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.v24.2.dll

Declaration

C#

public Task FillAsync(
    string[] queriesToFill
)

VB.NET

Public Function FillAsync(
    queriesToFill As String()
) As Task

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 queryCategoriesAllFields data member in an asynchronous manner.

C#

using DevExpress.DataAccess.ConnectionParameters;
using DevExpress.DataAccess.Sql;
SqlDataSource DataSource { get; set; }
public void CreateSqlDataSource()
{
    MsSqlConnectionParameters connectionParameters = new MsSqlConnectionParameters(
        ".", "NorthWind", null, null, MsSqlAuthorizationType.Windows);
    var sqlDataSource = new SqlDataSource(connectionParameters) { Name = "Sql_Categories" };
    var categoriesQuery = SelectQueryFluentBuilder
        .AddTable("Categories")
        .SelectAllColumnsFromTable()
        .Build("Categories");
    categoriesQuery.Name = "queryCategoriesAllFields";
    sqlDataSource.Queries.Add(categoriesQuery);
    sqlDataSource.RebuildResultSchema();
    DataSource = sqlDataSource;
}
async void FillDataSourceAsync()
{
    await DataSource.FillAsync(new string[] { "queryCategoriesAllFields" });
}

VB.NET

Imports DevExpress.DataAccess.ConnectionParameters
Imports DevExpress.DataAccess.Sql
Private Property DataSource() As SqlDataSource
Public Sub CreateSqlDataSource()
    Dim connectionParameters As New MsSqlConnectionParameters(
        ".", "NorthWind", Nothing, Nothing, MsSqlAuthorizationType.Windows)
    Dim sqlDataSource = New SqlDataSource(connectionParameters) With {.Name = "Sql_Categories"}
    Dim categoriesQuery = SelectQueryFluentBuilder.
        AddTable("Categories").
        SelectAllColumnsFromTable().
        Build("Categories")
    categoriesQuery.Name = "queryCategoriesAllFields"
    sqlDataSource.Queries.Add(categoriesQuery)
    sqlDataSource.RebuildResultSchema()
    DataSource = sqlDataSource
End Sub
Async Sub FillDataSourceAsync()
    Await DataSource.FillAsync(New String() {"queryCategoriesAllFields"})
End Sub