For Each In Vs For To

[RsOfT]

Tengo curiosidad por saber si existe alguna diferencia en performance entre estos 2 for en VB.NET:

Código vb:

Dim dsDataSet As New DataSet
 
'Caso 1
For Each dr As DataRow In dsDataSet.Tables(0).Rows
    '...
Next
 
'Caso 2
For i As Integer = 0 To dsDataSet.Tables(0).Rows.Count
    '...
Next
 

[posman]

No se si sirva de mucho

Collections

When you traverse a collection, you can use either a For loop or a For Each loop. If you expect to add, delete, or rearrange elements of the collection during the traversal, a For loop can produce more reliable results. It also allows you to determine the order of traversal. Furthermore, a collection derived from the CollectionBase class in the System.Collections namespace throws an exception if you attempt to change its members during a For Each loop.

A For Each loop gives control of the collection to the enumerator object returned by the IEnumerable.GetEnumerator method. This means that you cannot necessarily predict the order of traversal. For Each is useful when you are not able to access a collection's members using the Item property.

The performance difference between For and For Each loops does not appear to be significant.

http://msdn.microsoft.com/en-us/libr...perfoptanchor5

[RsOfT]

Gracias por la info.