StackOverflow2013

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primarykey
Id
5807434
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
4
CommunityOwnedDate
CreationDate
2011-04-27T16:31:44
FavoriteCount
0
LastActivityDate
2011-06-16T06:46:01.700
LastEditDate
2011-06-16T06:46:01.700
LastEditorUserId
702199
OwnerUserId
702199
ParentId
5806898
PostTypeId
2
Score
6
ViewCount
0
LastEditorDisplayName
text
Body
Well, let's use the trick ... What do we know? <ul> <li>Value-type variable gets boxed again and again when assigned into reference-type variable</li> <li>Reference-type variable will not get boxed again ...</li> </ul> So we will just check whether it gets boxed again (into another object) ... so we compare references <code>isReferenceType</code> will be false here, because we compare 2 objects on heap (one boxed in <code>surelyBoxed</code>, one boxed just in call to ReferenceEquals): <pre><code>int checkedVariable = 123; //any type of variable can be used here object surelyBoxed = checkedVariable; bool isReferenceType = object.ReferenceEquals(surelyBoxed, checkedVariable); </code></pre> <code>isReferenceType</code> will be true here, because we compare 1 object on heap to itself: <pre><code>object checkedVariable = 123; //any type of variable can be used here object surelyBoxed = checkedVariable; bool isReferenceType = object.ReferenceEquals(surelyBoxed, checkedVariable); </code></pre> This works for ANY type, not just for <code>int</code> and <code>object</code> To put it into well-usable method: <pre><code> public static bool IsReferenceType<T>(T input) { object surelyBoxed = input; return object.ReferenceEquals(surelyBoxed, input); } </code></pre> This method can be easily used like this: <pre><code>int i1 = 123; object o1 = 123; //... bool i1Referential = IsReferenceType(i1); //returns false bool o1Referential = IsReferenceType(o1); //returns true </code></pre>
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1. POHow to test whether a value is boxed in C# / .NET?
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1. USThetam
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