Linq on TableCellCollection - C#

void foo (TableCellCollec开发者_运维百科tion bar)
{
  bar.Cast<TableCellCollection>().Where(a...
}

On the code above, the lambda 'a' is still a TableCellCollection rather than a TableCell, can anyone point out what I'm doing wrong? Thanks!

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Yes, you've told it that it should be TableCellCollection with your Cast call. If you want to cast each element to TableCell, that's the type argument you should give:

bar.Cast<TableCell>().Where(a...

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Further to Jon's answer your code would cause a cast exception at runtime. The Cast method works on IEnumerable collections not IEnumerable<t>. It would act as if you were doing the below:

IEnumerable EnumerableCells = bar;

foreach (object cell in EnumerableCells)
{
    TableCellCollection newCell = (TableCellCollection)cell;// this line would throw a cast exception
}

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I found this useful

var eta = e.Row.Cells;

eta.Cast<TableCell>().Where(a => a.Text == "Ind_Origen").Select(a => a.Text = "Origin").FirstOrDefault();

I use Linq to query the collection looking for a string and then change it. Its usefull if you are filling a gridview and want to change the headers.