Failed To Add Relation(s). An Item With The Same Key Has Already Been Added

Jun 6, 2007

I am developing a small project that converts a dataset to an equivalent structure in SqlCe. The application converts every field, table and constraints to SqlCe, decomposing de dataset structure into Sql sentences.

The application works fine, the tables and constraints are reconstructed without error. but I found some issues:
After conversion, the usual test is to connect to SqlCe, using Data->Add New Data Source and generate a dataset from the resulting tables.

I found that some tables throw the following message:

Failed to add relation(s).An item with the same key has already been added.

After that, the dataset returned contains the tables, but not the relations.
After some trial I found that Data Source Configuration Wizard (DSCW) has some problem with foreign keys using Primary keys with multiple fields. If I drop that foreign keys, DSCW inferes the dataset without problem.

Interesting note: I am able to convert the dataset to an Sql Server using the same Sql sentences. If I use Data Source Configuration Wizard I have no errors.

Any advise to understand of fix this problem will be aprecciated.
Is that a bug from DSCW ?
Thanks
Fernando

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Not 100% sure how to do this so I would appreciate some directions. I have 2 tables, Systems and Contacts. A system can have 1 to infinite contacts and contact can have 1 to infinite systems. So I use a 3rd table Sys_Con to add the contact needed for each system.
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Item has already been added. Key in dictionary: "@CityTown" Key being added: "@CityTown"
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.ArgumentException: Item has already been added. Key in dictionary: "@CityTown" Key being added: "@CityTown"

Source Error:


Line 20:
Line 21: 'Creates parameters for the WHERE statement taking the querystring contents from previous page
Line 22: dsPropertyListing.Parameters.Add("@CityTown", CityTown)
Line 23: dsPropertyListing.Parameters.Add("@Suburb", Suburb)
Line 24: dsPropertyListing.Parameters.Add("@Rooms", Rooms)


Source File: K:detailsdetailspropertylisting.aspx Line: 22

Stack Trace:


[ArgumentException: Item has already been added. Key in dictionary: "@CityTown" Key being added: "@CityTown"]
System.Collections.Hashtable.Insert(Object key, Object nvalue, Boolean add) +931
System.Collections.Hashtable.Add(Object key, Object value) +11
ASP.detailspropertylisting_aspx.Page_Load(Object sender, EventArgs e) in K:detailsdetailspropertylisting.aspx:22
System.EventHandler.Invoke(Object sender, EventArgs e) +0
System.Web.UI.Control.OnLoad(EventArgs e) +55
System.Web.UI.Control.LoadRecursive() +27
System.Web.UI.Page.ProcessRequestMain() +731


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