Develop Reference

Display Datagridview dynamically created chechboxvalue? c#

I want to check all/ only certain Checkboxes as checked.
I tried various versions from stackoverflow but none seem to work out.
The code is called directly after dynamically creating the datagrid as I only want to load the Data once. - Datagrid is created in my Form_Load
The value of the Checkboxes are changed but not displayed.
//This is how i create the Datagrid column - not question relevant
for (int kacnt = 1; kacnt <= Ei.Kaanzahl; kacnt++)
{
DataGridViewCheckBoxColumn Kachk = new DataGridViewCheckBoxColumn();
Kachk.HeaderText = "Kamera" + kacnt;
Kachk.Width = 70;
WarDataGridView.Columns.Add(Kachk);
}
// The code I actually have problems with - the display of the value
foreach (DataGridViewRow row in WarDataGridView.Rows)
{
for (int col = 1; col < WarDataGridView.ColumnCount; col++)
{
(WarDataGridView.Rows[row.Index].Cells[col] as DataGridViewCheckBoxCell).Value = true;}}

Set your columns' True and False values like so:
Kamerachk.TrueValue = true;
and
Kamerachk.TrueValue = false;

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

FindControl and Get Selected Value of Dropdown

This scenario is occurring when using C# code behind to find HTML Controls added dynamically from SQL Data Results.
Using the following there is an iteration though the Table rows and row each table row, we write the Controls value, in this case a HtmlSelect. The Html Select Element is in Cell 3
for (int i = 1; i <= Table1.Rows.Count - 1; i++)
{
HtmlSelect select = Form.FindControl("MainContent_selectBoxstatus" + i) as HtmlSelect;
System.Diagnostics.Debug.Write(select.Value);
}
Resulting in:
A first chance exception of type 'System.NullReferenceException'
occurred in project.dll
If i use the following:
for (int i = 1; i <= Table1.Rows.Count - 1; i++)
System.Diagnostics.Debug.Write(Table1.Rows[i].Cells[0].Text);
I get the desired result, of the text from Cell 1.
How the Select Dropdown is created:
for (int i = 0; i < dr.FieldCount; i++)
HtmlSelect sStatus = new HtmlSelect();
sStatus.Items.Add(new ListItem("Working", "0"));
sStatus.Items.Add(new ListItem("Fault", "1"));
sStatus.SelectedIndex = 0;
sStatus.Attributes.Add("class", "dropdownlist");
sStatus.ID = "selectBoxstatus" + rowindex;
cell.Controls.Add(sStatus);

That's what usually happens when you are trying to "hack" ASP.NET internals. I mean "hack" because using magic strings to resolve the auto-generated ids assigned to child controls is extremely unsafe. There are much better and safer ways to do this.
1- If you want to render a tabular layout, I'd strongly recommend using a databound control such as a GridView, ListView, etc where you can intersect its RowDatabound event and retrieve the child controls in a safe manner
2- If you can't afford to do a re-write then replace your code as follows...
for (int i = 0; i < Table1.Rows.Count; i++)
{
HtmlSelect select = Table1.Rows[i].Cells[0].FindControl(string.Format("selectBoxstatus{0}", i)) as HtmlSelect;
if(select != null)
System.Diagnostics.Debug.Write(select.Value);
}
Option 2 Code Analysis
for (int i = 0; i < Table1.Rows.Count; i++)
Nitpicking, but initializing i to 0 this makes it easier to read...believe it
HtmlSelect select = Table1.Rows[i].Cells[0].FindControl(string.Format("selectBoxstatus{0}", i)) as HtmlSelect;
I'm not too sure what Form meant in your original post but it makes more sense to use the object you're iterating....Table1 rows collection. I also refer to Cell[0] which is the first cell in the iteration's current row(feel free to adjust it)...this is still not safe but it's the only way to achieve it in the current scenario, if you need more code safety, then resort to option one. Also notice that FindControl doesn't mess around with auto-generated id, it simply uses the actual Id specified for the child control
if(select != null)
After you attempt to retrieve the select control make sure to check whether the control was successfully retrieved or not.
Hope it makes sense

Try changing your loop so that you call findcontrol on the row instead:
for (int i = 1; i <= Table1.Rows.Count - 1; i++)
{
HtmlSelect select = Table1.Rows[i].FindControl("MainContent_selectBoxstatus" + i) as HtmlSelect;
}

sum values which are loaded in gridview

How can I plus all values of one selected row of a gridview in C# asp.net application?
For example I have a gridview in which is only one row. Values of this row are only number. So I want to plus this numbers.
I tried this loop but it writes all gridview numbers(it isn't summing them).
for (int i = 2; i < GridView1.Columns.Count; i++)
{
int x = 0;
x += int.Parse(GridView1.Rows[0].Cells[i].Text);
Response.Write(x.ToString());
}

I think you should approach this from a different perspective. The GridView is just a display control and doesn't 'hold' the data it is displaying. You are trying to use data that it really doesn't contain using a 'screen scrape' approach. You should be looking to the DataSource you bound to the grid in the first place and using the data there.
For example:
List<YourObjectWithTheNumbers> lst = something;
yourGridView.DataSource = lst;
ViewState["YourData"] = lst; // you could use Session instead: Session["YourData"]
So at this point your data is bound and saved for later use so now just update your numbers and rebind to the GridView again:
List<YourObjectWithTheNumbers> lst =
(List<YourObjectWithTheNumbers>)(ViewState["YourData"]);
int rowTotal = 0;
rowTotal += lst[0].Field1;
rowTotal += lst[0].Field2;
//etc...
yourLiteral.Text = rowTotal.ToString();
At this point you are using the actual data, not pulling it out of the grid that should be used for display purposes. It's also more secure in that you can keep the data source securely stored on the server if necessary (don't use ViewState if this is a concern) so that it can't be manipulated.

In HTML GridView render as table , better you can use Jquery to add the values ,
var total=0;
$('#gridview1').find('tr td').each(function(i, td){
var data= parseInt( $(td).val());
total+=data;
});

I created method in which I had loop and it worked !!!!!!!
public int Sum()
{
int z = 0;
int i;
int x = 0;
for (i = 0; i < GridView1.Columns.Count; i++)
{
x += int.Parse(GridView1.Rows[0].Cells[i].Text);
}
return x;
}
It was #N4TKD idea. Thanks to you !!!!

Dynamically creating a grid using lists

Im trying to create a dynamic grid with columns equal to the amount of days in a month (will add that feature later after i get the grid to appear) and rows equal to the amount of objects within the emplist list.
This is my code so far.
Grid dategrid = new Grid();
dategrid.Width = 400;
dategrid.HorizontalAlignment = HorizontalAlignment.Left;
dategrid.VerticalAlignment = VerticalAlignment.Top;
dategrid.ShowGridLines = true;
dategrid.Background = new SolidColorBrush(Colors.DimGray);
List<ColumnDefinition> columnlist = new List<ColumnDefinition>();
List<RowDefinition> rowlist = new List<RowDefinition>();
for (int i = 0; i < 31; i++)
{
columnlist.Add(new ColumnDefinition());
dategrid.ColumnDefinitions.Add(columnlist[i]);
}
for (int i = 0; i < Control.empList.Count; i++)
{
rowlist.Add(new RowDefinition());
dategrid.RowDefinitions.Add(rowlist[i]);
rowlist[i].Height = new GridLength(45);
}
The code compiles, but no grid appears on the form.
I feel like I'm missing something real basic here, but can't for the life of me figure it out.

You're missing dategrid.Bind()

Your code doesn't show you adding the grid to the page anywhere. So far all you have shown is instantiating a building the grid in memory. You need something like gridSpace.controls.add(datagrid) where gridspace is a container on the page. Something like <div id="gridspace" runat="server"></div> (any other container will do...). Or (if this is winforms) to a panel or other container on the form....