Ordered Dictionary Loses Value
Oct 3, 2011
I am building a "query tool" so I am creating queries on the fly using DropDownLists (DDLs) to select table and field names. I have selected a Ordered dictionary to retain the association between field name and data type which I need to build my query string, to insert # for dates and quotes for strings. (I don't know that I could parameterize this process without creating a virtual nightmare of complexity) I am building the content of the field DDL in the onChange event of the table DDL using a function DDL_TableNames_SelectedIndexChanged() that returns a DataTable of selected fieldnames. Because I ran into so much trouble trying to include the field type in this process, I separated the two and am now using the ordered dictionary to remember what data type each of the selected fields is.
The problem lies in the fact that the ordered dictionary loses its value in subsequent Postback operations. So it populates on Postback, but resets after that since when I try to use the contents of the ordered dictionary it has no values.
Code:
'Dim global OrderedDictionary variable
Dim dicFieldNameType As New OrderedDictionary()
Protected Sub _DDL_TableNames_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles DDL_TableNames.SelectedIndexChanged
Dim vTableName As String
[code]...
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