PageInfoDataProviderBase Class

A service that allows the XRPageInfo control to display custom information.

Namespace: DevExpress.XtraPrinting

Assembly: DevExpress.Printing.v23.1.Core.dll

NuGet Packages: DevExpress.Printing.Core, DevExpress.Win.Dashboard.Design

Declaration

C#

public abstract class PageInfoDataProviderBase

VB.NET

Public MustInherit Class PageInfoDataProviderBase

Remarks

The following code displays the name of a logged in user instead of a user under whose account the web server runs. The PageInfoDataProviderBase service processes the PageInfo bricks, and returns information from the HttpContext about the current user.

C#

using System.Web;
using DevExpress.XtraPrinting;

class CustomPageInfoDataProvider : PageInfoDataProviderBase
{
    readonly HttpContext httpContext;
    public CustomPageInfoDataProvider(HttpContext httpContext)
    {
        this.httpContext = httpContext;
    }

    public override string GetText(PrintingSystemBase ps, PageInfoTextBrickBase brick)
    {
        if (brick.PageInfo != PageInfo.UserName)
        {
            return null;
        }
        if (httpContext == null)
            return "<No Information>";
        var user = httpContext.User;
        if (user == null || user.Identity == null)
            return "<Please enable Forms or Windows security>";
        var identity = user.Identity;
        return identity.IsAuthenticated
            ? identity.Name
            : "<Guest>";
    }
}

VB.NET

Imports DevExpress.XtraPrinting

Friend Class CustomPageInfoDataProvider
    Inherits PageInfoDataProviderBase

    Private ReadOnly httpContext As HttpContext
    Public Sub New(ByVal httpContext As HttpContext)
        Me.httpContext = httpContext
    End Sub

    Public Overrides Function GetText(ByVal ps As PrintingSystemBase,
                                      ByVal brick As PageInfoTextBrickBase) As String
        If brick.PageInfo <> PageInfo.UserName Then
            Return Nothing
        End If
        If httpContext Is Nothing Then
            Return "<No Information>"
        End If
        Dim user = httpContext.User
        If user Is Nothing OrElse user.Identity Is Nothing Then
            Return "<Please enable Forms or Windows security>"
        End If
        Dim identity = user.Identity
        Return If(identity.IsAuthenticated, identity.Name, "<Guest>")
    End Function
End Class

To add the custom page info data provider to a report’s Printing System, call the PrintingSystemBase.AddService method in the WebDocumentViewerOperationLogger.BuildStarting method body of a custom WebDocumentViewerOperationLogger implementation.

C#

using System;
using System.Web;
using DevExpress.XtraPrinting;
using DevExpress.XtraReports.UI;
using DevExpress.XtraReports.Web.WebDocumentViewer;

class CustomWebDocumentViewerOperationLogger : WebDocumentViewerOperationLogger
{
    public override Action BuildStarting(string reportId, XtraReport report, ReportBuildProperties buildProperties)
    {
        var httpContext = HttpContext.Current;
        return () => GenerateBuildStatingAction(report, httpContext);
    }

    static void GenerateBuildStatingAction(XtraReport report, HttpContext httpContext)
    {
        report.PrintingSystem.AddService(typeof(PageInfoDataProviderBase), new CustomPageInfoDataProvider(httpContext));
    }
}

VB.NET

Imports DevExpress.XtraPrinting
Imports DevExpress.XtraReports.UI
Imports DevExpress.XtraReports.Web.WebDocumentViewer

Friend Class CustomWebDocumentViewerOperationLogger
    Inherits WebDocumentViewerOperationLogger

    Public Overrides Function BuildStarting(ByVal reportId As String,
                                            ByVal report As XtraReport,
                                            ByVal buildProperties As ReportBuildProperties) As Action
        Dim httpContext = System.Web.HttpContext.Current
        Return Sub() GenerateBuildStatingAction(report, httpContext)
    End Function

    Private Shared Sub GenerateBuildStatingAction(ByVal report As XtraReport,
                                                  ByVal httpContext As HttpContext)
        report.PrintingSystem.AddService(GetType(PageInfoDataProviderBase),
                                         New CustomPageInfoDataProvider(httpContext))
    End Sub
End Class

To configure a report before document creation, add the custom operation logger to the DefaultWebDocumentViewerContainer at application startup.

C#

using DevExpress.Web.Mvc;
using WebDocumentViewer_UserName.Services;
using DevExpress.XtraReports.Web.WebDocumentViewer;
// ...
        protected void Application_Start() {
        // ...
            DefaultWebDocumentViewerContainer.RegisterSingleton<WebDocumentViewerOperationLogger, CustomWebDocumentViewerOperationLogger>();
            DefaultWebDocumentViewerContainer.DisableCachedDocumentSource();
            // ...
        }

VB.NET

Imports DevExpress.Web.Mvc
Imports DevExpress.XtraReports.Web.WebDocumentViewer
Imports WebDocumentViewer_UserName_VB.Services
' ...
    Sub Application_Start()
    ' ...
        DefaultWebDocumentViewerContainer.Register(Of WebDocumentViewerOperationLogger, CustomWebDocumentViewerOperationLogger)()
        DefaultWebDocumentViewerContainer.DisableCachedDocumentSource()
        ' ...
    End Sub

View Example: How to Display the Name of the Current Logged in User in a Report

Inheritance

Object

PageInfoDataProviderBase