ASP.NET MVC：获取所有控制器 [英] ASP.NET MVC: Get all controllers

问题描述

是否有可能取得所有控制器到的ControllerFactory？结果
我想要做的就是在应用程序中所有控制器类型的列表，但以一致的方式。

Is it possible to get all controllers available to a ControllerFactory?
What I want to do is get a list of all controller types in application, but in a consistent way.

让所有的控制器我得到的是同样的那些默认的请求分辨率使用。

So that all controllers I get are the same ones default request resolution is using.

（实际的任务是找到所有的操作方法有一个给定的属性）。

(The actual task is to find all action methods that have a given attribute).

推荐答案

您可以使用反射来枚举所有类的组件，并仅过滤类继承自Controller类。

You can use reflection to enumerate all classes in an assembly, and filter only classes inherit from Controller class.

最好的参考就是 asp.net的MVC源$ C ​​$ C 。看一看的<一的实现href=\"http://aspnet.$c$cplex.com/sourcecontrol/changeset/view/23011?projectName=aspnet#266456\">ControllerTypeCache和<一个href=\"http://aspnet.$c$cplex.com/sourcecontrol/changeset/view/23011?projectName=aspnet#266437\">ActionMethodSelector类。
ControllerTypeCache演示了如何获取所有控制器类可用。

The best reference is asp.net mvc source code. Take a look of the implementations of ControllerTypeCache and ActionMethodSelector class. ControllerTypeCache shows how to get all controller classes available.

       internal static bool IsControllerType(Type t) {
            return
                t != null &&
                t.IsPublic &&
                t.Name.EndsWith("Controller", StringComparison.OrdinalIgnoreCase) &&
                !t.IsAbstract &&
                typeof(IController).IsAssignableFrom(t);
        }

 public void EnsureInitialized(IBuildManager buildManager) {
            if (_cache == null) {
                lock (_lockObj) {
                    if (_cache == null) {
                        List<Type> controllerTypes = GetAllControllerTypes(buildManager);
                        var groupedByName = controllerTypes.GroupBy(
                            t => t.Name.Substring(0, t.Name.Length - "Controller".Length),
                            StringComparer.OrdinalIgnoreCase);
                        _cache = groupedByName.ToDictionary(
                            g => g.Key,
                            g => g.ToLookup(t => t.Namespace ?? String.Empty, StringComparer.OrdinalIgnoreCase),
                            StringComparer.OrdinalIgnoreCase);
                    }
                }
            }
        }

和ActionMethodSelector说明如何检查如果一个方法所需的属性。

And ActionMethodSelector shows how to check if a method has desired attribute.

private static List<MethodInfo> RunSelectionFilters(ControllerContext controllerContext, List<MethodInfo> methodInfos) {
            // remove all methods which are opting out of this request
            // to opt out, at least one attribute defined on the method must return false

            List<MethodInfo> matchesWithSelectionAttributes = new List<MethodInfo>();
            List<MethodInfo> matchesWithoutSelectionAttributes = new List<MethodInfo>();

            foreach (MethodInfo methodInfo in methodInfos) {
                ActionMethodSelectorAttribute[] attrs = (ActionMethodSelectorAttribute[])methodInfo.GetCustomAttributes(typeof(ActionMethodSelectorAttribute), true /* inherit */);
                if (attrs.Length == 0) {
                    matchesWithoutSelectionAttributes.Add(methodInfo);
                }
                else if (attrs.All(attr => attr.IsValidForRequest(controllerContext, methodInfo))) {
                    matchesWithSelectionAttributes.Add(methodInfo);
                }
            }

            // if a matching action method had a selection attribute, consider it more specific than a matching action method
            // without a selection attribute
            return (matchesWithSelectionAttributes.Count > 0) ? matchesWithSelectionAttributes : matchesWithoutSelectionAttributes;
        }

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