Undefined values: Difference between revisions
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This can't be used normally for value types (<code>int</code>, <code>double</code>, <code>DateTime</code>, etc.) since they are no ''references,'' so the following is a compiler error: |
This can't be used normally for value types (<code>int</code>, <code>double</code>, <code>DateTime</code>, etc.) since they are no ''references,'' so the following is a compiler error: |
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<lang csharp>int i = null;</ |
<lang csharp>int i = null;</lang> |
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With .NET 2.0 there is an additional <code>Nullable<T></code> structure which enables those semantics for value types as well: |
With .NET 2.0 there is an additional <code>Nullable<T></code> structure which enables those semantics for value types as well: |
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<lang csharp>int? answer = null; |
<lang csharp>int? answer = null; |
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