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Type.FindMembers Method

Updated: September 2009

Returns a filtered array of MemberInfo objects of the specified member type.

Namespace:  System
Assembly:  mscorlib (in mscorlib.dll)
public virtual MemberInfo[] FindMembers(
	MemberTypes memberType,
	BindingFlags bindingAttr,
	MemberFilter filter,
	Object filterCriteria
)

Parameters

memberType
Type: System.Reflection.MemberTypes

A MemberTypes object indicating the type of member to search for.

bindingAttr
Type: System.Reflection.BindingFlags

A bitmask comprised of one or more BindingFlags that specify how the search is conducted.

-or-

Zero, to return null.

filter
Type: System.Reflection.MemberFilter

The delegate that does the comparisons, returning true if the member currently being inspected matches the filterCriteria and false otherwise. You can use the FilterAttribute, FilterName, and FilterNameIgnoreCase delegates supplied by this class. The first uses the fields of FieldAttributes, MethodAttributes, and MethodImplAttributes as search criteria, and the other two delegates use String objects as the search criteria.

filterCriteria
Type: System.Object

The search criteria that determines whether a member is returned in the array of MemberInfo objects.

The fields of FieldAttributes, MethodAttributes, and MethodImplAttributes can be used in conjunction with the FilterAttribute delegate supplied by this class.

Return Value

Type: System.Reflection.MemberInfo[]
A filtered array of MemberInfo objects of the specified member type.
-or-
An empty array of type MemberInfo, if the current Type does not have members of type memberType that match the filter criteria.

Implements

_Type.FindMembers(MemberTypes, BindingFlags, MemberFilter, Object)
ExceptionCondition
ArgumentNullException

filter is null.

This method can be overridden by a derived class.

The following BindingFlags filter flags can be used to define which members to include in the search:

  • You must specify either BindingFlags.Instance or BindingFlags.Static in order to get a return.

  • Specify BindingFlags.Instance to include instance members in the search.

  • Specify BindingFlags.Static to include static members in the search.

  • Specify BindingFlags.Public to include public members in the search.

  • Specify BindingFlags.NonPublic to include non-public members (that is, private and protected members) in the search.

The following BindingFlags modifier flags can be used to change how the search works:

  • BindingFlags.DeclaredOnly to search only the members declared on the Type, not members that were simply inherited.

See System.Reflection.BindingFlags for more information.

Valid values for MemberType are defined in MemberInfo. If no such members are found, an empty array is returned.

To get the class initializer (.cctor) using this method, you must specify BindingFlags.Static | BindingFlags.NonPublic (BindingFlags.Static Or BindingFlags.NonPublic in Visual Basic). You can also get the class initializer using the TypeInitializer property.

If the current Type represents a type parameter of a generic type or generic method, FindMembers processes any members declared by the class constraint and the interface constraints of the type parameter.

The following example finds all the members in a class that match the specified search criteria, and then displays the matched members.

using System;
using System.Reflection;

class MyFindMembersClass
{
    public static void Main()
    {
        Object objTest = new Object();
        Type objType = objTest.GetType ();
        MemberInfo[] arrayMemberInfo;
        try
        {
            //Find all static or public methods in the Object class that match the specified name.
            arrayMemberInfo = objType.FindMembers(MemberTypes.Method,
                BindingFlags.Public | BindingFlags.Static| BindingFlags.Instance,
                new MemberFilter(DelegateToSearchCriteria),
                "ReferenceEquals");

            for(int index=0;index < arrayMemberInfo.Length ;index++)
                Console.WriteLine ("Result of FindMembers -\t"+ arrayMemberInfo[index].ToString() +"\n");                 
        }
        catch (Exception e)
        {
            Console.WriteLine ("Exception : " + e.ToString() );            
        }           
    }
    public static bool DelegateToSearchCriteria(MemberInfo objMemberInfo, Object objSearch)
    {
        // Compare the name of the member function with the filter criteria. 
        if(objMemberInfo.Name.ToString() == objSearch.ToString())
            return true;
        else  
            return false;
    }
}

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

Date

History

Reason

September 2009

Removed an erroneous statement that null is returned for non-public members outside the assembly, if caller lacks ReflectionPermission.

Content bug fix.

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