梯度错误 "Cannot convert the provided notation to a File or URI"

Question

我在 gradle.properties 中定义了两个系统属性:

systemProp.buildDir=build
systemProp.cfgDir=build\\cfg

我在 build.gradle 中定义了以下任务:

task clean(group:'clean',description:'clean the project') << {
    ant.sequential {
        delete(dir: System.properties.buildDir)
        mkdir(dir: System.properties.buildDir)
        delete(dir: System.properties.cfgDir)
        mkdir(dir: System.properties.cfgDir)
    }
}

这会产生以下错误:

Execution failed for task ':clean'.
> Cannot convert the provided notation to a File or URI: {dir=build}.
  The following types/formats are supported:
    - A String or CharSequence path, e.g 'src/main/java' or '/usr/include'
    - A String or CharSequence URI, e.g 'file:/usr/include'
    - A File instance.
    - A URI or URL instance.

但是这个等效的代码块不会产生任何错误并且可以按预期工作:

task clean(group:'clean',description:'clean the project') << {
    ant.delete(dir: System.properties.buildDir)
    ant.mkdir(dir: System.properties.buildDir)
    ant.delete(dir: System.properties.cfgDir)
    ant.mkdir(dir: System.properties.cfgDir)
}

第一个语法的错误是 gradle 中的错误，还是我遗漏了什么？

Answer 1

此错误是由于您的 Gradle 构建脚本委托(delegate)给 Project 的实例而引起的。接口(interface)，它还有一个方法叫做 delete ，其参数由 Project.file() 评估.如果您想使用 Ant 任务，您必须使用 ant 对其进行限定。字首。