IObjectDataSourceConstructorFilterService.Filter(Type, IEnumerable<ConstructorInfo>) Method

Returns the list of type constructors to display in the Report Wizard and Data Source Wizard.

Namespace: DevExpress.DataAccess.Web

Assembly: DevExpress.DataAccess.v23.2.dll

NuGet Packages: DevExpress.DataAccess, DevExpress.Win.PivotGrid, DevExpress.Win.TreeMap

Declaration

C#

IEnumerable<ConstructorInfo> Filter(
    Type dataSourceType,
    IEnumerable<ConstructorInfo> constructors
)

VB.NET

Function Filter(
    dataSourceType As Type,
    constructors As IEnumerable(Of ConstructorInfo)
) As IEnumerable(Of ConstructorInfo)

Parameters

Name	Type	Description
dataSourceType	Type	A type that is registered for the Report Wizard and Data Source Wizard.
constructors	IEnumerable<ConstructorInfo>	The list of constructors declared in the specified type.

Returns

Type	Description
IEnumerable<ConstructorInfo>	A filtered list of constructors to display in the Report Wizard and Data Source Wizard.

Remarks

Use this method to specify which constructors the Report Wizard and Data Source Wizard should display. The list of constructors is passed in the constructors parameter. Return a filtered list of constructors.

If the type’s constructor list is not provided, or an IObjectDataSourceConstructorFilterService interface is not implemented or registered, the Report Wizard and Data Source Wizard display all constructors.

Constructors Are Not Filtered	Constructors With No Parameters Are Filtered Out

If a constructor accepts parameters, users can specify parameter values.

Specify default parameter values if needed.

The code sample below shows how to implement the Filter method.

C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using DevExpress.DataAccess.Web;
// ...
public class CustomObjectDataSourceConstructorFilterService : IObjectDataSourceConstructorFilterService {
    public IEnumerable<ConstructorInfo> Filter(Type dataSourceType, IEnumerable<ConstructorInfo> constructors) {
        if(dataSourceType == typeof(SampleObjectTypes.DataSource2)) {
            return constructors;
        }
        return constructors.Where(x => x.GetParameters().Length > 0);
    }
}

VB.NET

Imports System
Imports System.Collections.Generic
Imports System.Linq
Imports System.Reflection
Imports DevExpress.DataAccess.Web
' ...
Public Class CustomObjectDataSourceConstructorFilterService
    Implements IObjectDataSourceConstructorFilterService

    Public Function Filter(ByVal dataSourceType As Type, ByVal constructors As IEnumerable(Of ConstructorInfo)) As IEnumerable(Of ConstructorInfo) Implements IObjectDataSourceConstructorFilterService.Filter
        If dataSourceType Is GetType(SampleObjectTypes.DataSource2) Then
            Return constructors
        End If
        Return constructors.Where(Function(x) x.GetParameters().Length > 0)
    End Function
End Class