Develop Reference

I need helping adding two different rows(with same columns) to the same datatable

Working on a windows form application that reads in data from csv files and adds the data to a Datagridview. I ran into an issue with all of the rows being added to the datable and being displayed on the datagridview. The datagridview displays the datarows from the first two if conditions and OneRow if condition only. It will not add the rows from the twoRow if condition if the datable and datagridview rows are populated with the OneRow if condition rows. But i want the rows from both OneRow and TwoRow to be displyed. Also the rows from TwoRow do populate the datatable and datagridview when I comment(/**/) out the OneRow if condition. But I need both to populate the table. Thanks in advance!
Construct.MainDataTable.Columns.Add("Date", typeof(DateTime));
Construct.MainDataTable.Columns.Add("Time");
Construct.MainDataTable.Columns.Add("Serial");
Construct.MainDataTable.Columns.Add("Type");
Construct.MainDataTable.Columns.Add("level");
Construct.MainDataTable.Columns.Add("price");
Construct.MainDataTable.Columns.Add(" Limit");
Construct.MainDataTable.Columns.Add("last Limit");
Construct.MainDataTable.Columns.Add("Data");
..........................
...............................................
DataRow oneRow = Construct.MainDataTable.NewRow();
DataRow twoRow = Construct.MainDataTable.NewRow();
dataGridView2.AllowUserToAddRows = false;
if (line.Split(',')[2].Equals("Time"))
{
time = line.Split(',')[3];
date = line.Split(',')[1];
}
if (line.Split(',')[2].Equals("Level"))
{
level = line.Split(',')[3];
}
//OneROw(IF condition)
if ((Convert.ToDecimal(line.Split(',')[8])) < (Convert.ToDecimal (line.Split(',')[12])))
{
type = line.Split(',')[1];
serial = line.Split(',')[7];
price = line.Split(',')[3];
Limit = line.Split(',')[8];
lastLimit = line.Split(',')[10];
Data = line.Split(',')[12];
oneRow["Date"] = date;
oneRow["Time"] = time;
oneRow["Serial"] = serial;
oneRow["Type"] = type;
oneRow["level"] = level;
oneRow["price"] = price;
oneRow[" Limit"] = Limit;
oneRow["last Limit"] = lastlimit;
oneRow["Data"] = Data;
Construct.MainDataTable.Rows.Add(oneRow);
}
//TwoROw(IF condition)
if ((line.Contains('"')) && ((line.Contains("NG"))))
{
price = line.Split(',')[3];
type = line.Split(',')[1];
serial = line.Split(',')[7];
Limit = line.Split('"')[7];
var valLimit = Limit.Split(',').Select(a => Convert.ToInt32(a, 16));
var limitJoin = String.Join(",", valLimit);
lastlimit = line.Split('"')[1];
var vallastLimit = lastlimit.Split(',').Select(d => Convert.ToInt32(d, 16));
var lastJoin = String.Join(",", vallastLimit);
Data = line.Split('"')[5];
var valDatas = Data.Split(',').Select(s => Convert.ToInt32(s, 16));
var dataJoin = String.Join(",", valDatas);
twoRow["Date"] = date;
twoRow["Time"] = time;
twoRow["Serial"] = serial;
twoRow["Type"] = type;
twoRow["level"] = level;
twoRow["price"] = price;
twoRow["Limit"] = limitJoin;
twoRow["last Limit"] = lastJoin;
twoRow["Data"] = dataJoin;
Construct.MainDataTable.Rows.Add(twoRow);
}
dataGridView2.DataSource = Construct.MainDataTable;

Can't add a comment because I don't have enough karma so I ask my questions here: So, if I understood your problem you can't add data from one .csv file if it have more then one row? Why are you using 2 different if conditions for row in .csv file?
If you have empty data in row never mind you can still place them to your DataTable column, so you can use loop to add data from .csv to your DataTable. Try some thing like this:
public static DataTable CsvToDataTable(string csv)
{
DataTable dt = new DataTable();
string[] lines = csv.Split(new[] { "\r\n", "\r", "\n" }, StringSplitOptions.RemoveEmptyEntries);
Regex onlyDeimiterComma = new Regex(",(?=(?:[^\"]*\"[^\"]*\")*(?![^\"]*\"))");
for (int i = 0; i < lines.Length; i++)
{
DataRow row = dt.NewRow();
string[] cells = onlyDeimiterComma.Split(lines[i]);
for (int j = 0; j < cells.Length; j++)
{
if (i == 0)
{
if (j == 0)
{
dt.Columns.Add(cells[j], typeof(DateTime));
}
else
{
dt.Columns.Add(cells[j]);
}
}
else
{
row[j] = cells[j];
}
}
dt.Rows.Add(row);
}
return dt;
}
Just call this method anywhere in your code and give it string read from your .csv file.
You can try to compile this code here and see how it works on .csv data with different data (empty columns, quoted text, quoted commas)
UPD: If you need to fill DataTable from two different .csv files you can still use code above. Just call it twice for both files and then Merge two DataTable, like this:
DataTable dt = CsvToDataTable(csvFileOne);
DataTable dtTwo = CsvToDataTable(csvFileTwo);
dt.Merge(dtTwo);

Get generic collection values from DataGridView to Xml file

In my xml file,it has many elements and many child/sub child elements are there so i have decided to load as generic list and display in the DGView and the columns are already created/customed in DGview.
I have to edit the values in the datagridview and serialize back to the file. I would like to know,
how can i get the values from the datagrid view and serialize back to the file.
I tried using this, Dataset ds = new Dataset();ds = (Dataset) (dataGridView2.Datasource);ds.WriteXml("XML_File.xml"); i got a error message, nullRefExceptionError.
As I know the DataSet ds is null, thats why I'm getting this error.
I don't want to use the dataset for binding.I want to bind the xml file directly to the datagridview. IS it possible with my approach???
This approach is good but it's not saving the xml file as like the original xml file:
DataTable dt = new DataTable("Rules");
for (int i = 0; i < dataGridView4.ColumnCount; i++)
{
dt.Columns.Add(dataGridView4.Columns[i].Name, typeof(System.String));
}
DataRow myrow;
int icols = dataGridView4.Columns.Count;
foreach (DataGridViewRow drow in this.dataGridView4.Rows)
{
myrow = dt.NewRow();
for (int i = 0; i <= icols - 1; i++)
{
myrow[i] = drow.Cells[i].Value;
}
dt.Rows.Add(myrow);
}
dt.WriteXml(#"C:\test\items.xml");
Any help for me to serilaize/write the values from datagridview.

I have adapted this approach for my problem & it works.
List<Test>laneConfigs = new List<Test>();//From a class
foreach (DataGridViewRow dr in dataGridView1.Rows)
{
int bbbBorder = 0;
Int32.TryParse(dr.Cells["BBor"].Value.ToString(), out bbbBorder );
int eeee= 0;
Int32.TryParse(dr.Cells["EBor"].Value.ToString(), out eee);
LaneConfig laneConfig = new LaneConfig(
dr.Cells["ID"].Value.ToString(),
(TrafficLaneType)Enum.Parse(typeof(TrafficLaneType), dr.Cells["Type"].Value.ToString()),
new ValueWithUnit<int>(bbbBorder, "mm"),
new ValueWithUnit<int>(eee, "mm"));
laneConfigs.Add(llaneConfig);
}

how to split the values of column in datatable of dataset?

In my dataset I have many rows,
In first row last column has the value is "12356.56#Firefox 1#23423"
In Second row same column has the value is "12356.56#Chrome2.0#23423"
In Third row same column has the value is "3423#Firefox 14.0#sdfsd"
here instead of displaying same value like above..
I need to display just "Firefox" if that column has Firefox in UI
I need to display just "Chrome" if that column has Chromein UI
how can i do it...

Use this helper function
public static string GetBrowser(string str)
{
str = str.ToUpper();
if(str.Contains("CHROME"))
{
return "Chrome";
}
else if(str.Contains("FIREFOX"))
{
return "Firefox";
}
return "Unknown";
}
Then when you bind the dataset to the UI use it to display the value.

If you have a list of things you want to check for, you can use .Contains to check:
var myValue = myDS[rowIndex][lastColumn].ToString();
if (myValue.Contains("Firefox"))
return "Firefox";
else if (myValue.Contains("Chrome"))
return "Chrome";
else
return "Unknown";
Demo: http://ideone.com/pMVeD
From the examples you've given, it appears the following logic may work, but it should be tested against a wider variety of sample values:
var myValue = myDS[rowIndex][lastColumn].ToString();
var parts = myValue.Split('#');
var browser = parts[1].Split(' ','0','1','2','3','4','5','6','7','8','9');
return browser[0];
Demo: http://ideone.com/NrY1e

Here is code. This might help.
DataSet ds = new DataSet();
//DataTable dt = new DataTable();
ds.Tables.Add("table0");
DataColumn dc = new DataColumn("browser");
ds.Tables[0].Columns.Add(dc);
ds.Tables[0].Rows.Add("12356.56#Firefox1#23423");
for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
{
string str = ds.Tables[0].Rows[i][0].ToString();
if((str.ToLower().CompareTo("firefox"))!=0)
{
ds.Tables[0].Rows[i][0] = "firefox";
}
}
_gridView.DataSource = ds;
_gridView.DataBind();

DataGridView - Parent to Child Database Relation - Updating child DataGridView data

Would someone kindly assist me with the following? I have two DataGridView objects that each display a DataTable, where the two datatables are related with the following code:
DataSet dSet = new DataSet();
DataTable ParentList = ListToDataTable(_listOfAllAlbumObjects);
DataTable ChildList = ListToDataTable(_listOfAllTrackObjects);
dSet.Tables.AddRange(new DataTable[]{ParentList, ChildList});
DataColumn parentRelationColumn = ParentList.Columns["AlbumId"];
DataColumn childRelationColumn = ChildList.Columns["AlbumId"];
dSet.Relations.Add("ParentToChild", parentRelationColumn, childRelationColumn);
ParentDataGridView.DataSource = dSet;
ParentDataGridView.DataMember = "ParentList";
ChildDataGridView.DataSource = ???;
ChildDataGridView.DataMember = "ParentToChild";
Both DataTables are actually List<> converted to DataTables with the following:`
public static DataTable ListToDataTable<T>( IList<T> data)
{
var props = TypeDescriptor.GetProperties(typeof(T));
var table = new DataTable();
for (var i = 0; i < props.Count; i++)
{
PropertyDescriptor prop = props[i];
table.Columns.Add(prop.Name, prop.PropertyType);
}
var values = new object[props.Count];
foreach (T item in data)
{
for (int i = 0; i < values.Length; i++)
{ values[i] = props[i].GetValue(item); }
table.Rows.Add(values);
}
return table;
}
Initially it appears that the each DataGridView displays the data appropriately; however the child DataGridView does not update with any change of record in the parent DataGridView.
I see that the tables need to be interconnected through the binding-source; however I don't believe there is a true binding-source here.
Could someone please steer me in the right direction? Thanks.

There's an MSDN article showing what you want to do:
How to: Create a Master/Detail Form Using Two Windows Forms DataGridView Controls
Here's how this might work for you:
Either through the designer or through code add two BindingSources to your project: parentBindingSource and childBindingSource. Then try this in place of the code you have.
// Associate your BSs with your DGVs.
ParentDataGridView.DataSource = parentBindingSource;
ChildDataGridView.DataSource = childBindingSource;
// (Most of) your code here:
DataSet dSet = new DataSet();
DataTable ParentList = ListToDataTable(_listOfAllAlbumObjects);
DataTable ChildList = ListToDataTable(_listOfAllTrackObjects);
dSet.Tables.AddRange(new DataTable[]{ParentList, ChildList});
DataColumn parentRelationColumn = ParentList.Columns["AlbumId"];
DataColumn childRelationColumn = ChildList.Columns["AlbumId"];
dSet.Relations.Add("ParentToChild", parentRelationColumn, childRelationColumn);
// Let's name this DT to make clear what we're referencing later on.
ParentList.TableName = "ParentListDT";
// Rather than set the data properties on your DGVs, set them in your BindingSources.
parentBindingSource.DataSource = dSet;
parentBindingSource.DataMember = "ParentListDT";
childBindingSource.DataSource = parentBindingSource;
childBindingSource.DataMember = "ParentToChild";

Datatable subset of columns from another datatable

I have a datatable with 17 columns and a bunch of data.
I wnat a datatable with only 6 of the columns and the data for those 6 columns.
So I need a subset of the original datatable.
How do I loop through the original datatable with 17 columns and end up with a datatable with only the 6 columns I want with the corresponding data for those 6 columns?

Private Function createSmallCopyofExistingTable(ByVal SourceTable As DataTable) As DataTable
Dim newTable As DataTable = New DataTable()
'Copy Only 6 columns from the datatable
Dim ColumnsToExport() As String = {"ID", "FirstName", "LastName", "DateOfBirth", "City", "State"}
newTable = SourceTable.DefaultView.ToTable("tempTableName", False, ColumnsToExport)
Return newTable
End Function

Without knowing more about how generic this needs to be its really just...
foreach (DataRow dr in dt.Rows)
{
newDt.Rows.Add(dr["col1"],dr["col5"],etc);
}

what about data types, and columns? are these same? if yes, you can create
object[] row = new object[]{// Fill your rows manually};
before filling it create
DataTable dt = new DataTable();
dt.Columns.Add("Title",typeof(string etc..));.....
and finally
dt.Rows.Add(row);

Personally, I would avoid creating another instance of a DataTable.
It depends on your situation, of course, but if this is purely for usability and not for security (i.e. you're not trying to remove columns with sensitive data before transmitting it somewhere), then I would create a wrapper object that encapsulates the columns that you want to expose.
The benefit of using a wrapper is in case you are doing any updates, then you can update the source table directly rather than the copy. Whether this really matters, of course, depends on your situation.
A simple example with limited functionality:
public class MyFormOrPage
{
void UsageExample()
{
DataTable allDataTable = new DataTable();
// populate the data table with whatever logic ...
// wrap the data table to expose only the Name, Address, and PhoneNumber columns
var limitedDataTable = new DataTableWrapper(allDataTable, "Name", "Address", "PhoneNumber");
// iterate over the rows
foreach (var limitedDataRow in limitedDataTable)
{
// iterate over the columns
for (int i = 0; i < limitedDataTable.ColumnCount; i++)
{
object value = limitedDataRow[i];
// do something with the value ...
}
}
// bind the wrapper to a control
MyGridControl.DataSource = limitedDataTable;
}
}
public class DataTableWrapper : IEnumerable<DataRowWrapper>
{
private DataTable _Table;
private string[] _ColumnNames;
public DataTableWrapper(DataTable table, params string[] columnNames)
{
this._Table = table;
this._ColumnNames = columnNames;
}
public int ColumnCount
{
get { return this._ColumnNames.Length; }
}
public IEnumerator<DataRowWrapper> GetEnumerator()
{
foreach (DataRow row in this._Table.Rows)
{
yield return new DataRowWrapper(row, this._ColumnNames);
}
}
#region IEnumerable Members
System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()
{
return this.GetEnumerator();
}
#endregion
// if you _really_ want to make a copy of the DataTable, you can use this method
public DataTable CopyToDataTable()
{
DataTable copyTable = new DataTable();
for (int index = 0; index < this._ColumnNames.Length; index++)
{
DataColumn column = this._Table.Columns[index];
copyTable.Columns.Add(column);
}
foreach (DataRow row in this._Table.Rows)
{
DataRow copyRow = copyTable.NewRow();
for (int index = 0; index < this._ColumnNames.Length; index++)
{
copyRow[index] = row[this._ColumnNames[index]];
}
copyTable.Rows.Add(copyRow);
}
return copyTable;
}
}
// let's make this a struct, since potentially very many of these will be instantiated
public struct DataRowWrapper
{
private DataRow _Row;
private string[] _ColumnNames;
public DataRowWrapper(DataRow row, params string[] columnNames)
{
this._Row = row;
this._ColumnNames = columnNames;
}
// use this to retrieve column values from a row
public object this[int index]
{
get { return this._Row[this._ColumnNames[index]]; }
set { this._Row[this._ColumnNames[index]] = value; }
}
// just in case this is still needed...
public object this[string columnName]
{
get { return this._Row[columnName]; }
set { this._Row[columnName] = value; }
}
}