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20 May 08

Linq: The Missing ToDictionary Extension Method Overload - Omer van Kloeten's .NET Zen

An extension method for getting a generic dictionary back from a collection of KeyValuePairs... just a bit of a shortcut from using the overload with two params, but handy.

weblogs.asp.net/...6121417.aspx - Preview

generics C# .Net codesnippets

public static Dictionary<TKey, TValue> ToDictionary<TKey, TValue>(this IEnumerable<KeyValuePair<TKey, TValue>> enumeration)
{
// Check to see that enumeration is not null
if (enumeration == null)
throw new ArgumentNullException("enumeration");

return enumeration.ToDictionary(item => item.Key, item => item.Value);
}

14 May 08

Yield and generics rock! - Tales from the Evil Empire

How to create a filter for generic lists (or other IEnumerable objects) without creating a temporary list first. Illustrates how to use the yield statement as well and create your own generic enumerator.

weblogs.asp.net/...223531.aspx - Preview

C# .Net codesnippets development generics

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());
}
}
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);