Virtual Sources Limitations

• Apr 01, 2022
• 2 minutes to read

Sort Operations

Sort operations are disabled.

Do the following to enable sort operations:

1. Use the GridControl‘s sort options (returned by the FetchEventArgsBase.SortOrder property) during the fetch operation.
2. Set the ColumnBase.AllowSorting property to true to allow users to sort the GridControl‘s rows.

Refer to the following help topic for more information: Enable Sort Operations.

Filter Operations

Filter operations are disabled.

Do the following to enable filter operations:

1. Use the GridControl‘s filter (returned by the FetchEventArgsBase.Filter property) during the fetch operation.
2. Set the ColumnBase.AllowFiltering property to true to allow users to filter the GridControl‘s rows.

3. Use the following properties to specify filters that the GridControl‘s column supports:

   Property	Description
   ColumnBase.AllowedUnaryFilters	Gets or sets unary filters that the GridControl‘s column supports.
   ColumnBase.AllowedBinaryFilters	Gets or sets binary filters that the GridControl‘s column supports.
   ColumnBase.AllowedAnyOfFilters	Gets or sets any of filters that the GridControl‘s column supports.
   ColumnBase.AllowedDateTimeFilters	Gets or sets date-time filters that the GridControl‘s column supports.
   ColumnBase.AllowedBetweenFilters	Gets or sets between filters that the GridControl‘s column supports.

Refer to the following help topic for more information: Enable Filter Operations.

Total Summaries

Total Summaries are disabled.

Do the following to show summaries:

• Handle the InfiniteAsyncSource.GetTotalSummaries event to get total summaries.
• Specify the GridControl.TotalSummary property to display total summaries in the GridControl.

Refer to the following help topic for more information: Display Summaries.

Group Operations

Group operations are not supported.

Edit Operations

Edit operations are disabled.

Unbound Columns

• You can display unbound columns.
• You cannot use unbound columns to sort and group data or apply data summaries.
• If you calculate values on the data source side by multiple columns, use the VirtualSourceBase.CustomProperties property to specify custom PropertyDescriptors.

Conditional Formatting

You can use the FormatCondition conditional formats only.

Print and Export

The GridControl prints and exports only loaded rows.

Selection

The DataControlBase.SelectAll method selects only loaded rows.

Clipboard Operations

• You can copy grid data to the clipboard.
• Paste operations are not supported.