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Posted on 2/1/2024 8:26:18 PM | | | |
introduction

The for and foreach loops are one of the most useful constructs in the C# developer toolbox.
In my opinion, iterating over a collection is more convenient than in most cases.
It works with all collection types, including non-indexable ones (such as , and do not require access to the current element through the index).
But sometimes, an index of the current item is really needed; I ran into this problem some time ago when I used foreach to traverse collections in development. This typically uses one of the following patterns:


It has always annoyed me; Can't we get both values and indexes?
There is a simple solution with Linq and tuples.

Solution 1:

Just write an extension method like this:

Please introduce the above code into the following namespace:

Calling method:

Note: Behind the collectionWithIndex()；

Solution 2:

If you find the extension method cumbersome, you can also use Solution 2

It's done, it has a little impact on performance, you can observe the use on demand!!





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 Landlord| Posted on 2/24/2024 5:00:44 PM |
.NET 9 pair collectionsAdded the Index extension method, you can get the index directly, refer to:The hyperlink login is visible.

public static System.Collections.Generic.IEnumerable<(int Index, TSource Item)> Index<TSource> (this System.Collections.Generic.IEnumerable<TSource> source);

Download the VS 2022 preview at:The hyperlink login is visible.

.NET 9.0 Preview Download:The hyperlink login is visible.

Create a new .NET 9 console app with the following code:







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