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CSVInputReader.cs
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CSVInputReader.cs
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using Microsoft.VisualBasic.FileIO;
using System.Data;
namespace FilterByTags
{
internal class CSVInputReader : IInputReader
{
public bool ReadFirstRowAsHeader { get; set; }
public CSVInputReader() { }
public DataTable Read(string file)
{
using var parser = new TextFieldParser(file)
{
HasFieldsEnclosedInQuotes = true,
Delimiters = new string[] { "," }
};
try
{
var table = new DataTable();
while (!parser.EndOfData)
{
var fields = parser.ReadFields() ?? new string[0];
if (table.Columns.Count == 0)
{
table.Columns.AddRange(fields
.Select((f, idx) => this.ReadFirstRowAsHeader ?
new DataColumn(f, typeof(string)) :
new DataColumn($"Col_{idx}", typeof(string)))
.ToArray());
if (this.ReadFirstRowAsHeader) continue;
}
var row = table.NewRow();
row.ItemArray = fields;
table.Rows.Add(row);
}
return table;
}
finally
{
parser.Close();
}
}
}
}