Yield and generics rock! - Tales from the Evil Empire
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Saved by 2 people (0 private), first by anonymouse user on 2008-05-14
- Tdonaghe on 2008-05-15 - Tags .net , yield , generics
- Bluecockatoo on 2008-05-14 - Tags C# , .Net , codesnippets , development , generics
Public Sticky notes
public sealed class FilteredEnumerable<T> : IEnumerable<T>, IEnumerable {
private IEnumerable<T> _enumerable;
private Predicate<T> _filter;
public FilteredEnumerable(IEnumerable<T> enumerable, Predicate<T> filter) : base() {
_enumerable = enumerable;
_filter = filter;
}
IEnumerator<T> IEnumerable<T>.GetEnumerator() {
foreach (T item in _enumerable) {
if (_filter == null || _filter(item)) {
yield return item;
}
}
}
IEnumerator IEnumerable.GetEnumerator() {
return (IEnumerator)(((IEnumerable<T>)this).GetEnumerator());
}
}
private IEnumerable<T> _enumerable;
private Predicate<T> _filter;
public FilteredEnumerable(IEnumerable<T> enumerable, Predicate<T> filter) : base() {
_enumerable = enumerable;
_filter = filter;
}
IEnumerator<T> IEnumerable<T>.GetEnumerator() {
foreach (T item in _enumerable) {
if (_filter == null || _filter(item)) {
yield return item;
}
}
}
IEnumerator IEnumerable.GetEnumerator() {
return (IEnumerator)(((IEnumerable<T>)this).GetEnumerator());
}
}
Highlighted by bluecockatoo
string[] stringsToFilter = new string[] {"Red", "Green", "Blue", "Pink"};
Predicate<string> filter = delegate(string stringToFilter) {
return (stringToFilter.IndexOf('e') != -1);
};
filteredStrings = new FilteredEnumerable<string>(stringsToFilter, filter);
Predicate<string> filter = delegate(string stringToFilter) {
return (stringToFilter.IndexOf('e') != -1);
};
filteredStrings = new FilteredEnumerable<string>(stringsToFilter, filter);
Highlighted by bluecockatoo
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