GroupInfo Class

Represents an object, which contains information about a group.

Namespace: DevExpress.Xpf.Printing

Assembly: DevExpress.Xpf.Printing.v18.2.dll

Declaration

C#

public class GroupInfo

VB.NET

Public Class GroupInfo

Remarks

Objects of the GroupInfo class are stored in the GroupInfoCollection, which is returned by the CollectionViewLink.GroupInfos property of the CollectionViewLink instance.

Example

The following example demonstrates how to use the CollectionViewLink class to print data from a hierarchical datasource, which implements the ICollectionView interface.

For this, it is necessary to do the following:

• Assign an object, which implements the ICollectionView interface to the CollectionViewLink.CollectionView property;
• Create a DataTemplate for a single detail row and assign it to the CollectionViewLink.DetailTemplate property;
• Create a DataTemplate for a group header and assign it to the GroupInfo.HeaderTemplate property;
• Call the LinkBase.CreateDocument method to generate report pages.

Note

A complete sample project is available at https://github.com/DevExpress-Examples/how-to-use-the-collectionview-link-e1674.

Window1.xaml.cs

using System;
using System.ComponentModel;
using System.Globalization;
using System.Windows;
using System.Windows.Data;
using DevExpress.Xpf.Printing;
// ...
private void button1_Click(object sender, RoutedEventArgs e) {
    // Create a link and bind it to the PrintPreview instance.
    CollectionViewLink link = new CollectionViewLink();
    //preview.Model = new LinkPreviewModel(link);

    // Create an ICollectionView object.
    link.CollectionView = CreateMonthCollectionView();

    // Provide export templates.
    link.DetailTemplate = (DataTemplate)Resources["monthNameTemplate"];
    link.GroupInfos.Add(new GroupInfo((DataTemplate)Resources["monthQuarterTemplate"]));

    // Create a document.
    link.CreateDocument(true);

    // Show a Print Preview.
    PrintHelper.ShowPrintPreviewDialog(this, link);
}


private ICollectionView CreateMonthCollectionView() {
    const int monthCount = 12;
    string[] monthNames = CultureInfo.CurrentCulture.DateTimeFormat.MonthNames;

    MonthItem[] data = new MonthItem[Math.Min(monthNames.Length, monthCount)];
    for (int i = 0; i < data.Length; i++) {
        data[i] = new MonthItem(monthNames[i], (i / 3) + 1);
    }

    CollectionViewSource source = new CollectionViewSource();
    source.Source = data;
    source.GroupDescriptions.Add(new PropertyGroupDescription("Quarter"));

    return source.View;
}

public class MonthItem {
    public string Name { get; private set; }
    public int Quarter { get; private set; }

    public MonthItem(string name, int quarter) {
        Name = name;
        Quarter = quarter;
    }
}

Window1.xaml

<Window.Resources>
    <DataTemplate x:Key="monthNameTemplate">
        <dxe:TextEdit Text="{Binding Path=Content.Name, Mode=OneWay}" />
    </DataTemplate>
    <DataTemplate x:Key="monthQuarterTemplate">
        <dxe:TextEdit Text="{Binding Path=Content.Name, Mode=OneWay}" FontWeight="Bold" />
    </DataTemplate>
</Window.Resources>

Window1.xaml.vb

Imports System
Imports System.ComponentModel
Imports System.Globalization
Imports System.Windows
Imports System.Windows.Data
Imports DevExpress.Xpf.Printing
' ...
Private Sub button1_Click(ByVal sender As Object, ByVal e As RoutedEventArgs)
    ' Create a link and bind it to the PrintPreview instance.
    Dim link As New CollectionViewLink()
    'preview.Model = new LinkPreviewModel(link);

    ' Create an ICollectionView object.
    link.CollectionView = CreateMonthCollectionView()

    ' Provide export templates.
    link.DetailTemplate = DirectCast(Resources("monthNameTemplate"), DataTemplate)
    link.GroupInfos.Add(New GroupInfo(DirectCast(Resources("monthQuarterTemplate"), DataTemplate)))

    ' Create a document.
    link.CreateDocument(True)

    ' Show a Print Preview.
    PrintHelper.ShowPrintPreviewDialog(Me, link)
End Sub


Private Function CreateMonthCollectionView() As ICollectionView
    Const monthCount As Integer = 12
    Dim monthNames() As String = CultureInfo.CurrentCulture.DateTimeFormat.MonthNames

    Dim data(Math.Min(monthNames.Length, monthCount) - 1) As MonthItem
    For i As Integer = 0 To data.Length - 1
        data(i) = New MonthItem(monthNames(i), (i \ 3) + 1)
    Next i

    Dim source As New CollectionViewSource()
    source.Source = data
    source.GroupDescriptions.Add(New PropertyGroupDescription("Quarter"))

    Return source.View
End Function

Public Class MonthItem
    Private privateName As String
    Public Property Name() As String
        Get
            Return privateName
        End Get
        Private Set(ByVal value As String)
            privateName = value
        End Set
    End Property
    Private privateQuarter As Integer
    Public Property Quarter() As Integer
        Get
            Return privateQuarter
        End Get
        Private Set(ByVal value As Integer)
            privateQuarter = value
        End Set
    End Property

    Public Sub New(ByVal name As String, ByVal quarter As Integer)
        Me.Name = name
        Me.Quarter = quarter
    End Sub
End Class

Inheritance

Object

GroupInfo