如何以编程方式更新自动生成的datagrid组合框单元格中的项目源 [英] How to update programmatically the items source in an autogenerated datagrid combobox cell
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问题描述
我找不到我的问题的解决方案
我有一个绑定到对象集合的datagrid。我的对象属性之一用作集合中的索引。自动生成的组合框列类型显示与此索引相关联的标签。
我需要更新另一个属性，该属性也是同一对象中的索引。我使用此代码在AutogeneratingColumn事件中添加组合框：
public partial class LedTableEditor：MetroWindow，INotifyPropertyChanged
{
私有对象_sender;
public Dictionary< int，string> IdColors = new Dictionary< int，string>（）;
public ObservableCollection< Xceed.Wpf.Toolkit.ColorItem> MarshallingColors = new ObservableCollection< Xceed.Wpf.Toolkit.ColorItem>（）;
私人字典< int，string> cbTypeVals = new Dictionary< int，string>（）;
私人字典< UInt16，string> cbSrcValueVals = new Dictionary< UInt16，string>（）;
私人字典< UInt16，string> cbDiagVals = new Dictionary< UInt16，string>（）;
私人列表< string> ListeData = new List< string>（）;
私人列表< string> ListeDiag = new List< string>（）;
private int maxLeds = 16;
私人XapLedVals带领;
public LedTableEditor（object senderParam）
{
-----
}
私人void DgLedTable_AutoGeneratingColumn（object sender，DataGridAutoGeneratingColumnEventArgs e）
{
if（e.PropertyName ==Type）
{
DataGridComboBoxColumn cbType = new DataGridComboBoxColumn（）;
cbType.EditingElementStyle = new Style（typeof（ComboBox））
{
Setters =
{
new EventSetter（Selector.SelectionChangedEvent，new SelectionChangedEventHandler（OnComboBoxSelectionChanged））
}
};
e.Column = cbType;
cbType.ItemsSource = cbTypeVals; // new List< string> {eLedType.ALERTE.ToString（），eLedType.DIAG.ToString（），eLedType.TRIGGER.ToString（）};
cbType.DisplayMemberPath =Value;
cbType.SelectedValuePath =Key;
cbType.SelectedValueBinding = new Binding（Type）;
e.Column.Header =Type;
e.Column.CellStyle = new Style（typeof（DataGridCell））;
e.Column.CellStyle.Setters.Add（新的Setter（DataGridCell.HorizontalAlignmentProperty，HorizontalAlignment.Stretch））;
}
if（e.PropertyName ==Binding）
{
DataGridComboBoxColumn cbBinding = new DataGridComboBoxColumn（）;
BindingOperations.SetBinding（cbBinding，DataGridComboBoxColumn.ItemsSourceProperty，new Binding（Source）{Source = this}）;
e.Column = cbBinding;
cbBinding.ItemsSource = cbSrcValueVals;
cbBinding.DisplayMemberPath =Value;
cbBinding.SelectedValuePath =Key;
cbBinding.SelectedValueBinding = new Binding（Binding）;
e.Column.Header =Binding;
e.Column.CellStyle = new Style（typeof（DataGridCell））;
e.Column.CellStyle.Setters.Add（新的Setter（DataGridCell.HorizontalAlignmentProperty，HorizontalAlignment.Stretch））;
}
----
}
组合框类型项目来源是字典：
私人字典< int，string> cbTypeVals = new Dictionary< int，string>（）;
我需要更新此绑定组合框项目源，它在同一个datagrid中也是自动生成的：
if（e.PropertyName ==Binding）
{
AutoCommitComboBoxColumn cb = new AutoCommitComboBoxColumn ）;
e.Column = cb;
cb.ItemsSource = cbSrcValueVals;
cb.DisplayMemberPath =Value;
cb.SelectedValuePath =Key;
cb.SelectedValueBinding = new Binding（Binding）;
e.Column.Header =Binding;
e.Column.CellStyle = new Style（typeof（DataGridCell））;
e.Column.CellStyle.Setters.Add（新的Setter（DataGridCell.HorizontalAlignmentProperty，HorizontalAlignment.Stretch））;
}
comboboxBinding项目源是一个字典：
私人字典< UInt16，string> cbSrcValueVals = new Dictionary< UInt16，string>（）;
应该使用这个更新：
私人字典< UInt16，string> cbDiagVals = new Dictionary< UInt16，string>（）;
事件正确触发，但我找不到更新绑定组合框项目的方法
private void OnComboBoxSelectionChanged（object sender，SelectionChangedEventArgs e）
{
DgLedTable.CurrentCell = new DataGridCellInfo （DgLedTable.SelectedIndex，DgLedTable.Columns [1]）;
}
感谢您的帮助。
此处编辑的是具有ComboBoxType项目的屏幕图像：
编辑，添加的财产已更改：
private System.Collections。 IEnumerable _source;
public System.Collections.IEnumerable Source
{
get {return _source; }
set {_source = value; OnPropertyChanged（）; }
}
public event PropertyChangedEventHandler PropertyChanged;
private void OnPropertyChanged（[CallerMemberName] string propertyName = null）
{
PropertyChanged？.Invoke（this，new PropertyChangedEventArgs（propertyName））;
}
private void OnComboBoxSelectionChanged（object sender，SelectionChangedEventArgs e）
{
// DgLedTable.CurrentCell = new DataGridCellInfo（DgLedTable.SelectedIndex，DgLedTable.Columns [1 ]）;
源= cbDiagVals;
}
解决方案
如果您创建源属性并将Binding ComboBox 的 ItemsSource 属性绑定到该属性中，您可以将此属性设置为新集合Type ComboBox的 SelectionChanged 事件处理程序。
窗口 - 或者您的代码定义的任何类型 - 必须实现 INotifyPropertyChanged 这个工作接口：
public partial class MainWindow：Window， INotifyPropertyChanged
{
私人字典< int，string> cbTypeVals = new Dictionary< int，string>（）;
私人字典< UInt16，string> cbSrcValueVals = new Dictionary< UInt16，string>（）;
私有字典< UInt16，string> cbDiagVals = new Dictionary< UInt16，string>（）;
public MainWindow（）
{
InitializeComponent（）;
_source = cbTypeVals;
// ...
}
private System.Collections.IEnumerable _source;
public System.Collections.IEnumerable Source
{
get {return _source; }
set {_source = value; OnPropertyChanged（）;
}
private void OnAutoGeneratingColumn（object sender，DataGridAutoGeneratingColumnEventArgs e）
{
if（e.PropertyName ==Binding）
{
AutoCommitComboBoxColumn cb = new AutoCommitComboBoxColumn（）;
e.Column = cb;
//将ItemsSource属性绑定到窗口的Source属性...
cb.SetBinding（AutoCommitComboBoxColumn.ItemsSourceProperty，new Binding（Source）{Source = this}） ;
cb.ItemsSource = cbSrcValueVals;
cb.DisplayMemberPath =Value;
cb.SelectedValuePath =Key;
cb.SelectedValueBinding = new Binding（Binding）;
e.Column.Header =Binding;
e.Column.CellStyle = new Style（typeof（DataGridCell））;
e.Column.CellStyle.Setters.Add（新的Setter（DataGridCell.HorizontalAlignmentProperty，HorizontalAlignment.Stretch））;
}
// ...
}
private void OnComboBoxSelectionChanged（object sender，SelectionChangedEventArgs e）
{
//设置将Source属性的值添加到新集合，并在此处引发PropertyChanged事件...
Source = cbDiagVals;
}
public event PropertyChangedEventHandler PropertyChanged;
private virtual void OnPropertyChanged（[CallerMemberName] string propertyName = null）
{
PropertyChanged？.Invoke（this，new PropertyChangedEventArgs（propertyName））;
}
// ...
}
I can't find a working solution to my issue
I have a datagrid binded to an object collection. one of my object property is used as an index in a collection. The autogenerated combobox column "Type" displays the "label" associated to this index.
I need to update another property which is an index too in that same object. I use this code to add the combobox in the AutogeneratingColumn event :
public partial class LedTableEditor : MetroWindow, INotifyPropertyChanged
{
private object _sender;
public Dictionary<int, string> IdColors = new Dictionary<int, string>();
public ObservableCollection<Xceed.Wpf.Toolkit.ColorItem> MarshallingColors = new ObservableCollection<Xceed.Wpf.Toolkit.ColorItem>();
private Dictionary<int, string> cbTypeVals = new Dictionary<int, string>();
private Dictionary<UInt16, string> cbSrcValueVals = new Dictionary<UInt16, string>();
private Dictionary<UInt16, string> cbDiagVals = new Dictionary<UInt16, string>();
private List<string> ListeData = new List<string>();
private List<string> ListeDiag = new List<string>();
private int maxLeds = 16;
private XapLedVals led;
public LedTableEditor(object senderParam)
{
-----
}
private void DgLedTable_AutoGeneratingColumn(object sender, DataGridAutoGeneratingColumnEventArgs e)
{
if (e.PropertyName == "Type")
{
DataGridComboBoxColumn cbType = new DataGridComboBoxColumn();
cbType.EditingElementStyle = new Style(typeof(ComboBox))
{
Setters =
{
new EventSetter(Selector.SelectionChangedEvent, new SelectionChangedEventHandler(OnComboBoxSelectionChanged))
}
};
e.Column = cbType;
cbType.ItemsSource = cbTypeVals; // new List<string> { eLedType.ALERTE.ToString(), eLedType.DIAG.ToString(), eLedType.TRIGGER.ToString() };
cbType.DisplayMemberPath = "Value";
cbType.SelectedValuePath = "Key";
cbType.SelectedValueBinding = new Binding("Type");
e.Column.Header = "Type";
e.Column.CellStyle = new Style(typeof(DataGridCell));
e.Column.CellStyle.Setters.Add(new Setter(DataGridCell.HorizontalAlignmentProperty, HorizontalAlignment.Stretch));
}
if (e.PropertyName == "Binding")
{
DataGridComboBoxColumn cbBinding = new DataGridComboBoxColumn();
BindingOperations.SetBinding(cbBinding, DataGridComboBoxColumn.ItemsSourceProperty, new Binding("Source") { Source = this });
e.Column = cbBinding;
cbBinding.ItemsSource = cbSrcValueVals;
cbBinding.DisplayMemberPath = "Value";
cbBinding.SelectedValuePath = "Key";
cbBinding.SelectedValueBinding = new Binding("Binding");
e.Column.Header = "Binding";
e.Column.CellStyle = new Style(typeof(DataGridCell));
e.Column.CellStyle.Setters.Add(new Setter(DataGridCell.HorizontalAlignmentProperty, HorizontalAlignment.Stretch));
}
----
}
the combobox "Type" item source is a dictionary :
private Dictionary<int, string> cbTypeVals = new Dictionary<int, string>();
I need to update this "Binding" combobox item source, which is autogenerated too in the same datagrid :
if (e.PropertyName == "Binding")
{
AutoCommitComboBoxColumn cb = new AutoCommitComboBoxColumn();
e.Column = cb;
cb.ItemsSource = cbSrcValueVals;
cb.DisplayMemberPath = "Value";
cb.SelectedValuePath = "Key";
cb.SelectedValueBinding = new Binding("Binding");
e.Column.Header = "Binding";
e.Column.CellStyle = new Style(typeof(DataGridCell));
e.Column.CellStyle.Setters.Add(new Setter(DataGridCell.HorizontalAlignmentProperty, HorizontalAlignment.Stretch));
}
the combobox "Binding" item source is a dictionary :
private Dictionary<UInt16, string> cbSrcValueVals = new Dictionary<UInt16, string>();
it should be updated with this one :
private Dictionary<UInt16, string> cbDiagVals = new Dictionary<UInt16, string>();
The event is correctly fired, but I can't find a way to update "Binding" combobox items.
private void OnComboBoxSelectionChanged(object sender, SelectionChangedEventArgs e)
{
DgLedTable.CurrentCell = new DataGridCellInfo(DgLedTable.SelectedIndex, DgLedTable.Columns[1]);
}
Thank you for your help.
Edit here is an image of the screen with items in ComboBox "Type" :
Edit, code added for property changed :
private System.Collections.IEnumerable _source;
public System.Collections.IEnumerable Source
{
get { return _source; }
set { _source = value; OnPropertyChanged(); }
}
public event PropertyChangedEventHandler PropertyChanged;
private void OnPropertyChanged([CallerMemberName] string propertyName = null)
{
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
private void OnComboBoxSelectionChanged(object sender, SelectionChangedEventArgs e)
{
// DgLedTable.CurrentCell = new DataGridCellInfo(DgLedTable.SelectedIndex, DgLedTable.Columns[1]);
Source = cbDiagVals;
}
解决方案
If you create a source property and bind the ItemsSource property of the "Binding" ComboBox to this one you could set this property to a new collection in the "Type" ComboBox's SelectionChanged event handler.
The window - or in whatever type your code is defined - must implement the INotifyPropertyChanged interface for this to work:
public partial class MainWindow : Window, INotifyPropertyChanged
{
private Dictionary<int, string> cbTypeVals = new Dictionary<int, string>();
private Dictionary<UInt16, string> cbSrcValueVals = new Dictionary<UInt16, string>();
private Dictionary<UInt16, string> cbDiagVals = new Dictionary<UInt16, string>();
public MainWindow()
{
InitializeComponent();
_source = cbTypeVals;
//...
}
private System.Collections.IEnumerable _source;
public System.Collections.IEnumerable Source
{
get { return _source; }
set { _source = value; OnPropertyChanged(); }
}
private void OnAutoGeneratingColumn(object sender, DataGridAutoGeneratingColumnEventArgs e)
{
if (e.PropertyName == "Binding")
{
AutoCommitComboBoxColumn cb = new AutoCommitComboBoxColumn();
e.Column = cb;
//bind the ItemsSource property to the Source property of the window here...
cb.SetBinding(AutoCommitComboBoxColumn.ItemsSourceProperty, new Binding("Source") { Source = this });
cb.ItemsSource = cbSrcValueVals;
cb.DisplayMemberPath = "Value";
cb.SelectedValuePath = "Key";
cb.SelectedValueBinding = new Binding("Binding");
e.Column.Header = "Binding";
e.Column.CellStyle = new Style(typeof(DataGridCell));
e.Column.CellStyle.Setters.Add(new Setter(DataGridCell.HorizontalAlignmentProperty, HorizontalAlignment.Stretch));
}
//...
}
private void OnComboBoxSelectionChanged(object sender, SelectionChangedEventArgs e)
{
//set the value of the Source property to a new collection and raise the PropertyChanged event here...
Source = cbDiagVals;
}
public event PropertyChangedEventHandler PropertyChanged;
private virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
{
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
//...
}
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