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POThe predefined type 'System.Threading.Tasks.Task' is defined in multiple assemblies in the global alias
 

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  1. POThe predefined type 'System.Threading.Tasks.Task' is defined in multiple assemblies in the global alias
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    <p>I just have set up a new asp.net mvc 4 project, using the latest .net framework (4.5) in combination with Visual studio 2012. After I added some classes, side projects etc. I suddently notice that I'm receiving 5 times the same warning when I compile the project. The warning states:</p> <blockquote> <p>ASPNETCOMPILER : warning CS1685: The predefined type 'System.Threading.Tasks.Task' is defined in multiple assemblies in the global alias; using definition from 'c:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETFramework\v4.5\mscorlib.dll'</p> </blockquote> <p>So now I'm wondering in which assemblies are this type defined than? All my projects in the solution are using version 4.5 of the .net framework, so 4.5\mscorlib.dll should be the only one or am I missing something?</p> <p>My solutions consists of 4 projects ( 3 class libraries, and 1 mvc-4 web project). The 3 class libraries don't show any warnings when I compile them indepently. It's only the web project which throws the warnings, but the class library projects are referenced by the web project. The references of the web project:</p> <ul> <li>Antlr3.Runtime</li> <li>Microsoft.CSharp</li> <li>Microsoft.Web.Infrastructure</li> <li>System</li> <li>System.Data</li> <li>System.Web.DynamicData</li> <li>System.Web.Entity</li> <li>System.Web.ApplicationServices</li> <li>System.ComponentModel.DataAnnotations</li> <li>System.Core</li> <li>System.Data.DataSetExtensions</li> <li>System.Web.Optimization</li> <li>System.Xml.Linq</li> <li>System.Web</li> <li>System.Web.Extensions</li> <li>System.Web.Abstractions</li> <li>System.Web.Routing</li> <li>System.Xml</li> <li>System.Configuration</li> <li>System.Web.Services</li> <li>System.EnterpriseServices</li> <li>Newtonsoft.Json</li> <li>System.Net.Http </li> <li>System.Net.Http.Formatting</li> <li>System.Net.Http.WebRequest</li> <li>System.Web.Helpers</li> <li>System.Web.Http</li> <li>System.Web.Http.WebHost</li> <li>System.Web.Mvc</li> <li>System.Web.Razor</li> <li>System.Web.WebPages</li> <li>System.Web.WebPages.Deploymen</li> <li>System.Web.WebPages.Razor</li> <li>WebGrease</li> </ul> <p>Does anyone have a suggestion where to look?</p> <p>Thanks in advance</p> <p>BHD</p> <p><strong>UPDATE</strong> It seems that more people have similar issues like this, in my case the answer was: We are using here some company libraries, which were indeed using older versions of the framework (3.5) and caused the warnings.</p>
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    1. USMaarten Kieft
    1. USMaarten Kieft
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      1. POThe predefined type 'System.Threading.Tasks.Task' is defined in multiple assemblies in the global alias
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      1. POThe predefined type 'System.Threading.Tasks.Task' is defined in multiple assemblies in the global alias
      1. USMaarten Kieft
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      1. POThe predefined type 'System.Threading.Tasks.Task' is defined in multiple assemblies in the global alias
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    1. COHas the computer where this happens, earlier had other versions of .NET 4.5 or .NET 4.0 installed?
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      1. POThe predefined type 'System.Threading.Tasks.Task' is defined in multiple assemblies in the global alias
      1. USJeppe Stig Nielsen
    2. COYour message doesn't specify what the other assembly is. Try, inside the same project that gives you the CS1685 warning, to introduce this variable: `global::System.Threading.Tasks.Task test = null;`. It should give you another error, like `error CS0433: The type 't' exists in both 'x' and 'y'` where `x` and `y` are the two assemblies in question.
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      1. POThe predefined type 'System.Threading.Tasks.Task' is defined in multiple assemblies in the global alias
      1. USJeppe Stig Nielsen
    3. COGood thinking Jeppe, I tried it, but no luck. Still the warnings, no error.
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      1. POThe predefined type 'System.Threading.Tasks.Task' is defined in multiple assemblies in the global alias
      1. USMaarten Kieft
 

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