foreach (TargetObject innerObject1 in complexObject.InnerObjects) {
foreach (TargetObject innerObject2 in innerObject1.InnerObjects) {
foreach (TargetObject innerObject3 in innerObject2.InnerObjects) {
yield return innerObject3;
}
yield return innerObject2;
}
yield return innerObject1;
}
我怎么能这么做呢？我需要将这些嵌套列表中捕获的TargetObject的所有实例聚合到一个列表中.这是一次无效的尝试.
public static IEnumerable<TargetObject> GetRecursively(params TargetObject[] startingObjects)
{
foreach (TargetObject startingObject in startingObjects)
{
foreach (TargetObject innerObject in GetRecursively(startingObject.InnerObjects.ToArray()))
{
yield return innerObject;
}
yield return startingObject;
}
}
解决方法
像这样 – 产生startingObject,并为InnerObjects中的每个项递归调用：
public static IEnumerable<TargetObject> GetRecursively(TargetObject startingObject)
{
yield return startingObject;
if (startingObject.InnerObjects != null)
foreach (TargetObject innerObject in startingObject.InnerObjects.ToArray())
foreach (TargetObject recursiveInner in GetRecursively(innerObject))
yield return recursiveInner;
}
要支持数组作为参数,请围绕它包装foreach：
public static IEnumerable<TargetObject> GetRecursively2(params TargetObject[] startingObjects)
{
foreach (TargetObject startingObject in startingObjects)
{
yield return startingObject;
if (startingObject.InnerObjects != null)
foreach (TargetObject innerObject in startingObject.InnerObjects.ToArray())
foreach (TargetObject recursiveInner in GetRecursively(innerObject))
yield return recursiveInner;
}
}
