How should I validate parameters passed into my WCF service?

Question

Normally you check incoming parameters in your public methods using if-then-throw pattern or Code Contracts.
My question is, how should I validate parameters passed in my WCF service? For example, I've got the following contract:

[OperationContract] Stock GetStock(string symbol);

I want to ensure that symbolparameter is not null or empty string. Should I use the same if-then-throw pattern or Code Contracts precondition on the service-side? Should I add a FaultContract attribute to the GetStock method and return a fault to the client? What's the best parameters validation technique for WCF service?

ErnieL · Accepted Answer · 2012-05-31 19:08:53Z

5

Enterprise Library Validation Application Block has an adaptor for integration with WCF designed for exactly this.

This CodeProject Introduction is a little old but gives a bit more background than the MSDN links.

answered May 31, 2012 at 19:08

ErnieL

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3 Comments

LCJ Over a year ago

Can Data Annotaion do this job?

ErnieL Over a year ago

You can use it for validation, but its in a different technology stack from WCF. System.ComponentModel.DataAnnotations is for ASP.NET MVC and ASP.NET data controls.

Schalk Over a year ago

For anybody getting a "operation.SyncMethod" error with VAB and WCF, VAB does not seem to support async, alternatively look at Validating wcf service operations using system.componentmodel.dataannotations

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