Lambda in a attribute parameter

Question

Why can't we add a lambda as attribute parameter? For example I would like to do:

[MyAttribut(Transform= {object => object.ToSomethingElse()})]

Should I understand that lambda in C# are only closure?

EDIT: By looking at all answer let me precise one things that most people seems to not know: Lambda are literal whish is a compile time structure unless it is a closure.

Answer 1

Parameters to attributes need to be compile time constants.

From MSDN - Attribute Parameter Types:

Values passed to attributes must be known to the compiler at compile time.

They are also restricted to these types:

• bool
• char, unsigned char
• short, unsigned short
• int, unsigned int
• long, unsigned long
• __int64, unsigned __int64
• float, double
• wchar_t
• char* or wchar_t* or System::String*
• System::Type ^
• System::Object ^
• enum