Parameters

Attribute	Type	Description	Required
name	string	The name of the NAnt property to set.	True
value	string	The value to assign to the NAnt property.	True
dynamic	bool	Specifies whether references to other properties should not be expanded when the value of the property is set, but expanded when the property is actually used. By default, properties will be expanded when set.	False
overwrite	bool	Specifies whether the value of a property should be overwritten if the property already exists (unless the property is read-only). The default is `true`.	False
readonly	bool	Specifies whether the property is read-only or not. The default is `false`.	False
failonerror	bool	Determines if task failure stops the build, or is just reported. The default is `true`.	False
if	bool	If `true` then the task will be executed; otherwise, skipped. The default is `true`.	False
unless	bool	Opposite of `NAnt.Core.Task.IfDefined`. If `false` then the task will be executed; otherwise, skipped. The default is `false`.	False
verbose	bool	Determines whether the task should report detailed build log messages. The default is `false`.	False

Examples

Define a debug property with value true.

<property name="debug" value="true" />

Use the user-defined debug property.

<property name="trace" value="${debug}" />

Define a read-only property. This is just like passing in the param on the command line.

<property name="do_not_touch_ME" value="hammer" readonly="true" />

Define a property, but do not overwrite the value if the property already exists (eg. it was specified on the command line).

    <project name="property-example">
  <property name="debug" value="true" overwrite="false" />
  <echo message="debug: ${debug}" />
</project>

Executing this build file with the command line option -D:debug=false, would cause the value specified on the command line to remain unaltered.

[echo] debug: false