IWebDocumentViewerReportResolver Interface

If implemented by a class, resolves reports that can be displayed by the Web Document Viewer control by their type names.

Namespace: DevExpress.XtraReports.Web.WebDocumentViewer

Assembly: DevExpress.XtraReports.v17.2.Web.dll

NuGet Package: DevExpress.Web.Reporting

Declaration

C#

public interface IWebDocumentViewerReportResolver

VB.NET

Public Interface IWebDocumentViewerReportResolver

Remarks

The default report resolver tries to load a report based on its fully qualified type name. To provide a custom report resolver, create a class implementing the IWebDocumentViewerReportResolver interface.

Below is a sample implementation of the IWebDocumentViewerReportResolver interface that allows a web application to resolve reports based on predefined custom identifiers in addition to the default behavior.

C#

using DevExpress.XtraReports.Web.WebDocumentViewer;
using DevExpress.XtraReports.UI;
// ...

public class CustomWebDocumentViewerReportResolver : IWebDocumentViewerReportResolver {
    public CustomWebDocumentViewerReportResolver() { }

    public XtraReport Resolve(string reportTypeName) {
        switch (reportTypeName) {
            case "Report1":
                return new XtraReport1();
            case "Report2":
                return new XtraReport2();
            default:
                // Try to create a report using the fully qualified type name.
                Type t = Type.GetType(reportTypeName);
                return typeof(XtraReport).IsAssignableFrom(t) ?
                    (XtraReport)Activator.CreateInstance(t) :                
                    null;                                             
        }      
    }
}

VB.NET

Imports DevExpress.XtraReports.Web.WebDocumentViewer
Imports DevExpress.XtraReports.UI
' ...

Public Class CustomWebDocumentViewerReportResolver
    Implements IWebDocumentViewerReportResolver
    Public Sub New()
    End Sub

    Public Function Resolve(ByVal reportTypeName As String) As XtraReport
        Select Case reportTypeName
            Case "Report1"
                Return New XtraReport1()
            Case "Report2"
                Return New XtraReport2()
            Case Else
                ' Try to create a report using the fully qualified type name.
                Dim t As Type = Type.GetType(reportTypeName)
                Return If(GetType(XtraReport).IsAssignableFrom(t), CType(Activator.CreateInstance(t), XtraReport), Nothing)
        End Select
    End Function
End Class

Register your custom report resolver in the application’s Global.asax file. For example:

C#

void Application_Start(object sender, EventArgs e) {
    DefaultWebDocumentViewerContainer.Register<IWebDocumentViewerReportResolver, CustomWebDocumentViewerReportResolver >();
}

VB.NET

Private Sub Application_Start(sender As Object, e As EventArgs)
    DefaultWebDocumentViewerContainer.Register(Of IWebDocumentViewerReportResolver, CustomWebDocumentViewerReportResolver)()
End Sub

Next, to avoid updating the entire web page when previewing a new report document, call the ASPxWebDocumentViewer.OpenReport method with the specified report ID.