public static T SearchTree <T>(Tree <T> tree, Func <T, bool> searchFunction)
{
// create the cancellation token source
CancellationTokenSource tokenSource = new CancellationTokenSource();
// search the tree
TWrapper <T> result = performSearch(tree, searchFunction, tokenSource);
return(result == null ? default(T) : result.Value);
}
private static TWrapper <T> PerformSearch <T>(
Tree <T> tree,
Func <T, bool> searchFunction,
CancellationTokenSource tokenSource)
{
// Define the result
TWrapper <T> result = null;
// Only proceed if we have something to search
if (tree != null)
{
// Apply the search function to the current tree
if (searchFunction(tree.Data))
{
// Cancel the token source
tokenSource.Cancel();
// Set the result
result = new TWrapper <T> {
Value = tree.Data
};
}
else
{
// We have not found a result - continue the search
if (tree.LeftNode != null && tree.RightNode != null)
{
// Start the task for the left node
Task <TWrapper <T> > leftTask = Task <TWrapper <T> > .Factory.StartNew(
() => PerformSearch(tree.LeftNode, searchFunction, tokenSource),
tokenSource.Token);
// Start the task for the right node
Task <TWrapper <T> > rightTask = Task <TWrapper <T> > .Factory.StartNew(
() => PerformSearch(tree.RightNode, searchFunction, tokenSource),
tokenSource.Token);
try
{
// Set the result based on the tasks
result = leftTask.Result != null
? leftTask.Result
: rightTask != null
? rightTask.Result
: null;
}
catch (AggregateException) { }
}
}
}
// Return the result
return(result);
}