Convert type `System.Collections.IEnumerator` to `System.Collections.Generic.IEnumerator`

Question

I have the following code:

// row is a DatGridViewRow object
IEnumerator<DataGridCell> cells = row.Cells.GetEnumerator();

I get compile errors specifying that I

cannot implicitly convert type System.Collections.IEnumerator to System.Collections.Generic.IEnumerator

and that I need to do an explicit cast. When I try doing that via.

IEnumerator<DataGridCell> cells = (IEnumerator<DataGridCell>)row.Cells.GetEnumerator();

I get a run-time error.

Any ideas?

Perhaps this will help: http://stackoverflow.com/questions/828342/what-is-the-best-way-to-convert-an-ienumerator-to-a-generic-ienumerator — Darren Wainwright, Oct 11 '16 at 19:37

Gilad Green · Accepted Answer · 2016-10-11T19:51:08.727

6

This row.Cells.GetEnumerator() returns an IEnumerator but you are trying to assign it to an IEnumerator<DataGridViewCell> which can't be done and you get an exception. Adding (IEnumerator<DataGridCell>) in front of it won't help because still it is a different type.

To achieve that use .Cast before:

IEnumerator<DataGridCell> cells = row.Cells.Cast<DataGridViewCell>().GetEnumerator();

IMO a better option is to use IEnumerable<DataGridCell>:

IEnumerable<DataGridCell> cells = row.Cells.Cast<DataGridViewCell>();

edited Oct 11 '16 at 19:51

answered Oct 11 '16 at 19:34

Gilad Green

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Downvoter please explain – Gilad Green Oct 11 '16 at 19:39
I didn't downvote you, but OP said he wants `IEnumerator`, not `IEnumerable`. It's fair to ask him if he's sure that's really what's right for him, but you can't just say "here's something else, good luck". – 15ee8f99-57ff-4f92-890c-b56153 Oct 11 '16 at 19:43
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@EdPlunkett - Ya :) just saw my mistake and corrected :) – Gilad Green Oct 11 '16 at 19:43
@Lawrence Vo - Did this help you solve your problem? – Gilad Green Oct 11 '16 at 21:25
@GiladGreen yes it did, thanks! – Lawrence Vo Oct 12 '16 at 14:47
@LawrenceVo - Awesome :) Please consider marking question as solved by this answer – Gilad Green Oct 12 '16 at 14:48

score 2 · Answer 2 · answered Oct 11 '16 at 19:40

2

Try using the cast operator first.

IEnumerator<DataGridCell> cells = row.Cells.Cast<DataGridCell>().GetEnumerator();

answered Oct 11 '16 at 19:40

Cheick

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15ee8f99-57ff-4f92-890c-b56153 · Answer 3 · 2016-10-11T19:45:12.633

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IEnumerator<DataGridCell> cells = row.Cells.Cast<DataGridCell>().GetEnumerator();

For those following along at home:

var able = (IEnumerable)new List<String>();

IEnumerator<String> tor = able.Cast<String>().GetEnumerator();

Beats me why OP wants IEnumerator rather than IEnumerable (in fact I suspect he might be better off with the latter), but that's the question he asked.

edited Oct 11 '16 at 19:45

answered Oct 11 '16 at 19:40

15ee8f99-57ff-4f92-890c-b56153

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Thanks for correcting me :) – Gilad Green Oct 11 '16 at 19:44
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@GiladGreen My pleasure! – 15ee8f99-57ff-4f92-890c-b56153 Oct 11 '16 at 19:44

Convert type `System.Collections.IEnumerator` to `System.Collections.Generic.IEnumerator`

3 Answers3