Create Exception with a custom constructor in C#

Question

I'd like to create a custom exception with a constructor taking some context and building its message itself. In Java, that would look like (see how to create custom exception with a number in constructor in Java)

public MyException(String message, IContext context){
    super(message + " " + context.someData);
}

In C# however, the compiler tells me that base() is not valid in this context.

public MyException(IContext context)
{
    base(String.Format("Context is: {0}", context));
}

What's wrong?

Answer 1

The C# syntax is:

public MyException(IContext context)
    : base(String.Format("Context is: {0}", context))
{
}