Export a C# DataSet to a text file
Solution 1
This should space out fixed length font text nicely, but it does mean it will process the full DataTable twice (pass 1: find longest text per column, pass 2: output text):
static void Write(DataTable dt, string outputFilePath)
{
int[] maxLengths = new int[dt.Columns.Count];
for (int i = 0; i < dt.Columns.Count; i++)
{
maxLengths[i] = dt.Columns[i].ColumnName.Length;
foreach (DataRow row in dt.Rows)
{
if (!row.IsNull(i))
{
int length = row[i].ToString().Length;
if (length > maxLengths[i])
{
maxLengths[i] = length;
}
}
}
}
using (StreamWriter sw = new StreamWriter(outputFilePath, false))
{
for (int i = 0; i < dt.Columns.Count; i++)
{
sw.Write(dt.Columns[i].ColumnName.PadRight(maxLengths[i] + 2));
}
sw.WriteLine();
foreach (DataRow row in dt.Rows)
{
for (int i = 0; i < dt.Columns.Count; i++)
{
if (!row.IsNull(i))
{
sw.Write(row[i].ToString().PadRight(maxLengths[i] + 2));
}
else
{
sw.Write(new string(' ', maxLengths[i] + 2));
}
}
sw.WriteLine();
}
sw.Close();
}
}
Solution 2
it is better that you export your data to xml format.
dataset have a method for this work :
DataSet ds = new DataSet();
ds.WriteXml(fileName);
you can read a xml and fill dataset data like below :
DataSet ds = new DataSet();
ds.ReadXml(fileName);
Solution 3
what I would do is:
foreach (DataRow row in myDataSet.Tables[0].Rows)
{
foreach (object item in row.ItemArray)
{
myStreamWriter.Write((string)item + "\t");
}
myStreamWriter.WriteLine();
}
Maybe add column names before the loops if you want the headers. That I think, although being rather simple, should do the trick.
Solution 4
what about the below?
public static void Write(DataTable dt, string filePath)
{
int i = 0;
StreamWriter sw = null;
sw = new StreamWriter(filePath, false);
for (i = 0; i < dt.Columns.Count - 1; i++)
{
sw.Write(dt.Columns[i].ColumnName + " ");
}
sw.Write(dt.Columns[i].ColumnName);
sw.WriteLine();
foreach (DataRow row in dt.Rows)
{
object[] array = row.ItemArray;
for (i = 0; i < array.Length - 1; i++)
{
sw.Write(array[i] + " ");
}
sw.Write(array[i].ToString());
sw.WriteLine();
}
sw.Close();
}
bobble14988
Computer Science Graduate of Newcastle University, UK.
Updated on August 25, 2020Comments
-
bobble14988 over 3 years
There are a lot of examples online of how to fill a DataSet from a text file but I want to do the reverse. The only thing I've been able to find is this but it seems... incomplete?
I want it to be in a readable format, not just comma delimited, so non-equal spacing between columns on each row if that makes sense. Here is an example of what I mean:
Column1 Column2 Column3 Some info Some more info Even more info Some stuff here Some more stuff Even more stuff Bits and bobs
Note: I only have one DataTable within my DataSet so no need to worry about multiple DataTables.
EDIT: When I said "readable" I meant human-readable.
Thanks in advance.