System.Reflection.Metadata.PrimitiveTypeCode
enum PrimitiveTypeCode
Boolean = 2
Byte = 5
Char = 3
Double = 13
Int16 = 6
Int32 = 8
Int64 = 10
IntPtr = 24
Object = 28
SByte = 4
Single = 12
String = 14
TypedReference = 22
UInt16 = 7
UInt32 = 9
UInt64 = 11
UIntPtr = 25
Void = 1