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Programming Introduction / Tutorial / Web Reporting Overview / Use of the Web Report Viewer
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    Use of the Web Report Viewer
    In This Topic

    The Web Report Viewer supports all common browser types. Thus, it can be used on clients with different operating systems. It allows interactive input through drilldown and report parameters.


    Important Hint

    the objects defined in the Designer and their properties cannot always be fully transferred to any export format. The Web Report Viewer uses the List & Label XHTML/CSS Export module internally for displaying reports. For this reason, the limitations of the XHTML/CSS Export module also apply directly to the Web Report Viewer.


    Integration - Create new Controller

    Then create a new controller as usual - in the following the name MyWebReportViewerController is used as an example. Derive the controller from the WebReportViewerController class:

    public class MyWebReportViewerController : WebReportViewerController
    Public Class MyWebReportViewerController
            Inherits WebReportViewerController


    Integration - Override important Methods

    Then implement the two abstract methods OnProvideListLabel and OnProvideRepository. Pass your List & Label instance with matching data source and temporary export path repectively the Repository to be used in the respective arguments provided.

    public override void OnProvideListLabel(ProvideListLabelContext provideListLabelContext)
        // Create List & Label object
        ListLabel ll = new ListLabel();
        ll.LicensingInfo = "<ToDo: insert your license here>";
        // Define datasource
        var dataSource = GetDataProvider(provideListLabelContext.RepositoryItemId);
        ll.DataSource = dataSource;
        // The Web Report Viewer requires a directory for temporary files. Some minutes after a Web Report Viewer is closed, these files will be deleted automatically
        provideListLabelContext.ExportPath = Server.MapPath("~/App_Data/TempFiles");
        // Return configured List & Label object
        provideListLabelContext.NewInstance = ll;
    public override void OnProvideRepository(ProvideRepositoryContext provideFileRepositoryContext)
        provideFileRepositoryContext.FileRepository = DefaultSettings.GetRepository();
    Public Overrides Sub OnProvideListLabel(ByVal provideListLabelContext As ProvideListLabelContext)
        ' Create List & Label object
        Dim ll As ListLabel = New ListLabel()
        ll.LicensingInfo = "<ToDo: insert your license here>"
        ' Define datasource
        Dim dataSource = GetDataProvider(provideListLabelContext.RepositoryItemId)
        ll.DataSource = dataSource
        ' The Web Report Viewer requires a directory for temporary files. Some minutes after a Web Report Viewer is closed, these files will be deleted automatically
        provideListLabelContext.ExportPath = Server.MapPath("~/App_Data/TempFiles")
        ' Return configured List & Label object
        provideListLabelContext.NewInstance = ll
    End Sub
    Public Overrides Sub OnProvideRepository(ByVal provideFileRepositoryContext As ProvideRepositoryContext)
        provideFileRepositoryContext.FileRepository = DefaultSettings.GetRepository()
    End Sub


    For redistribution it is important that additionally the List & Label license key (see also LicensingInfo) is specified in OnProvideListLabel() for the List & Label instance.

    Note: For a detailed implementation for DefaultSettings.GetRepository() in OnProvideRepository(), see the provided ASP.NET examples.


    Integration - .NET Switch

    The further procedure differs for .NET 6/.NET 7/.NET 8 and .NET 4.8.


    .NET 6/.NET 7/.NET 8:

    If you see a startup.cs file (otherwise see below), add the following lines to the end of the Configure method:

    public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
        // do some other stuff here
        // ...


    If there is no startup.cs you should have a program.cs in .NET 6. In this case, add app.UseWebReportViewer(); right after any other app.Use... call and add builder.Services.AddWebReportViewer(); right after any other builder.Services... call. 


    .NET 4.8:

    In the global.asax.cs/global.asax.vb file, add the following line before the RouteConfig.RegisterRoutes() call:



    Using Web Report Viewer

    The configuration is now complete. Now the Web Report Viewer can be inserted and used in the desired view as follows:

    @using combit.Reporting.Web
        Layout = null;
        string repositoryId = Request.QueryString["reportRepositoryID"];
        if (!String.IsNullOrEmpty(repositoryId))
            repositoryId = repositoryId.Replace("repository://{", "").Replace("}", "");
        var optionWRV = new WebReportViewerMVCOptions(repositoryId)
            Title = "Web Report Viewer"
    <!DOCTYPE html>



    The List & Label installation contains corresponding ASP.NET examples that show the use of the Web Report Viewer in detail.