小编Her*_*rks的帖子

我不明白container/heap包中的以下代码片段.

type Interface interface {
    sort.Interface   //Is this line a method?
    Push(x interface{})
    Pop() interface{}
}

我在代码后面实现了一个基本的数据绑定,这是代码:

Binding bindingSlider = new Binding();
bindingSlider.Source = mediaElement.Position;
bindingSlider.Mode = BindingMode.TwoWay;            
bindingSlider.Converter = (IValueConverter)Application.Current.Resources["DoubleTimeSpan"];            
slider.SetBinding(Slider.ValueProperty, bindingSlider);

这是转换器的代码,

class DoubleTimeSpan : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter,
string language)
    {
        return ((TimeSpan)value).TotalSeconds;
    }

    public object ConvertBack(object value, Type targetType, object parameter,
string language)
    {           
        return TimeSpan.FromSeconds((double)value);
    }
}

即使我没有收到编译器的错误消息,但绑定代码不起作用.为什么？

我不太清楚这段代码片段的行为.

func show(i interface{}) {
    switch t := i.(type) {
    case *Person:
      t := reflect.TypeOf(i)  //what t contains?   
      v := reflect.ValueOf(i)  //what v contains?
      tag := t.Elem().Field(0).Tag
      name := v.Elem().Field(0).String() 
    }
}

反射中的类型和值有什么区别？

lein repl当我进入项目根文件夹时，我收到错误消息。我尝试删除主文件夹中的 .lein 目录并重新下载 lein，但它对我不起作用。

可能重复： 使用 leiningen 时出现 ExceptionInInitializerError

Exception in thread "Thread-1" java.util.zip.ZipException: zip file is empty
at java.util.zip.ZipFile.open(Native Method)
at java.util.zip.ZipFile.<init>(ZipFile.java:214)
at java.util.zip.ZipFile.<init>(ZipFile.java:144)
at java.util.jar.JarFile.<init>(JarFile.java:153)
at java.util.jar.JarFile.<init>(JarFile.java:117)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
at clojure.lang.Reflector.invokeConstructor(Reflector.java:180)
at leiningen.core.classpath$extract_native_deps.invoke(classpath.clj:43)
at clojure.lang.AFn.applyToHelper(AFn.java:167)
at clojure.lang.AFn.applyTo(AFn.java:151)
at clojure.core$apply.invoke(core.clj:617)
at leiningen.core.classpath$when_stale.doInvoke(classpath.clj:66)
at clojure.lang.RestFn.invoke(RestFn.java:580)
at leiningen.core.classpath$resolve_dependencies.doInvoke(classpath.clj:231)
at clojure.lang.RestFn.invoke(RestFn.java:425)
at leiningen.core.eval$prep.invoke(eval.clj:54)
at leiningen.core.eval$eval_in_project.invoke(eval.clj:282)
at leiningen.repl$start_server.invoke(repl.clj:117)
at leiningen.repl$server$fn__6110.invoke(repl.clj:173)
at clojure.lang.AFn.applyToHelper(AFn.java:159)
at clojure.lang.AFn.applyTo(AFn.java:151)
at clojure.core$apply.invoke(core.clj:617)
at clojure.core$with_bindings_STAR_.doInvoke(core.clj:1788)
at clojure.lang.RestFn.invoke(RestFn.java:425)
at clojure.lang.AFn.applyToHelper(AFn.java:163)
at clojure.lang.RestFn.applyTo(RestFn.java:132) …