Indicates the number of elements in the fixed-length array or the number of characters (not bytes) in a string to import.
This field is required for the UnmanagedType.ByValArray and UnmanagedType.ByValTStr members of the System.Runtime.InteropServices.UnmanagedType enumeration. Because the compressed format of the metadata is limited to 0x1FFFFFFF, the range of allowed values for MarshalAsAttribute.SizeConst are (>= 0 and <= 0x1FFFFFFF).
For additional information, see [<topic://cpcondefaultmarshalingforarrays>].