getting the data type for a class field

[Larry]

I'm having trouble finding the right method to determine at runtime the data
type of the fields in a class.

here's what I've got so far:
Public Class ImgSubmissionRe cord

Public fileName As String

Public thumbnail As Bitmap

Public fileSize As Int64

Public fileDate As DateTime

Public disposition As Int16

End Class

Imports System.Reflecti on

Public Class debugControl

Inherits System.Web.UI.U serControl

#Region " Web Form Designer Generated Code "

'This call is required by the Web Form Designer.

<System.Diagnos tics.DebuggerSt epThrough()> Private Sub InitializeCompo nent()

End Sub

Protected WithEvents lblDebug As System.Web.UI.W ebControls.Labe l

'NOTE: The following placeholder declaration is required by the Web Form
Designer.

'Do not delete or move it.

Private designerPlaceho lderDeclaration As System.Object

Private Sub Page_Init(ByVal sender As System.Object, ByVal e As
System.EventArg s) Handles MyBase.Init

'CODEGEN: This method call is required by the Web Form Designer

'Do not modify it using the code editor.

InitializeCompo nent()

End Sub

#End Region

Private Sub Page_Load(ByVal sender As System.Object, ByVal e As
System.EventArg s) Handles MyBase.Load

Dim anObject As New ImgSubmissionRe cord

Dim MemInfo, memInfoArray() As MemberInfo

Dim aType As Type = anObject.GetTyp e

memInfoArray = aType.GetMember s(BindingFlags. Public Or
BindingFlags.In stance)

For Each MemInfo In memInfoArray

Me.lblDebug.Tex t = Me.lblDebug.Tex t + "<br>" + MemInfo.Name + "/" +
System.Type.Get Type(MemInfo.Ge tType.ToString) .ToString

Next

End Sub

End Class

I get the name for each member of the class ok, but for the type I get

"System.Reflect ion.RuntimeFiel dInfo"

instead of string or int16, or bitmap, or whatever type the member is. How
do I get this information at runtime?



-Larry

[Scott Allen]

Re: getting the data type for a class field

Hi Larry:

On Wed, 5 Oct 2005 21:59:08 -0700, "Larry" <hughes00@comca st.net>
wrote:
[color=blue]
>I'm having trouble finding the right method to determine at runtime the data
>type of the fields in a class.
>[/color]

....
[color=blue]
>
>memInfoArray = aType.GetMember s(BindingFlags. Public Or
>BindingFlags.I nstance)
>[/color]

The problem is GetMembers will return fields and methods (all
members). Since methods don't have a type the MemberInfo objects don't
have a property to tell you the type of the member.

What you really want to use is GetFields, which returns an array of
FieldInfo. A FieldInfo object has a FieldType property, which can tell
you the type of the field (String, Int32, Hashtable, etc).

HTH,

--
Scott

http://www.OdeToCode.com/blogs/scott/

[Larry]

Re: getting the data type for a class field

Thanks. I'll give that a try.

-Larry

"Scott Allen" <scott@nospam.o detocode.com> wrote in message
news:9r9ak1hs68 ti5btlnmn3cv72s jinmje5f6@4ax.c om...[color=blue]
> Hi Larry:
>
> On Wed, 5 Oct 2005 21:59:08 -0700, "Larry" <hughes00@comca st.net>
> wrote:
>[color=green]
>>I'm having trouble finding the right method to determine at runtime the
>>data
>>type of the fields in a class.
>>[/color]
>
> ...
>[color=green]
>>
>>memInfoArra y = aType.GetMember s(BindingFlags. Public Or
>>BindingFlags. Instance)
>>[/color]
>
> The problem is GetMembers will return fields and methods (all
> members). Since methods don't have a type the MemberInfo objects don't
> have a property to tell you the type of the member.
>
> What you really want to use is GetFields, which returns an array of
> FieldInfo. A FieldInfo object has a FieldType property, which can tell
> you the type of the field (String, Int32, Hashtable, etc).
>
> HTH,
>
> --
> Scott
> http://www.OdeToCode.com/blogs/scott/[/color]