public override int GetHashCode()
{
return(TypeId.GetHashCode() +
FieldOffset.GetHashCode() +
Index.GetHashCode() +
OwningType.GetHashCode());
}
public static int OffsetOf <TStruct, TField>(
this TStruct @struct, Expression <Func <TStruct, TField> > expression, FieldOffset offset = FieldOffset.Begin)
where TStruct : struct
{
var memberExpression = expression.Body as MemberExpression;
if (memberExpression == null)
{
throw new ArgumentOutOfRangeException(nameof(expression));
}
var fieldInfo = memberExpression.Member as FieldInfo;
if (fieldInfo == null)
{
throw new ArgumentOutOfRangeException(nameof(expression));
}
var offset1 = Marshal.OffsetOf <TStruct>(fieldInfo.Name);
var offset2 = offset1.ToInt32();
switch (offset)
{
case FieldOffset.Begin:
return(offset2);
case FieldOffset.End:
return(offset2 + Marshal.SizeOf(fieldInfo.FieldType));
default:
throw new ArgumentOutOfRangeException(nameof(offset), offset, null);
}
}
