我是wpf mvvm的新手。
我需要将数据绑定到viewmodel的view属性。在模型中，我已使用getter和setter声明了所有属性并在viewmodel中声明了属性。
当我尝试绑定值时，它不会更新视图，但值会绑定到属性。控件位于网格内。控件不在网格内绑定。我点击数据网格的行时需要将数据绑定到控件。我正在获取值，但它没有被绑定到控件。
请立即帮助我。
这是我的模特。
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;}
这是我的观点模型，
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");
}
}
这是
中的绑定代码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;
}
}
这是我对视图的完整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>
答案 0 :(得分：1)
我不知道你究竟想要绑定到什么，但无论如何，我也没有看到你班上INotfyPropertyChanged interface的实现。您应该在ViewModel中实现它，如下所示：
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();
}
}
}
}
这里的绑定将是直接的
...
<ProgressBar Value="{Binding Percent}" />
...
我希望这会有所帮助。
请注意，您需要上面的.NET-Framework 4.5才能使用CallerMemberName。
答案 1 :(得分：0)
问题是您有2个EmployeeViewModel对象。一个是在XAML中创建的，并分配给DataContext和调用selectEmployeeDetails（）时创建的那个。
目前还不清楚为什么要在selectEmployeeDetails（）中创建另一个EmployeeViewModel对象，该对象可能是EmployeeViewModel的成员函数。
您是否只需在此功能中设置当前对象属性？
答案 2 :(得分：0)
顺便说一下，
public string Emp_ID;
public string emp_ID
{
get
{
return emp_ID;
}
set
{
emp_ID = value;
OnPropertyChanged("Emp_ID");
}
}
这会导致递归调用和设置，将emp_ID改为Emp_ID