FieldInfo Class
Discovers the attributes of a field and provides access to field metadata.
Assembly: mscorlib (in mscorlib.dll)
'Declaration <SerializableAttribute> _ <ComVisibleAttribute(True)> _ <ClassInterfaceAttribute(ClassInterfaceType.None)> _ <PermissionSetAttribute(SecurityAction.InheritanceDemand, Name := "FullTrust")> _ Public MustInherit Class FieldInfo _ Inherits MemberInfo _ Implements _FieldInfo 'Usage Dim instance As FieldInfo
The field information is obtained from metadata. The FieldInfo class does not have a public constructor. FieldInfo objects are obtained by calling either the GetFields or GetField method of a Type object.
Fields are variables defined in the class. FieldInfo provides access to the metadata for a field within a class and provides dynamic set and get functionality for the field. The class is not loaded into memory until invoke or get is called on the object.
Notes to Inheritors:When you inherit from FieldInfo, you must override the following members: GetValue and SetValue.
The following example uses the Type.GetFields method to get the field-related information from the FieldInfo class, and then displays field attributes.
Imports System Imports System.Reflection Imports Microsoft.VisualBasic Public Class FieldInfoClass Public myField1 As Integer = 0 Protected myField2 As String = Nothing Public Shared Sub Main() Dim myFieldInfo() As FieldInfo Dim myType As Type = GetType(FieldInfoClass) ' Get the type and fields of FieldInfoClass. myFieldInfo = myType.GetFields(BindingFlags.NonPublic Or _ BindingFlags.Instance Or BindingFlags.Public) Console.WriteLine(ControlChars.NewLine & "The fields of " & _ "FieldInfoClass class are " & ControlChars.NewLine) ' Display the field information of FieldInfoClass. Dim i As Integer For i = 0 To myFieldInfo.Length - 1 Console.WriteLine(ControlChars.NewLine + "Name : {0}", myFieldInfo(i).Name) Console.WriteLine("Declaring Type : {0}", myFieldInfo(i).DeclaringType) Console.WriteLine("IsPublic : {0}", myFieldInfo(i).IsPublic) Console.WriteLine("MemberType : {0}", myFieldInfo(i).MemberType) Console.WriteLine("FieldType : {0}", myFieldInfo(i).FieldType) Console.WriteLine("IsFamily : {0}", myFieldInfo(i).IsFamily) Next i End Sub End Class
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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.