ErrorHandling Class

Provides static members for the error handling in ASP.NET Web Forms applications.

Namespace: DevExpress.ExpressApp.Web

Assembly: DevExpress.ExpressApp.Web.v22.1.dll

Declaration

C#

public class ErrorHandling

VB.NET

Public Class ErrorHandling

Related API Members

The following members return ErrorHandling objects:

• ErrorHandling.Instance

Remarks

The ErrorHandling is an auxiliary class that is used to handle errors occurring in ASP.NET Web Forms applications.

By default, the information related to the error that occurred is displayed, logged, and the application administrator receives an e-mail notification. This behavior is configurable via the configuration file (Web.config) options listed in the Error Handling in ASP.NET Web Forms Applications topic. Additionally, you can use the ErrorHandling.CustomSendErrorNotification and ErrorHandling.CustomSendMailMessage events to customize the notifications mechanism. You can subscribe to these events in the ASP.NET Web Forms application’s Session_Start method. This method’s code is located in the Global.asax.cs (Global.asax.vb) file of the ASP.NET Web Forms application project. The following snippet illustrates subscribing to the ErrorHandling.CustomSendMailMessage.

C#

protected void Session_Start(object sender, EventArgs e) {
    WebApplication.SetInstance(Session, new MySolutionWebApplication());
    ErrorHandling.CustomSendMailMessage += 
        new EventHandler<CustomSendMailMessageEventArgs>(ErrorHandling_CustomSendMailMessage);
     // ...
    WebApplication.Instance.Setup();
    WebApplication.Instance.Start();
}

VB.NET

Protected Sub Session_Start(ByVal sender As Object, ByVal e As EventArgs)
    WebApplication.SetInstance(Session, New MySolutionWebApplication())
    AddHandler ErrorHandling.CustomSendMailMessage, AddressOf ErrorHandling_CustomSendMailMessage
     ' ...
    WebApplication.Instance.Setup()
    WebApplication.Instance.Start()
End Sub

The default XAF web application project contains the Error.aspx.cs (Error.aspx.vb) file, where you can see examples of this class’ members in use.

Related GitHub Examples

The following code snippets (auto-collected from DevExpress Examples) contain references to the ErrorHandling class.

Note

The algorithm used to collect these code examples remains a work in progress. Accordingly, the links and snippets below may produce inaccurate results. If you encounter an issue with code examples below, please use the feedback form on this page to report the issue.

C#

XAF_how-to-prevent-sorting-and-grouping-by-certain-columns-in-a-listview-e1254/CS/WinWebSolution.Web/Error.aspx.cs#L41

ErrorInfo errorInfo = ErrorHandling.GetApplicationError();
if(errorInfo != null) {

XAF_how-to-use-custom-aspxgridview-template-in-a-web-xaf-application-e1671/CS/WebExample.Web/Error.aspx.cs#L41

ErrorInfo errorInfo = ErrorHandling.GetApplicationError();
if(errorInfo != null) {

XAF_how-to-add-information-about-the-current-user-in-the-log-information-e1498/CS/WebSolution.Web/Error.aspx.cs#L41

ErrorInfo errorInfo = ErrorHandling.GetApplicationError();
if(errorInfo != null) {

XAF_how-to-create-an-action-using-the-actionattribute-e3884/CS/ActionAttributeExample.Web/Error.aspx.cs#L41

ErrorInfo errorInfo = ErrorHandling.GetApplicationError();
if(errorInfo != null) {

XAF_how-to-display-a-list-view-as-a-chart-e2840/CS/ChartExample.Web/Global.asax.cs#L41

protected void Application_Error(Object sender, EventArgs e) {
    ErrorHandling.Instance.ProcessApplicationError();
}

VB.NET

XAF_how-to-prevent-sorting-and-grouping-by-certain-columns-in-a-listview-e1254/VB/WinWebSolution.Web/Error.aspx.vb#L43

Dim errorInfo As ErrorInfo = ErrorHandling.GetApplicationError()
If errorInfo IsNot Nothing Then

XAF_how-to-use-custom-aspxgridview-template-in-a-web-xaf-application-e1671/VB/WebExample.Web/Error.aspx.vb#L43

Dim errorInfo As ErrorInfo = ErrorHandling.GetApplicationError()
If errorInfo IsNot Nothing Then

XAF_how-to-add-information-about-the-current-user-in-the-log-information-e1498/VB/WebSolution.Web/Error.aspx.vb#L43

Dim errorInfo As ErrorInfo = ErrorHandling.GetApplicationError()
If errorInfo IsNot Nothing Then

XAF_how-to-create-an-action-using-the-actionattribute-e3884/VB/ActionAttributeExample.Web/Error.aspx.vb#L43

Dim errorInfo As ErrorInfo = ErrorHandling.GetApplicationError()
If errorInfo IsNot Nothing Then

XAF_how-to-display-a-list-view-as-a-chart-e2840/VB/ChartExample.Web/Global.asax.vb#L42

Protected Sub Application_Error(ByVal sender As Object, ByVal e As EventArgs)
    ErrorHandling.Instance.ProcessApplicationError()
End Sub

Inheritance

Object

ErrorHandling