Asp Net User Control Error Handling
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a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up ASP.NET UserControl OnError up vote 5 down vote favorite UserControls in ASP.NET (4.0) inherit from System.Web.UI.UserControl. VisualStudio intellisense suggest OnError as valid override of TemplateControl. At runtime .NET ignores this error asp net usercontrol handling. Only the OnError at Page-Level gets invoked. Did i miss anything or is there a design issue? public partial class Sample : System.Web.UI.UserControl { protected override void OnError(EventArgs e) { // Never reach ;o) base.OnError(e); } } asp.net exception-handling user-controls share|improve this question asked Jun 7 '10 at 15:58 Michael Piendl 2,0471721 Possibly related: stackoverflow.com/questions/341417/… –Deniz Dogan Jun 7 '10 at 16:03 @deniz dogan: i could not use an errorhandling outside the control. it need to be an internal fallback. it's also not possible to attach on the error event in OnInit. –Michael Piendl Jun 7 '10 at 16:13 add a comment| 2 Answers 2 active oldest votes up vote 2 down vote accepted ah.. the elusive OnError this page sheds some good light on the inner workings of this event: http://weblogs.asp.net/vga/archive/2003/06/16/8748.aspx it may be that some exceptions are caught w/out triggering OnError share|improve this answer answered Jun 9 '10
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like you, helping each other. Join them; it only takes a minute: Sign up How to handle exceptions thrown in own ASP.NET user control? up vote 0 down vote favorite I have created a user control that is http://stackoverflow.com/questions/2991058/asp-net-usercontrol-onerror using a library I have created. The library can throw a few exceptions, some which are of the kind that should not cause a run-time issue. I am unsure how to best proceed from this point in terms of handing those specific exceptions. Do I include a label in my user control that will show a friendly message when the exceptions mentioned above are thrown? Do I avoid catching the exceptions and let the user http://stackoverflow.com/questions/18804211/how-to-handle-exceptions-thrown-in-own-asp-net-user-control of the control decide what to do with them? Seems like this option would reveal information about the workings of the control. Do I create my own exception(s) and throw those when catching any of the above mentioned exceptions? Something else I have not thought about? c# asp.net exception user-controls share|improve this question asked Sep 14 '13 at 17:05 user1323245 304313 add a comment| 1 Answer 1 active oldest votes up vote 1 down vote accepted If you can't definitively handle them, then you shouldn't. Tidy up,as in catch, dispose throw is fine. It's "me" who wants to use the control, it's "me" who gets to decide what to do when an exception gets raised. All I can say is any suite of controls, that swallowed, hid or otherwise stuffed up a stacktrace in an error scenario, gets a 0/10, crap, don't buy it sticker from me. share|improve this answer answered Sep 14 '13 at 17:22 Tony Hopkinson 17.1k22032 I see what you are saying, and I believe I agree. I am curious about revealing that the control is using a certain class / library though. Is it something I should "worry" about? –user1323245 Sep 14 '13 at 17:33 1 I wouldn't but I'm an open sort of bloke. If you were thinking about obfuscation and hiding the how then
control how to throw (raise) exception from a custom control - ASP.NET Building Controls Here is an interesting situation I'm facing while creating custom controls. Problem Abstract: Unable to throw a exception from within the custom user control I developed as a DLL. Details: I wrote a simple custom user control which creates a text box dynamically. Then I added try catch in the custom user control and deliberately inserted a run time error to test the exception handling from custom user control back to the calling web page. The custom user control code is as follows and is very simple using System; using System.Web.UI; using System.Web.UI.WebControls; using System.ComponentModel; namespace WebControlLibrary1 { public class ... Thread Tools Show Printable Version Email this Page… Subscribe to this Thread… Display Linear Mode Switch to Hybrid Mode Switch to Threaded Mode October 18th,04:15 AM #1 how to throw (raise) exception from a custom control Here is an interesting situation I'm facing while creating custom controls. Problem Abstract: Unable to throw a exception from within the custom user control I developed as a DLL. Details: I wrote a simple custom user control which creates a text box dynamically. Then I added try catch in the custom user control and deliberately inserted a run time error to test the exception handling from custom user control back to the calling web page. The custom user control code is as follows and is very simple using System; using System.Web.UI; using System.Web.UI.WebControls; using System.ComponentModel; namespace WebControlLibrary1 { public class WebCustomControl1 : System.Web.UI.WebControls.WebControl { protected override void CreateChildControls() { try { int[] arr = new int[2]{1,2}; TextBox myTextBox = new TextBox(); myTextBox.Text = arr[4].ToString(); Controls.Add(myTextBox); } catch(Exception Ex) { throw new Exception(Ex.Message); } } protected override void OnPreRender(EventArgs e) { } } } As you can see from the code I deliberately introduced a run time error (arr[4]) to test the error os propagated to the calling web page. Now, when I used this control in my web form and try to run it I expect that the error will be propagated from the user control to my web page and display is somewhere. Here is the complete code for my web form's code behind using ...... namespace WebApplication1 { public class WebForm1 : System.Web.UI.Page { protected WebControlLibrary1.WebCustomControl1 mySimpleTextControl; protected System.Web.UI.WebControls.Label Label1; private void Page_Load(object sender, System.EventArgs e) { } } } When I run this code, the