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Enum.HasFlag Method

April 12, 2014

Determines whether one or more bit fields are set in the current instance.

Namespace:  System
Assembly:  mscorlib (in mscorlib.dll)
'Declaration
Public Function HasFlag ( _
	flag As Enum _
) As Boolean

Parameters

flag
Type: System.Enum
An enumeration value.

Return Value

Type: System.Boolean
true if the bit field or bit fields that are set in flag are also set in the current instance; otherwise, false.
ExceptionCondition
ArgumentException

flag is a different type than the current instance.

The HasFlag method returns the result of the following Boolean expression.

thisInstance And flag = flag 

If the underlying value of flag is zero, the method returns true. If this behavior is not desirable, you can use the Equals method to test for equality with zero and call HasFlag only if the underlying value of flag is non-zero, as the following example illustrates.

The HasFlag method is designed to be used with enumeration types that are marked with the FlagsAttribute attribute. For enumeration types that are not marked with the FlagsAttribute attribute, call either the Equals method or the CompareTo method.

The following example defines an ItemsOrdered enumeration that reflects categories of items that a customer can order in a restaurant. The example tests whether the customer has ordered both an entrée and a beverage.

Windows Phone OS

Supported in: 8.1, 8.0

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