One or more types required to compile a dynamic expression cannot be found Are you missing references to Microsoft CSharp dll and System Core dll

Question

I am trying to compile this code in Microsoft Visual C  2010  using System  using System Globalization    class main       static void Main                  dynamic d          d    dyna           Console WriteLine d                 but I am getting these two errors  Error  1   Predefined type  Microsoft CSharp RuntimeBinder Binder  is not defined or imported  Error 2        One or more types required to compile a dynamic expression cannot be found  Are you missing references to Microsoft CSharp dll and System Core dll   I read this other post but I am new to C  and I couldn t understand what really is the problem  Especially what and where are these so called  config files

User · Answer

I had the same issue except removing and adding the reference back did not fix the error, so I changed .Net version from 4.5 to 4.5.1.

To achieve this go to your web.config file and change the following lines

<compilation debug="true" targetFramework="4.5" />
<httpRuntime targetFramework="4.5" />

to this

<compilation debug="true" targetFramework="4.5.1" />
<httpRuntime targetFramework="4.5.1" />

and rebuild.

User · Answer

On your solution explorer window  right click to References  select Add Reference  go to  NET tab  find and add Microsoft CSharp  Alternatively add the Microsoft CSharp NuGet package  Install-Package Microsoft CSharp

User · Answer

For me  removing and re-adding a reference to Microsoft CSharp fixed the problem temporarily until the affected file was edited  Closing Visual Studio and reopening the project fixed it more long-term  so that s an option if this situation occurs while Microsoft CSharp is already referenced   Maybe restarting the IDE as a first step seems trivial  but here s a reminder for people like me who don t think of that as the first thing to do

User · Answer

Red lines under the ViewBag was my headache for 3 month    Just remove the Microsoft CSharp reference from project and then add it again

User · Answer

None of these worked for me     My class libraries were definitely all referencing both System Core and Microsoft CSharp   Web Application was 4 0 and couldn t upgrade to 4 5 due to support issues   I was encountering the error compiling a razor template using the Razor Engine  and only encountering it intermittently  like after web application has been restarted   The solution that worked for me was manually loading the assembly then reattempting the same operation             bool retry   true          while  retry                        try                               string textTemplate   File ReadAllText templatePath                   Razor CompileWithAnonymous textTemplate  templateFileName                   retry   false                            catch  TemplateCompilationException ex                                LogTemplateException templatePath  ex                   retry   false                   if  ex Errors Any e    gt  e ErrorNumber     CS1969                                          try                                                logger InfoFormat  Attempting to manually load the Microsoft CSharp RuntimeBinder Binder                            Assembly csharp   Assembly Load  Microsoft CSharp  Version 4 0 0 0  Culture neutral  PublicKeyToken b03f5f7f11d50a3a                            Type type   csharp GetType  Microsoft CSharp RuntimeBinder Binder                            retry   true                                            catch Exception exLoad                                                 logger Error  Failed to manually load runtime binder   exLoad                                                            if   retry                      throw                            Hopefully this might help someone else out there

User · Answer

I had the same problem and solved it by removing  Microsoft CSharp  reference from the project and then added it again

User · Answer

If you miss  Microsoft CSharp dll this error can occur  Check you project references

User · Answer

Make sure that your project is targeting the  NET framework 4 0   Visual Studio 2010 supports  NET 3 5 framework target also  but  NET 3 5 does not support the dynamic keyword   You can adjust the framework version in the project properties   See http   msdn microsoft com en-us library bb398202 aspx for more info

[c#] One or more types required to compile a dynamic expression cannot be found. Are you missing references to Microsoft.CSharp.dll and System.Core.dll?

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