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    <p>I based this method off of a bunch of SO &amp; Google searches, and a by using reflector to see what MS did for the .NET 4 HasFlags method.</p> <pre><code>public static class EnumExt { /// &lt;summary&gt; /// Check to see if a flags enumeration has a specific flag set. /// &lt;/summary&gt; /// &lt;param name="variable"&gt;Flags enumeration to check&lt;/param&gt; /// &lt;param name="value"&gt;Flag to check for&lt;/param&gt; /// &lt;returns&gt;&lt;/returns&gt; public static bool HasFlag(this Enum variable, Enum value) { if (variable == null) return false; if (value == null) throw new ArgumentNullException("value"); // Not as good as the .NET 4 version of this function, but should be good enough if (!Enum.IsDefined(variable.GetType(), value)) { throw new ArgumentException(string.Format( "Enumeration type mismatch. The flag is of type '{0}', was expecting '{1}'.", value.GetType(), variable.GetType())); } ulong num = Convert.ToUInt64(value); return ((Convert.ToUInt64(variable) &amp; num) == num); } } </code></pre> <p>Notes:</p> <ul> <li>This handles nulls</li> <li>Does type checking</li> <li>Converts to a ulong, and can handle any positive enum value. <a href="http://msdn.microsoft.com/en-us/library/system.enum.aspx" rel="noreferrer">Microsoft cautions</a> against the use of negative flags enumerations anyway: <blockquote> <p>Use caution if you define a negative number as a flag enumerated constant because many flag positions might be set to 1, which might make your code confusing and encourage coding errors.</p> </blockquote></li> </ul>
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    1. POGeneric extension method to see if an enum contains a flag
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    1. POGeneric extension method to see if an enum contains a flag
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    1. COThis isn't generic, and casting something that uses a negative enum value might be dangerous. I would suggest throwing in a check:: `Type.GetTypeCode(variable.GetType()) == TypeCode.UInt64 ? Convert.ToUInt64(...) : Convert.ToInt64(...)` Yeah its double the work, but you're a lot safer.
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    2. COAgreed, not 'generic' as in it doesn't use generics. But it works on all reasonable flags enumerations. For a flags enumeration to work, all flags must have the same sign. And a negative flag would actually be setting 2 bits of the value. So while technically possible to have a negative flag, this method is only the beginning of the potential problems. It's possible that there are other enum functions that will break with negative values. Use of ulong is part of what I learned from reflecting the .NET 4 HasFlag function.
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