Develop Reference

Finding a cell in devexpress datagrid

I'm new to DevExpress GridControl.
I need to find a particular cell in the grid and then do something with it's value.
How do I go about this please?
In the grid's Loaded method, I tried using myGrid.FindRowByValue("ProductType","ABC"), but always gives a negative number.
Thanks.

Here is code you can try
for (int i = 0; i < gridView1.DataRowCount; i++) {
object b = gridView1.GetRowCellValue(i, "FieldName");
if (b != null && b.Equals(<someValue>)){
gridView1.FocusedRowHandle = i;
return;
}
}
you can go to this link for more details.
https://www.devexpress.com/Support/Center/Question/Details/Q132599/get-row-by-cell-value

Unlike XtraGrid, the DXGrid for WPF does not provide the DataRowCount property - that is why we suggested checking the GridControl's ItemsSource. On the other hand, our grid has the VisibleRowCount property, which will be useful in some scenarios.
To accomplish this task, iterate through visible grid rows manually as shown below.
void MoveFocusToLast(GridControl grid, string fieldName, object value) {
for (int i = grid.VisibleRowCount - 1; i >= 0; i--) {
var handle = grid.GetRowHandleByVisibleIndex(i);
var currentValue = grid.GetCellValue(handle, fieldName);
if (currentValue != null && currentValue.Equals(value)) {
grid.View.FocusedRowHandle = handle;
return;
}
}
}
Grid also provides the FindRowByValue method, which allows you to
find a row by a specific cell value. This method returns the handle of
the corresponding row, and you can make that row visible by setting
the FocusedRowHandle property or calling ScrollIntoView. I
have prepared a sample demonstrating this approach.
See Also:
Traversing Rows
Find Row
Get RowHandle from a cell value

Read each cell values in WPF gridview

I have a datagridview in wpf called datagrid1. I need to read value in each cells in datagrid. I know how to do it in windows form
string result = datagrid1.Rows[0].Cells[1].Value.ToString();
How do this in WPF?

There is no easy way to do this in WPF, however this tutorial can be of use to you.
Edit:
First of all I totally agree with the comment Nitin Joshi mentioned above.
Second, According to this answer The WPF datagrid was built to bind to something like a DataTable. The majority of the time, you will modify the DataTable, and the Rows/Columns within the DataTable that is bound to the DataGrid, not the DataGrid it self so you don't need to use something like this datagrid1.Rows[0].Cells[1].Value. But if you still insist on getting the value that way, here is a solution :
Second EDIT:
Since you asked only for a way to read call value, I'll make my answer shorter but also a little more concrete:
GetCellValue method returns a string value representing cell content of a given DataGrid by column/row indices:
I wrote this method assuming column types are either TextBox, TextBlock or ComboBox. Other Types could be handled the same way.
public string GetCellValue(DataGrid datagrid, int row, int column)
{
var cellInfo = new DataGridCellInfo(
datagrid.Items[row], dataGrid.Columns[column]);
DataGridCell cell = null;
var cellContent = cellInfo.Column.GetCellContent(cellInfo.Item);
if (cellContent != null)
cell = (DataGridCell)cellContent.Parent;
if (cell == null) return string.Empty;
// if DataGridTextColumn / DataGridComboBoxColumn is used
// or AutoGeneratedColumns is True
if (cell.Content is TextBlock)
return ((TextBlock)cell.Content).Text;
else if (cell.Content is ComboBox)
return ((ComboBox)cell.Content).Text;
// if DataGridTemplateColumn is used
// assuming cells are either TextBox, TextBlock or ComboBox. Other Types could be handled the same way.
else
{
var txtPresenter = FindVisualChild<TextBox>((ContentPresenter)cell.Content);
if (txtPresenter != null) return txtPresenter.Text;
var txbPresenter = FindVisualChild<TextBlock>((ContentPresenter)cell.Content);
if (txbPresenter != null) return txbPresenter.Text;
var cmbPresenter = FindVisualChild<ComboBox>((ContentPresenter)cell.Content);
if (cmbPresenter != null) return cmbPresenter.Text;
}
return string.Empty;
}
public static T FindVisualChild<T>(DependencyObject obj) where T : DependencyObject
{
for (int i = 0; i < VisualTreeHelper.GetChildrenCount(obj); i++)
{
DependencyObject child = VisualTreeHelper.GetChild(obj, i);
if (child != null && child is T)
return (T)child;
else
{
T childOfChild = FindVisualChild<T>(child);
if (childOfChild != null)
return childOfChild;
}
}
return null;
}
Then calling string result = GetCellValue(dataGrid, 2, 1); (e.g. from a Button click event), will return the value of dataGrid[2,1].
*Note:
The SelectionUnit of the DataGrid must be set to Cell.
The DataGridmust fully generated otherwise ItemContainerGenerator returns null.
GetCellValue method works for a few UIElements considered to be more common to be used as DataGridColumn Types.

How to get column name from gridview?

I would like to know how can I get a column name from a gridview? by its number not by name.
like : Name|Age|Birthday: ( so name=0 , age=1 etc...)
thanks.

You can get it like this :
gv.HeaderRow.Cells[i].Text
Or like this :
gv.Rows[0].Cells[i].Text
Rows[0] should be your header row.

//// Header column names
int gridViewCellCount = yourGridView.Rows[0].Cells.Count;
// string array to hold grid view column names.
string[] columnNames = new string[gridViewCellCount];
for (int i = 0; i < gridViewCellCount; i++)
{
columnNames[i] = ((System.Web.UI.WebControls.DataControlFieldCell)(yourGridView.Rows[0].Cells[i])).ContainingField.HeaderText;
}

simply
GridView1.Rows[0].Cells[0].Text;
try this if you want to all the cells value from each of the rows
foreach (GridViewRow r in GridView1.Rows)
{
string s = r.Cells[0].Text;
string y = r.Cells[1].Text;
}
update:
try this
foreach (TableCell Tc in GridView1.HeaderRow.Cells)
{
//if you are not getting value than find childcontrol of TabelCell.
string sssb = Tc.Text;
foreach (Control ctl in Tc.Controls)
{
//Child controls
Label lb = ctl as Label;
string s = lb.Text;
}
}

Revisiting this old question.... it's possible to get the field names of the data bound to a GridView with this kind of code. This makes a dictionary of colnum and field name.
private static IDictionary<int, string> GetGridViewFieldNames(object grid)
{
var names = new Dictionary<int, string>();
var view = grid as GridView;
if (view != null) {
for (var i = 0; i < view.Columns.Count; i++) {
var field = view.Columns[i] as BoundField;
if (field != null) {
names.Add(i, field.DataField);
}
}
}
return names;
}

This is not the answer to the question. It is only the answer if you never change the header text in the gridview. The asker of the question wanted to get the database field name by index.
I've seen a number of "answers" which only provide the text in the selected row of a gridview, or the header text which both do not answer the question that was asked...
You may ask why? If you were going to do audits of updates in a system and wanted to compare old values and new values and only update if they change and want to indicate which field was updated how do you show the database table field name at the index of the loop.
For instance:
Protected Sub gv_RowUpdating(sender As Object, e As System.Web.UI.WebControls.GridViewUpdateEventArgs)
Dim intValCount As Integer = Integer.Parse(e.NewValues.Count)
If intValCount > 0 Then
Dim i As Integer = 0
For i = 0 To intValCount - 1
If Not e.OldValues(i).Equals(e.NewValues(i)) Then
' values have changed, audit the change
Sys.Audits.General(intID, "the_database_table", <the table field by index(i)>, e.OldValues(i).ToString, e.NewValues(i).ToString)
End If
i += 1
Next
End If
End Sub
So the questions is how do you get the database table field name by index via code behind? I too have been searching for this and all the "answers" that I've seen are not the answers I think some of us are really looking for. All the mentioned methods I've seen here are not bullet proof references to a database tables field name.

Its easy: Here i read the gridview header text for each header cell and add them as new columns to a data table.
DataTable dt = new DataTable();
foreach(DataControlFieldHeaderCell column in yourGridview.HeaderRow.Cells)
{
dt.Columns.Add(column.Text.Trim().Replace(" ", ""));
}
//Make sure you do all this after yourGridview.DataBind();
//If you do not want to bind data first simply bind an empty list like so:
/* yourGridview.DataSource = new List<string>();
yourGridview.DataBind(); */

How can i set the value of a datagrid cell using its Column and row index values?

How can i insert a value into a specific datagrid cell by using the cells column and row indexs. I have the Row and Column index saved as ints.
I got the indexs as below. Im basically taking the cell value, the column index and the row index and sending as a serialized XML to java which is sending it back and needs to put it in the same cell.
int column = dataGrid2.CurrentCell.Column.DisplayIndex;
int row = dataGrid2.SelectedIndex;
Thanks,

For a datagrid you access rows through the Items property. The cells are a collection on an item.
dataGrid2.Items[row].Cells[column].Text = "text";
This works as long as the data has been bound to the datagrid during the current page life-cycle. If this is not the case then I believe you are stuck walking the controls.

If you use DataGrid you can try it
DataRowView rowView = (dtGrid.Items[rows] as DataRowView); //Get RowView
rowView.BeginEdit();
rowView[col] = "Change cell here";
rowView.EndEdit();
dtGrid.Items.Refresh(); // Refresh table

To update a WPF DataGridCell programmatically, there could be many ways...
One of the ways is to update value in the bound data item itself. This way the property change notifications will fire for all subscribed visuals including the DataGridCell itself...
Reflection approach
var boundItem = dataGrid2.CurrentCell.Item;
//// If the column is datagrid text or checkbox column
var binding = ((DataGridTextColumn)dataGrid2.CurrentCell.Column).Binding;
var propertyName = binding.Path.Path;
var propInfo = boundItem.GetType().GetProperty(propertyName);
propInfo.SetValue(boundItem, yourValue, new object[] {});
For DataGridComboBoxColumn you would have to extract the SelectedValuePath and use that in place of propertyName.
Otherways include putting cell in edit mode and updating its content value using some behavior in the EditingElementStyle... I find this cumbersome.
Do let me know if you really need that.

I used a variation based upon WPF-it's example to do the whole row and it worked!:
(sender as DataGrid).RowEditEnding -= DataGrid_RowEditEnding;
foreach (var textColumn in dataGrid2.Columns.OfType<DataGridTextColumn>())
{
var binding = textColumn.Binding as Binding;
if (binding != null)
{
var boundItem = dataGrid2.CurrentCell.Item;
var propertyName = binding.Path.Path;
var propInfo = boundItem.GetType().GetProperty(propertyName);
propInfo.SetValue(boundItem, NEWVALUE, new object[] { });
}
}
(sender as DataGrid).RowEditEnding += DataGrid_RowEditEnding;
PS: Be sure that you use value types that are valid for the column (perhaps via a switch statement).
e.g.:
switch on propertyName or propInfo... propInfo.SetValue(boundItem, (type) NEWVALUE, new object[] {});
switch (propertyName)
{
case "ColumnName":
propInfo.SetValue(boundItem, ("ColumnName"'s type) NEWVALUE, new object[] { });
break;
default:
break;
}

How to programmatically set cell value in DataGridView?

I have a DataGridView. Some of the cells receive their data from a serial port: I want to shove the data into the cell, and have it update the underlying bound object.
I'm trying something like this:
SetValueFromSerial (decimal newValue)
{
dataGridView.CurrentCell.Value = newValue;
}
using a string doesn't help:
dataGridView.CurrentCell.Value = newValue.ToString ();
In both cases, I don't see anything in the grid, and the underlying value is unchanged.
I did Google and search here, but I didn't find anything. (I may have missed something, perhaps something obvious, but I'm not utterly lazy.)

If the DataGridView is databound, you shouldn't directly modify the content of the cell. Instead, you should modify the databound object. You can access that object through the DataBoundItem of the DataGridViewRow :
MyObject obj = (MyObject)dataGridView.CurrentRow.DataBoundItem;
obj.MyProperty = newValue;
Note that the bound object should implement INotifyPropertyChanged so that the change is reflected in the DataGridView

dataGridView1[1,1].Value="tes";

If you don't want to modify the databound object from some reason (for example you want to show some view in your grid, but you don't want it as a part of the datasource object), you might want to do this:
1.Add column manually:
DataGridViewColumn c = new DataGridViewColumn();
DataGridViewCell cell = new DataGridViewTextBoxCell();
c.CellTemplate = cell;
c.HeaderText = "added";
c.Name = "added";
c.Visible = true;
dgv.Columns.Insert(0, c);
2.In the DataBindingComplete event do something like this:
foreach (DataGridViewRow row in dgv.Rows)
{if (row.Cells[7].Value.ToString()=="1")
row.Cells[0].Value = "number one"; }
(just a stupid example)
but remember IT HAS to be in the DataBindingComplete, otherwise value will remain blank

I searched for the solution how I can insert a new row and How to set the individual values of the cells inside it like Excel. I solved with following code:
dataGridView1.ReadOnly = false; //Before modifying, it is required.
dataGridView1.Rows.Add(); //Inserting first row if yet there is no row, first row number is '0'
dataGridView1.Rows[0].Cells[0].Value = "Razib, this is 0,0!"; //Setting the leftmost and topmost cell's value (Not the column header row!)
dataGridView1[1, 0].Value = "This is 0,1!"; //Setting the Second cell of the first row!
Note:
Previously I have designed the columns in design mode.
I have set the row header visibility to false from property of the datagridview.
The last line is important to understand:
When yoou directly giving index of datagridview, the first number is cell number, second one is row number! Remember it!
Hope this might help you.

Do you remember to refresh the dataGridView?
datagridview.refresh();

I had the same problem
with sql-dataadapter to update data and so on
the following is working for me fine
mydatgridview.Rows[x].Cells[x].Value="test"
mydatagridview.enabled = false
mydatagridview.enabled = true

I tried a lot of methods, and the only one which worked was UpdateCellValue:
dataGridView.Rows[rowIndex].Cells[columnIndex].Value = "New Value";
dataGridView.UpdateCellValue(columnIndex, rowIndex);
I hope to have helped. =)

Try this way:
dataGridView.CurrentCell.Value = newValue;
dataGridView.EndEdit();
dataGridView.CurrentCell.Value = newValue;
dataGridView.EndEdit();
Need to write two times...

in VB you can use this one
Dim selectedRow As DataRowView
selectedRow = dg.Rows(dg.CurrentCell.RowIndex).DataBoundItem
selectedRow("MyProp") = "myValue"
dg.NotifyCurrentCellDirty(True)
thanks to saeed serpooshan for last row

The following works. I may be mistaken but adding a String value doesn't seem compatible to a DataGridView cell (I hadn't experimented or tried any hacks though).
DataGridViewName.Rows[0].Cells[0].Value = 1;

If the DataGridView has been populated by DataSource = x (i.e. is databound) then you need to change the bound data, not the DataGridView cells themselves.
One way of getting to that data from a known row or column is thus:
(YourRow.DataBoundItem as DataRowView).Row['YourColumn'] = NewValue;

I came across the same problem and solved it as following for VB.NET. It's the .NET Framework so you should be possible to adapt. Wanted to compare my solution and now I see that nobody seems to solve it my way.
Make a field declaration.
Private _currentDataView as DataView
So looping through all the rows and searching for a cell containing a value that I know is next to the cell I want to change works for me.
Public Sub SetCellValue(ByVal value As String)
Dim dataView As DataView = _currentDataView
For i As Integer = 0 To dataView.Count - 1
If dataView(i).Row.Item("projID").ToString.Equals("139") Then
dataView(i).Row.Item("Comment") = value
Exit For ' Exit early to save performance
End If
Next
End Sub
So that you can better understand it.
I know that ColumnName "projID" is 139. I loop until I find it and then I can change the value of "ColumnNameofCell" in my case "Comment". I use this for comments added on runtime.

Just like #Thomas said, the element you want to change must implement INotifyPropertyChanged. But, datasource is also important. It has to be BindingList, which you can create easily from List.
Here is my example - data source is at first DataTable, which I transfer to List and then create BindingList. Then I create BindingSource and use BindingList as DataSource from BindingSource. At last, DataSource from DataGridView uses this BindingSource.
sp_Select_PersonTableAdapter adapter = new sp_Select_PersonTableAdapter();
DataTable tbl = new DataTable();
tbl.Merge(adapter.GetData());
List<Person> list = tbl.AsEnumerable().Select(x => new Person
{
Id = (Int32) (x["Id"]),
Ime = (string) (x["Name"] ?? ""),
Priimek = (string) (x["LastName"] ?? "")
}).ToList();
BindingList<Person> bindingList = new BindingList<Person>(list);
BindingSource bindingSource = new BindingSource();
bindingSource.DataSource = bindingList;
dgvPerson.DataSource = bindingSource;
What is also very important: each class's member setter must call OnPropertyChanged(). Without that, it won't work. So, my class looks like this:
public class Person : INotifyPropertyChanged
{
private int _id;
private string _name;
private string _lastName;
public int Id
{
get { return _id; }
set
{
if (value != _id)
{
_id = value;
OnPropertyChanged();
}
}
}
public string Name
{
get { return _name; }
set
{
if (value != _name)
{
_name = value;
OnPropertyChanged();
}
}
}
public string LastName
{
get { return _lastName; }
set
{
if (value != _lastName)
{
_lastName= value;
OnPropertyChanged();
}
}
}
public event PropertyChangedEventHandler PropertyChanged;
[NotifyPropertyChangedInvocator]
protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
{
PropertyChangedEventHandler handler = PropertyChanged;
if (handler != null) handler(this, new PropertyChangedEventArgs(propertyName));
}
}
More on this topic: http://msdn.microsoft.com/en-us/library/system.componentmodel.inotifypropertychanged(v=vs.110).aspx

private void btn_Addtoreciept_Click(object sender, EventArgs e)
{
serial_number++;
dataGridView_inventory.Rows[serial_number - 1].Cells[0].Value = serial_number;
dataGridView_inventory.Rows[serial_number - 1].Cells[1].Value =comboBox_Reciept_name.Text;
dataGridView_inventory.Rows[serial_number - 1].Cells[2].Value = numericUpDown_recieptprice.Value;
dataGridView_inventory.Rows[serial_number - 1].Cells[3].Value = numericUpDown_Recieptpieces.Value;
dataGridView_inventory.Rows[serial_number - 1].Cells[4].Value = numericUpDown_recieptprice.Value * numericUpDown_Recieptpieces.Value;
numericUpDown_RecieptTotal.Value = serial_number;
}
on first time it goes well but pressing 2nd time it gives me error
"Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index" but when i click on the cell another row appears and then it works for the next row, and carry on ...