[英]XAML Binding Observable Collection to DataGrid
我在基於其他屬性進行數據綁定時遇到麻煩。 我的組合框工作正常,但數據網格卻沒有。 我正在嘗試使用DataContext="{Binding RelativeSource={RelativeSource Self}}"
將窗口綁定到背后的代碼,這樣我可以設計Intellisense,但是我使用x:Name:"_Window"
HRRM的模型有很多實體,而且我知道我嘗試綁定的屬性也拼寫正確等。但是我不知道為什么DataGrid不會顯示雇員。 我還確保將數據放置在可觀察的集合中,並且嘗試將項目源僅綁定到ListEmployees和SmsEmployees,而我嘗試過的任何方法都沒有起作用。 這是我嘗試過的最后一部分代碼。
<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=">>" Margin="10,85,10,0" VerticalAlignment="Top" Grid.Column="1"
Click="cmdMoveAllHired_Click" />
<Button x:Name="cmdReturnSingleItem" Content=">" Margin="10,122,10,0" VerticalAlignment="Top"
Grid.Column="1" Click="cmdReturnSingleItem_Click" />
<Button x:Name="cmdMoveAllReturned" Content="<<" Margin="10,196,10,0" VerticalAlignment="Top"
Grid.Column="1" Click="cmdMoveAllReturned_Click" />
<Button x:Name="cmdHireSingleItem" Content="<" 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));
}
}
我不相信您的ListEmployees
ItemsSource
將更新DataGrid
因為它不是DependencyProperty
或您尚未實現INotifyPropertyChanged
。 它沒有更新,因為您正在為屬性分配一個新實例。
而是嘗試將其添加到您的構造函數中:
ListEmployees = new ObservableCollection<HRRM>();
這是您的ChangeCompany方法:
foreach (var employee in Facade.GetEmployeePhoneNumbers(Companies.ToList(), false).OrderBy(x => x.SortName))
{
ListEmployees.Add(employee);
}
上面的內容實際上將使用ObservableCollection
,然后應更新UI。
我認為您的問題是如何分配Window的DataContext。 在XAML中,添加對命名空間的引用,以便Window可以找到您的SendSms視圖模型,然后在XAML中(請參見下文)或在Window的代碼后面分配DataContext屬性。 如果以這種方式設置DataContext,則在綁定到SendSms視圖模型時不需要使用RelativeSource,但是如果要查看更改,則還需要確保可觀察性集合的類填充有INotifyPropertyChanged實現。
<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>
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