DateTimeOffsetAdapter interfering with WCF serialization of DateTimeOffset objects

Question

I have a WCF service reference (= client proxy) generated by Visual Studio 2008 (.net 3.5 sp1). The generated code contains a data contract with DateTimeOffset properties so naturally VS decorated it with KnowTypeAttribute(System.DateTimeOffset).

Whenever I invoke a WCF operation that returns the above mentioned data contract, I get the following exception:

Type 'System.DateTimeOffset' cannot be added to list of known types since another type 'System.Runtime.Serialization.DateTimeOffsetAdapter' with the same data contract name 'http://schemas.datacontract.org/2004/07/System:DateTimeOffset' is already present

I understand that DateTimeOffsetAdapter is a struct in System.Runtime.Serialization that is used when serializing DateTimeOffset objects. So why does it cause this exception and how can this be fixed or avoided?

@billybob Most likely I've used a different type than DateTimeOffset - It's been too long for me to remember. But had I found a good solution I would have posted it here. Sorry. — urig, Aug 30 '15 at 15:14

killercowuk · Accepted Answer · 2015-08-28T16:17:48.457

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In my case the issue seemed to stem from having .Net 4 installed prior to adding IIS as a feature to Windows 7.

A colleague and I fixed the issue by opening an elevated (Run As Administrator) command prompt. Then ran the following:

cd C:\Windows\Microsoft.NET\Framework64\v4.0.30319
aspnet_regiis.exe -i

Hope this helps someone!

edited Aug 28 '15 at 16:17

answered May 29 '13 at 13:15

killercowuk

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There's an error in the path: Should be `C:\Windows\Microsoft.NET\Framework64\v4.0.30319` – billybob Aug 28 '15 at 16:02

score 0 · Answer 2 · answered Oct 20 '11 at 07:02

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I don't know why. But to solve the problem try to migrate your project to .NET Framework version 4

answered Oct 20 '11 at 07:02

Alfer

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DateTimeOffsetAdapter interfering with WCF serialization of DateTimeOffset objects

2 Answers2