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The sizeof Keyword

The final unsafe-centric C# keyword to consider is sizeof. As in C(++), the C# sizeof keyword is

used to obtain the size in bytes for a value type (never a reference type), and it may only be used

within an unsafe context. As you may imagine, this ability may prove helpful when you’re interact-

ing with unmanaged C-based APIs. Its usage is straightforward:

unsafe static void UseSizeOfOperator()

{

Console.WriteLine("The size of short is {0}.", sizeof(short));

Console.WriteLine("The size of int is {0}.", sizeof(int));

Console.WriteLine("The size of long is {0}.", sizeof(long));

}

As sizeof will evaluate the number of bytes for any System.ValueType-derived entity, you are

able to obtain the size of custom structures as well. For example, we could pass the Point structure

into sizeof as follows:

unsafe static void UseSizeOfOperator()

{

...

Console.WriteLine("The size of Point is {0}.", sizeof(Point));

}