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Condition is never met when no queryString is presented

Posted on 2013-05-20
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Last Modified: 2014-01-25
Either none of these will be presented or one will be presented. When none is presented the condition is never hit

        Private _page As String = HttpUtility.UrlEncode(HttpContext.Current.Request.QueryString("Page"))
        Private _pge As String = HttpUtility.UrlEncode(Page.RouteData.Values("page"))

         Private Function getPage() As String
            Dim ret As String = ""
            If String.IsNullOrEmpty(_page) = True AndAlso String.IsNullOrEmpty(_pge) = True Then
                ret = 1
            ElseIf String.IsNullOrEmpty(_page) = False AndAlso String.IsNullOrEmpty(_pge) = True Then
                ret = _page
            ElseIf String.IsNullOrEmpty(_page) = True AndAlso String.IsNullOrEmpty(_pge) = False Then
                ret = _pge
            End If
            Return ret
        End Function

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Question by:ruffone
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3 Comments
 
LVL 36

Expert Comment

by:Miguel Oz
ID: 39183872
Your if logic is not covering the following condition
String.IsNullOrEmpty(_page) = False AndAlso String.IsNullOrEmpty(_pge) = False

thus ret is set to "" as none of the if logic conditions is fired.
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LVL 4

Author Comment

by:ruffone
ID: 39184547
when I made this the second call the third and fourth condition no longer  got met. When I made it the last condition I got this error on the pge declaration

Overload resolution failed because no Public 'UrlEncode' is most specific for these arguments:
    'Public Shared Function UrlEncode(str As String) As String':
        Not most specific.
    'Public Shared Function UrlEncode(bytes As Byte()) As String':
        Not most specific.
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LVL 36

Accepted Solution

by:
Miguel Oz earned 500 total points
ID: 39185937
Page.RouteData.Values("page") can return a null value that can not be processed by UrlEncode, thus you need to check for it as shown below:
If Page.RouteData.Values("page") is Nothing then
   _pge = ""

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Note: you can put this code on Page_Load event before calling GetPage method.

Check :
http://stackoverflow.com/questions/13783675/check-if-page-routedata-values-has-a-value
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