Type.FindMembers Method

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 nulla null reference (Nothing in Visual Basic).

• 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: array<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.

Imports System.Reflection

Class Example

    Public Shared Sub Demo(ByVal outputBlock As System.Windows.Controls.TextBlock)

        Dim obj As Object = "a string"

        ' Get the type of the object, and find all the public static or 
        ' instance methods that match the filter criteria.
        Dim members() As MemberInfo = _
            obj.GetType().FindMembers(MemberTypes.Method, _
                BindingFlags.Public Or BindingFlags.Static Or BindingFlags.Instance, _
                New MemberFilter(AddressOf PartialName), _
                "ar")

        For Each mi As MemberInfo In Members
            outputBlock.Text &= "Found: " & mi.ToString() & vbLf
        Next 

    End Sub 

    Shared Function PartialName(ByVal candidate As MemberInfo, _
                                ByVal part As Object) As Boolean
        ' Test whether the name of the candidate member contains the 
        ' specified partial name.
        If candidate.Name.IndexOf(part.ToString()) > -1 Then
            Return True
        Else
            Return False
        End If
    End Function 
End Class 

' This example produces the following output:
'
'Found: Char get_Chars(Int32)
'Found: Char[] ToCharArray()
'Found: System.String TrimStart(Char[])
'Found: Int32 Compare(System.String, System.String)
'Found: Int32 Compare(System.String, System.String, System.StringComparison)
'Found: Int32 Compare(System.String, System.String, System.Globalization.CultureInfo, System.Globalization.CompareOptions)
'Found: Int32 Compare(System.String, Int32, System.String, Int32, Int32)
'Found: Int32 Compare(System.String, Int32, System.String, Int32, Int32, System.Globalization.CultureInfo, System.Globalization.CompareOptions)
'Found: Int32 Compare(System.String, Int32, System.String, Int32, Int32, System.StringComparison)
'Found: Int32 CompareTo(System.Object)
'Found: Int32 CompareTo(System.String)
'Found: Int32 CompareOrdinal(System.String, System.String)
'Found: Int32 CompareOrdinal(System.String, Int32, System.String, Int32, Int32)
'Found: Boolean StartsWith(System.String)
'Found: Boolean StartsWith(System.String, System.StringComparison)

using System;
using System.Reflection;

class Example
{
    public static void Demo(System.Windows.Controls.TextBlock outputBlock)
    {
        Object obj = "a string";

        // Get the type of the object, and find all the public static or 
        // instance methods that match the filter criteria.
        MemberInfo[] members =
            obj.GetType().FindMembers(MemberTypes.Method, 
                BindingFlags.Public | BindingFlags.Static | BindingFlags.Instance,
                new MemberFilter(PartialName), 
                "ar");

        foreach (MemberInfo mi in members)
        {
            outputBlock.Text += "Found: " + mi.ToString() + "\n";
        }
    }

    public static bool PartialName(MemberInfo candidate, Object part)
    {
        // Test whether the name of the candidate member contains the 
        // specified partial name.
        if (candidate.Name.IndexOf(part.ToString()) > -1) 
        {
            return true;
        }
        else
        {
            return false;
        }
    }
}

/* This example produces the following output:

Found: Char get_Chars(Int32)
Found: Char[] ToCharArray()
Found: System.String TrimStart(Char[])
Found: Int32 Compare(System.String, System.String)
Found: Int32 Compare(System.String, System.String, System.StringComparison)
Found: Int32 Compare(System.String, System.String, System.Globalization.CultureInfo, System.Globalization.CompareOptions)
Found: Int32 Compare(System.String, Int32, System.String, Int32, Int32)
Found: Int32 Compare(System.String, Int32, System.String, Int32, Int32, System.Globalization.CultureInfo, System.Globalization.CompareOptions)
Found: Int32 Compare(System.String, Int32, System.String, Int32, Int32, System.StringComparison)
Found: Int32 CompareTo(System.Object)
Found: Int32 CompareTo(System.String)
Found: Int32 CompareOrdinal(System.String, System.String)
Found: Int32 CompareOrdinal(System.String, Int32, System.String, Int32, Int32)
Found: Boolean StartsWith(System.String)
Found: Boolean StartsWith(System.String, System.StringComparison)
 */