WPF ToolTip does not update

Question

Assuming I have a simple class that represents a staff member

class Staff
{
    public string FirstName { get; set; }
    public string FamilyName { get; set         


        

Answer 1

It's worth noting that the ToolTip appears to check your object that it's bound to for equality before reloading itself with the new data.

In my case I did an override of

public override bool Equals(object obj) 

and

public override int GetHashCode()

on a class with properties

public class MultipleNameObject { string Name, string[] OtherNames};

Unfortunatley I only did a string.Compare() on the Name property of the MultipleNameObject for equality purposes. The tool tip was supposed to display OtherNames in a ItemsControl, but was not updating if Name was equal on the previous MultipleNameObject that the mouse hovered been over on the grid, even if the OtherNames were different.

[edit] Running with debug enabled confirms that the GetHashCode() override of my object was being used by the ToolTip to decide whether to grab the new data back. Fixing that to take the string[] OtherNames into account fixed the problem.