Re image store in database in binary format using mvc 4 and entity framework


To provide data to the view for the list of check boxes, you'll use a view model class. Instead of using the model binder to update the Courses navigation property, you'll do that in the new UpdateInstructorCourses method. The Course Index page is displayed with the updated course data. Instructors may teach any number of courses.

The check boxes all have the same name "selectedCourses"which informs the model binder that they are to be treated as a group. Change data on the page and click Save. SingleOrDefault ; if department!

This doesn't require any change to the code that calls TryUpdateModel because you're using the whitelisting overload and Courses isn't in the include list. For most relationships, this can be done by updating either foreign key fields or navigation properties. Change data on the page and click Save. Change some course assignments and click Save. Notice that in order to be able to add courses to the Courses navigation property you have to initialize the property as an empty collection:

The HttpGet Edit method sets the selected item, based on the ID of the department that is already assigned to the course being edited:. Next, add the code that's executed when the user clicks Save. Instead, you add and remove entities to and from the Instructor. If the user changes the value of an office assignment, you must change the value in an existing OfficeAssignment entity.

Infrastructure; The PopulateDepartmentsDropDownList method gets a list of all departments sorted by name, creates a SelectList collection for a drop-down list, and passes the collection to the view in a ViewBag property. For more information on the upcoming change, we invite you to read our blog post. The UI that enables you to change which courses an instructor is assigned to is a group of check boxes.

For collections that are much larger, a different UI and a different updating method would be required. There's already a hidden field Html. This code creates an HTML table that has three columns. If the user clears the office assignment and it originally had a value, you must remove and delete the OfficeAssignment entity.

Notice that in order to be able to add courses to the Courses navigation property you have to initialize the property as an empty collection: Replace the HttpPost Edit method with the following code. The method signature is now different from the HttpGet Edit method, so the method name changes from EditPost back to Edit. Instructors may teach any number of courses. If you modify the Courses property in this way, you can remove the explicit property initialization code in the controller.

Change some course assignments and click Save. The UI that enables you to change which courses an instructor is assigned to is a group of check boxes. Try again, and if the problem persists, see your system administrator. Courses navigation property, the course is added to the collection in the navigation property.