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並前往https://www.generacodice.com/en/articolo/1766485/Get-all-column-names-of-a-DataTable-into-string-array-using-(LINQPredicate)

Get all column names of a DataTable into string array using ...

Cast is required, because Columns is of type DataColumnCollection which is a IEnumerable , not IEnumerable<DataColumn> . The other parts should be obvious.

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