Cannot convert lambda expression to type string because it is not a delegate type

Question

I am using a LINQ lambda expression like so    int Value   1  qryContent objContentLine   using  Entities db   new Entities          objContentLine    from q in db qryContents                       where q LineID    Value                       orderby q RowID descending                       select q  FirstOrDefault        However  I am getting the following error      Cannot convert lambda expression to type  string  because it is not a delegate type

User · Answer

My case it solved i was using    Html DropDownList model   gt  model TypeId          using   Html DropDownListFor model   gt  model TypeId         will solve it

User · Answer

In my case  I had to add using System Data Entity

User · Answer

For people just stumbling upon this now  I resolved an error of this type that was thrown with all the references and using statements placed properly  There s evidently some confusion with substituting in a function that returns DataTable instead of calling it on a declared DataTable  For example   This worked for me   DataTable dt   SomeObject ReturnsDataTable     List lt string gt  ls   dt AsEnumerable   Select dr   gt  dr  name   ToString    ToList lt string gt       But this didn t   List lt string gt  ls   SomeObject ReturnsDataTable   AsEnumerable   Select dr   gt  dr  name   ToString    ToList lt string gt       I m still not 100  sure why  but if anyone is frustrated by an error of this type  give this a try

User · Answer

I think you are missing using System Linq  from this system class   and also add using System Data Entity  to the code

User · Answer

If it s not related to missing using directives stated by other users  this will also happen if there is another problem with your query  Take a look on VS compiler error list   For example  if the  quot Value quot  variable in your query doesn t exist  you will have the  quot lambda to string quot  error  and a few errors after another one more related to the unknown erroneous field  In your case it could be   objContentLine    from q in db qryContents                   where q LineID    Value                   orderby q RowID descending                   select q  FirstOrDefault     Errors   Error 241 Cannot convert lambda expression to type  string  because it is not a delegate type Error 242 Delegate  System Func lt    gt   does not take 1 arguments Error 243 The name  Value  does not exist in the current context  Fix the  quot Value quot  variable error and the other errors will also disappear

[c#] Cannot convert lambda expression to type 'string' because it is not a delegate type

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