Wpf user control base class problem

inheritanceuser-controlswpf

I am new to WPF and have created a WPF User Control Library

I added a Base class that looks like this

public class TControl : UserControl
{
}

and want all of my controls to inherit from it.

I have a Control called Notification which looks like

public partial class Notification : TControl
{
    public Notification()
    {
        InitializeComponent();
    }

Works fine except when ever i recompile the hidden partial class where InitializeComponent() is defined gets regenerated and inherits from System.Windows.Controls.UserControl

this gives me an

Partial declarations of 'Twac.RealBoss.UserControls.Notification' must not specify different base classes

error,

is there anyway to force the generated class to inherit from my base class?

Best Answer

Your XAML file probably has:

<UserControl x:Class="YourNamespace.Notification" .... >

Try changing this to:

<Whatever:TControl x:Class="YourNamespace.Notification" xmlns:Whatever="clr-namespace:YourNamespace" />

The error you are getting is because the use of UserControl in the XAML tells the compiler to produce a partial class inheriting from UserControl, instead of inheriting from your class.

Related Solutions

C# – Calling the base constructor in C#

Modify your constructor to the following so that it calls the base class constructor properly:

public class MyExceptionClass : Exception
{
    public MyExceptionClass(string message, string extrainfo) : base(message)
    {
        //other stuff here
    }
}

Note that a constructor is not something that you can call anytime within a method. That's the reason you're getting errors in your call in the constructor body.

C# – How to a WPF UserControl inherit a WPF UserControl

Ensure that you have changed the first tag in the xaml to also inherit from your new basetype

<UserControl x:Class="TestDependencyProperty827.DataTypes.DataTypeWholeNumber"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"        
    xmlns:s="clr-namespace:System;assembly=mscorlib"
    >

becomes

<myTypes:BaseDataType x:Class="TestDependencyProperty827.DataTypes.DataTypeWholeNumber"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"        
    xmlns:s="clr-namespace:System;assembly=mscorlib"
    xmlns:myTypes="clr-namespace:TestDependencyProperty827.DataTypes"
    >

So, to summarise the complete answer including the extra details from the comments below:

The base class should not include a xaml file. Define it in a single (non-partial) cs file and define it to inherit directly from Usercontrol.
Ensure that the subclass inherits from the base class both in the cs code-behind file and in the first tag of the xaml (as shown above).

Best Answer

Related Solutions

C# – Calling the base constructor in C#

C# – How to a WPF UserControl inherit a WPF UserControl

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