对口在C＃中的匿名接口实现 [英] Counterpart to anonymous interface implementations in C#

问题描述

我的工作从Java翻译一些代码，C＃，但我有一些麻烦，也许有人在那里可以帮助？

我有问题试图复制匿名。接口实现，被广泛应用于Java的，但不知道如何

一个例子是：

 列表<数据>队列1 =新的ArrayList<数据>（集）; 
 //排序的第一个提升的数据​​
 Collections.sort（队列1，新的比较<距离;数据>（）{
 @覆盖
公众诠释比较（数据DATA1，DATA数据2）{
双距离1 = distanceFunction.calculate（DATA1，promoted.first）; 
双距离2 = distanceFunction.calculate（数据2，promoted.first）; 
返回Double.compare（距离1，距离2）; 
} 
}）; 
  

解决方案

我想问题复制被广泛采用在Java中

这些都不是内联函数，这是实现特定接口的匿名类。

C＃提供的代表的，你可以定义内嵌或在一个单独的功能。

下面是排序的一个例子的列表<数据>使用代替比较< T> 委托：

 列表<数据>队列=新的List<数据>（）; 
 queue.Sort（
（左，右）= GT; {
双距离1 = distanceFunction.Calculate（左，promoted.first）; 
双距离2 = distanceFunction.Calculate（没错，promoted.first）; 
返回Double.Compare（距离1，距离2）; 
} 
）; 
  

请注意，为了使这项工作，在 distanceFunction 变量需要在范围在您调用 queue.Sort 的地方。它可以调用点以上定义的局部变量，或者类封闭，使调用函数的成员变量/属性。

I'm working on translating some code from Java to C# but am having some trouble, maybe someone out there can help?

I have problems trying to replicate anonymous interface implementations that are widely used in Java, but have no idea how to.

An example is:

List<DATA> queue1 = new ArrayList<DATA>(dataSet);
            // Sort by distance to the first promoted data
            Collections.sort(queue1, new Comparator<DATA>() {
                @Override
                public int compare(DATA data1, DATA data2) {
                    double distance1 = distanceFunction.calculate(data1, promoted.first);
                    double distance2 = distanceFunction.calculate(data2, promoted.first);
                    return Double.compare(distance1, distance2);
                }
            });

解决方案

I have problems trying to replicate the inline functions that are widely used in Java

These are not inline functions, that's anonymous classes implementing a specific interface.

C# provides delegates that you can define inline or in a separate function.

Here is an example of sorting a List<DATA> in place using the Comparison<T> delegate:

List<DATA> queue = new List<DATA>();
queue.Sort(
    (left, right) => {
        double distance1 = distanceFunction.Calculate(left, promoted.first);
        double distance2 = distanceFunction.Calculate(right, promoted.first);
        return Double.Compare(distance1, distance2);
    }
);

Note that in order for this to work, the distanceFunction variable needs to be in scope at the spot where you invoke queue.Sort. It can be a local variable defined above the invocation point, or a member variable/property of the class enclosing the function that makes the call.

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