问题:
You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application.
You write the following code fragment.
You need to implement the MyProject.AverageConverter class.
What should you do?()
A . Implement the IValueConverter interface.
B . Implement the IMultiValueConverter interface.
C . Inherit from the TypeConverter class.
D . Apply the TypeConverterAttribute attribute.
You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application.
You write the following code fragment.
You need to implement the MyProject.AverageConverter class.
What should you do?()
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