DataGrid.Columns Propiedad

Definición

Espacio de nombres:

System.Windows.Controls

Ensamblado:

PresentationFramework.dll

Obtiene una colección que contiene todas las columnas de DataGrid.

public:
 property System::Collections::ObjectModel::ObservableCollection<System::Windows::Controls::DataGridColumn ^> ^ Columns { System::Collections::ObjectModel::ObservableCollection<System::Windows::Controls::DataGridColumn ^> ^ get(); };

public System.Collections.ObjectModel.ObservableCollection<System.Windows.Controls.DataGridColumn> Columns { get; }

member this.Columns : System.Collections.ObjectModel.ObservableCollection<System.Windows.Controls.DataGridColumn>

Public ReadOnly Property Columns As ObservableCollection(Of DataGridColumn)

Valor de propiedad

ObservableCollection<DataGridColumn>

Colección de columnas del objeto DataGrid.

Ejemplos

En el ejemplo siguiente se muestra cómo agregar una columna a la colección.

<!-- ItemsSource is a DataTable that contains a list of customers.  The DataTable columns are  
     Title, FirstName, MiddleName, LastName, Suffix, CompanyName, EmailAddress, and Phone.-->
<DataGrid Grid.Row="2" Name="DG2" ItemsSource="{Binding}" AutoGenerateColumns="False" />

public Window1()
{

Public Sub New()

    //Create a new column to add to the DataGrid
    DataGridTextColumn textcol = new DataGridTextColumn();
    //Create a Binding object to define the path to the DataGrid.ItemsSource property
    //The column inherits its DataContext from the DataGrid, so you don't set the source
    Binding b = new Binding("LastName");
    //Set the properties on the new column
    textcol.Binding = b;
    textcol.Header = "Last Name";
    //Add the column to the DataGrid
    DG2.Columns.Add(textcol);
}

    'Create a new column to add to the DataGrid
    Dim textcol As New DataGridTextColumn()
    'Create a Binding object to define the path to the DataGrid.ItemsSource property 
    'The column inherits its DataContext from the DataGrid, so you don't set the source
    Dim b As New Binding("LastName")
    'Set the properties on the new column
    textcol.Binding = b
    textcol.Header = "Last Name"
    'Add the column to the DataGrid

    DG2.Columns.Add(textcol)
End Sub

En el ejemplo siguiente se muestra cómo quitar una columna de la colección.

<Button Content="Delete First Column" Click="Button_Click" />

<!-- ItemsSource is a DataTable that contains a list of customers.  The DataTable columns are  
     Title, FirstName, MiddleName, LastName, Suffix, CompanyName, EmailAddress, and Phone.-->
<DataGrid Grid.Row="1" Name="DG1" ItemsSource="{Binding}" AutoGeneratingColumn="DG1_AutoGeneratingColumn"  />

private void Button_Click(object sender, RoutedEventArgs e)
{
    //Delete the first column whether visible or not
    DG1.Columns.RemoveAt(0);
}

Private Sub Button_Click(ByVal sender As Object, ByVal e As RoutedEventArgs)
    'Delete the first column whether visible or not
    DG1.Columns.RemoveAt(0)
End Sub

En el ejemplo siguiente se muestra cómo establecer propiedades en columnas de la colección cuando se generan automáticamente y cuándo se produce un evento.

<CheckBox Content="View Customer Details" Checked="CheckBox_Checked" Unchecked="CheckBox_Unchecked" />

<!-- ItemsSource is a DataTable that contains a list of customers.  The DataTable columns are  
     Title, FirstName, MiddleName, LastName, Suffix, CompanyName, EmailAddress, and Phone.-->
<DataGrid Grid.Row="1" Name="DG1" ItemsSource="{Binding}" AutoGeneratingColumn="DG1_AutoGeneratingColumn"  />

private void DG1_AutoGeneratingColumn(object sender, DataGridAutoGeneratingColumnEventArgs e)
{
    //Set properties on the columns during auto-generation
    switch (e.Column.Header.ToString())
    {
        case "LastName":
            e.Column.CanUserSort = false;
            e.Column.Visibility = Visibility.Visible;
            break;
        case "FirstName":
            e.Column.Visibility = Visibility.Visible;
            break;
        case "CompanyName":
            e.Column.Visibility = Visibility.Visible;
            break;
        case "EmailAddress":
            e.Column.Visibility = Visibility.Visible;
            break;
        default:
            e.Column.Visibility = Visibility.Collapsed;
            break;
    }
}

private void CheckBox_Checked(object sender, RoutedEventArgs e)
{
    //Make each column in the collection visible
    foreach (DataGridColumn col in DG1.Columns)
    {
        col.Visibility = Visibility.Visible;
    }
}

private void CheckBox_Unchecked(object sender, RoutedEventArgs e)
{
    //Get the columns collection
    ObservableCollection<DataGridColumn> columns = DG1.Columns;

    //set the visibility for each column so only 4 columns are visible
    foreach (DataGridColumn col in columns)
    {
        switch (col.Header.ToString())
        {
            case "LastName":
                col.Visibility = Visibility.Visible;
                break;
            case "FirstName":
                col.Visibility = Visibility.Visible;
                break;
            case "CompanyName":
                col.Visibility = Visibility.Visible;
                break;
            case "EmailAddress":
                col.Visibility = Visibility.Visible;
                break;
            default:
                col.Visibility = Visibility.Collapsed;
                break;
        }
    }
}

Private Sub DG1_AutoGeneratingColumn(ByVal sender As Object, ByVal e As DataGridAutoGeneratingColumnEventArgs)
    'Set properties on the columns during auto-generation
    Select Case e.Column.Header.ToString()
        Case "LastName"
            e.Column.CanUserSort = False
            e.Column.Visibility = Visibility.Visible
            Exit Select
        Case "FirstName"
            e.Column.Visibility = Visibility.Visible
            Exit Select
        Case "CompanyName"
            e.Column.Visibility = Visibility.Visible
            Exit Select
        Case "EmailAddress"
            e.Column.Visibility = Visibility.Visible
            Exit Select
        Case Else
            e.Column.Visibility = Visibility.Collapsed
            Exit Select

    End Select
End Sub

Private Sub CheckBox_Checked(ByVal sender As Object, ByVal e As RoutedEventArgs)
    'Make each column in the collection visible
    For Each col As DataGridColumn In DG1.Columns
        col.Visibility = Visibility.Visible
    Next
End Sub

Private Sub CheckBox_Unchecked(ByVal sender As Object, ByVal e As RoutedEventArgs)
    'Get the columns collection
    Dim columns As ObservableCollection(Of DataGridColumn) = DG1.Columns

    'set the visibility for each column so only 4 columns are visible
    For Each col As DataGridColumn In columns
        Select Case col.Header.ToString()
            Case "LastName"
                col.Visibility = Visibility.Visible
                Exit Select
            Case "FirstName"
                col.Visibility = Visibility.Visible
                Exit Select
            Case "CompanyName"
                col.Visibility = Visibility.Visible
                Exit Select
            Case "EmailAddress"
                col.Visibility = Visibility.Visible
                Exit Select
            Case Else
                col.Visibility = Visibility.Collapsed
                Exit Select
        End Select

    Next
End Sub

Comentarios

Use la Columns colección para agregar columnas, quitar columnas o actualizar propiedades en las columnas.

Nota

El orden de las columnas de la colección no determina el orden en que aparecerán en .DataGrid La DisplayIndex propiedad determina el orden de columna.

Cada columna de la Columns colección define una columna en .DataGrid En la tabla siguiente se enumeran los cuatro tipos de columna que DataGrid proporciona .

Tipo de columna	Presentación de datos
DataGridHyperlinkColumn	Use para mostrar datos de URI.
DataGridComboBoxColumn	Use para mostrar los datos de enumeración.
DataGridTextColumn	Use para mostrar texto.
DataGridCheckBoxColumn	Use para mostrar datos booleanos.

Además, puede definir su propia columna personalizada mediante DataGridTemplateColumn. Las columnas de la colección deben derivarse de DataGridColumn. Tenga en cuenta que DataGridBoundColumn, que agrega compatibilidad con el enlace, deriva de DataGridColumn y es la base de varios de los tipos de columna definidos.

Todas las columnas de la colección usan la ItemsSource propiedad definida por DataGrid.

Puede modificar la Columns colección en tiempo de ejecución independientemente de si contiene columnas generadas.