Using GCHandle with Enums

[Hexar Anderson]

Why can't you pin an enumeration? For example, the with the following code:

public enum MyEnum : byte
{
ValueOne = 1,
ValueTwo = 2
}

public class MyClass
{
public MyFunc()
{
MyEnum m = MyEnum.ValueOne ;
GCHandle myGch = GCHandle.Alloc( m, GCHandleType.Pi nned);
}
}

When you run MyFunc(), then a System.Argument Exception is thrown: "Object
contains non-primitive or non-blittable data." This seems quite odd to me;
if the underlying type of an enum is blittable (byte) then shouldn't the enum
itself be blittable too? How does one pin an enum then?

The second part of my question is, what's the best way to pin a 2D array of
enums, eg:

public MyFunc2()
{
MyEnum[,] array = new MyEnum[3, 3];
GCHandle h = GCHandle.Alloc( array[0,0], GCHandleType.Pi nned); // Same
exception
}

[Stelrad Doulton]

take a look at below:

http://msdn.microsoft.com/library/de...ingpinning.asp

"Hexar Anderson" <He***********@ discussions.mic rosoft.com> wrote in message
news:B1******** *************** ***********@mic rosoft.com...

Why can't you pin an enumeration? For example, the with the following
code:

public enum MyEnum : byte
{
ValueOne = 1,
ValueTwo = 2
}

public class MyClass
{
public MyFunc()
{
MyEnum m = MyEnum.ValueOne ;
GCHandle myGch = GCHandle.Alloc( m, GCHandleType.Pi nned);
}
}

When you run MyFunc(), then a System.Argument Exception is thrown: "Object
contains non-primitive or non-blittable data." This seems quite odd to
me;
if the underlying type of an enum is blittable (byte) then shouldn't the
enum
itself be blittable too? How does one pin an enum then?

The second part of my question is, what's the best way to pin a 2D array
of
enums, eg:

public MyFunc2()
{
MyEnum[,] array = new MyEnum[3, 3];
GCHandle h = GCHandle.Alloc( array[0,0], GCHandleType.Pi nned); // Same
exception
}