IObjectDataSourceMemberFilterService.Filter(Type, IEnumerable<MemberInfo>) Method

Returns the list of type members 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<MemberInfo> Filter(
    Type dataSourceType,
    IEnumerable<MemberInfo> members
)

VB.NET

Function Filter(
    dataSourceType As Type,
    members As IEnumerable(Of MemberInfo)
) As IEnumerable(Of MemberInfo)

Parameters

Name	Type	Description
dataSourceType	Type	A type that is registered for the Report Wizard and Data Source Wizard.
members	IEnumerable<MemberInfo>	The list of type members that return IEnumerable<T> values.

Returns

Type	Description
IEnumerable<MemberInfo>	The filtered list of type members to display in the Report Wizard and Data Source Wizard.

Remarks

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

Items in the members parameter are sorted alphabetically by name. If you apply the DisplayName attribute to a member, the specified display name is used instead.

If the type’s member list is not provided, or an IObjectDataSourceMemberFilterService interface is not implemented or registered, the Report Wizard and Data Source Wizard display all members that return IEnumerable<T> values.

Members Are Not Filtered	Members With No Parameters Are Filtered Out

If a member 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 CustomObjectDataSourceMemberFilterService : IObjectDataSourceMemberFilterService {
    public IEnumerable<MemberInfo> Filter(Type dataSourceType, IEnumerable<MemberInfo> members) {
        if(dataSourceType == typeof(SampleObjectTypes.DataSource2)) {
            return members;
        }
        return members.Where(x => {
            var method = x as MethodInfo;
            if(method != null) return method.GetParameters().Length > 0;
            return false;
        });
    }
}

VB.NET

Imports System
Imports System.Collections.Generic
Imports System.Linq
Imports System.Reflection
Imports DevExpress.DataAccess.Web
' ...
Public Class CustomObjectDataSourceMemberFilterService
    Implements IObjectDataSourceMemberFilterService

    Public Function Filter(ByVal dataSourceType As Type, ByVal members As IEnumerable(Of MemberInfo)) As IEnumerable(Of MemberInfo) Implements IObjectDataSourceMemberFilterService.Filter
        If dataSourceType Is GetType(SampleObjectTypes.DataSource2) Then
            Return members
        End If
        Return members.Where(Function(x)
            Dim method = TryCast(x, MethodInfo)
            If method IsNot Nothing Then
                Return method.GetParameters().Length > 0
            End If
            Return False
        End Function)
    End Function
End Class