The data reader is incompatible with the specified Entity Framework

Question

I have a method that will return the bare min results from a sproc to fill a select menu. When I want the bare min results I pass bool getMin = true to the sproc, and when I

Answer 1

I understand this is an old post; but, I wanted to share what I learned tonight about this. What I found that the 'most relevant portion of the error message is stating' is this.

db.proc_GetFramingSystems(brandID, frameType, glazeMethod, getMin).ToList();

is expecting a column to be returned from the stored procedure with the alias of 'FrameType'.

I ran into this when I created a POCO (plain old clr object) class of my table with more programmer friendly names. Instead of a strongly typed name of say 'email_address', I wanted 'EmailAddy' and so forth. I created a mapped class stating this among other mapped columns.

this.Property(t => t.EmailAddy).HasColumnName("email_address");

Although this is necessary for other parts of EF to work, the mapping class is not referenced when executing a db.SqlQuery. So, when the code below executes

var a = new SqlParameter("@fshipno", shipno);
return _context.db.SqlQuery("exec spGetEmailAddy @fshipno", a).ToList();

It generated the same error except instead of 'FrameType', it mentioned 'EmailAddy'. The fix... I had to alias the 'email_address' column in my stored procedure to 'EmailAddy' to get it to map the returned dataset to my POCO.

EDIT: I have found that this only works if your method is returning an IEnumberable

public IEnumberable GetMyPoco()

You will get the same error message if you are attempting to return a single POCO object.

public myPOCO GetMyPoco()