C# - NullReferenceException While Calling WebMethod?
Aug 24, 2010
I have the following problem;My console app is running on the server and all I want to do is control it over ASP.NET Web Service.
I added new ASP.NET Web Service project to my Solution where my main console app and added reference to it.The problem is every time WebMethod calls function from console app, i get the nullreferenceexception. Even if I try to use static classes or singletons; every object is null, although my console app is running absolutely correctly.
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Sep 10, 2010
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Feb 25, 2016
I am trying to implement your code in "Calling ASP.Net WebMethod using jQuery AJAX", but the alert is giving me the value "Undefined".
I believe my website (asp.net c#) is not correctely configured for webmethods.
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Dec 10, 2010
my page Evaluation.aspx has this code
[Code]....
and I am calling the webmethod by javascript like this
[Code]....
The result is, I get the error function running and I get "undefined error" alert.Am I calling the procedure correctly? I put a breakpoint on the webmethod and it.
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Dec 10, 2010
i wrote a webmethod on webservice. it will do adding product to shoppingbasket. But it doesn't work. i used a class and its method in this webservice method. error is about it. my code are below:
[Code]....
[Code]....
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Aug 4, 2010
, imagine a Master page that implements IFooMaster with a method
ShowFancyMessagePopupTheBusinessCantLiveWithout(string message);
I am in a page that inherits this master page. Upon a checkbox being unchecekd, I want to show a message to the user that if they save it, they can't re-check the checkbox without some admin action.
I've been given feedback that I can't just use an alert('message'); in javascript because they want the consistent look of these messages.
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[WebMethod]
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if(!checkboxICareAbout.Checked)
((IFooMaster)Master).ShowFancyMessagePopupTheBusinessCantLiveWithout("If you uncheck that thing, you can't recheck it.");
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Since ShowSuperImportantMessage() is static, I can't access Master from within. The method on the master page looks more or less like this:
public void ShowFancyMessagePopupTheBusinessCantLiveWithout(string message)
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lblGenericMessage.Text = message;
btnGenericMessageOK.Focus();
upGenericMessage.Update();
mpeGenericMessage.Show();
}
mpeGenericMessage is an ajaxtoolkit:ModalPopupExtender.
upGenericMessage is an update panel.The other 2 are obvious.
Can I do some jQuery kung-fu to show that stuff? I tried, but the solution complained that the controls I tried to refer to by ClientID didn't resolve since they were on the Master page.
quick edit: Before anyone tells me the architecture is a problem, or I shouldn't have put such a thing on a master page, or w/e...
I know the situation is not ideal, but I this is inherited code, and I can't drop it all and rewrite half of their web stack.
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Mar 8, 2011
$.ajax(
{
type: "POST",
url: "Default.aspx/GetAge",
data: "{}",[code]...
Right now it reports the following error: "Cannot locate the resource". I figure that I am specifying the url incorrectly. This javascript is in an external file located in the same directory as Default.aspx .
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Mar 3, 2011
I understand how to use jQuery to make an AJAX call to a WebMethod from a normal page, but I'm running into problems doing it from a UserControl (ASCX). Right now the biggest Issue I'm having is that the JavaScript for getting access to the groupDropDown control is not working. It seems that since this is a UserControl hosted within DotNetNuke, the ususal method of getting the CLientID is not working since it is nested down x number of levels. Here is what I have:
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[code]....
I'm now just referencing a TextBox:<asp:TextBox ID="dealerId" runat="server" CssClass="theDealer" />
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Jul 1, 2010
I'm trying to implement a view tracking web service on my website. I'm using JavaScript because I want to exclude any search bots from my tracked views. The problem is I'm getting a "Unknown web method" error when I try to use jQuery to post to the web service I've created.
$(document).ready(function() {
$.ajax({
type: "POST", [code]...
The error is an ASP .NET error: Unknown web method TrackItemView. Parameter name: methodName.I've done this hundreds of times (seemingly), but I just can't see what I'm missing. I'm sure it's something small...
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Mar 2, 2011
The message sent to browser is as follows:
The type My.API.Class is ambiguous: it could come from assembly '[on Temporary ASP.NET Files]' or from assembly '[on bin folder]'
The problem occurs when debugging a Web App, speciically when making a request to a WebMethod of a WebService.The project compiles just right. It generates My.Website.dll on bin folder and if I publish the Web Application. It works fine.The asmx file is on the root of the application. The CodeBehind file is on App_Code and its marked to be compiled to generate My.Website.dll.The way this person exposes its problem is somehow similar but I get starting to be lost when he talks about a proxy class and shared dlls I don't use.
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Nov 24, 2010
I have register.aspx at root level folder and updateprofile.aspx in folder /secure/user/ .
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May 19, 2010
I have a service that works great on my development box. It uses JQuery to hit my web service, and then the JSON results are sent back.
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The web page seems to be trying to call the web method correctly - the JSON data is being sent... but the server doesn't seem to know it's a webmethod. here's my service function (it's in our basepage.cs which inherits from Page).
[Code]....
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Oct 28, 2010
m a pretty new developer so I'm not well versed in common ASP.NET problems.As a test, my boss asked me to convert a (not very critical) ASP.NET site from 1.1 to 4.0. Well, it's not extremely difficult and things are going well so far. However, I've hit a small snag. I keep getting a NullReferenceException when I run this code
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May 19, 2010
When I submit invalid data to test my form validation I get a NullReferenceException on the folloing line of code in my view:
[Code]....
I can't seem to find anything that's null.assessment.AssessmentDescr is populated with the expected string.assessment.Score is populated with the value 0.Any ideas as to what might be causing the NullReferenceException? Seems to me that Html.TextBox has everything it nees to render the TextBox.
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I followed the directions from MSDN on transferring data between asp.net pages.But when using the 'PreviousPage' property to access the previous pages controls, I get a null ref exception that PreviousPage is not set to an instance of an object.Here is my code:
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{
public string Username
[code]...
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we have an MVC app that is after some time getting to some kind of bad state. I found only a couple of posts with a similar error message and they pointed to not changing up the routing table (after appstart). However this app doesn't mess with the routing table after appstart so that would appear not to be the cause of our problem. Recycling the app makes the error go away... for a time. Got 3 sites (all running of the same codebase) that this is effecting.
Just incase I'm doing something naughty in my application class heres a bit of source:
[Code]....
And the class that inherits from: [Code]....
Stack trace follows:[NullReferenceException: Object reference not set to an instance of an object.]
System.Web.Routing.RouteCollection.GetVirtualPath(RequestContext requestContext, RouteValueDictionary values) +97
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Oct 27, 2010
As a test, my boss asked me to convert a (not very critical) ASP.NET site from 1.1 to 4.0. Well, it's not extremely difficult and things are going well so far. However, I've hit a small snag. I keep getting a NullReferenceException when I run this code:
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I'm trying to call a dataadapter funtion to pass browser information to a database table upon logged in. I have also tried not assigning the function to an interget by setting the fucntion to not return a value. However in either case I get the System NullReferenceException.
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I have some inline code in an aspx file that executes:
<dd><%= encode(Listing.Address.Line1) %> </dd>
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Does the following code below look right?
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Code:
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When I click on my btnMissionary_Click which is suppose to add a datatable row I am getting the following error:
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Here is my form
HTML Code:
<div id="container">
[code].....
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System.NullReferenceException: Object reference not set to an instance of an object. at System.Web.Mvc.JsonValueProviderFactory.GetValueProvider(ControllerContext controllerContext) at System.Web.Mvc.ValueProviderFactoryCollection.<>c_DisplayClassc.b_7(ValueProviderFactory
factory) at System.Linq.Enumerable.WhereSelectEnumerableIterator[Code]....
2.MoveNext()
at
System.Collections.Generic.List[Code]....
1
collection) at
System.Linq.Enumerable.ToList[TSource](IEnumerable`1
source) at
System.Web.Mvc.ValueProviderFactoryCollection.GetValueProvider(ControllerContext
controllerContext) at
System.Web.Mvc.Controller.TryUpdateModel[TModel](TModel
model, String prefix)
... my own code from here on....
In case it matters, my controller has the following signature:
[Code]....
My guess is that this has to do with the new way DI works in MVC3, but I can't figure out what I'm doing wrong. Perhaps there is something in terms of DI setup that is required in MVC 3, but wasn't required in MVC 2?
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Feb 16, 2010
I am getting an exception like"NullReferenceException was unhandled by usercode-Object reference not set to an instance of an object." in (IEnumerable)Viewdata.Model.
<% foreach (EmployeeMaster m in (IEnumerable)ViewData.Model)
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Oct 26, 2010
This is what I'm trying to run:
[Code]....
When I browse to www.mysite.com/mycontroller/myaction/myid, everything works ok. But visiting www.mysite.com/mycontroller/myaction produces:Server Error in '/' Application.Object reference not set to an instance of an object.Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.
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