Assigning a negative hexadecimal literal value as a long

In VB, the following assignments below have negative values:

Dim a As Long = &HEFCDAB89
Dim b As Long = &H98BADCFE

Assigning the same hexadecimal values in C# does not result in the same values:

long a = 0xEFCDAB89;
long b = 0x98BAD开发者_StackOverflowCFE;

How can I assign negative hexadecimal values in C# as it is in VB?

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Use the L and UL literals:

long b = 0xEFCDAB89L; //signed long
long c = (long)0x98BADCFEUL; //unsigned long

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I don't know of any tricks to tell the compiler that you want to specify a negative hex literal, I'm not sure that's really possible. I believe your only option is to cast the ulong literal to a long. It will have to be done in an unchecked context. It is still a value known at compile time so no actual casting code will be generated.

long value = unchecked((long)0xFFFFFFFFFFFFFFFE);
// value == -2L

Note that in VB, &HEFCDAB89 and &H98BADCFE are actually Integer literals. They just happened to be promoted to a Long. To specify a Long literal, you must include the suffix L. So you assignments would have to be:

Dim a As Long = &HFFFFFFFFEFCDAB89L ' these are actually long literals now
Dim b As Long = &HFFFFFFFF98BADCFEL