将数据写入CSV文件

Question

Hi guys i'd like to write random double into a csv file ,for now am inserting string into the row, here is what i've done.How can alter my code in order to write doubles instead of string Many thanks in advance

public class CsvRow : List<string>
{
    public string LineText { get; set; }
}
/// <summary>
/// Class to write data to a CSV file
/// </summary>
public class CsvFileWriter : StreamWriter
{
    public CsvFileWriter(Stream stream)
        : base(stream)
    {
    }

    public CsvFileWriter(string filename)
        : base(filename)
    {
    }
    /// <summary>
    /// Writes a single row to a CSV file.
    /// </summary>
    /// <param name="row">The row to be written</param>
    public void WriteRow(CsvRow row)
    {
        StringBuilder builder = new StringBuilder();
        bool firstColumn = true;
        foreach (string value in row)
        {
            // Add separator if this isn't the first value
            if (!firstColumn)
                builder.Append(',');
            // Implement special handling for values that contain comma or quote
            // Enclose in quotes and double up any double quotes
            if (value.IndexOfAny(new char[] { '"', ',' }) != -1)
                builder.AppendFormat("\"{0}\"", value.Replace("\"", "\"\""));
            else
                builder.Append(value);
            firstColumn = false;
        }
        row.LineText = builder.ToString();
        WriteLine(row.LineText);
    }
}      static void WriteTest()
    {

        // Write sample data to CSV file
        using (CsvFileWriter writer = new CsvFileWriter("D://WriteTest.csv"))   CsvRow rowCol = new CsvRow();
            for (int j = 0; j < nbrCol; j++)

               rowCol.Add("Col" +j);

            writer.WriteRow(rowCol);
        {
            for (int i = 0; i < 100; i++)
            {
                CsvRow row = new CsvRow();
                for (int j = 0; j < 5; j++)
                    row.Add(String.Format("Column{0}", j));

                writer.WriteRow(row);
            }
        }
    }

Answer 1

simply this:

    static void WriteTest()
    {
        // Write sample data to CSV file
        using (CsvFileWriter writer = new CsvFileWriter(@"E:\SharedDoc1\WriteTest.csv"))
        {
            Random rnd = new Random();

            for (int i = 0; i < 100; i++)
            {
                CsvRow row = new CsvRow();
                for (int j = 0; j < 5; j++)
                    row.Add(rnd.NextDouble().ToString("0.000000")); //round to 6 decimal digits

                writer.WriteRow(row);
            }
        }
    }

the output is as following:

0.848731,0.525468,0.829536,0.397083,0.493102 0.398665,0.914157,0.768229,0.520031,0.249966 0.083535,0.409240,0.325824,0.177057,0.114989

Note that rnd.NextDouble() returns a double between 0 and 1, if you want larger numbers you should multiply it with your factor. For example if you want doubles up to 1000 do this:

row.Add((rnd.NextDouble() * 1000).ToString("0.0#####"));