FileManagerDetailsViewCustomColumnHeaderFilterFillItemsEventArgs.AddShowAll() Method

Adds the All item to the header filter of a custom column.

Namespace: DevExpress.Web

Assembly: DevExpress.Web.v24.2.dll

Declaration

C#

public void AddShowAll()

VB.NET

Public Sub AddShowAll

Remarks

By default, the header filter displays a list of available column cell values and All, Blanks, and Non blanks items. You can use the ASPxFileManager.DetailsViewCustomColumnHeaderFilterFillItems to provide custom header filter items.

To clear the default items, use the Clear method. Then, you can use the AddShowAll method to add the All item to the header filter.

To learn more about custom columns, see the Custom Columns topic.

Example

This code sample demonstrates how to populate a custom column’s header filter with custom items. For this purpose, the ASPxFileManager.DetailsViewCustomColumnHeaderFilterFillItems event is handled.

WebForm1.aspx

<dx:ASPxFileManager ID="ASPxFileManager1" runat="server" Width="800px" Height="400px" OnDetailsViewCustomColumnDisplayText="ASPxFileManager1_DetailsViewCustomColumnDisplayText" OnDetailsViewCustomColumnHeaderFilterFillItems="ASPxFileManager1_DetailsViewCustomColumnHeaderFilterFillItems">
    <Settings RootFolder="~\Files\" ThumbnailFolder="~\Thumb\" />
    <SettingsFileList View="Details">
        <DetailsViewSettings>
            <Columns>
                <dx:FileManagerDetailsColumn Caption=" " FileInfoType="Thumbnail" VisibleIndex="0">
                </dx:FileManagerDetailsColumn>
                <dx:FileManagerDetailsColumn Caption="Name" VisibleIndex="1">
                </dx:FileManagerDetailsColumn>
                <dx:FileManagerDetailsCustomColumn Caption="Extension" Name="FileExtension" VisibleIndex="2" ShowHeaderFilterButton="True">
                </dx:FileManagerDetailsCustomColumn>
            </Columns>
        </DetailsViewSettings>
    </SettingsFileList>
</dx:ASPxFileManager>

WebForm1.aspx.cs

protected void ASPxFileManager1_DetailsViewCustomColumnHeaderFilterFillItems(object source, DevExpress.Web.FileManagerDetailsViewCustomColumnHeaderFilterFillItemsEventArgs e) {
    if (e.Column.Name != "FileExtension") return;
    e.Values.Clear();
    e.AddShowAll();
    e.AddValue("Media Files", string.Empty, "FileExtension = 'avi' or FileExtension = 'mp3' or FileExtension = 'jpg'");
    e.AddValue("Documents", string.Empty, "FileExtension = 'txt' or FileExtension = 'rtf' or FileExtension = 'xml'");
    e.AddValue("Photos", "jpg");
}

WebForm1.aspx.vb

Protected Sub ASPxFileManager1_DetailsViewCustomColumnHeaderFilterFillItems(ByVal source As Object, ByVal e As DevExpress.Web.FileManagerDetailsViewCustomColumnHeaderFilterFillItemsEventArgs)
    If e.Column.Name <> "FileExtension" Then
        Return
    End If
    e.Values.Clear()
    e.AddShowAll()
    e.AddValue("Media Files", String.Empty, "FileExtension = 'avi' or FileExtension = 'mp3' or FileExtension = 'jpg'")
    e.AddValue("Documents", String.Empty, "FileExtension = 'txt' or FileExtension = 'rtf' or FileExtension = 'xml'")
    e.AddValue("Photos", "jpg")
End Sub