Customizing Filter Text for Enum and Bool Columns in RadGridView

Environment

Product Version	Product	Author
2025.2.520	RadGridView for WinForms	Dinko Krastev

Description

I want to customize the automatic filter menu in RadGridView for WinForms in two ways:

1. For columns of type bool, replace "True" and "False" with "Checked" and "Unchecked".
2. For columns of type enum, display the text from their [Description] attribute instead of the raw enum names.

Solution

To achieve this customization, handle the FilterPopupInitialized event of RadGridView and modify the text in the filter menu using the RadTreeView.NodeFormatting event. Below is the implementation:

Customizing Bool Column Filter Text

Use the following code:

this.radGridView1.FilterPopupInitialized += RadGridView1_FilterPopupInitialized;   

private void RadGridView1_FilterPopupInitialized(object sender, FilterPopupInitializedEventArgs e)
{
    if (e.Column.Name == "boolColumn") // Replace with your column name
    {
        RadListFilterPopup radListFilterPopup = e.FilterPopup as RadListFilterPopup;

        if (radListFilterPopup != null)
        {
            radListFilterPopup.MenuTreeElement.TreeView.NodeFormatting -= BoolFormattingHandler;
            radListFilterPopup.MenuTreeElement.TreeView.NodeFormatting += BoolFormattingHandler;
            radListFilterPopup.MenuTreeElement.TreeView.Refresh();
        }
    }
}

private void BoolFormattingHandler(object sender, TreeNodeFormattingEventArgs e)
{
    if (e.Node.Text == "False")
        e.NodeElement.ContentElement.Text = "Unchecked";
    else if (e.Node.Text == "True")
        e.NodeElement.ContentElement.Text = "Checked";
}

Customizing Enum Column Filter Text

For enum values with [Description] attributes, use the following code:

this.radGridView1.FilterPopupInitialized += RadGridView1_FilterPopupInitialized;

private void RadGridView1_FilterPopupInitialized(object sender, FilterPopupInitializedEventArgs e)
{
    if (e.Column.Name == "enumColumn") // Replace with your column name
    {
        RadListFilterPopup radListFilterPopup = e.FilterPopup as RadListFilterPopup;

        if (radListFilterPopup != null)
        {
            radListFilterPopup.MenuTreeElement.TreeView.NodeFormatting -= EnumFormattingHandler;
            radListFilterPopup.MenuTreeElement.TreeView.NodeFormatting += EnumFormattingHandler;
            radListFilterPopup.MenuTreeElement.TreeView.Refresh();
        }
    }
}

private void EnumFormattingHandler(object sender, TreeNodeFormattingEventArgs e)
{
    string description = GetEnumDescription(e.Node.Text);
    if (!string.IsNullOrEmpty(description))
        e.NodeElement.ContentElement.Text = description;
}

private string GetEnumDescription(string enumName)
{
    // Replace YourEnumType with the actual enum type
    var fieldInfo = typeof(YourEnumType).GetField(enumName);
    var attributes = (DescriptionAttribute[])fieldInfo.GetCustomAttributes(typeof(DescriptionAttribute), false);
    return attributes.Length > 0 ? attributes[0].Description : enumName;
}

See Also

• RadGridView Documentation