Run the attached sample project on a monitor with 100% DPI scaling. Then, try moving the form to the second monitor with 150% DPI scaling. You will notice that the following error occurs:

Workaround: instead of using a RadTextBoxControlElement in the custom cell, feel free to use a RadTextBoxElement. However, please have in mind that RadTextBoxElement hosts the MS TextBox and using controls in grid cells may slow down the scrolling and will cause visual glitches as they do not support clipping.

ArgumentOutOfRangeException is thrown when the control is auto-sized (AutoSize = true) and we try to select all (MultiSelect = true with CellSelect) rows by clicking and moving the mouse. 

As a workaround, we could set the MaximumSize property of the RadGridView.

this.radGridView1.MaximumSize = new Size(1000,1000);

C#. net core 6, winforms application, TekerikNuGet3 package source, UI.for.WinForms.AllControls.NetCore package 2022.2.622

I am trying to export selected cells from a RadGridView as a csv file.

When using "var exporter = new ExportToCSV(Dgv)" then "exporter.RunExport(fileName);" writes the csv file correctly. It exports every cell.

It doesn't support exporting selections so I wrote a function to do this . The one below is what I used in my project to test what I was doing. It initially writes the csv to a worksheet and wrote that using formatprovider to file, then I just created a stringbuilder adding quotes and appended that to the file afterwards.

Writing the worksheet, the csv values haven't been quoted, plus number fields have had leading zeros removed which proves to be a problem when telephone numbers are stored in a field.

So I googled and found the Settings property which is there to set csv options. But they are private, not public therefore I can't set up the csv propertly.

private void radButton1_Click(object sender, EventArgs e)
  {

    var workbook = new Workbook();
    var worksheet = workbook.Worksheets.Add();

    var rowIndex = 0;
    var columnIndex = -1;
    var sb = new StringBuilder();
    var prevColumnIndex = -1;

    // ForEach cell are accessed vertically then horizontally.
    foreach (var cell in Dgv.SelectedCells)
    {
      // Cell is included in selection even if it's invisible
      // so check visibility and ignore if it isnt
      if (!cell.ColumnInfo.IsVisible) continue;

      // At bottom of column, rownum will change. Watch for this
      // and reset x and y values
      var rowNum = cell.RowInfo.Index;
      if (rowNum != prevColumnIndex)
      {
        prevColumnIndex = rowNum;
        rowIndex = 0;
        columnIndex++;
        sb.AppendLine("");
      }
      else if (!string.IsNullOrEmpty(sb.ToString()))
        sb.Append(",");

      var value = cell.Value;
      worksheet.Cells[columnIndex, rowIndex++ ].SetValue(value.ToString());
      sb.Append($"\"{value.ToString()}\"");
    }

    var fileName = @"C:\temp\SampleFile.csv";

    IWorkbookFormatProvider formatProvider = new CsvFormatProvider();
    using var output = new FileStream(fileName, FileMode.Create);
    formatProvider.Export(workbook, output);
    output.Close();

    // Write contents of sb to the file for comparison sake
    File.AppendAllText(fileName, sb.ToString());

  }

Run the attached project on a monitor with 100% DPI scaling and open the Excel-like filter popup:

100%:

After moving the form to the second monitor with 150% DPI scaling, the filter popup is not OK:

150%:

The popup is smaller and smaller with each next opening (see the attached gif file) at 150%. If you decide to move back the form on the monitor with 100% DPI scaling, the filter popup is not scaled properly.

When the columns are auto-generated, the way to modify the columns is to use the Columns collection. We could expose an event that will be called when the columns are auto-generating. From the event arguments, we could get the newly created column and replace with if needed or modify it. Similar to the CreateRow event of the control.

Use the following code snippet:

        public RadForm1()
        {
            InitializeComponent();
            this.radGridView1.Columns.Add("TextColumn");
            this.radGridView1.AutoSizeColumnsMode = GridViewAutoSizeColumnsMode.Fill;

            for (int i = 0; i < 30; i++)
            {
                this.radGridView1.Rows.Add(Guid.NewGuid().ToString());
            }
            this.radGridView1.CellValidating += radGridView1_CellValidating;

            this.radGridView1.EditorManager.CloseEditorWhenValidationFails = false;
        }

        private void radGridView1_CellValidating(object sender, CellValidatingEventArgs e)
        {
            if (e.Value == null || e.Value == "")
            {
                e.Cancel = true;
                RadMessageBox.Show("Value can't be empty!");
            }
        }

Steps:

1. Clear the value of a cell

2. While the editor is active with an empty value, click the vertical scrollbar to trigger scrolling.

Actual: the scrolling is performed and the editor is closed with the previous value no matter when the validation fails and the CloseEditorWhenValidationFails property is set to false.

Expected: the scrolling should be blocked if the validation fails. We should offer the same behavior when scrolling with the mouse wheel, clicking another cell or clicking the vertical scrollbar (or any of its elements).

Workaround: 

        public class MyGrid : RadGridView
        {
            public override string ThemeClassName
            {
                get
                {
                    return typeof(RadGridView).FullName;
                }
            }

            protected override void OnMouseDown(MouseEventArgs e)
            {
                RadScrollBarElement scrollBarAtPoint = GetScrollbarElementAtPoint<RadScrollBarElement>(this.GridViewElement.ElementTree, e.Location) as RadScrollBarElement;
                GridViewEditManager editManager = this.EditorManager;
                if (scrollBarAtPoint != null && this.ActiveEditor != null && !editManager.CloseEditorWhenValidationFails)
                {
                    bool isClosed = editManager.CloseEditor();
                    if (!isClosed)
                    {
                        return;
                    }
                }
                base.OnMouseDown(e);
            }

            internal T GetScrollbarElementAtPoint<T>(RadElementTree componentTree, Point point) where T : RadElement
            {
                if (componentTree != null)
                {
                    RadElement elementUnderMouse = componentTree.GetElementAtPoint(point);

                    while (elementUnderMouse != null)
                    {
                        T item = elementUnderMouse as T;

                        if (item != null)
                        {
                            return item;
                        }

                        elementUnderMouse = elementUnderMouse.Parent;
                    }
                }

                return null;
            }
        }

Steps to reproduce:

1. Run the sample project and select a row inside the grid

2. Press Ctrl+B

The following error occur:

Workaround: set the EnableFastScrolling property to false.

When we have column groups with equal names, the Spread Export is not exporting the groups correctly. This will lead to incorrectly merged cells.

A possible workaround is to assure that all column groups have different strings for their Text property.

Use the following code: 

        public RadForm1()
        {
            InitializeComponent();

            DataTable dt = new DataTable();
            dt.Columns.Add("Id");
            dt.Columns.Add("Name");
            for (int i = 0; i < 10; i++)
            {
                dt.Rows.Add(i, "Item" + i); 
            }
            this.radGridView1.DataSource = dt; 
            this.radGridView1.AutoSizeColumnsMode = GridViewAutoSizeColumnsMode.Fill; 
             
            this.radGridView1.CellValidating += radGridView1_CellValidating;
        }

        private void radGridView1_CellValidating(object sender, CellValidatingEventArgs e)
        {
            if (e.Column.Index == 0 && e.ActiveEditor != null && e.Value + "" == "1")
            { 
                e.Cancel = true;
                RadMessageBox.Show("IncorrectValue");
            }
        }

Follow the steps:

1. Scroll to the last row.

2. Enter value "1" in the first cell of the last row

3. Click the area above the scrollbar's thumb to trigger scrolling to the top. You will notice that the message box will be shown and the view will be scrolled. Once the message is closed, the error occurs.

Workaround: 

        public class CustomGridView : RadGridView
        {
            public override string ThemeClassName  
            { 
                get 
                { 
                    return typeof(RadGridView).FullName;  
                }
            }

            protected override void OnMouseDown(MouseEventArgs e)
            {
             RadScrollBarElement scrollbar=   this.GridViewElement.ElementTree.GetElementAtPoint ( e.Location) as RadScrollBarElement;
             if (scrollbar!=null && this.IsInEditMode)
             {
                    this.EditorManager.CloseEditorWhenValidationFails = false;
                    this.EditorManager.CloseEditor();
                    return;
             }
                base.OnMouseDown(e);
            }
        }

I might be missing something, but I have Hyperlinks in a column in my RadDatGridView.

I tried searching for a Support document explaining this, but didn't find any.

When the grid is exported to excel all data is coming across, but the column with hyperlink is not

a hyperlink in Excel.

Below is sample of the code used to make the "HyperLink" column in my grid.

                radGridView1.DataSource = dtResults;
                radGridView1.Columns.Remove("Path");
                GridViewHyperlinkColumn col = new GridViewHyperlinkColumn();
                radGridView1.Columns.Insert(5, col);
                col.Width = 200;
                col.FieldName = "Path";
                col.HeaderText = "Path";
                col.Name = "Path";

Coded used to do the Export....

               GridViewSpreadExport spreadExporter = new GridViewSpreadExport(this.radGridView1);
                spreadExporter.ExportVisualSettings = true;
                SpreadExportRenderer exportRenderer = new SpreadExportRenderer();

                spreadExporter.RunExport(filename, exportRenderer);

Thanks.

Roger

Hi

I just found a strange issue using the latest bits of the Telerik RadGridView. 

I have a grid that contains ColumnGroupsViewDefinition. Inside one of the group, one of the column is a GridViewComboBoxColumn.

The grid shows correctly on the screen.

If I try to export it using GridViewSpreadExport, I get an exception saying "input string was not in a correct format".

The export works fine if:

-I don't have groups

-I export to HTML using ExportToHTML

-I export to HTML using ExportToCSV

Any help please?

Run the attached project and click List then Export.

Expected:

Actual:

Workaround:

    Private Sub RadButton2_Click(sender As Object, e As EventArgs) Handles RadButton2.Click
        Dim spreadExporter As GridViewSpreadExport = New GridViewSpreadExport(gvAssetSchedule)
        AddHandler spreadExporter.CellFormatting, AddressOf spreadExporter_CellFormatting
        Dim exportRenderer As New SpreadExportRenderer()
        spreadExporter.ExportVisualSettings = True
        Dim filename = "..\..\export" & DateTime.Now.ToLongTimeString().Replace(":", "_") & ".xlsx"
        spreadExporter.RunExport(filename, exportRenderer)
        Process.Start(filename)
    End Sub

    Private Sub spreadExporter_CellFormatting(sender As Object, e As Telerik.WinControls.Export.CellFormattingEventArgs)
        If e.GridCellInfo Is Nothing Then
            Dim selection As CellSelection = e.CellSelection
            Dim range As CellRange = selection.CellRanges(0)
            Dim val = selection.Worksheet.Cells(range.FromIndex.RowIndex, range.FromIndex.ColumnIndex).GetValue()
            Dim format As New CellValueFormat("@")
            selection.Worksheet.Cells(range.FromIndex.RowIndex, range.FromIndex.ColumnIndex).SetFormat(format)
            Dim dt As New DateTime(1900, 1, 1)
            Dim parsedDays = 0
            If Integer.TryParse(val.Value.RawValue, parsedDays) Then
                dt = dt.AddDays(parsedDays)
                selection.Worksheet.Cells(range.FromIndex.RowIndex, range.FromIndex.ColumnIndex).SetValue(dt.Year & "-" & MonthName(dt.Month))
            End If
        End If
    End Sub

Please refer to the below gif file. You will notice that the drop row line is shown only when dropping in the same grip but not when dropping on another grid:

Workaround: use the project in the following forum post: https://www.telerik.com/forums/preview-drop---drag-drop-between-gridview#5477699