CODEWITHSUNDEEP
c#winforms
tony b
tony b

Reputation: 1351

"Use the new keyword if hiding was intended" warning

I have a warning at the bottom of my screen:

Warning 1 'WindowsFormsApplication2.EventControlDataSet.Events' hides inherited member 'System.ComponentModel.MarshalByValueComponent.Events'. Use the new keyword if hiding was intended. C:\Users\myComputer\Desktop\Event Control\WindowsFormsApplication2\EventControlDataSet.Designer.cs 112 32 eventControl

If i double click on it, it comes up with:

public EventsDataTable Events {
    get {
        return this.tableEvents;
    }

Can anyone tell me how to get rid of this?

Upvotes: 122

Views: 154767

Answers (5)

The Doctor
The Doctor

Reputation: 693

this warning also triggers when you have:
x:Name="Name1" with Text="{Binding Name1}" the Same Property Name in same Element in your <Xaml>
which can cause a serious conflict at a certain point when your binding process become more complex.

Upvotes: 1

James L.
James L.

Reputation: 14525

The parent function needs the virtual keyword, and the child function needs the override keyword in front of the function definition.

Upvotes: 2

Joee
Joee

Reputation: 2016

In the code below, Class A implements the interface IShow and implements its method ShowData. Class B inherits Class A. In order to use ShowData method in Class B, we have to use keyword new in the ShowData method in order to hide the base class Class A method and use override keyword in order to extend the method. 

interface IShow
{
    protected void ShowData();
}

class A : IShow
{
    protected void ShowData()
    {
        Console.WriteLine("This is Class A");
    }
}

class B : A
{
    protected new void ShowData()
    {
        Console.WriteLine("This is Class B");
    }
}

Upvotes: 10

Aggressor
Aggressor

Reputation: 13551

@wdavo is correct. The same is also true for functions.

If you override a base function, like Update, then in your subclass you need:

new void Update()
{
  //do stufff
}

Without the new at the start of the function decleration you will get the warning flag.

Upvotes: 13

wdavo
wdavo

Reputation: 5110

Your class has a base class, and this base class also has a property (which is not virtual or abstract) called Events which is being overridden by your class. If you intend to override it put the "new" keyword after the public modifier. E.G.

public new EventsDataTable Events
{
  ..
}

If you don't wish to override it change your properties' name to something else.

Upvotes: 172

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