无法使用asp.net/c#在实体框架中编辑

Question

 public ReturnMessage EditCategories(Category objCategory)
    {


        ReturnMessage objReturnMessage = new ReturnMessage();
        try
        {
            Category objCategoryNew = db.Categories.Where(x => x.CategoryId == objCategory.CategoryId).FirstOrDefault();
            if (objCategoryNew != null)
            {
                objCategoryNew = objCategory;
                db.SaveChanges();
                objReturnMessage.isSuccessfull = true;
                objReturnMessage.responseMessage = "Successfully updated.";
            }
            else
            {
                objReturnMessage.isSuccessfull = false;
                objReturnMessage.responseMessage = "Category not present.";
            }
        }
        catch (Exception ex)
        {
            objReturnMessage.isSuccessfull = false;
            objReturnMessage.responseMessage = ex.Message;
        }
        return objReturnMessage;

    }

Everything goes fine there are no exceptions still the data isn't getting updated. I don't know what's the issue. Please help?

Answer 1

The line:

objCategoryNew = objCategory;

will not work out since you change the reference objCategoryNew to objCategory , not the object itself, what you have to do is to assign each property of objCategory to objCategoryNew , something like:

objCategoryNew.Pro1 = objCategory.Pro1;
objCategoryNew.Pro2 = objCategory.Pro2;
....