CODEWITHSUNDEEP
vb.netvisual-studio-2010typesreferencecopy
Uriel Katz
Uriel Katz

Reputation: 329

How to know wheter a type is a reference type or a value type in Visual Studio

How do you know whether a type is a reference type or a value type. For example, according to an about.com article (http://visualbasic.about.com/b/2005/10/29/when-is-a-copy-not-a-copy.htm) an integer type is always a value type while an array type may be a value type or a reference type. On the same note, when copying a cookiecontainer must one use the clone() method or does = work as well? That is will = create a copy or a reference of a cookiecontainer?

NOTE: It seems to me that by how it is used in this code, = creates a copy.

From: http://howtostartprogramming.com/vb-net/vb-net-tutorial-52-httpwebrequest-cookiecontainer/

Imports System.Net
Imports System.Text
Imports System.IO

Public Class Form1

    Dim logincookie As CookieContainer

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

        Dim postData As String = "referer=http%3A%2F%2Fforums.zybez.net%2Findex.php%3Fapp%3Dcore%26module%3Dglobal%26section%3Dlogin&username=" & TextBox1.Text & "&password=" & TextBox2.Text & "&rememberMe=1"
        Dim tempCookies As New CookieContainer
        Dim encoding As New UTF8Encoding
        Dim byteData As Byte() = encoding.GetBytes(postData)

        Dim postReq As HttpWebRequest = DirectCast(WebRequest.Create("http://forums.zybez.net/index.php?app=core&module=global&section=login&do=process"), HttpWebRequest)
        postReq.Method = "POST"
        postReq.KeepAlive = True
        postReq.CookieContainer = tempCookies
        postReq.ContentType = "application/x-www-form-urlencoded"
        postReq.Referer = "http://forums.zybez.net/index.php?app=core&module=global&section=login&do=process"
        postReq.UserAgent = "Mozilla/5.0 (Windows; U; Windows NT 6.1; ru; rv:1.9.2.3) Gecko/20100401 Firefox/4.0 (.NET CLR 3.5.30729)"
        postReq.ContentLength = byteData.Length

        Dim postreqstream As Stream = postReq.GetRequestStream()
        postreqstream.Write(byteData, 0, byteData.Length)
        postreqstream.Close()
        Dim postresponse As HttpWebResponse

        postresponse = DirectCast(postReq.GetResponse(), HttpWebResponse)
        tempCookies.Add(postresponse.Cookies)
        logincookie = tempCookies
        Dim postreqreader As New StreamReader(postresponse.GetResponseStream())

        Dim thepage As String = postreqreader.ReadToEnd

        RichTextBox1.Text = thepage

    End Sub


    Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click

        Dim request As HttpWebRequest = DirectCast(WebRequest.Create("http://forums.zybez.net/index.php?app=core&module=usercp"), HttpWebRequest)
        request.CookieContainer = logincookie
        Dim response As HttpWebResponse = DirectCast(request.GetResponse(), HttpWebResponse)
        Dim reader As New StreamReader(response.GetResponseStream())
        Dim theusercp As String = reader.ReadToEnd

        RichTextBox2.Text = theusercp

    End Sub
End Class

UPDATE 1

From MSDN (http://msdn.microsoft.com/en-us/library/t63sy5hs.aspx) all classes are reference types therefore making cookiecontainer a reference type.

Upvotes: 0

Views: 162

Answers (1)

Rex
Rex

Reputation: 2140

is this what you want:

dim x = 100
dim isValueType = x.GetType.IsValueType

Upvotes: 2

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