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POOverloaded method signatures - compiler see nullable types as synynomous to regular value type
 

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  1. POOverloaded method signatures - compiler see nullable types as synynomous to regular value type
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    <p>We have a library with many methods that are overloaded with the method signature changing from value type to nullable value type as you see below:</p> <p>A.) <code>IsEmpty(int obj, int defaultValue)</code></p> <p>B.) <code>IsEmpty(int? obj, int defaultValue)</code></p> <p>As you can see the only difference is that B is nullable. On most workstations in my office, this overloading compiles and the types are recognized as truly distinct.</p> <p>However, for some reason, all of my machines and VMs will not compile. We are currently baffled as to why this is happening. The machines I am using should be near mirror images of other machines that are working/compiling.</p> <p><strong>Here is a sample of the error that ensues during compilation:</strong></p> <blockquote> <ul> <li><p>Error 28 The call is ambiguous between the following methods or properties: 'BayTech.Common.Fix.IfEmpty(System.Guid, System.Guid)' and 'BayTech.Common.Fix.IfEmpty(System.Guid, System.Guid?)' C:\Projects\Applications\JukeWeb\BayTech\Internal\Common Library\VS2010\Apps\BayTech.Common\Conversion\Fix.Empty.SL.cs 55 17 BayTech.Common</p></li> <li><p>Error 11 The call is ambiguous between the following methods or properties: 'BayTech.Common.Fix.IfEmpty(System.DateTime, System.DateTime)' and 'BayTech.Common.Fix.IfEmpty(System.DateTime, System.DateTime?)' C:\Projects\Applications\JukeWeb\BayTech\Internal\Common Library\VS2010\Apps\BayTech.Common\Conversion\Fix.Empty.SL.cs 35 17 BayTech.Common</p></li> <li><p>Error 165 The call is ambiguous between the following methods or properties: 'BayTech.Common.Fix.IfEmpty(string, System.Guid)' and 'BayTech.Common.Fix.IfEmpty(string, System.Guid?)' C:\Projects\Applications\JukeWeb\BayTech\Internal\Common Library\VS2010\Apps\BayTech.Common\Conversion\Fix.IfEmpty.Xml.cs 259 17 BayTech.Common</p></li> </ul> </blockquote> <p>Does anyone have an idea why this would be happening?</p> <p><strong>Here's some information on the environment setup:</strong></p> <ul> <li>VS2010</li> <li>Idealblade (most recent install)</li> <li>Telerik controls installed including Just-In-Code</li> <li>All services packs included for VS and Windows 7</li> <li>All services packs included for VS and Windows 7</li> <li>Win7 Ultimate</li> <li>SQL 2008 R2 </li> <li>VSExtensions for T4 templates, PostSharp, </li> <li>Codesmith Professional installed</li> <li>VisualSVN installed</li> <li>DevExpress</li> <li>SQLComplete installed</li> </ul>
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    1. USJohn Saunders
    1. USJukeman
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      1. USBlorgbeard
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    1. COWhat the point of "IsEmpty(int obj, int defaultValue)" ?
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      1. USLarry
    2. CONote that nullable types are also value types.
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      1. USIlya Kogan
    3. COThe overloads in the error messages are not the overloads that you posted in code. Why? Can you post consistent information?
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      1. USusr
 

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