SelectQuery.GroupFilterString Property
Specifies the filter criteria to add to the current SelectQuery containing grouped/aggregated columns.
Namespace: DevExpress.DataAccess.Sql
Assembly: DevExpress.DataAccess.v23.2.dll
NuGet Packages: DevExpress.DataAccess, DevExpress.Win.PivotGrid, DevExpress.Win.TreeMap
Declaration
[DefaultValue(null)]
[LocalizableCategory(DataAccessStringId.QueryPropertyGridTableSelectionCategoryName)]
public string GroupFilterString { get; set; }Property Value
| Type | Default | Description |
|---|---|---|
| String | null | A String value. |
Remarks
The GroupFilterString property allows you to filter the result set returned by SelectQuery if it contains grouped/aggregated columns. For example, the following query will return only categories that contain a specific number of products.
//...
SelectQuery selectQuery1 = new SelectQuery("MyQuery")
.AddTable("Products")
.SelectColumn("ProductID", AggregationType.Count, "ProductsCount")
.SelectColumn("CategoryID")
.GroupBy("CategoryID");
selectQuery1.GroupFilterString = "[ProductsCount] > 5";
To pass a QueryParameter (which can be accessed using the SqlQuery.Parameters property) to the filter string, precede the parameter name with the ? sign.
//...
QueryParameter queryParam1 = new QueryParameter("Parameter1", typeof(Int32), 200);
selectQuery1.Parameters.Add(queryParam1);
selectQuery1.GroupFilterString = "[TotalStock] > ?Parameter1";