Question

I have this entity, want to update using entityframework

 EmployeeModel employee = new EmployeeModel
    {
        Id = 1000, //This one must 
        FirstName = modifiedValue,
        Email = modifiedValue, 
        LastName = originalValue,
        Phone = originalValue
    };

Code to update

_db.ObjectStateManager.ChangeObjectState(employee, EntityState.Modified);  
_db.SaveChanges();

This is the SQL statement got once updated

Update Employee set Id=1138,FirstName='modifiedValue',Email='modifiedValue',LastName= 'OriginalValue',phone='originalValue' where Id=1138

But I am expecting this

Update Employee set FirstName='modifiedValue', Email='modifiedValue' where Id=1138.

I dont know what I am missing here. Please let me know.

Answer 1

This is the solution I got

 var entity = _db.CreateObjectSet<Employee>();
 entity.Detach(employee);
 entity.Attach(employee);

 foreach (string modifiedPro in employeeModel.ModifiedProperties){
  _db.ObjectStateManager.GetObjectStateEntry(employee).SetModifiedProperty(modifiedPro);}

  _db.SaveChanges();

Only modified values in the sql update statement

Update Employee set FirstName='modifiedValue', Email='modifiedValue' where Id=1138.

If anybody knows better answer than this, Please post your suggestions