如何在循环中构建Action动作？解释(对不起,太长了)
我有以下几点：
public interface ISomeInterface {
void MethodOne();
void MethodTwo(string folder);
}
public class SomeFinder : ISomeInterface
{ // elided
}
和一个使用上述的课程：
public Map Builder.BuildMap(Action<ISomeInterface> action,string usedByISomeInterfaceMethods)
{
var finder = new SomeFinder();
action(finder);
}
我可以用它们中的任何一个来称呼它,它的效果很好：
var builder = new Builder();
var map = builder.BuildMap(z => z.MethodOne(),"IAnInterfaceName");
var map2 = builder(z =>
{
z.MethodOne();
z.MethodTwo("relativeFolderName");
},"IAnotherInterfaceName");
如何以编程方式构建第二个实现？即,
List<string> folders = new { "folder1","folder2","folder3" };
folders.ForEach(folder =>
{
/* do something here to add current folder to an expression
so that at the end I end up with a single object that would
look like:
builder.BuildMap(z => {
z.MethodTwo("folder1");
z.MethodTwo("folder2");
z.MethodTwo("folder3");
},"IYetAnotherInterfaceName");
*/
});
我一直在想我需要一个
Expression<Action<ISomeInterface>> x
或类似的东西,但对于我的生活,我没有看到如何构造我想要的.任何想法都将不胜感激！
解决方法
这很简单,因为代理已经是多播了：
Action<ISomeInterface> action1 = z => z.MethodOne();
Action<ISomeInterface> action2 = z => z.MethodTwo("relativeFolderName");
builder.BuildMap(action1 + action2,"IAnotherInterfaceName");
或者如果您因为某些原因收集了它们：
IEnumerable<Action<ISomeInterface>> actions = GetActions();
Action<ISomeInterface> action = null;
foreach (Action<ISomeInterface> singleAction in actions)
{
action += singleAction;
}
甚至：
IEnumerable<Action<ISomeInterface>> actions = GetActions();
Action<ISomeInterface> action = (Action<ISomeInterface>)
Delegate.Combine(actions.ToArray());
