Interop type cannot be embedded

Question

I am creating a web application on the  NET 4 0 framework  beta2  in C    When I try to use a assembly called  ActiveHomeScriptLib   I get the following error      Interop type    ActiveHomeScriptLib ActiveHomeClass    cannot be embedded  Use the applicable   interface instead    When I change the framework to version 3 5  I don t have any errors   What is an Interop Type and why does this only occur when I use the 4 0 framework

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Here s where to set the Embed Interop in Visual Studio 2012

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In most cases  this error is the result of code which tries to instantiate a COM object  For example  here is a piece of code starting up Excel   Excel ApplicationClass xlapp   new Excel ApplicationClass      Typically  in  NET 4 you just need to remove the  Class  suffix and compile the code   Excel Application xlapp   new Excel Application      An MSDN explanation is here

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Like Jan It took me a while to get it     S So for anyone else who s blinded with frustration    Right click the offending assembly that you added in the solution explorer under your project References   In my case WIA  Click properties   And there should be the option there for Embed Interop Assembly  Set it to False

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Got the solution   Go to references right click the desired dll you will get option  Embed Interop Types  to  False  or  True

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NET 4 0 allows primary interop assemblies  or rather  the bits of it that you need  to be embedded into your assembly so that you don t need to deploy them alongside your application   For whatever reason  this assembly can t be embedded - but it sounds like that s not a problem for you  Just open the Properties tab for the assembly in Visual Studio 2010 and set  Embed Interop Types  to  False    EDIT  See also Michael Gustus s answer  removing the Class suffix from the types you re using

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I ran into this issue when pulling down a TFS project to my local machine  Allegedly  it was working fine on the guy s machine who wrote it  I simply changed this     WshShellClass shellClass   new WshShellClass      To this     WshShell shellClass   new WshShell      Now  it is working like a champ

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I had same problem in VB NET 2013 with Office 2007  and this solved it   VS 2013 VB NET Project   Props   Refs   Microsoft Word 12 0 Object Lib   Embed Interop Types  change True to False

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Expanding on Jon s correct answer   The problem here is that your are combining the new  Embed Interop Types   or NoPIA  feature with use of a class type   The  Embed Interop Types  feature works by essentially statically linking in all of the types from a PIA  Primary Interop Assembly  into the referencing assembly removing the overhead of deploying it     This feature works great for most types in a PIA but it does have restrictions   One of them is that you cannot embed classes  it s a servicing issue    Misha has a detailed blog article on why this is not allowed   http   blogs msdn com mshneer archive 2009 12 07 interop-type-xxx-cannot-be-embedded-use-the-applicable-interface-instead aspx

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Visual Studio 2017 version 15 8 made it possible to use the PackageReferencesyntax to reference NuGet packages in Visual Studio Extensibility  VSIX  projects  This makes it much simpler to reason about NuGet packages and opens the door for having a complete meta package containing the entire VSSDK   Installing below NuGet package will solve the EmbedInteropTypes Issue      Install-Package Microsoft VisualStudio SDK EmbedInteropTypes

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http   digital ni com public nsf allkb 4EA929B78B5718238625789D0071F307  This error occurs because the default value is true for the Embed Interop Types property of the TestStand API Interop assembly referenced in the new project  To resolve this error  change the value of the Embed Interop Types property to False by following these steps  Select the TestStand Interop Assembly reference in the references section of your project in the Solution Explorer  Find the Embed Interop Types property in the Property Browser  and change the value to False

[c#] Interop type cannot be embedded

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