FileManagerDetailsViewCustomColumnHeaderFilterFillItemsEventArgs.AddShowAll() Method
Adds the All item to the header filter of a custom column.
Namespace: DevExpress.Web
Assembly: DevExpress.Web.v23.2.dll
NuGet Package: DevExpress.Web
Declaration
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.
<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>
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");
}