I have an ASP.NET application and need to use some COM components inside it.
I need a wrapper class over Func or Action which creates a new STA thread and run the delegate with that thread or something like this. Do you know such a class or library out of the box or a sample code ?
CodeUsingComComponent.InvokeSTA()
I want to remove checked items from checklistbox (winform control) in class file method which i am calling asynchronously using deletegate. but it showing me this error message:-
Cross-thread operation not valid: Control 'checkedListBox1' accessed from a thread other than the thread it was created on.
i have tried invoke required but again got the same error. Sample code is below:
[code]....
How can we debbug a multi-thread program to see local variables of each thread using visual studio 2008.
View 1 RepliesI'm new to threading and have used it successfully, but limited. I can spawn a thread and have the main thread reference variables in the spawned thread, but I don't know how to allow the spawned thread to reference (and update) variables in the main thread.
Any example threading code I've seen on the web appears to be WAY more complicated than what I do, so I am unable to understand or integrate into my code.
Here is a quick example of how I use threading:
[code].....
I am reading the Asp.net security documentation on msdn.I come across these tow terms and get really confused.
# WindowsIdentity = WindowsIdentity.GetCurrent()
which returns the identity of the security context of the currently executing Win32 thread.
# Thread = Thread.CurrentPrincipal
which returns the principal of the currently executing .NET thread which rides on top of the Win32 thread.
I have a password page and when someone enters an incorrect password I want to simply foil a brute force attack by having
bool isGoodPassword = (password == expected_password);
lock (this)
{
if (!isGoodPassword)
Thread.Sleep(2000);
}
I would expect that this would allow all correct passwords without stalling, but if one user enters a bad password another successful password from a different user would also be blocked. However, the lock doesn't seem to lock across ASP.NET threads.
I want a example of multithreading .i want to use it in a web form not on console.i am using C#.net .and how to use thread.sleep method for a particular thread.
View 5 Replieswhat is the use of delegates. why we use delegates.
View 1 Replieswhy delegates are using in event handling?what is the advantages of using delegates in event handling?
View 4 RepliesI have a standard web app. My default page has a WebMethod and the WebMethod gets invoked by Json from client script. On my webForm I have an area that displays messages to the user showing the stage in the process and this is just a <asp:label>. if The webmethod had been a standard method, I would simply have done something like myLabel.Text = "sometext". However, the webMethod knows nothing about the label and so I need to bubble the value to the form. If I had called the webmethod from the codebehind in the form I may have been able to use delegates/events, but the call was made by the client, so I have not wired the webmethod up to any codebehind. How do I push my text back to the form in an asyncronous manner. So the code works in this way: Form load populates some controls on the client. The user perfoms some drag and drop then presses a standard html input button that calls a client ajax/json method passing the dragged values to the webmethod. I then need to feed back to the screen at several points in the webmethod process to inform the user of the current status.
View 5 Replies[Code]....
How to bind multiple delegates to an event?
Presently i used user control in my total application. i wrote single delegate , single event in to forms like this.
In User Control :
public delegate void onCloseClick();
public event onCloseClick OnCloseClick;
In Form :
In form load i declared --> this.devXToolRibbon1.OnCloseClick += new UBS.Phoenix.WinForm.Common.DevUI.DevXToolRibbon.onCloseClick(devXToolBar1_OnCloseClick);
i implemented event like this...
void devXToolBar1_OnCloseClick()
{
Form.close();
}
i know this much only about delegates & events... when we will bind multiple delegates to an event?
I'm using the mock framework to unit test some methods. I came across some methods that use delegates. I did not find a way to setup these delegates to return the objects that I want. The mock framework does not support it as far as I know. Is this supported in other mock frameworks like nMock?
View 3 RepliesCan somebody justify this statement with example: delegates represent methods that are callable without knowledge of the target object. i am not getting how we are hiding the function name at the UI.
View 4 RepliesI'm trying to create a control out of a class I found, and one of the overridden functions is the following:
protected override void PerformDataBinding(IEnumerable data)
However, when I try to build the control I'm getting the error as shown in the subject. I've tried searching, and it seems the signature for the original function matches the one I have, and all other solutions I've seen uses the same signature.
What is the difference between generic and non-generic collection?
View 1 RepliesMy understanding of Factory Method Pattern is (Correct me if i am wrong) Factory Method Pattern "Factory Method allow the client to delegates the product creation (Instance Creation) to the subclass". There are two situation in which we can go for creating Factory Method pattern.
(i) When the client is restricted to the product (Instance) creation.
(ii) There are multiple products available.But a decision to be made which product instance need to be returned. If you want to create Abstract Method pattern
You need to have abstract product Concrete Product Factory Method to return the appropriate product.
public enum ORMChoice
{
L2SQL,
EFM,
LS,
Sonic
}
//Abstract Product
public interface IProduct
{
void ProductTaken();
}
//Concrete Product
public class LinqtoSql : IProduct
{
public void ProductTaken()
{
Console.WriteLine("OR Mapping Taken:LinqtoSql");
}
}
//concrete product
public class Subsonic : IProduct
{
public void ProductTaken()
{
Console.WriteLine("OR Mapping Taken:Subsonic");
}
}
//concrete product
public class EntityFramework : IProduct
{
public void ProductTaken()
{
Console.WriteLine("OR Mapping Taken:EntityFramework");
}
}
//concrete product
public class LightSpeed : IProduct
{
public void ProductTaken()
{
Console.WriteLine("OR Mapping Taken :LightSpeed");
}
}
public class Creator
{
//Factory Method
public IProduct ReturnORTool(ORMChoice choice)
{
switch (choice)
{
case ORMChoice.EFM:return new EntityFramework();
break;
case ORMChoice.L2SQL:return new LinqtoSql();
break;
case ORMChoice.LS:return new LightSpeed();
break;
case ORMChoice.Sonic:return new Subsonic();
break;
default: return null;
}
}
}
**Client**
Button_Click()
{
Creator c = new Creator();
IProduct p = c.ReturnORTool(ORMChoice.L2SQL);
p.ProductTaken();
}
Is my understanding of Factory Method is correct?
I have written some reports in SSRS which can deployed to the reports server. What is the best way of invoking these reports from an MVC View ?
View 3 RepliesHow to invoking java web service(WSDL) with c# client (web application).Java web service methods is proxy.object will be created in client C#.Then how to call that proxy method in c# client? how to test that java web service in c# client side?
View 1 RepliesI have to call the function, when exception occured. Is it possible to call the function in Catch block (Try-Catch)? I have tried it but the function did not get invoked. What i have to do for it? Shall we unable to call the functions in Catch block? I have shown my code below.
Try
Catch ex As Exception
ErrorHandlers.LogErrorDetails(ex, Session("UserId").ToString, "")
Throw ex
End Try.
I knew, We can invoke this function in Finally block but i do not need as per my requirements.
I'm working on a web page that will be viewed on a blackberry (to start with). On the page I need to be able to add calendar events to the user's blackberry calendar or add new contact records to their contact list.
I've found the api on RIM's site that would allow this [URL] but I have no how to incorporate it into an asp.net page.
I assume I need to write inline javascript but I don't know how to import/include the API libraries that are required. Does anyone know how to do this or, better yet, have some sample code? If this is even possible, I think I just need to get past this hurdle and I'll be on my way (until I trip over the next one ).
In an ASP.Net application I am creating a Compiled Assembly Instance during Application Start. Then I want to invoke the methods as a user interacts with the controls on the Web Page. Currently I can invoke a method when i create the assembly during start up. however after wards the assembly is lost.
I am currently storing it at the Application Level as an object. I do the same thing in a windows app this all works fine. In ASP.Net it does not.
Where can i store the assembly object
Snippets Below
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I have a web forms page with a button that involkes a __doPostBack callback to the page. I would like to invoke this manually - by "manually" I mean from outside the webpage, for example by using wget.
View 5 RepliesI have a web forms page with a button that involkes a __doPostBack callback to the page. I would like to invoke this manually - by "manually" I mean from outside the webpage, for example by using wget.
View 3 RepliesI have what should be a relatively simple task that's frankly got me stumped. I've researched it until my brain is fried, and now I'm puntingHere's the scenario:I have an ASPX page (Q2.aspx) that is decorated with the WebService,WebServiceBinding, and ScriptService attributes. That page contains a method, GetAllContacts, that is decorated with the WebMethodattribute and returns a string containing JSON data. (For what it's worth, the pageitself contains no other controls or functionality.)I have an HTML page that contains JavaScript which uses the XmlHttpRequestobject to invoke the GetAllContacts WebMethod on the ASPX page and transformthe JSON data into an HTML table. I have verified that my Web.Config file contains the appropriate protocol handlersfor HttpGet and HttpPut in the WebServices section under System.Web.webServices.
I have verified that my Web.Config file contains the ScriptModule entry under theSystem.webServer.modules section, and that it matches the appropriate documentation.
However, when I view the HTML page in a browser, the following occur:The web request goes through, but the results are for the unprocessed HTML from the ASPX page.The GetAllContacts method is never invoked, as evidenced by setting a breakpoint in its code.The code to invoke the Web service, however, is invoked, and the JavaScript callbackfunction that is invoked upon request completion is properly invoked.
It appears that the JavaScript code is largely set up correctly, but for some reason that is completely escaping me at this point, the HTML page will simply not execute the WebMethod on the ASPX page, and simply returns the page as though it were a plain HTML GET request. Clearly, an HTML document can't be evaluated by JavaScript's eval function, which brings me to my problem. (Also note that the JSON data appears nowhere in the HTML that's returned.)I am, frankly, baffled. I've looked at dozens of Microsoft articles, StackOverflow posts, CodeProject articles, and who knows what else. My code looks like it's okay. But I know better. I'm missing something simple, stupid, and obvious. I just need someone to point it out to me.Below you'll find the ASPX page code and the HTML code, in the hope that they'll shed some light.ASPX Code
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Q2.aspx.cs" Inherits="Satuit.Q2" enablesessionstate="False" %>
<html>
<body>
[code]...