IExceptionHandler Interface

A base interface to handle server-side errors in the web reporting controls.

Namespace: DevExpress.XtraReports.Web.ClientControls

Assembly: DevExpress.XtraReports.v20.2.Web.dll

NuGet Package: DevExpress.Web.Reporting.Common

Declaration

C#

public interface IExceptionHandler

VB.NET

Public Interface IExceptionHandler

Remarks

The following interfaces are inherited from the IExceptionHandler interface:

• IReportDesignerExceptionHandler
• IWebDocumentViewerExceptionHandler
• IQueryBuilderExceptionHandler

This base interface provides the GetExceptionMessage method that is called when any server-side error occurs.

The following code snippet demonstrates how to implement this method and return an actual exception message:

C#

using System;
using DevExpress.XtraReports.Web.QueryBuilder.Services;
using DevExpress.XtraReports.Web.ReportDesigner.Services;
using DevExpress.XtraReports.Web.WebDocumentViewer;

public class CustomExceptionHandler : IReportDesignerExceptionHandler, 
    IWebDocumentViewerExceptionHandler, IQueryBuilderExceptionHandler {
    public string GetExceptionMessage(Exception ex) {
        return ex.Message;
    }
}

VB.NET

Imports System
Imports DevExpress.XtraReports.Web.QueryBuilder.Services
Imports DevExpress.XtraReports.Web.ReportDesigner.Services
Imports DevExpress.XtraReports.Web.WebDocumentViewer

Public Class CustomExceptionHandler
    Inherits IReportDesignerExceptionHandler
    Implements IWebDocumentViewerExceptionHandler, IQueryBuilderExceptionHandler

    Public Function GetExceptionMessage(ByVal ex As Exception) As String
        Return ex.Message
    End Function
End Class

To register the implemented exception handler, use the static methods at the application’s startup as shown below:

C#

void Application_Start(object sender, EventArgs e) {
    // ...
    DevExpress.XtraReports.Web.WebDocumentViewer.DefaultWebDocumentViewerContainer.
        Register<IWebDocumentViewerExceptionHandler, CustomExceptionHandler>();
    DevExpress.XtraReports.Web.ReportDesigner.DefaultReportDesignerContainer.
        Register<IReportDesignerExceptionHandler, CustomExceptionHandler>();
    DevExpress.XtraReports.Web.QueryBuilder.DefaultQueryBuilderContainer.
        Register<IQueryBuilderExceptionHandler, CustomExceptionHandler>();
}

VB.NET

Private Sub Application_Start(ByVal sender As Object, ByVal e As EventArgs)
    ' ...
    DevExpress.XtraReports.Web.WebDocumentViewer.DefaultWebDocumentViewerContainer.
        Register(Of IWebDocumentViewerExceptionHandler, CustomExceptionHandler)()
    DevExpress.XtraReports.Web.ReportDesigner.DefaultReportDesignerContainer.
        Register(Of IReportDesignerExceptionHandler, CustomExceptionHandler)()
    DevExpress.XtraReports.Web.QueryBuilder.DefaultQueryBuilderContainer.
        Register(Of IQueryBuilderExceptionHandler, CustomExceptionHandler)()
End Sub