We found some strange behavior connected with custom attributes.
Given this attribute:
public class MyAttribute : Attribute
{
public MyAttribute(bool b = false, params int[] a)
{
}
}
And this usage:
class Program
{
[MyAttribute]
static void Main()
{
Console.ReadKey();
}
}
We get the exception:
System.Reflection.CustomAttributeFormatException: Binary format of the specified custom attribute was invalid.
Why does this happen?
Not sure exactly what the cause is; in my own testing, it seems to be related to a combination of having one or more defaulted parameters and a "params" argument in the constructor definition. However, if it's holding you up, there's a lazy workaround:
public class MyAttribute : Attribute
{
public MyAttribute(params int[] a) : this(false) {}
public MyAttribute(bool b, params int[] a)
{
}
}
A "params" argument with a non-defaulted value and a "params" argument alone both appear to be fine.
Not exactly an explanation, but eh...
