Type.FindMembers Method Explained

Syntax

public virtual MemberInfo[] FindMembers
(
     MemberTypes memberType,
     BindingFlags bindingAttr,
     MemberFilter filter,
     Object filterCriteria
)
MemberTypes enum: type of members to be included such as Constructor, Field, Method;

BindingFlags enum (FlagAttributes=bitwise combination): Flags to define the scope of members to be   included. Must specify Instance or Static along with Public or NonPublic or no members will be returned.
MemberFilter delegate: Used to filter qualified members based on the filterCriteria.

public delegate bool MemberFilter
(
     MemberInfo m,
     Object filterCriteria
)

Each qualified member (passed as MemberInfo) is compared to filterCriteria and included in the output if the comparison returns true.
The filter can be obtained from: Type.FilterAttribute, Type.FilterName, Type.FilterNameIgnorCase.
TheFilterAttribute uses the fields of FieldAttributes, MethodAttributes, and MethodImplAttributes as search criteria, and the other two delegates use String objects as the search criteria
Object filterCriteria: Passed into MemberFilter as filterCriteria. Its value depends on the type of filter used as described above. This parameter is more powful when used with FilterName and FilterNameIgnorCase since it can take the wild card form like "*" or "fun*".

Example
public class c1
{
     private int privateF1;
     public static int publicF1=2;
     public void method1(){ }
     private void method12(){ }
     private void method2(){ }
}
MemberInfo[] mi =
typeof(c1).FindMembers(MemberTypes.Field, BindingFlags.Public |

BindingFlags.Static, Type.FilterAttribute, FieldAttributes.Public);

// mi includes a single memeber: publicF1

MemberInfo[] mi =
typeof(c1).FindMembers(MemberTypes.Method, BindingFlags.Public |

BindingFlags.NonPublic |
BindingFlags.Instance, Type.FilterName, "method1*");

//mi includes two members: method1 and method12

jw