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OfTypeEnumerable.cs
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82 lines (72 loc) · 2.02 KB
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using System;
using System.Collections;
using System.Collections.Generic;
using Microsoft.CSharp.RuntimeBinder;
namespace Simple.Data
{
class OfTypeEnumerable<T> : IEnumerable<T>
{
private readonly IEnumerable<dynamic> _source;
public OfTypeEnumerable(IEnumerable<dynamic> source)
{
_source = source;
}
class CastEnumerator : IEnumerator<T>
{
private readonly IEnumerator<dynamic> _source;
public CastEnumerator(IEnumerator<dynamic> source)
{
_source = source;
}
public T Current {
get {
return _source.Current;
}
}
public bool MoveNext ()
{
bool next;
while (next = _source.MoveNext())
{
try
{
T cast = _source.Current;
break;
}
catch (InvalidCastException)
{
}
catch (RuntimeBinderException)
{
}
}
return next;
}
public void Reset ()
{
_source.Reset();
}
object IEnumerator.Current {
get {
return Current;
}
}
public void Dispose ()
{
_source.Dispose();
}
}
#region IEnumerable[T] implementation
public IEnumerator<T> GetEnumerator ()
{
return new CastEnumerator(_source.GetEnumerator());
}
#endregion
#region IEnumerable implementation
IEnumerator IEnumerable.GetEnumerator ()
{
return GetEnumerator();
}
#endregion
}
}