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.NET Forum / .NET Framework / New Users / September 2005How to compare objects
Hi guys! I've a function that returns a System.Data.SqlClient.SqlException or System.Int32 depending on the function's result. If occurs an error it returns SQLException; if executes with no problem, it returns the @@IDENTITY of the row which is an Int32 type. Now I need to compare the type and give to the users the feedback. I ask you: how can I compare objects. For example, if the function's result is a SQLException or an Int32 type? Is that technique right? Thanks in advance if (someobject.GetType()) == typeof(SqlException) ...  SignatureHTH, Kevin Spencer Microsoft MVP .Net Developer Big things are made up of lots of little things. > Hi guys! > [quoted text clipped - 11 lines] > > Thanks in advance > if (someobject.GetType()) == typeof(SqlException) ... Note that that would only return true if the object is *exactly* a SqlException - not if it's *derived* from SqlException. It's usually better to use: if (someObject is SqlException) ... or SqlException e = someObject as SqlException if (e != null) ... SignatureJon Skeet - <skeet@pobox.com> http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet If replying to the group, please do not mail me too True on all counts, Jon. SignatureHTH, Kevin Spencer Microsoft MVP .Net Developer Big things are made up of lots of little things. >> if (someobject.GetType()) == typeof(SqlException) ... > [quoted text clipped - 11 lines] > if (e != null) > ... Thanks a lot Kevin! Adding information: VB.NET version If TypeOf objSomeObject.GetType() Is System.Data.SqlClient.SqlException Then ... ElseIf TypeOf... ... Else ... ... End If > if (someobject.GetType()) == typeof(SqlException) ... > [quoted text clipped - 13 lines] > > > > Thanks in advance > Thanks a lot Kevin! > [quoted text clipped - 7 lines] > ... > End If No, that will never work - because you're getting the type of the return value of GetType(), which is always going to be System.Type, never System.Data.SqlClient.SqlException Just use If TypeOf objSomeObject Is System.Data.SqlClient.SqlException Or, as I said, just throw the exception. SignatureJon Skeet - <skeet@pobox.com> http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet If replying to the group, please do not mail me too > I've a function that returns a System.Data.SqlClient.SqlException or > System.Int32 depending on the function's result. If occurs an error it [quoted text clipped - 6 lines] > > Is that technique right? I wouldn't *return* the exception if an error occurs - I'd *throw* the exception. You can then catch it in the error condition (preferrably several stack frames up) or just look at the return value (as an int) if there are no problems. SignatureJon Skeet - <skeet@pobox.com> http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet If replying to the group, please do not mail me too Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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