The. Net Framework 4.5.1 ASP 5 under New View ungrateful "error while running the selected code generator failed to retrieve metadata there is no parameterless constructor defined for the object"

When creating a new view in the controller, the view interface is selected as follows:

The following error is reported when the add is executed:

The error content is:

Error
An error occurred while running the selected code generator

Unable to retrieve metadata for ' XXX '
No parameterless constructor is defined for this object

Unable to retrieve metadata for ' XXX '. No parameterless constructor defined for the this object.

This mistake has always misled me, thought is the model class question, looked for half a day to find the solution, depressed to die, later discovered is the data context question.

Think of the solution using the DB First + EF + MEF, without the data context so leave it blank, the miracle happened, the view created successfully, how low-level error ...