhiteField"></ComboBoxItem>
<ComboBoxItem Content="Bangalore"></ComboBoxItem>
</ComboBox>
<Label Height="35" HorizontalAlignment="Left" Name="lblState" Content="State" FontFamily="Calibri" FontSize="16" Margin="0,4,0,0" VerticalAlignment="Top" Width="56" Grid.Column="1" Grid.Row="10" />
<ComboBox Height="25" HorizontalAlignment="Left" Margin="9,6,0,0" VerticalAlignment="Top" Width="129" Grid.Column="2" Grid.Row="10" Text="{Binding Path=State, Mode=TwoWay,UpdateSourceTrigger=PropertyChanged, ValidatesOnDataErrors=True}" Name="cmbState" BorderBrush="#FF179EB7">
<ComboBoxItem Content="Kerala"></ComboBoxItem>
<ComboBoxItem Content="Karnataka"></ComboBoxItem>
<ComboBoxItem Content="TamilNadu"></ComboBoxItem>
<ComboBoxItem Content="AndhraPradesh"></ComboBoxItem>
<ComboBoxItem Content="Rajastan"></ComboBoxItem>
</ComboBox>
<Label Height="35" HorizontalAlignment="Left" Name="lblZipcode" Content="ZipCode" FontFamily="Calibri" FontSize="16" VerticalAlignment="Top" Width="65" Grid.Column="1" Grid.Row="11" Margin="3,5,0,0" />
<TextBox Name="txtZipcode" BorderBrush="#FF179EB7" Text="{Binding Path=ZipCode,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged, ValidatesOnDataErrors=True}" Height="25" HorizontalAlignment="Left" VerticalAlignment="Top" Width="130" Grid.Column="2" Grid.Row="11" Margin="9,0,0,0" />
<Label Height="35" HorizontalAlignment="Left" Name="lblContactInfo" Content="CONTACT INFO" FontFamily="Calibri" FontSize="20" VerticalAlignment="Top" Width="165" Grid.Column="3" Grid.Row="6" Grid.ColumnSpan="2" Margin="0,6,0,0" />
<Label Height="35" HorizontalAlignment="Left" Name="lblPhoneNumber" Content="PhoneNumber" FontFamily="Calibri" FontSize="16" VerticalAlignment="Top" Width="110" Grid.Column="3" Grid.Row="7" />
<TextBox Height="25" Name="txtPhoneNo" BorderBrush="#FF179EB7" Text="{Binding Path=PhoneNumber,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged, ValidatesOnDataErrors=True}" HorizontalAlignment="Left" Margin="1,0,0,0" VerticalAlignment="Top" Width="129" Grid.Column="4" Grid.Row="7" />
<Label Height="35" HorizontalAlignment="Left" Name="lblMobileNumber" Content="MobileNumber" FontFamily="Calibri" FontSize="16" VerticalAlignment="Top" Width="109" Grid.Column="3" Grid.Row="8" Margin="1,2,0,0" Grid.RowSpan="2" />
<TextBox Name="txtMobileNo" BorderBrush="#FF179EB7" Text="{Binding Path=MobileNumber,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged, ValidatesOnDataErrors=True}" Height="25" HorizontalAlignment="Left" Margin="1,4,0,0" VerticalAlignment="Top" Width="129" Grid.Column="4" Grid.Row="8" />
<Label Height="35" HorizontalAlignment="Left" Name="lblEmail" Content="Email" FontFamily="Calibri" FontSize="16" VerticalAlignment="Top" Width="56" Grid.Column="3" Grid.Row="9" Margin="0,1,0,0" />
<TextBox Name="txtEmail" BorderBrush="#FF179EB7" Text="{Binding Path=Email,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged, ValidatesOnDataErrors=True}" Height="25" HorizontalAlignment="Left" Margin="0,5,0,0" VerticalAlignment="Top" Width="129" Grid.Column="4" Grid.Row="9" />
<Label Height="35" HorizontalAlignment="Left" Name="lblWeb" Content="Web" FontFamily="Calibri" FontSize="16" VerticalAlignment="Top" Width="56" Grid.Column="3" Grid.Row="10" Margin="1,4,0,0" />
<TextBox Name="txtWeb" BorderBrush="#FF179EB7" Text="{Binding Path=Web,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged, ValidatesOnDataErrors=True}" Height="25" HorizontalAlignment="Left" Margin="1,4,0,0" VerticalAlignment="Top" Width="129" Grid.Column="4" Grid.Row="10" />
</Grid>
</Window>
回答by MoonKnight
I don't see what exactly you are attempting to bind to, but reguardless, I also don't see an implementation of the INotfyPropertyChangedinterfaceon your class. You should implement this in your ViewModel like so:
我不知道你到底想绑定什么，但是毫无防备，我也没有看到你的类上的INotfyPropertyChanged接口实现。你应该像这样在你的 ViewModel 中实现它：
public class SomeClass : INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
// This method is called by the Set accessor of each property.
// The CallerMemberName attribute that is applied to the optional propertyName
// parameter causes the property name of the caller to be substituted as an argument.
private void NotifyPropertyChanged([CallerMemberName] String propertyName = "")
{
if (PropertyChanged != null)
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
private int percent = 0;
public int Percent
{
get { return percent; }
set
{
if (value != percent)
{
percent = value;
NotifyPropertyChanged();
}
}
}
}
The binding here would then be straight forward
此处的绑定将是直接的
...
<ProgressBar Value="{Binding Percent}" />
...
I hope this helps.
我希望这有帮助。
Note that you need .NET-Framework 4.5 our above to use CallerMemberName.
请注意，您需要上面的 .NET-Framework 4.5 才能使用CallerMemberName.
回答by grantnz
The problem is that you have 2 EmployeeViewModel objects. The one is created in the XAML and assigned to the DataContext and the one created when selectEmployeeDetails() is called.
问题是您有 2 个 EmployeeViewModel 对象。一个是在 XAML 中创建并分配给 DataContext 的，另一个是在调用 selectEmployeeDetails() 时创建的。
It's unclear as to why you are creating another EmployeeViewModel object within selectEmployeeDetails() which presumably is a member function of EmployeeViewModel.
不清楚为什么要在 selectEmployeeDetails() 中创建另一个 EmployeeViewModel 对象，该对象大概是 EmployeeViewModel 的成员函数。
Should you just set the current objects properties within this function?
你应该在这个函数中设置当前对象的属性吗？
回答by Maximus
By the way,
顺便一提，
public string Emp_ID;
public string emp_ID
{
get
{
return emp_ID;
}
set
{
emp_ID = value;
OnPropertyChanged("Emp_ID");
}
}
this will cause recursive calling and setting, alter emp_ID to Emp_ID
这将导致递归调用和设置，将 emp_ID 更改为 Emp_ID
