How to

如何实现循环中移除集合项

//you can work around the limitation by creating a new collection dynamically to hold the enumerated collection. 
foreach (string s in new System.Collections.ArrayList(arr)) //for read
            {
                arr.Remove(s); //for write
            }

生成唯一序列

Enumerable.Range(1, 100).OrderBy(x => rnd.Next())

获取程序集中特定接口的所有实例

return AppDomain.CurrentDomain.GetAssemblies().SelectMany(a => a.GetTypes().Where(t => t.GetInterfaces().Contains(typeof(IModuleInit))));