SqlDataSource.FillAsync(String[]) Method
Populates the SqlDataSource in an asynchronous manner. You can specify which queries to execute in order to populate the data source.
Namespace: DevExpress.DataAccess.Sql
Assembly: DevExpress.DataAccess.v20.2.dll
NuGet Packages: DevExpress.DataAccess, DevExpress.WindowsDesktop.DataAccess
Declaration
Parameters
| Name | Type | Description |
|---|---|---|
| queriesToFill | String[] | Queries to execute in order to populate the data source. |
Returns
| Type | Description |
|---|---|
| Task | A task that populates the data source. |
Remarks
Use this method to populate an SQL data source in an individual task asynchronously. Unlike the Fill() method call, FillAsync does not lock other actions performed concurrently. For instance, the user interface remains operational while the data source is populated.
Call the FillAsync method with the await operator.
The queriesToFill array specifies the names of the queries to execute in order to populate the data source.
All queries listed in the queriesToFill parameter are validated one by one. If any validation errors occur, an AggregateException is thrown with these errors. Use the exception’s InnerExceptions property to access a collection of QueryExecutionException objects (use their InnerException property to access an actual ValidationException).
If the validation succeeds, all listed queries are executed one by one. If any errors occur, an AggregateException is thrown with these errors. Use the exception’s InnerExceptions property to access a collection of QueryExecutionException objects (use their InnerException property to access an actual DevExpress.DataAccess.Native.Sql.SqlExecutionException).
Example
The code sample below creates an SqlDataSource and populates the queryInvoices data member in an asynchronous manner.
using System.Threading;
using System.Threading.Tasks;
using DevExpress.DataAccess;
using DevExpress.DataAccess.Sql;
using DevExpress.DataAccess.ConnectionParameters;
// ...
// Create and configure an SQL data source.
Access97ConnectionParameters connectionParameters = new Access97ConnectionParameters(".\\Data\\nwind.mdb", "", "");
DevExpress.DataAccess.Sql.SqlDataSource dataSource = new DevExpress.DataAccess.Sql.SqlDataSource(connectionParameters);
// Create the "queryInvoices" query that serves as a data member.
CustomSqlQuery queryInvoices = new CustomSqlQuery();
queryInvoices.Name = "queryInvoices";
queryInvoices.Sql = "SELECT OrderID, OrderDate, ShipName, sum(ExtendedPrice) as Total FROM Invoices GROUP BY OrderID,OrderDate,ShipName";
dataSource.Queries.Add(queryInvoices);
report.DataSource = dataSource;
report.DataMember = "queryInvoices";
// Populate the data source.
await dataSource.FillAsync(new string[] { "queryInvoices" });
report.DataSource = dataSource;