Canceling out of a delegate or IComparable

[superjodash]

Hi,

I am sorting a large List<FileInfo> using Sort(new MyComparable()). In
other areas, I'm using an anonymous delegate on a List<>.FindAll(...).

My question is this: How do you cancel out of these scenarios? For
instance, Sort calls the following

public class MyComparable() : IComparer<FileInfo> {
public virtual int Compare(FileInfo x, FileInfo y) {
// i want the cancel here
}
}

The problem is that the Sort method calls this function for each item.
Without throwing an exception, I can't seem to figure out how to stop
the sorting process. Granted, this is probably not a good idea since
it acts directly on the array. However, I still would like to know if
anyone knows how to do it.

Thanks,
John

 

[Jon Skeet [C# MVP]]

I am sorting a large List<FileInfo> using Sort(new MyComparable()). In
other areas, I'm using an anonymous delegate on a List<>.FindAll(...).

My question is this: How do you cancel out of these scenarios? For
instance, Sort calls the following

public class MyComparable() : IComparer<FileInfo> {
public virtual int Compare(FileInfo x, FileInfo y) {
// i want the cancel here
}
}

The problem is that the Sort method calls this function for each item.
Without throwing an exception, I can't seem to figure out how to stop
the sorting process. Granted, this is probably not a good idea since
it acts directly on the array. However, I still would like to know if
anyone knows how to do it.

You can't, basically.

You could write your own CancellableSort routine, which used a
different comparison delegate (or IComparer<T> equivalent) but included
a flag allowing the delegate to cancel - but that's the only option
aside from exceptions.

 

[Ignacio Machin \( .NET/ C# MVP \)]

Hi,

Hi,

I am sorting a large List<FileInfo> using Sort(new MyComparable()). In
other areas, I'm using an anonymous delegate on a List<>.FindAll(...).

My question is this: How do you cancel out of these scenarios? For
instance, Sort calls the following

You cannot, basically the List class is doing a loop (for FindAll) in the
collection and ntil it gets to the end it cannot be sure if FindAll will
really find all

I'm afraid than an exception is your only alternative, a dirty solution I
might add