Catching Exc As Exceptions?
Aug 5, 2010I have the following code
[code]....
and while that presents a friendlier error message to a user, I've forgotten how to show me the "real" error.
I have the following code
[code]....
and while that presents a friendlier error message to a user, I've forgotten how to show me the "real" error.
Thisis the code I use to display an aspxloadingpanel with an ms update panel:
var prm = Sys.WebForms.PageRequestManager.getInstance();
prm.add_initializeRequest(initializeRequest);
prm.add_pageLoaded(pageLoaded);[code]....
However when an error occurs on this page, the loading panel continuously remains on the screen...How can I catch errors so that instead it would actually show the error.
I have some code that is throwing unhandled DivideByZero exceptions in a WebMethod. These exceptions are not being caught by the global logging in Application_Error in global.asax. why exceptions thrown from a WebMethod are not handled by Application_Error?
View 3 RepliesImagine a web service with a method that returns a Customer object, that takes a customer ID as a parameter, i.e.
[WebMethod]
Customer GetCustomer(string customerId)
Now imagine that you're writing an ASP.NET app and you've generated a proxy for the service with the async operations. You create an instance of the service, wire service.GetCustomerCompleted to your handler, OnGetCustomerCompleted, and call service.GetCustomerAsync("12345"). In OnGetCustomerCompleted you apply logic to detect that no customer was found and throw a custom exception, or you want to throw the exception found in e.Error, e.g.:
void OnGetCustomerCompleted(object sender, GetCustomerCompletedEventArgs e)
{
if (e.Error != null)
throw new ApplicationException("GetCustomer failed", e.Error);
if (String.IsNullOrEmpty(e.Result.FirstName) && String.IsNullOrEmpty(e.Result.LastName))
throw new CustomerNotFoundException();
}
(I've omitted the bits of code that sets up a Customer object and persists it through the calls.) You launch the call to GetCustomerAsync in Page_Load and expect to retrieve the result in a handler wired to Page.OnPreRenderComplete. My question is, how do you catch the exception in your page? I know you can catch it with Global.asax's ApplicationError, but what if you don't want to navigate away from your page?
I'm building the standard 3-tier ASP.NET web application but I'm struggling as to where to do certain things - specifically handling exceptions.
I've tried to have a look around on the web for some examples but can't find any which go as far as a whole project showing how everything links together.
In my data-tier I'm connecting to SQL Server and doing some stuff. I know I need to catch exceptions that could be raised as a result but I'm not sure where to do it.
From what I've read I should be doing it in the UI tier but in that case I'm not sure how to ensure that the connection to the database is closed. Is anyone able to clarify how to do this? Also if anyone knows as to where I could find an example 3-tier web application that follows best practices that would be great too.
We have a asp.net application and want to implement logging. The first idea was to use the Application_Error method in the global.asax file.
The problem is that ASP.NET very often seem to throw exceptions internally that are not caused by the application and which seem not to interfer with the users normal workflow. For example we often get HTTPExceptions, UnauthorizedAccessExceptions and others caught in this method, although there is no real error in the application.
I am trying to catch an exception but occasionally get an inner exception. I want to output both into a label. I often get Object reference not set to instance of an object if there is no inner exception.
Catch ex As Exception
exError = ex.Message.ToString
If Not ex.InnerException.Message Is Nothing Then
exError &= "<br/>" & ex.InnerException.Message.ToString
End If
Return View()
End Try
Take the following code...
[Code]....
The aim here is to throw an 'AfterInitException' if there's an exception after Init has finished. My concern is that some low level error might result in an exception being thrown when, say, setting up the call to DoStuff and before the try/catch block within DoStuff has been set up. So an 'AfterInitException' would not be thrown even though the exception was thrown after Init!This might help...
[Code]....
...but then this is more messy and perhaps there could still be a low level exception which arises in clearing up the call to Init or setting up the try/catch block that follows it!
The situation is I have two xslt files: one is called from my ASP.NET code, and there, the second xslt file is imported.What I'd like to accomplish is to pass a parameter to the first one so the second xslt(the one that is imported at the first xslt) can read it.
My c# code looks like this:
var oArgs = new XsltArgumentList();
oArgs.AddParam("fbLikeFeatureName", "", "Facebook_Like_Button");
ltlContentBody.Text = xmlUtil.TransformXML(oXmlDoc, Server.MapPath(eSpaceId + "/styles/ExploringXSLT/ExploreContentObjects.xslt"), true);
And I'm catching the param at the first xslt this way: <xsl:param name="fbLikeFeatureName" />
And then, passing it to the second xslt like this(previously, I import that file):
<xsl:call-template name="Articles">
<xsl:with-param name="fbLikeFeatureName"></xsl:with-param>
</xsl:call-template>
Finally, I'm catching the param on the second xslt file as following: <xsl:value-of select="$fbLikeButtonName"/>
i have a problem where i have an exception being thrown that i am capturing in global asax. As part of this exception handling i redirect the user to a specific page because of this exception.
i also have ELMAH error handling with the email module plugged in. I do not want to receive emails for this exception. I also don't want to add this type of exception to ELMAHs ignore list, in case i want to do granular work around the exception (ie, only if it matches certain properties, happens on certain pages)
i want to:
write an Application_OnError that redirects a user to a page (i know how to do this part, more for procedure i've left it here) In the Application_OnError stop ELMAH fromrecieving this error after i've caught it
i am currently calling Server.ClearError() inside my App_OnError method, but am still receiving these emails....
Using VS2008 SP1, .NET 3.5 SP1, C# Web Application Project
As we know, Web Application Projects (unlike Web Site Projects) compile the entire site for deployment. We have discovered a situation where the visual studio compiler doesnt catch and error. Then when we deploy the dll to the website (or even just run it in the built in web server) it catches the error and displays it as a "compilation" error during runtime. This is obviously disturbing. Let me explain the error:
Take a single web page in a new C# web app project, such as the default.aspx. Add a checkbox. Create an event handler for the checked changed event. Note that it modifies the .aspx file to add oncheckedchanged="yourmethodhere" in the checkbox item. Compile and everything is fine.
Now change the name of the method in the .aspx file, say for yourmethodhere to yourmethodhere_1 and compile again. Note you havent change the code behind, so you SHOULD get a compile error. But you dont. Now if you deploy or debug it, you will get a compilation error during runtime.
Note: If you do exactly the same thing in a web SITE project, the validation compile that it does when you choose to "build" the project DOES catch this error. In other words, only c# web APPLICATION projects have this problem.
I have a classical asp.net web service (asmx) and a web method in it. I need to throw a custom exception for some case in my web method, and I need to catch that specific custom exception where I call the web service method.
[Code]....
However, I cannot do that because when I add the web service reference on the client, I have service class, input and output classes, but I do not have custom exception class.
Also another problem is that, I have also problems with serializing Exception class (because of Exception.Data property implements IDictionary interface)
Is there a way to do this in my way, or am I in a completely wrong way, or is there something I miss about fundamentals of web services?
I have a website that serves all its pages using a single 404 page. it displays hotel profiles form business and depending on different profile levels offers more or less functionality and information.
Through the DB a masterpage is selected and usercontrols are applyed to that.
I have a contact page like this : 404.aspx > masterpage.Master > contact.ascx
My form action looks like this default.aspx?404%3bhttp%3a%2f%2fwww1.testsite.co.uk%3a80%2fcontactus
and when I click the button this where I send up with an error "Validation of viewstate MAC failed" error.
I have read stuff on these for 4 hours but still have no idea where to start.
Do I need to
Catch the form action URL (postback URL) in the baseclass and change it back to [URL] - If I do this are the form firled values still intact
Do i need to do something to change the form.action url before the page is built, if so is this done in the masterpage preinit event as this is what the form tag is
What I know works is that the usercontrol is aware of the postback, but not the form values.
I want to be able to add a 404 based contact us form on any one of 1000s of profiles and be able to catch the values. Idearly I would like to do this in the codebehind of the usercontrol as this keeps the code seperate
I am sure this must be possible and normally I can work stuff out, but here I am totally stuck. I am trying to do this in VB.
I have a repeater control and in its footer temlate is a button (or 2 in the example) and I want to catch its click event but seem to not be able to.
I tried in the repeater itemcommand event and also I tried defining a subprocedure for the 'occlick' event but neither works..
[code]...
I have a aspx page with a ascx control inside an ascx control and the required field validator is not hit on the action of the page.
The issue is with the 2nd nested ascx control. The field validators in the first ascx control validate correctly, but with the ascx control inside the ascx control there are issues.
The nested ascx control is a repeater control and this may be the reason, but I am unsure.
I'm not exactly sure what question to ask, but I'll list a few below.
How do I attach the field validators up a level to the 1st ascx control?
Is it possible to put required fields into a nested ascx control?
How should I log exceptions? I never tried logging in .NET before. Nor try to dump exceptions to a txt (or binary) file. I dont require a text file, just a way to view the logs with the file and line #.
-edit- using asp.net
I have a simple button ADD
And ADD_Click code is:
protected void Add_Click(object sender, EventArgs e)
{
string strConnectionString = ConfigurationManager.ConnectionStrings["SqlServerCstr"].ConnectionString;
SqlConnection myConnection = new SqlConnection(strConnectionString);
myConnection.Open();
string hesap = Label1.Text;
string musteriadi = DropDownList1.SelectedItem.Value;
string avukat = DropDownList2.SelectedItem.Value;
SqlCommand cmd = new SqlCommand("INSERT INTO AVUKAT VALUES (@MUSTERI, @AVUKAT, @HESAP)", myConnection);
cmd.Parameters.AddWithValue("@HESAP", hesap);
cmd.Parameters.AddWithValue("@MUSTERI", musteriadi);
cmd.Parameters.AddWithValue("@AVUKAT", avukat);
cmd.Connection = myConnection;
SqlDataReader dr = cmd.ExecuteReader(System.Data.CommandBehavior.CloseConnection);
Response.Redirect(Request.Url.ToString());
myConnection.Close();
}
What i want is, if anybody adding a data with same HESAP (primary key) i want a alert() function with this words. "Already there is a same data" or any words. Doesn't matter.
How can i do that?
NOTE: I want just the same HESAP value getting and catching an error.
To make divs clickable I use this:
$(".clickable").click(function (event) {
window.location = $(this).find('a').attr('href');
event.preventDefault();
});
I'm using an <asp:Repeater> in asp.NET to create several such <div>s.The problem is that all clicks in the div are picked up by this jQuery - I also have an <asp:Button> inside the div, for this I want to catch the click as normal and process it in the repeater_ItemCommand event - But this doesn't fire - the page just redirects to the href found in the hyperlink in the div.
I insert this block of html/css/jquery into my page - in Safari and FireFox it works fine, but in IE 7/8 at about the 8th block of this the Style and some Jquery fx doesnt seem to catch; it is exactly the same as my other code, no mods in the ones that arent catching. It is just inserted in a column in my table on my page, actually the literal is there in the column, my literal.Text outputs blocks of:
[Code]....
Specifically the Style of
[Code]....
[Code]....
I have a set of WCF services which I have been using with an ASP.NET MVC application so far. These service operations return a FaultException when the server has identified problem with what the client has submitted. For example:
[code]...
However with Silverlight this all fails. The server returns a 500 status code with the faultexception (as expected) but to Silverlight this just looks like a duff response.
The following MS article indicates a (ugly) work around for this: [URL] This workaround makes the service transmit 200 status codes, even if there is a FaultException, so that the Silverlight client can get them. But this will mess up 'normal' clients of my service (my ASP.NET application, other users in the wild).
However, the point of services is to have seperation from your clients. I still want my services to return 500 status codes so that my ASP.NET application can detect the FaultExceptions and handle them. But I also want Silverlight to be able to handle them too.
string lNewHTML = Regex.Replace(lOldHTML, "(word1|word2|word3)", "<a href="page.aspx#$1">$1</a>", RegexOptions.IgnoreCase);
The code works, but I need to include some exceptions to the replace - e.g. I will not replace anything i an img-, li- and a-tag (including link-text and attributes like href and title) but still allow replacements in p-, td- and div-tags.
How can we prevent page crash in asp.net? Is there any generic function or place like global.asax where we specify a file to redirect to when an unhanded exception occurs? (like we redirect to a specified page when 404 page not found exception occurs?
View 3 RepliesI need to handle 404 exceptions differently than all other types of them. What is the best way to identify those 404 exceptions (distinguish them from other exceptions)?
The problem is that there is no a special exception class for 404 errors, I get regular System.Web.HttpException with Message = "File does not exist."
Should I just use exception's message for it or is there a better way?
I have a datasource that uses a business logic object for the select event. How can I catch an exception that occurs in the business logic layer and pass it to my presentation layer to display to the user in a label?
View 1 RepliesThere used to be an article at ELMAHs docs site that contained this information, but it seems to have been removed. I think it's as simple as setting a configuration setting in the section, but I haven't a clue what it isCan anyone take a few seconds and drop the configuration setting here?
View 1 Replies