XAML绑定可观察集合到DataGrid

Question

我遇到了基于其他属性的数据绑定问题。我的combobox工作正常，但datagrids不是。我试图窗口结合使用 DataContext="{Binding RelativeSource={RelativeSource Self}}"，所以我可以有时间设计的智能感知代码隐藏，但我把它用x:Name:"_Window"

为HRRM模型有很多实体类的了，我知道的是，属性我想要绑定太拼写正确等，但我不明白为什么DataGrid不会显示员工。我也确保数据被放置在可观察的集合中，并且我已经尝试将项源绑定到ListEmployees和SmsEmployees，并且我没有尝试过任何工作。这是我试过的最后一段代码。

<Window x:Class="GUI.Employees.Misc.SendSms" 
    x:Name="_Window" 
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
    Title="Send SMS" Height="525" Width="1000" DataContext="{Binding ElementName=_Window}"> 

<Grid> 

    <Grid.ColumnDefinitions> 
     <ColumnDefinition Width="270*" /> 
     <ColumnDefinition Width="150" /> 
     <ColumnDefinition Width="270*" /> 
    </Grid.ColumnDefinitions> 
    <ComboBox Grid.Column="0" x:Name="cmbCompany" DisplayMemberPath="Name" ItemsSource="{Binding Path=Companies, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=Window}}" Margin="10,10,10,0" VerticalAlignment="Top" SelectionChanged="cmbCompany_SelectionChanged"/> 
    <DataGrid Grid.Column="0" x:Name="dgEmployees" Margin="10,37,10,10" IsReadOnly="True" AutoGenerateColumns="False" ItemsSource="{Binding Path=ListEmployees, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=Window} }"> 
     <DataGrid.Columns> 
      <DataGridTextColumn Header="Company" Binding="{Binding HRCo }"/> 
      <DataGridTextColumn Header="First Name" Binding="{Binding FirstName}" /> 
      <DataGridTextColumn Header="Last Name" Binding="{Binding LastName}"/> 
      <DataGridTextColumn Header="Craft" Binding="{Binding StdCraft}"/> 
     </DataGrid.Columns> 
    </DataGrid> 
    <DataGrid x:Name="dgSendSms" Margin="10,37,10,10" IsReadOnly="True" Grid.Column="2" ItemsSource="{Binding SmsEmployees, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=Window} }"> 
     <DataGrid.Columns> 
      <DataGridTextColumn Header="Company" Binding="{Binding HRCo}"/> 
      <DataGridTextColumn Header="First Name" Binding="{Binding FirstName}" /> 
      <DataGridTextColumn Header="Last Name" Binding="{Binding LastName}"/> 
      <DataGridTextColumn Header="Craft" Binding="{Binding StdCraft}"/> 
     </DataGrid.Columns> 
    </DataGrid> 
    <Button x:Name="cmdMoveAllHired" Content="&gt;&gt;" Margin="10,85,10,0" VerticalAlignment="Top" Grid.Column="1" 
      Click="cmdMoveAllHired_Click" /> 
    <Button x:Name="cmdReturnSingleItem" Content="&gt;" Margin="10,122,10,0" VerticalAlignment="Top" 
      Grid.Column="1" Click="cmdReturnSingleItem_Click" /> 
    <Button x:Name="cmdMoveAllReturned" Content="&lt;&lt;" Margin="10,196,10,0" VerticalAlignment="Top" 
      Grid.Column="1" Click="cmdMoveAllReturned_Click" /> 
    <Button x:Name="cmdHireSingleItem" Content="&lt;" Margin="10,159,10,0" VerticalAlignment="Top" Grid.Column="1" 
      Click="cmdHireSingleItem_Click" /> 
    <Button x:Name="cmdGenerate" Content="Generate" Grid.Column="1" Margin="10,0,10,10" 
      VerticalAlignment="Bottom" Click="cmdGenerate_Click" Visibility="Collapsed" /> 
    <Button x:Name="cmdBack" Content="Back" Grid.Column="1" HorizontalAlignment="Left" Margin="10,249,0,0" 
      VerticalAlignment="Top" Width="130" Click="cmdBack_Click" /> 

    <Button x:Name="cmdSendSMS" Content="Send SMS" Grid.Column="1" HorizontalAlignment="Left" Margin="10,316,0,0" VerticalAlignment="Top" Width="130" Click="cmdSendSMS_Click"/> 

</Grid> 

namespace GUI.Employees.Misc 
{ 
public partial class SendSms 
{ 
    public ObservableCollection<HQCO> Companies { get; set; } 

    public ObservableCollection<HRRM> ListEmployees { get; set; } 

    private ObservableCollection<HRRM> _smsEmployees; 

    public ObservableCollection<HRRM> SmsEmployees { 
     get { return _smsEmployees; } 
     set { _smsEmployees = value; 
     } 
    } 

    public SendSms() 
    { 
     InitializeComponent(); 
     Companies = new ObservableCollection<HQCO>(HQCO.GetActivePRCompanies()); 
     Companies.Insert(0, new HQCO { HQCo = 0, Name = "All" }); 
     // cmbCompany.SelectedItem = _companies.Single(x=>x.HQCo == 0); 
     SmsEmployees = new ObservableCollection<HRRM>(); 
     ChangeCompany(); 
    } 
    private void ChangeCompany() 
    { 
     if (((HQCO)cmbCompany.SelectedItem)?.HQCo == 0) 
      foreach (var co in Companies) 
       co.IsChecked = true; 
     else 
      foreach (var co in Companies) 
       if (((HQCO)cmbCompany.SelectedItem) == co) 
        co.IsChecked = true; 
       else 
        co.IsChecked = false; 

     ListEmployees = new ObservableCollection<HRRM>(Facade.GetEmployeePhoneNumbers(Companies.ToList(), false).OrderBy(x => x.SortName)); 
    } 
} 

Answer 1

我认为你的问题是你如何分配你的窗口的DataContext。在您的XAML中，添加对命名空间的引用，以便Window可以找到您的SendSms viewmodel，然后在XAML中分配DataContext属性（请参见下文），或者在Window的代码隐藏中。如果以这种方式设置DataContext，则在绑定到SendSms视图模型时不需要使用RelativeSource，但如果要查看更改，还需要确保可观察集合的类使用实现INotifyPropertyChanged进行填充。

<Window x:Name="_Window" 
     xmlns:local="clr-namespace:GUI.Employees.Misc" > 

<!-- set the DataContext of this Window to an instance of SendSms --> 
<Window.DataContext> 
    <local:SendSms /> 
</Window.DataContext> 

<DataGrid ItemsSource="{Binding ListEmployees}"> 
    ... 
</DataGrid> 

Answer 2

我不相信你的ListEmployeesItemsSource将更新DataGrid，因为它不是一个DependencyProperty或者你还没有实现INotifyPropertyChanged。它不会更新，因为您正在为该属性分配一个新实例。

而是尝试添加这对你的构造：

ListEmployees = new ObservableCollection<HRRM>(); 

这对您的ChangeCompany方法：

foreach (var employee in Facade.GetEmployeePhoneNumbers(Companies.ToList(), false).OrderBy(x => x.SortName)) 
{ 
    ListEmployees.Add(employee); 
} 

以上，实际上利用ObservableCollection，然后它应该更新UI。