Manage Timeout Limit

• Feb 23, 2024
• 4 minutes to read

The Web Dashboard has a 300-second time limit to execute a query. When a query timeout expires, the query execution stops and an exception occurs.

You can extend or shorten the time limit in code. The ConnectionOptions.DbCommandTimeout property specifies how many seconds the Web Dashboard waits for a query to execute. The time set in the property is stored in a dashboard definition after a successful connection to a database.

Specify Timeout for a Data Source Created in the UI

The examples below override the dashboard load procedure and set the time limit (up to 600 seconds) for an SQL Data Source query in a dashboard. Use the following code if you create a new data source based on the existing data connection in the UI:

ASP.NET MVC

DashboardConfig.cs

using System.Web.Routing;
using DevExpress.DashboardCommon;
using DevExpress.DashboardWeb;
using DevExpress.DashboardWeb.Mvc;
using System.Linq;

namespace MvcDashboardDataSources {
    public static class DashboardConfig {
        public static void RegisterService(RouteCollection routes){
            routes.MapDashboardRoute("dashboardControl", "DefaultDashboard");
            DashboardConfigurator.Default.SetDashboardStorage(new DashboardFileStorageEx("~/App_Data/Dashboards"));
            DashboardConfigurator.Default.SetConnectionStringsProvider(new DevExpress.DataAccess.Web.ConfigFileConnectionStringsProvider());
        }
        public class DashboardFileStorageEx : DashboardFileStorage {
            public DashboardFileStorageEx(string workingDirectory) : base(workingDirectory) { }
            protected override System.Xml.Linq.XDocument LoadDashboard(string dashboardID){
                var dashboardXML = base.LoadDashboard(dashboardID);
                Dashboard d = new Dashboard();
                d.LoadFromXDocument(dashboardXML);
                foreach (var ds in d.DataSources.OfType<DashboardSqlDataSource>())
                    ds.ConnectionOptions.CommandTimeout = 600;
                return d.SaveToXDocument();
            }
        }
    }
} 

DashboardConfig.vb

Imports System.Web.Routing
Imports DevExpress.DashboardCommon
Imports DevExpress.DashboardWeb
Imports DevExpress.DashboardWeb.Mvc
Imports System.Linq

Namespace MvcDashboardDataSources
    Public Module DashboardConfig
        Public Sub RegisterService(ByVal routes As RouteCollection)
            routes.MapDashboardRoute("dashboardControl", "DefaultDashboard")
            DashboardConfigurator.Default.SetDashboardStorage(New DashboardFileStorageEx("~/App_Data/Dashboards"))
            DashboardConfigurator.Default.SetConnectionStringsProvider(New DevExpress.DataAccess.Web.ConfigFileConnectionStringsProvider())
        End Sub
        Public Class DashboardFileStorageEx
            Inherits DashboardFileStorage

            Public Sub New(ByVal workingDirectory As String)
                MyBase.New(workingDirectory)
            End Sub
            Protected Overrides Function LoadDashboard(ByVal dashboardID As String) As System.Xml.Linq.XDocument
                Dim dashboardXML = MyBase.LoadDashboard(dashboardID)
                Dim d As New Dashboard()
                d.LoadFromXDocument(dashboardXML)
                For Each ds In d.DataSources.OfType(Of DashboardSqlDataSource)()
                    ds.ConnectionOptions.CommandTimeout = 600
                Next ds
                Return d.SaveToXDocument()
            End Function
        End Class
    End Module
End Namespace

ASP.NET Core

Program.cs

using DevExpress.DashboardAspNetCore;
using DevExpress.DashboardCommon;
using DevExpress.DashboardWeb;
using Microsoft.Extensions.FileProviders;

var builder = WebApplication.CreateBuilder(args);
// ...
builder.Services.AddScoped<DashboardConfigurator>((IServiceProvider serviceProvider) => {
    DashboardConfigurator configurator = new DashboardConfigurator();
    configurator.SetConnectionStringsProvider(new DashboardConnectionStringsProvider(configuration));
    configurator.SetDashboardStorage(new DashboardFileStorageEx(fileProvider.GetFileInfo("Data/Dashboards").PhysicalPath));
    return configurator;
});
// ...
var app = builder.Build();
// ...
app.Run();
// ...
public class DashboardFileStorageEx : DashboardFileStorage {
    public DashboardFileStorageEx(string workingDirectory) : base(workingDirectory) { }
    protected override System.Xml.Linq.XDocument LoadDashboard(string dashboardID) {
        var dashboardXML = base.LoadDashboard(dashboardID);
        Dashboard d = new Dashboard();
        d.LoadFromXDocument(dashboardXML);
        foreach (var ds in d.DataSources.OfType<DashboardSqlDataSource>())
            ds.ConnectionOptions.CommandTimeout = 600;
        return d.SaveToXDocument();
    }
}

Specify Timeout for a Data Source Created in Code

The examples below show how to extend the timeout. The DbCommandTimeout property sets the time limit (up to 600 seconds) for the registered SQL Data Source query. Use the following code if you connect a dashboard to a predefined data source:

ASP.NET MVC

DashboardConfig.cs

using DevExpress.DashboardCommon;
using DevExpress.DashboardWeb;
using DevExpress.DashboardWeb.Mvc;
using DevExpress.DataAccess.Sql;
using System.Web.Routing;

Namespace MvcDashboardDataSources {
    public static class DashboardConfig {
        public static void RegisterService(RouteCollection routes) {
            routes.MapDashboardRoute("dashboardControl", "DefaultDashboard");
            DashboardConfigurator.Default.SetConnectionStringsProvider(new DevExpress.DataAccess.Web.ConfigFileConnectionStringsProvider());
            DashboardConfigurator.Default.SetDataSourceStorage(CreateDataSourceStorage());     
        }
        public static DataSourceInMemoryStorage CreateDataSourceStorage(){
        DataSourceInMemoryStorage dataSourceStorage = new DataSourceInMemoryStorage();

        // Registers an SQL data source.
        DashboardSqlDataSource sqlDataSource = new DashboardSqlDataSource("SQL Data Source", "NWindConnectionString");
        SelectQuery query = SelectQueryFluentBuilder
            .AddTable("SalesPerson")
            .SelectAllColumnsFromTable()
            .Build("Sales Person");
        sqlDataSource.Queries.Add(query);
        sqlDataSource.ConnectionOptions.DbCommandTimeout = 600;
        dataSourceStorage.RegisterDataSource("sqlDataSource", sqlDataSource.SaveToXml());
        return dataSourceStorage;
        }
    }
}

DashboardConfig.vb

Imports DevExpress.DashboardCommon
Imports DevExpress.DashboardWeb
Imports DevExpress.DashboardWeb.Mvc
Imports DevExpress.DataAccess.Sql
Imports System.Web.Routing

Namespace MvcDashboardDataSources
    Public Module DashboardConfig
        Public Sub RegisterService(ByVal routes As RouteCollection)
            routes.MapDashboardRoute("dashboardControl", "DefaultDashboard")
            DashboardConfigurator.Default.SetConnectionStringsProvider(New DevExpress.DataAccess.Web.ConfigFileConnectionStringsProvider())
            DashboardConfigurator.Default.SetDataSourceStorage(CreateDataSourceStorage())
        End Sub
        Public Function CreateDataSourceStorage() As DataSourceInMemoryStorage
            Dim dataSourceStorage As New DataSourceInMemoryStorage()

            ' Registers an SQL data source.
            Dim sqlDataSource As New DashboardSqlDataSource("SQL Data Source", "NWindConnectionString")
            Dim query As SelectQuery = SelectQueryFluentBuilder.AddTable("SalesPerson").SelectAllColumnsFromTable().Build("Sales Person")
            sqlDataSource.Queries.Add(query)
            sqlDataSource.ConnectionOptions.DbCommandTimeout = 600
            dataSourceStorage.RegisterDataSource("sqlDataSource", sqlDataSource.SaveToXml())
            Return dataSourceStorage
        End Function
    End Module
End Namespace

ASP.NET Core

Program.cs

using DevExpress.DashboardAspNetCore;
using DevExpress.DashboardCommon;
using DevExpress.DashboardWeb;
using Microsoft.Extensions.FileProviders;

var builder = WebApplication.CreateBuilder(args);

builder.Services.AddScoped<DashboardConfigurator>((IServiceProvider serviceProvider) => {
    DashboardConfigurator configurator = new DashboardConfigurator();
    configurator.SetConnectionStringsProvider(new DashboardConnectionStringsProvider(configuration));
    DataSourceInMemoryStorage dataSourceStorage = new DataSourceInMemoryStorage();

    // Registers an SQL data source.
    DashboardSqlDataSource sqlDataSource = new DashboardSqlDataSource("SQL Data Source", "NWindConnectionString");
    sqlDataSource.DataProcessingMode = DataProcessingMode.Client;
    SelectQuery query = SelectQueryFluentBuilder
        .AddTable("Categories")
        .Join("Products", "CategoryID")
        .SelectAllColumns()
        .Build("Products_Categories");
    sqlDataSource.Queries.Add(query);
    sqlDataSource.ConnectionOptions.DbCommandTimeout = 600;
    dataSourceStorage.RegisterDataSource("sqlDataSource", sqlDataSource.SaveToXml());
    configurator.SetDataSourceStorage(dataSourceStorage);

    return configurator;
});

var app = builder.Build();