Is there a way to let two children objects reference the same base object using inheritance?

Warning: "Object is overridden. Object is not overridden by Equals(object o). GetHashCode()"

The usage of reflection in Equals appears questionable, as others have stated. Let's ignore it and focus on GetHashCode....The main GetHashCode rule that you can't break is ...Two items must have the same hash code in order for them to be equal..... Or, ...Two items must be unequal if their hash codes disagree.... would be an equal method to state ...

Object reference not assigned to an instance of an object in MVC3 - Insert using ViewModel

I've previously run in situations like this. This occurs if the data coming from your view is not in a format that the MVC default model binding engine can read or one that can be translated to your view model object. See how the data is being delivered through POST by using "FireBug." then check to see whether the definition of your view model can...

DropDownList causes error: Object reference not set to an instance of an object

Verify that you have a list view....<InsertItemTemplate> .... <asp:DropDownList ID="DropDownList1" runat="server" /> .... ...In connection with...ListView1.InsertItem.FindControl("DropDownList1");

Mysql Connector always get Object reference not set to an instance of an object

It appears that you omitted the citation for...MySql.Data.Entity... If not for that, the...dll... won't function

Prevent EF from adding new child objects instead of just association when inserting new parent object?

Entities that have been disconnected and are reattached are by default in the Added state....After adding the workout, you can alter the state....public int CreateExercise(Exercise newExercise) { db.Exercises.Add(newExercise); // set all attached users to unchanged. db.ChangeTracker.Entries<User>().ToList().ForEach(p => p.State = Enti...

Entity Framework code first Object reference not set to an instance of an object

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How to check if an object is a child or a child of a child

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Object reference not set to an instance of an object - Multiple Projects (MVC)

I've written a ...update my blog... to explain what the problem means in detail and how to troubleshoot it because it's a typically perplexing mistake for novice devs. TL;DR:...Object reference not set to an instance of an object... is a runtime error that happens when you anticipate a variable to be an instance of a specific class but it resolves ...

How to use AutoMapper to map destination object with a child object in the source object?

It turns out that the OP's primary goal is to quickly map a child or nested item inside the source object to the flattened destination object after some conversation. He does not wish to plan out each attribute of the location....Here is how you can do it:...Create a mapping....Product... -> ...ProductViewModel... used to flatten the Product membe...

Entity Framework appears to be saving children objects before the parent object

Based on the navigation attributes, EF does determine the suitable order. There's still a problem. There might be a few issues....Why do you use...[DatabaseGenerated(DatabaseGeneratedOption.None)]... ? Or does the database create and maintain the ids? Don't you want the database if it is?...[DatabaseGenerated(DatabaseGeneratedOption.Identity)]... ?...