NAnt属性:: exists()与新定义的属性?

时间:2013-03-01 22:44:51

标签: nant

在NAnt 0.92中,我定义了一个属性,并在检查后立即存在。它不存在......但它存在于被调用的目标中。这是一个错误还是一个功能?!?我在文档中搜索但没有找到它。

<target name="test">
  <property name="testprop" value="test value" />

  <echo message="property value = ${testprop}" />

  <if test="${property::exists(testprop)}">
     <echo message="property exists, as it should!" />
  </if>

  <if test="${not property::exists(testprop)}">
     <echo message="property doesn't exists... WTF?" />
  </if>

  <call target="test2" />
</target>

<target name="test2">
  <echo message="property value in sub-target = ${testprop}" />
</target>

输出:

试验:

 [echo] property value = test value
 [echo] property doesn't exists... WTF?

TEST2:

 [echo] property value in sub-target = test value

1 个答案:

答案 0 :(得分:5)

在致电property::exists时,需要引用该媒体资源的名称。所以就是这样:

<if test="${not property::exists('testprop')}">
  <echo message="property doesn't exists... WTF?" />
  <!-- don't swear -->
</if>

更新:您的示例中会发生什么?在您调用函数testprop时,不带引号的属性property::exists将替换为它的值。所以你实际上正在探测属性test value(BTW不是有效的属性名称)。看看这个:

<target name="test">
  <property name="test.value" value="foo" />
  <property name="testprop" value="test.value" />
  <echo message="property value = ${testprop}" />
  <if test="${property::exists(testprop)}">
    <echo message="property exists, as it should!" />
  </if>
  <if test="${not property::exists(testprop)}">
    <echo message="property doesn't exists... WTF?" />
  </if>
</target>

输出:

 [echo] property value = test.value
 [echo] property exists, as it should!