问题
If I have a Class like below. How do i traverse through it until its property SomeObjects.count = 0
public class SomeObject
{
public String Name { get; set; }
public List<SomeObject> SomeObjects { get; set; }
}
Many Thanks
回答1:
Here is a generic example of how you can traverse a composite object:
public static class TraversalHelper{
public static void TraverseAndExecute<T>(this T composite, Func<T,IEnumerable<T>> selectChildren, Action<T> action)
where T: class
{
action.Invoke(composite);
composite.TraverseAndExecute(selectChildren, action, new List<T>{ composite });
}
private static void TraverseAndExecute<T>(this T composite, Func<T,IEnumerable<T>> selectChildren, Action<T> action, IList<T> invokedComponents)
where T: class
{
invokedComponents = invokedComponents ?? new List<T>();
var components = selectChildren(composite) ?? new T[]{};
foreach(var component in components){
// To avoid an infinite loop in the case of circular references, ensure
// that you don't loop over an object that has already been traversed
if(!invokedComponents.Contains(component)){
action.Invoke(component);
invokedComponents.Add(component);
component.TraverseAndExecute<T>(selectChildren, action, invokedComponents);
}
else{
// the code to execute in the event of a circular reference
// would go here
}
}
}
}
Here is a sample usage:
public class Program{
public static void Main(){
var someObject = new SomeObject {
Name = "Composite",
SomeObjects = new List<SomeObject>{
new SomeObject{ Name = "Leaf 1" },
new SomeObject{
Name = "Nested Composite",
SomeObjects = new List<SomeObject>{ new SomeObject{Name = "Deep Leaf" }}
}
}
};
someObject.TraverseAndExecute(
x => x.SomeObjects,
x => { Console.WriteLine("Name: " + x.Name); }
);
}
}
回答2:
This is a tree-like structure; there are many algorithms for traversing it, you can search for tree-traversal algorithms and you'll find many of them.
来源:https://stackoverflow.com/questions/6501096/traverse-hierarchy-object-c-sharp