Below is my class code
public class TextReaderClass
{
public DataTable ReadTextFile(string filepath)
{
DataTable dtTextFile = new DataTable();
dtTextFile.Columns.Add("Emp_Id");
dtTextFile.Columns.Add("Emp_FirstName");
dtTextFile.Columns.Add("Emp_LastName");
dtTextFile.Columns.Add("Emp_Designation");
dtTextFile.Columns.Add("Emp_Salary");
dtTextFile.Columns.Add("Emp_JoiningDate");
//CODE to add here reading from text file and filling the data table
string[] readTextfile = System.IO.File.ReadAllLines(#"D:\Rutu\datatest.txt");
//Run a loop here for each record in the text file
foreach (string line in readTextfile)
{
var cols = line.Split(';');
DataRow dtrow = dtTextFile.NewRow();
//Create an object of Data Row
dtTextFile.Rows.Add(dtrow);
//Fill the row data in DataTable
}
return dtTextFile;
}
}
I tried this CODE for reading from text file and filling the data table. Any help will be highly appreciated. Thanks
You can do like that by doing this you you also read and add it to datatable
public DataTable ReadTextFile(string filePath, int numberOfColumns)
{
DataTable tbl = new DataTable();
for(int col =0; col < numberOfColumns; col++)
tbl.Columns.Add(new DataColumn("Column" + (col+1).ToString()));
string[] lines = System.IO.File.ReadAllLines(filePath);
foreach(string line in lines)
{
var cols = line.Split(':');
DataRow dr = tbl.NewRow();
for(int cIndex=0; cIndex < 3; cIndex++)
{
dr[cIndex] = cols[cIndex];
}
tbl.Rows.Add(dr);
}
return tbl;
}
try this code.
public DataTable ReadTextFile(string filepath,int numberOfColumns)
{
DataTable dtTextFile = new DataTable();
for(int col =0; col < numberOfColumns; col++)
dtTextFile.Columns.Add(new DataColumn("Column" + (col+1).ToString()));
string[] readTextfile = System.IO.File.ReadAllLines(filepath);
foreach (string line in readTextfile)
{
var cols = line.Split(';');
DataRow dtrow = dtTextFile.NewRow();
for(int cIndex=0; cIndex < 3; cIndex++)
{
dtrow [cIndex] = cols[cIndex];
}
dtTextFile.Rows.Add(dtrow);
}
return dtTextFile;
}
And also get datatable to gridview
dataGridview.DataSource=ReadTextFile(filepath,6);
If you have a formatted text file and MS SQL Server consider using the bulk insert facility:
https://learn.microsoft.com/en-us/sql/t-sql/statements/bulk-insert-transact-sql?view=sql-server-ver15
An example:
BULK INSERT Sales.Orders FROM 'C:\Rutu\datatest.txt' WITH ( FORMAT='CSV');
Related
I'm making a desktop application using the windows form with C#, I stored uploaded csv data with data grid view, then I make a transpose feature in the application, but did not work well, because the row of index or row 0 does not included in transpose output file.
Picture 1
So, I decided to add a empty row inside csv file at the top of data with this code
DataRow dr1 = dt.NewRow();
dt.Rows.InsertAt(dr1, 0);
I tried manually by insert empty row in csv and the application look like this
Picture 2
How should I code to make application insert an empty data row at 0 and store it in data grid view looks like a picture above? so my transpose feature works well
here I wrote to store the data in data grid
public DataSet ConnectCSV()
{
DataSet ds = new DataSet();
string fileName = openFileDialogCSVFilePath.FileName;
CsvReader reader = new CsvReader(fileName);
ds = reader.RowEnumerator;
dGridCSVdata.DataSource = ds;
dGridCSVdata.DataMember = "TheData";
return ds;
}
private void dGridCSVdata_Navigate(object sender, NavigateEventArgs ne)
{
}
here I wrote to read the data
public DataSet RowEnumerator
{
get
{
if (null == __reader)
throw new System.ApplicationException("I can't start reading without CSV input.");
__rowno = 0;
string sLine;
string sNextLine;
DataSet ds = new DataSet();
DataTable dt = ds.Tables.Add("TheData");
DataRow dr1 = dt.NewRow();
dt.Rows.InsertAt(dr1, 0);
while (null != (sLine = __reader.ReadLine()))
{
while (rexRunOnLine.IsMatch(sLine) && null != (sNextLine = __reader.ReadLine()))
sLine += "\n" + sNextLine;
__rowno++;
DataRow dr = dt.NewRow();
string[] values = rexCsvSplitter.Split(sLine);
for (int i = 0; i < values.Length; i++)
{
values[i] = Csv.Unescape(values[i]);
if (__rowno == 1)
{
dt.Columns.Add(values[i].Trim());
}
else
{
if (Csv.CharNotAllowes(values[i]))
{
dr[i] = values[i].Trim();
}
}
}
if (__rowno != 1)
{
dt.Rows.Add(dr);
}
ds.Tables.Add(Transposer.Transpose(dt));
// transpose code
StringBuilder sb = new StringBuilder();
for (int u = 0; u < dt.Columns.Count; u++)
{
for (int i = 0; i < dt.Rows.Count; i++)
{
sb.Append(dt.Rows[i][u].ToString());
if (i < dt.Rows.Count - 1)
{
sb.Append(',');
}
}
sb.AppendLine();
}
File.WriteAllText("C:\\Users\\Desktop\\Output.csv", sb.ToString());
}
__reader.Close();
return ds;
}
}
I have a program that are able to import an excel file to datatable binding with datagridview. Currently I need to add another column name InvtID and get that InvtID data from sql server based on Barcode column (column '3' as header) that I have been imported.
How am I able to achieve this one as right now my coding are able to get the data AFTER import an excel, so the InvtID column data are not in side-by-side with Barcode column. This is the only problem I encounter to finish this task, please assist me. Thank you
Here how my datatable looks like
public void filldatagridview(ExcelWorksheet workSheet)
{
DataTable dt = new DataTable();
//Create the data column
for (int col = workSheet.Dimension.Start.Column; col <= workSheet.Dimension.End.Column; col++)
{
dt.Columns.Add(col.ToString());
}
for (int row = 12; row <= 26; row++)
{
DataRow newRow = dt.NewRow(); //Create a row
int i = 0;
for (int col = workSheet.Dimension.Start.Column; col <= workSheet.Dimension.End.Column; col++)
{
newRow[i++] = workSheet.Cells[row, col].Text;
}
dt.Rows.Add(newRow);
}
dt.Columns.RemoveAt(0); //remove No
dt.Columns.RemoveAt(0); //remove article
//Get BookCode
using (SqlConnection conn = new SqlConnection("Server"))
using (SqlCommand cmd = new SqlCommand(null, conn))
{
StringBuilder sb = new StringBuilder("WITH cte AS(SELECT case WHEN InvtID IS NULL OR InvtID='' THEN 'No Bookcode Found' ELSE InvtID END AS InvtID,Barcode,ROW_NUMBER() OVER(PARTITION BY Barcode ORDER BY InvtID Asc) rid FROM InventoryCustomer) SELECT InvtID AS BOOKCODE FROM cte WHERE rid=1 and Barcode In (");
for (int i = 0; i < dt.Rows.Count; i++)
{
if (i != 0) sb.Append(",");
string name = "#P" + i;
cmd.Parameters.AddWithValue(name, dt.Rows[i]["3"]); //"3" is barcode column
sb.Append(name);
}
sb.Append(")");
cmd.CommandText = sb.ToString();
SqlDataAdapter da = new SqlDataAdapter(cmd);
da.Fill(dt);
dt.Columns["BOOKCODE"].SetOrdinal(0);
dataGridView2.DataSource = dt;
}
}
I am not sure if this is work.
Avoid adding new row when row is already exists.
Add column first from your dt DataTable
Just take a look at this code:
public void filldatagridview(ExcelWorksheet workSheet)
{
DataTable dt = new DataTable();
DataTable dtInvtID = new DataTable();
dt.Columns.Add("dtInvtID"); //ADDING NEW COLUMN FIRST FOR YOUR dtInvtID
//Create the data column
for (int col = workSheet.Dimension.Start.Column; col <= workSheet.Dimension.End.Column; col++)
{
dt.Columns.Add(col.ToString());
}
for (int row = 12; row <= 26; row++)
{
DataRow newRow = dt.NewRow(); //Create a row
int i = 0;
for (int col = workSheet.Dimension.Start.Column; col <= workSheet.Dimension.End.Column; col++)
{
newRow[i++] = workSheet.Cells[row, col].Text;
}
dt.Rows.Add(newRow);
}
dt.Columns.RemoveAt(0); //remove No
dt.Columns.RemoveAt(0); //remove article
//Get BookCode
using (SqlConnection conn = new SqlConnection("Server"))
using (SqlCommand cmd = new SqlCommand(null, conn))
{
StringBuilder sb = new StringBuilder("WITH cte AS(SELECT case WHEN InvtID IS NULL OR InvtID='' THEN 'No Bookcode Found' ELSE InvtID END AS InvtID,Barcode,ROW_NUMBER() OVER(PARTITION BY Barcode ORDER BY InvtID Asc) rid FROM InventoryCustomer) SELECT InvtID AS BOOKCODE FROM cte WHERE rid=1 and Barcode In (");
for (int i = 0; i < dt.Rows.Count; i++)
{
if (i != 0) sb.Append(",");
string name = "#P" + i;
cmd.Parameters.AddWithValue(name, dt.Rows[i]["3"]); //"3" is barcode column
sb.Append(name);
}
sb.Append(")");
cmd.CommandText = sb.ToString();
SqlDataAdapter da = new SqlDataAdapter(cmd);
da.Fill(dtInvtID);
dt.Columns["BOOKCODE"].SetOrdinal(0);
}
int dtctr = 0;
int ctr = 0;
foreach (DataRow dr in dt.Rows)//inserting the value of your InvtID to dt.Rows
{
dtctr += 1;
ctr = 1;
foreach (DataRow InvtID in dtInvtID.Rows) //Getting the value of dtInvtID from database
{
if (ctr == dtctr)//Condition when the row position is equal (dt.Rows==dtInvtID.Rows) IF THIS NOT RETURN A REAL POSITION THEN YOU CAN RUN IT IN DEBUG MODE T CHECK
{
dr["dtInvtID"] = InvtID[0];
ctr += 1;
break;
}
ctr += 1;
}
}
dataGridView2.DataSource = dt;
}
Reminders:
This code has not tested yet. Any wrong result you can check it and run in Debug Mode.
I've seen some interesting problem:
for (int i = 0; i < dt.Rows.Count; i++)
{
if (i != 0) sb.Append(",");
string name = "#P" + i;
cmd.Parameters.AddWithValue(name, dt.Rows[i]["3"]); //"3" is barcode column
sb.Append(name);
}
sb.Append(")");
Try to Modify it because my answer from above is getting the value of your database. It may cause a redundancy.
you are first inserting new rows into data table with this code.
dt.Rows.Add(newRow);
the second time you are using an adapter to fill the same data table with below code.
da.Fill(dt);
which insert the rows at the end instead of updating the existing rows in the data table.
To align the data into the data table you need to first fill another data table with an adapter then write code using for loop and matching data to update existing or original data table.
I have a DataTables with Emails. Over the LDAP I have the Userdata. Now Id like to Increase the DataTable depending upon the EmailAdress.
myDataTable.Columns.Add(new DataColumn("LDAP_Data"));
foreach(DataRow row in modiTable.Rows)
{
string myLDAPData = DoLDAPAction(row.Field<string>("EMAIL"));
//how to insert to myDataTable > LDAP_Data
}
how can I insert the new Data from LDAP to the new Column?
Thanks
If you add a row to a DataTable you have to add a row which columns match you table. This is why you get back a row if you call DataTable.Add().
Here an example how to add new rows:
static void Main(string[] args)
{
DataTable dt = new DataTable(); // Create a example-DataTable
dt.Columns.Add(new DataColumn() { ColumnName = "Name", DataType = typeof(string) }); // Add some columns
dt.Columns.Add(new DataColumn() { ColumnName = "Id", DataType = typeof(int) });
// Let's fill the table with some rows
for (int i = 0; i < 20; i++) // Add 20 Rows
{
DataRow row = dt.Rows.Add(); // Generate a row
row["Id"] = i; // Fill in some data to the row. We can access the columns which we added.
row["Name"] = i.ToString();
}
// Let's see what we got.
for (int i = 0; i < dt.Columns.Count; i++) // Loop through all columns
{
Console.Write(dt.Columns[i].ColumnName + ";"); // Write the ColunName to the console with a ';' a seperator.
}
Console.WriteLine();
foreach (DataRow r in dt.Rows) // Generic looping through DataTable
{
for (int i = 0; i < dt.Columns.Count; i++) // Loop through all columns
{
Console.Write(r[i] + ";");
}
Console.WriteLine();
}
}
You can do it by using the NewRow method:
foreach(DataRow row in modiTable.Rows)
{
string myLDAPData = DoLDAPAction(row.Field<string>("EMAIL"));
DataRow row = modiTable.NewRow();
row["EMAIL"] = myLDAPData;
//You might want to specify other values as well
}
Or you can use the Add() method, as suggested in kara's answer.
myDataTable.Columns.Add(new DataColumn("LDAP_Data"));
foreach(DataRow row in modiTable.Rows)
{
string myLDAPData = DoLDAPAction(row.Field<string>("EMAIL"));
var row = myDataTable.NewRow()
row["LDAP_Data"] = YOUR_DATA;
myDataTable.Rows.Add(row);
}
This is going to be my text file (30 lines)
OrderNo:37374
OrderQuantity:250
BarcodeQR:584,25478Klkd28
NormalBarcode:1565484864
.......
.......
.......
This is the code :
public DataTable DTforReport()
{
DataTable dt = new DataTable();
DataColumn col = new DataColumn("test");
col.DataType = System.Type.GetType("System.String");
dt.Columns.Add(col);
string[] lines = File.ReadAllLines("C:\\Users\\abc\\Desktop\\abc.txt");
foreach (var line in lines)
{
var segments = line.Split(';');
foreach (var seg in segments)
{
DataRow dr = dt.NewRow();
dr[0] = seg;
dt.Rows.Add(dr);
}
}
return dt;
}
I want my output like this
OrderNo OrderQuantity BarcodeQR
37374 250 584,25478Klkd28
How can I change my code to achieve this?
You have generated only one column. Change your code like below to see your desired result:
public DataTable DTforReport()
{
DataTable dt = new DataTable();
string[] lines = File.ReadAllLines("C:\\Users\\abc\\Desktop\\abc.txt");
DataRow dr = dt.NewRow();
for (int i = 0; i < lines.Length; i++)
{
DataColumn col = new DataColumn(lines[i].Split(':')[0]);
col.DataType = Type.GetType("System.String");
dt.Columns.Add(col);
var segment = lines[i].Split(':')[1];
dr[i] = segment;
}
dt.Rows.Add(dr);
return dt;
}
I suggest you to modify your method like the following:
public DataTable DTforReport()
{
DataTable testTable = new DataTable("Test");
testTable.Columns.Add("OrderNo");
testTable.Columns.Add("OrderQuantity");
testTable.Columns.Add("BarcodeQR");
string[] lines = File.ReadAllLines("C:\\Users\\abc\\Desktop\\abc.txt");
foreach (var line in lines)
{
DataRow dRow = testTable.NewRow();
var segments = line.Split(';');
for (int i = 0; i < segments.Length; i++)
{
var colValues = segments[i].Split(':');
dRow[i] = colValues[1];
}
testTable.Rows.Add(dRow);
}
return testTable;
}
Few suggestions for improvement:
I have given static column names, if you want to add more or they may change in future means you can create dynamic columns in the datatable.
If you have doubts in the input values, make use of proper validation
Validations in the sense, make sure about the splitted values before accessing them through index otherwise they may ends up with IndexOutOfRangeException
DataTable dt = new DataTable();
string[] lines = File.ReadAllLines("C:\\Users\\abc\\Desktop\\abc.txt");
var firstLine = lines.First();
var columns = firstLine.Split(';');
for (var icount = 0; icount < columns.Count(); icount++)
{
var colName = columns[icount].Contains(":") ? columns[icount].Split(':')[0] : "Column" + icount;
var dataCol = new DataColumn(colName);
dataCol.DataType = System.Type.GetType("System.String");
dt.Columns.Add(dataCol);
}
foreach (var line in lines)
{
DataRow dr = dt.NewRow();
var segments = line.Split(';');
for (var icount = 0; icount < segments.Count(); icount++)
{
var colVal = segments[icount].Contains(":") ? segments[icount].Split(':')[1] : "";
dr[icount] = colVal;
}
dt.Rows.Add(dr);
}
*Number of column must be same in each row.
In normal WinForm application you can do that:
DataTable dataTable = new DataTable();
dataTable = dataGridRecords.DataSource;
but how to do that with the WPF datagrid?
dataTable = dataGridRecords.ItemsSource;
won't work either.
In WPF you don't do this
DataGrid.ItemsSource = DataTable;
Instead you do
DataGrid.ItemsSource = DataTable.AsDataView();
In order to get DataTable back you can do something like this
public static DataTable DataViewAsDataTable(DataView dv)
{
DataTable dt = dv.Table.Clone();
foreach (DataRowView drv in dv)
dt.ImportRow(drv.Row);
return dt;
}
DataView view = (DataView) dataGrid.ItemsSource;
DataTable table = DataViewAsDataTable(view)
You don't need the DataViewAsDataTable method. Just do the following:
DataTable dt = ((DataView)dataGrid1.ItemsSource).ToTable();
try this
public static DataTable DataGridtoDataTable(DataGrid dg)
{
dg.SelectAllCells();
dg.ClipboardCopyMode = DataGridClipboardCopyMode.IncludeHeader;
ApplicationCommands.Copy.Execute(null, dg);
dg.UnselectAllCells();
String result = (string)Clipboard.GetData(DataFormats.CommaSeparatedValue);
string[] Lines = result.Split(new string[] { "\r\n", "\n" }, StringSplitOptions.None);
string[] Fields;
Fields = Lines[0].Split(new char[] { ',' });
int Cols = Fields.GetLength(0);
DataTable dt = new DataTable();
for (int i = 0; i < Cols; i++)
dt.Columns.Add(Fields[i].ToUpper(), typeof(string));
DataRow Row;
for (int i = 1; i < Lines.GetLength(0)-1; i++)
{
Fields = Lines[i].Split(new char[] { ',' });
Row = dt.NewRow();
for (int f = 0; f < Cols; f++)
{
Row[f] = Fields[f];
}
dt.Rows.Add(Row);
}
return dt;
}