NAnt SDK Documentation - v0.92 |

# EnvironmentFunctions.VariableExists Method

Gets a value indicating whether the specified environment variable exists.

[Visual Basic]
<Function(Name:="variable-exists")>
Public Shared Function VariableExists( _
ByVal name As String _
) As Boolean
[C#]
[Function(Name="variable-exists")]
public static bool VariableExists(
string name
);

#### Parameters

name
  The environment variable that should be checked.

#### Return Value

true if the environment variable exists; otherwise, false.

#### Example

Execute a set of tasks only if the "BUILD_DEBUG" environment variable is set.

    <if test="${environment::variable-exists('BUILD_DEBUG')}">
        ...
    </if>

#### See Also

EnvironmentFunctions Class | NAnt.Core.Functions Namespace