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Possible Duplicate:
what does |= (single pipe equal) and &=(single ampersand equal) mean in c# (csharp)
这里是它被使用的上下文:
long dirtyFlag = 0x0000;
if (erd.SupervisorCompType != orgErd.SupervisorCompType) // change has been made?
{
dirtyFlag |= 0x0001;
// etc...
}