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POQuestion about asp.net event handling
 

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  1. POQuestion about asp.net event handling
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    <p>what is the difference between</p> <pre><code>&lt;asp:DropDownList ID="Combo" OnSelectedIndexChanged="Change" AutoPostBack="True" runat="server"/&gt; </code></pre> <p>and </p> <pre><code>&lt;asp:DropDownList ID="Combo" SelectedIndexChanged="Change" AutoPostBack="True" runat="server"/&gt; </code></pre> <p>?</p> <p>And is the attribute AutoPostBack="True" always required?</p> <p>Iam asking because it seems my OnSelectedIndexChanged-event seem always to be called twice (EDIT: When I use SelectedIndexChanged, the handler isn't called at all).</p> <p>Why could this be?</p> <p>EDIT: these at the stacktraces I get from the event which is fired twice. The latter seem to be called from some kind of timer. I never created a time, it must be some of the system.</p> <pre><code> MyApp!MyNamespace.ListenControl.AuswahlGeändert(object sender = {System.Web.UI.WebControls.DropDownList}, System.EventArgs e = {System.EventArgs}) Zeile 44 C# System.Web.dll!System.Web.UI.WebControls.ListControl.OnSelectedIndexChanged(System.EventArgs e = {System.EventArgs}) + 0x70 Bytes System.Web.dll!System.Web.UI.WebControls.DropDownList.RaisePostDataChangedEvent() + 0x87 Bytes System.Web.dll!System.Web.UI.WebControls.DropDownList.System.Web.UI.IPostBackDataHandler.RaisePostDataChangedEvent() + 0xb Bytes System.Web.dll!System.Web.UI.Page.RaiseChangedEvents() + 0xa6 Bytes System.Web.dll!System.Web.UI.Page.ProcessRequestMain(bool includeStagesBeforeAsyncPoint = true, bool includeStagesAfterAsyncPoint = true) + 0x5ce Bytes System.Web.dll!System.Web.UI.Page.ProcessRequest(bool includeStagesBeforeAsyncPoint, bool includeStagesAfterAsyncPoint = true) + 0x84 Bytes System.Web.dll!System.Web.UI.Page.ProcessRequest() + 0x51 Bytes System.Web.dll!System.Web.UI.Page.ProcessRequestWithNoAssert(System.Web.HttpContext context) + 0x16 Bytes System.Web.dll!System.Web.UI.Page.ProcessRequest(System.Web.HttpContext context) + 0x32 Bytes App_Web_bm-nkhnz.dll!ASP.kfzpage_aspx.ProcessRequest(System.Web.HttpContext context = {System.Web.HttpContext}) + 0x26 Bytes C# System.Web.dll!System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() + 0xb6 Bytes System.Web.dll!System.Web.HttpApplication.ExecuteStep(System.Web.HttpApplication.IExecutionStep step = {System.Web.HttpApplication.CallHandlerExecutionStep}, ref bool completedSynchronously = true) + 0x4c Bytes System.Web.dll!System.Web.HttpApplication.ApplicationStepManager.ResumeSteps(System.Exception error) + 0x133 Bytes System.Web.dll!System.Web.HttpApplication.System.Web.IHttpAsyncHandler.BeginProcessRequest(System.Web.HttpContext context, System.AsyncCallback cb, object extraData) + 0x7c Bytes System.Web.dll!System.Web.HttpRuntime.ProcessRequestInternal(System.Web.HttpWorkerRequest wr = {Microsoft.VisualStudio.WebHost.Request}) + 0x17c Bytes System.Web.dll!System.Web.HttpRuntime.ProcessRequestNoDemand(System.Web.HttpWorkerRequest wr) + 0x63 Bytes System.Web.dll!System.Web.HttpRuntime.ProcessRequest(System.Web.HttpWorkerRequest wr) + 0x47 Bytes WebDev.WebHost.dll!Microsoft.VisualStudio.WebHost.Request.Process() + 0x165 Bytes WebDev.WebHost.dll!Microsoft.VisualStudio.WebHost.Host.ProcessRequest(Microsoft.VisualStudio.WebHost.Connection conn = {System.Runtime.Remoting.Proxies.__TransparentProxy}) + 0x6c Bytes [Anwendungsdomänenübergang] WebDev.WebHost.dll!Microsoft.VisualStudio.WebHost.Server.OnSocketAccept(object acceptedSocket) + 0x7d Bytes mscorlib.dll!System.Threading._ThreadPoolWaitCallback.WaitCallback_Context(object state) + 0x2f Bytes mscorlib.dll!System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, object state) + 0x6f Bytes mscorlib.dll!System.Threading._ThreadPoolWaitCallback.PerformWaitCallbackInternal(System.Threading._ThreadPoolWaitCallback tpWaitCallBack) + 0x53 Bytes mscorlib.dll!System.Threading._ThreadPoolWaitCallback.PerformWaitCallback(object state) + 0x59 Bytes </code></pre> <p>This is when the event is called the second time:</p> <pre><code>MyApp!MyNamespace.ListenControl.AuswahlGeändert(object sender = {System.Web.UI.WebControls.DropDownList}, System.EventArgs e = {System.EventArgs}) Zeile 44 C# System.Web.dll!System.Web.UI.WebControls.ListControl.OnSelectedIndexChanged(System.EventArgs e = {System.EventArgs}) + 0x70 Bytes System.Web.dll!System.Web.UI.WebControls.DropDownList.RaisePostDataChangedEvent() + 0x87 Bytes System.Web.dll!System.Web.UI.WebControls.DropDownList.System.Web.UI.IPostBackDataHandler.RaisePostDataChangedEvent() + 0xb Bytes System.Web.dll!System.Web.UI.Page.RaiseChangedEvents() + 0xa6 Bytes System.Web.dll!System.Web.UI.Page.ProcessRequestMain(bool includeStagesBeforeAsyncPoint = true, bool includeStagesAfterAsyncPoint = true) + 0x5ce Bytes System.Web.dll!System.Web.UI.Page.ProcessRequest(bool includeStagesBeforeAsyncPoint, bool includeStagesAfterAsyncPoint = true) + 0x84 Bytes System.Web.dll!System.Web.UI.Page.ProcessRequest() + 0x51 Bytes System.Web.dll!System.Web.UI.Page.ProcessRequestWithNoAssert(System.Web.HttpContext context) + 0x16 Bytes System.Web.dll!System.Web.UI.Page.ProcessRequest(System.Web.HttpContext context) + 0x32 Bytes App_Web_bm-nkhnz.dll!ASP.kfzpage_aspx.ProcessRequest(System.Web.HttpContext context = {System.Web.HttpContext}) + 0x26 Bytes C# System.Web.dll!System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() + 0xb6 Bytes System.Web.dll!System.Web.HttpApplication.ExecuteStep(System.Web.HttpApplication.IExecutionStep step = {System.Web.HttpApplication.CallHandlerExecutionStep}, ref bool completedSynchronously = true) + 0x4c Bytes System.Web.dll!System.Web.HttpApplication.ApplicationStepManager.ResumeSteps(System.Exception error) + 0x133 Bytes System.Web.dll!System.Web.HttpApplication.ResumeStepsFromThreadPoolThread(System.Exception error) + 0x25 Bytes System.Web.dll!System.Web.HttpApplication.AsyncEventExecutionStep.ResumeStepsWithAssert(System.Exception error) + 0x28 Bytes System.Web.dll!System.Web.HttpApplication.AsyncEventExecutionStep.OnAsyncEventCompletion(System.IAsyncResult ar) + 0x84 Bytes System.Web.dll!System.Web.HttpAsyncResult.Complete(bool synchronous, object result, System.Exception error, System.Web.RequestNotificationStatus status) + 0x3e Bytes System.Web.dll!System.Web.SessionState.SessionStateModule.PollLockedSessionCallback(object state) + 0x169 Bytes mscorlib.dll!System.Threading._TimerCallback.TimerCallback_Context(object state) + 0x2f Bytes mscorlib.dll!System.Threading.ExecutionContext.runTryCode(object userData) + 0x51 Bytes [Übergang von Systemeigen zu Verwaltet] [Übergang von Verwaltet zu Systemeigen] mscorlib.dll!System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, object state) + 0x67 Bytes mscorlib.dll!System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, object state) + 0x45 Bytes mscorlib.dll!System.Threading._TimerCallback.PerformTimerCallback(object state) + 0x6b Bytes [Anwendungsdomänenübergang] </code></pre>
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    1. COI'm really surprised the second example works because Intellisense only gives me the first one.
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      1. POQuestion about asp.net event handling
      1. USGreg
    2. COI now found out that the second one isn't working at all. There is no error but also no event handler called
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      1. POQuestion about asp.net event handling
      1. UScodymanix
 

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