DataGrid.Columns Properti

Definisi

Ruang nama:

System.Windows.Controls

Rakitan:

PresentationFramework.dll

Mendapatkan koleksi yang berisi semua kolom di 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)

Nilai Properti

ObservableCollection<DataGridColumn>

Kumpulan kolom di DataGrid.

Contoh

Contoh berikut menunjukkan cara menambahkan kolom ke koleksi.

<!-- 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

Contoh berikut menunjukkan cara menghapus kolom dari koleksi.

<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

Contoh berikut menunjukkan cara mengatur properti pada kolom dalam koleksi saat dibuat secara otomatis dan kapan peristiwa terjadi.

<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

Keterangan

Columns Gunakan koleksi untuk menambahkan kolom, menghapus kolom, atau memperbarui properti pada kolom.

Nota

Urutan kolom dalam koleksi tidak menentukan urutan bahwa kolom akan muncul di DataGrid. Properti DisplayIndex menentukan urutan kolom.

Setiap kolom dalam Columns koleksi menentukan kolom di DataGrid. Tabel berikut ini mencantumkan empat tipe kolom yang DataGrid disediakan.

Tipe Kolom	Tampilan Data
DataGridHyperlinkColumn	Gunakan untuk menampilkan data URI.
DataGridComboBoxColumn	Gunakan untuk menampilkan data enumerasi.
DataGridTextColumn	Gunakan untuk menampilkan teks.
DataGridCheckBoxColumn	Gunakan untuk menampilkan data Boolean.

Selain itu, Anda dapat menentukan kolom kustom Anda sendiri dengan menggunakan DataGridTemplateColumn. Kolom dalam koleksi harus berasal dari DataGridColumn. Perhatikan bahwa DataGridBoundColumn, yang menambahkan dukungan untuk pengikatan, berasal dari DataGridColumn dan merupakan dasar untuk beberapa jenis kolom yang ditentukan.

Semua kolom dalam koleksi menggunakan properti yang ItemsSource ditentukan oleh DataGrid.

Anda dapat mengubah koleksi pada Columns waktu proses terlepas dari apakah koleksi tersebut berisi kolom yang dihasilkan.