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Multi select combobox column

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GridView

This is a migrated thread and some comments may be shown as answers.

20 Answers, 1 is accepted

answered on 01 Sep 2009, 08:24 AM

Hello nayenez,

Basically you have to add GridViewMultiComboBoxColumn and set its DataSource, ValueMember, and DisplayMember properties. Here is a sample:

    
            GridViewMultiComboBoxColumn multiComboColumn = new GridViewMultiComboBoxColumn("Items", ""); 
        
            multiComboColumn.DataSource = items; 
        
            multiComboColumn.ValueMember = "ID"; 
        
            multiComboColumn.DisplayMember = "Name"; 
        
            this.radGridView1.Columns.Add(multiComboColumn);

If you have any other questions, don't hesitate to contact us back.

Sincerely yours,
Jack
the Telerik team

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answered on 01 Sep 2009, 01:15 PM

multiselectcombobox.zip

Hello nayenez,

I apologize for this mistake. Now I understand what you want to achieve. Yes, you can use the code from this KB article as a base for a multi-select combo box column. Basically you should create a custom editor by inheriting the standard RadComboBoxEditor. You can find more information regarding this behavior in our online documentation. Please check also "GridView -> Custom Editors" example in our demo application.

Handle EditorRequired event to replace the default editor in RadGridView:

    
            void radGridView1_EditorRequired(object sender, EditorRequiredEventArgs e) 
        
            { 
        
                if (e.EditorType == typeof(RadComboBoxEditor)) 
        
                { 
        
                    e.EditorType = typeof(CustomComboBoxEditor); 
        
                } 
        
            }

You can use a standard combobox column to host the editor:

    
            GridViewLookUpColumn combo = new GridViewLookUpColumn("Items"); 
        
            combo.DataType = typeof(string);             
        
            this.radGridView1.Columns.Add(combo);

Find the rest of the code in the attached C# file. I hope it helps. Should you have any questions, don't hesitate to ask.

Sincerely yours,
Jack
the Telerik team

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answered on 21 Oct 2013, 03:11 PM

Hi Harry,

Thank you for contacting Telerik support.

If I understand you correctly you are trying to combine the solution from this article with this one. In this case you can use the first example and bind the grid to a datasource like this:

public Form1()

{

InitializeComponent();

DataTable t = new DataTable();

DataTable s = new DataTable();

s.Columns.Add("MutiSelect column", typeof(int[]));

s.Rows.Add(new int[] { 9, 6, 10 });

s.Rows.Add(new int[] { 5, 1, 3 });

s.Rows.Add(new int[] { 8, 7 });

s.Rows.Add(new int[] { 4, 2, 1 });

t.Columns.Add("ID", typeof(int));

t.Columns.Add("Name", typeof(string));

t.Rows.Add(1, "one");

t.Rows.Add(2, "two");

t.Rows.Add(3, "three");

t.Rows.Add(4, "four");

t.Rows.Add(5, "five");

t.Rows.Add(6, "six");

t.Rows.Add(7, "seven");

t.Rows.Add(8, "eight");

t.Rows.Add(9, "nine");

t.Rows.Add(10, "ten");

radGridView1.AutoGenerateColumns = false;

radGridView1.DataSource = s;

CustomColumn col = new CustomColumn("MutiSelect column");

col.DataSource = t;

col.DisplayMember = "Name";

col.ValueMember = "ID";

radGridView1.Columns.Add(col);

}

I hope this helps. Should you have any other questions do not hesitate to ask.

Regards,
Dimitar
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answered on 05 Nov 2014, 10:52 AM

Hello Tom,

Thank you for writing.

It appears that there is a problem in our documentation page and the code is not listed there (we will fix this as soon as possible). Nevertheless the code for the editor should look like this:

public class GridViewCheckedDropDownListEditor : RadCheckedDropDownListElement

{

public override object Value

{

get

{

return this.Text;

}

set

{

this.Text = value + "";

}

Please let me know if there is something else I can help you with.

Regards,
Dimitar
Telerik

Check out the Telerik Platform - the only platform that combines a rich set of UI tools with powerful cloud services to develop web, hybrid and native mobile apps.

answered on 05 Jan 2015, 04:27 PM

238957.zip

Hi Tassos,

Thank you for writing back.

I have created a small sample where you can see how to convert the integer values to strings and vice versa. Please note that when you are not in edit mode the cell is always displaying text (you can display anything you want regardless of the value). This means that the value should be converted when the user begins or ends editing a particular cell. This is done by overriding the Value property of the editor - so when the editor is initialized the value is converted to string and when the user ends the edit, the value is converted back to integer.

I hope this will be useful.

Regards,
Dimitar
Telerik

Check out the Telerik Platform - the only platform that combines a rich set of UI tools with powerful cloud services to develop web, hybrid and native mobile apps.

answered on 08 Jun 2020, 04:58 AM

Hello, Song Wan,

I suppose that you are using the latest version of the Telerik UI for WinForms suite.

I would like to note that RadComboBox has been replaced by RadDropDownList. RadGridView now uses a RadDropDownListEditor: https://docs.telerik.com/devtools/winforms/controls/gridview/editors/default-editors

In case you want to allow multiple selection in the grid's editor, the following help article demonstrates how adopt RadCheckedDropDownList as an editor: https://docs.telerik.com/devtools/winforms/controls/dropdown-listcontrol-and-checkeddropdownlist/checkeddropdownlist/how-to/use-as-radgridview-editor

I hope this information helps. If you need any further assistance please don't hesitate to contact me.

Regards,
Dess | Tech Support Engineer, Sr.
Progress Telerik

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Multi select combobox column

20 Answers, 1 is accepted