I need to add columns to an existing datatable by reading the data in first row of the existing datatable. And then need to add data to the new columns from a text file. For an example please consider the table given below as the existing datatable. And i have mentioned the values in the first row here (dm1, dm2,..)
And provided below is the datatable which i require. dm4 row data and dm6 row data has been added to two new columns here
Can someone please help me to identify a solution. Thanks in advance
private DataTable CreateDT1(string name, ListBox list)
{
DataTable dt = new DataTable();
//there are many files in the list box
string[] files = new string[list.Items.Count];
for (int x = 0; x < list.Items.Count; x++)
{
object s = list.Items[x];
files[x] = s.ToString();
}
int lineno = 0;
//for each file in list box
for (int i = 0; i < files.Length; i++)
{
int count = 0;
string file = files[i];
using (System.IO.StreamReader sr = new System.IO.StreamReader(file))
{
string line;
while ((line = sr.ReadLine()) != null)
{
if (line.Contains(name))//filtering the line which contains a specific string"
{
if (i == 0)
{
if (lineno == 0)//first choosen line of the first text file.
{
//splitting the choosen line
string[] split = line.Split(',');
int result = split.Length;
dt.Rows.Add();
//Based on the number of split length of this row i have added columns
for (int x = 0; x < result; x++)
{
DataColumn dc = new DataColumn(x.ToString(), Type.GetType("System.String"));
dt.Columns.Add(dc);
dt.Rows[lineno][x+1] = split[x];
}
}
else//splitting and adding other lines of the first text file
{
string[] split = line.Split(',');
int result = split.Length;
dt.Rows.Add();
for (int x = 0; x < result; x++)
{
dt.Rows[lineno][x + 1] = split[x];
}
}
}
else//adding lines of other text files underneath the same columns
{
if (count != 0)
{
string[] split = line.Split(',');
int result = split.Length;
if (result+1 <= dt.Columns.Count)
{
dt.Rows.Add();
for (int x = 0; x < result; x++)
{
dt.Rows[lineno][x + 1] = split[x];
}
}
else//My issue occurs here when there are additional columns in the other files. Basically when the split length of a line is higher than the previous text files. Then i have to add a new column at the specific positions
{
dt.Rows.Add();
for (int x = 0; x < result; x++)
{
if (split[x]!=dt.Rows[0][x+1])
{
DataColumn dc = new DataColumn(split[x], Type.GetType("System.String"));
dt.Columns.Add(dc);
dt.Rows[lineno][x + 1] = split[x];
}
}
}
}
else
{
lineno -= 1;
count += 1;
}
}
lineno += 1;
}
}
}
}
return dt;
}
