ASPxWebControl.CallbackError Event
Allows you to handle any server exception that might occur during server-side processing of a callback sent by a DevExpress web control.
Namespace: DevExpress.Web
Assembly: DevExpress.Web.v23.2.dll
NuGet Package: DevExpress.Web
Declaration
Event Data
The CallbackError event's data class is EventArgs.
Remarks
See Handling Callback Exceptions on the Server Side to learn more.
Example
This example demonstrates how the ASPxWebControl.CallbackError server static event can be used within the Global.asax file to delegate handling of exceptions that occur during processing of DevExpress web control callbacks to the Application_Error event handler.
<%@ Application Language="C#" %>
<%@ Import Namespace="System.IO" %>
<%@ Import Namespace="DevExpress.Web" %>
<script RunAt="server">
void Application_Start(object sender, EventArgs e) {
// Assign Application_Error as a callback error handler
ASPxWebControl.CallbackError += new EventHandler(Application_Error);
}
void Application_Error(object sender, EventArgs e) {
// Use HttpContext.Current to get a Web request processing helper
HttpServerUtility server = HttpContext.Current.Server;
Exception exception = server.GetLastError();
if (exception is HttpUnhandledException)
exception = exception.InnerException;
// Log an exception
AddToLog(exception.Message, exception.StackTrace);
}
void AddToLog(string message, string stackTrace) {
StringBuilder sb = new StringBuilder();
sb.AppendLine(DateTime.Now.ToLocalTime().ToString());
sb.AppendLine(message);
sb.AppendLine();
sb.AppendLine("Source File: " + HttpContext.Current.Request.RawUrl);
sb.AppendLine();
sb.AppendLine("Stack Trace: ");
sb.AppendLine(stackTrace);
for (int i = 0; i < 150; i++)
sb.Append("-");
sb.AppendLine();
HttpContext.Current.Session["Log"] += sb.ToString();
sb.AppendLine();
}
</script>
<?xml version="1.0" encoding="utf-8"?>
<configuration>
<configSections>
<sectionGroup name="devExpress">
<section name="themes" type="DevExpress.Web.ThemesConfigurationSection, DevExpress.Web.v15.1, Version=15.1.15.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a" requirePermission="false" />
<section name="compression" type="DevExpress.Web.CompressionConfigurationSection, DevExpress.Web.v15.1, Version=15.1.15.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a" requirePermission="false" />
<section name="settings" type="DevExpress.Web.SettingsConfigurationSection, DevExpress.Web.v15.1, Version=15.1.15.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a" requirePermission="false" />
<section name="errors" type="DevExpress.Web.ErrorsConfigurationSection, DevExpress.Web.v15.1, Version=15.1.15.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a" requirePermission="false" />
</sectionGroup>
</configSections>
<system.web>
<compilation debug="true" targetFramework="4.0">
<assemblies>
<add assembly="DevExpress.Data.v15.1, Version=15.1.15.0, Culture=neutral, PublicKeyToken=B88D1754D700E49A" />
<add assembly="DevExpress.Web.v15.1, Version=15.1.15.0, Culture=neutral, PublicKeyToken=B88D1754D700E49A" />
<add assembly="DevExpress.Printing.v15.1.Core, Version=15.1.15.0, Culture=neutral, PublicKeyToken=B88D1754D700E49A" />
<add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
<add assembly="System.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A" />
<add assembly="System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
<add assembly="DevExpress.RichEdit.v15.1.Core, Version=15.1.15.0, Culture=neutral, PublicKeyToken=B88D1754D700E49A" />
</assemblies>
</compilation>
<pages validateRequest="false"></pages>
<customErrors redirectMode="ResponseRedirect" defaultRedirect="~/ErrorPage.aspx" mode="On">
<error statusCode="500" redirect="~/ErrorPage.aspx" />
</customErrors>
<httpModules>
<add type="DevExpress.Web.ASPxHttpHandlerModule, DevExpress.Web.v15.1, Version=15.1.15.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a" name="ASPxHttpHandlerModule" />
</httpModules>
<httpHandlers>
<add type="DevExpress.Web.ASPxHttpHandlerModule, DevExpress.Web.v15.1, Version=15.1.15.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a" verb="GET,POST" path="DX.ashx" validate="false" />
<add verb="GET,POST" path="ASPxUploadProgressHandlerPage.ashx" type="DevExpress.Web.ASPxUploadProgressHttpHandler, DevExpress.Web.v15.1, Version=15.1.15.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a" />
</httpHandlers>
</system.web>
<system.webServer>
<modules>
<add type="DevExpress.Web.ASPxHttpHandlerModule, DevExpress.Web.v15.1, Version=15.1.15.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a" name="ASPxHttpHandlerModule" />
</modules>
<validation validateIntegratedModeConfiguration="false" />
<handlers>
<add type="DevExpress.Web.ASPxHttpHandlerModule, DevExpress.Web.v15.1, Version=15.1.15.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a" verb="GET,POST" path="DX.ashx" name="ASPxHttpHandlerModule" preCondition="integratedMode" />
<add name="ASPxUploadProgressHandler" preCondition="integratedMode" verb="GET,POST" path="ASPxUploadProgressHandlerPage.ashx" type="DevExpress.Web.ASPxUploadProgressHttpHandler, DevExpress.Web.v15.1, Version=15.1.15.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a" />
</handlers>
</system.webServer>
<devExpress>
<themes enableThemesAssembly="true" styleSheetTheme="" theme="" customThemeAssemblies="" />
<compression enableHtmlCompression="false" enableCallbackCompression="true" enableResourceCompression="true" enableResourceMerging="true" />
<settings doctypeMode="Xhtml" rightToLeft="false" embedRequiredClientLibraries="false" ieCompatibilityVersion="edge" />
<errors callbackErrorRedirectUrl="~/ErrorPage.aspx" />
</devExpress>
</configuration>
Related GitHub Examples
The following code snippets (auto-collected from DevExpress Examples) contain references to the CallbackError event.
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See Also