public static int?FindFirstIndex(this TextRow row, Func <string, bool> predicate)
{
for (var i = 0; i < row.Count; i++)
{
if (predicate(row[i]))
{
return(i);
}
}
return(null);
}
// Method to find index of fields matching a condition
public static IEnumerable <int> FindIndex(this TextRow row, Func <string, bool> predicate) =>
row.Find((s, i) => predicate(s) is bool matched && matched
// Methods that get the index of first match; otherwise return null
public static int?FindFirstIndex(this TextRow row, string sought) =>
row.FindFirstIndex(sought, StringComparison.Ordinal);
public static int?FindFirstIndex(this TextRow row,
string sought, StringComparison comparison) =>
row.FindFirstIndex(s => string.Equals(s, sought, comparison));
public static int GetFirstIndex(this TextRow row, Func <string, bool> predicate) =>
row.FindFirstIndex(predicate) is int i ? i : throw new InvalidOperationException("Sequence contains no elements.");