Accessing components created during runtime

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  - 1
    - dll methods when imported working in window application and not working in web application Hi sridhar, So ,it seems it's not the problem with delt1 (certainly it's not null),since the delt1.Map = "Event4_Map-LLS.dtm" statement is not giving u any error.If u admit the code upto here is valid(like delt1 is not null),then it should be the method ExceuteMap() definitely,creating the problem.Is it a standard method or implemented by ur team I think this Delta.Executor.1 is ur own customized ActiveX contol.So review(if possible debug) the implementation of ExecuteMap,definitely ,some where ,some object is being used with out initialized properly.That could be the reason,i'm sure. Thanx, Ch.T.Gopi Kumar. Tag: Visual C# General Accessing components created during runtime Visual C#
  - 2
    - Windows Service as middleman between client desktop app and Database Hmmm...are you saying encrypt the credentials for 'Windows Authentication' I thought WA meant anybody could login (cos I need to allow for remote access) if you knew the server name/port Are you able to encrypt access on the server-side (in SQL Server) and provide the key in code for the app to give I appreciate your insight, thanks. Tag: Visual C# General Accessing components created during runtime Visual C#
  - 3
    - Multi Interface inheritance The problem is actually that the library with the interfaces was written in 1.1. If they were in 2.0, they would have been: interface IA: IComparable<IA> Then the CompareTo function is very clear. Since I don't have access to the libraries I have a way around it but I need to know the best way to check if an object implements a particular interface.... I figure I could do something like this: int CompareTo(object obj) { bool implementsIA, implementsIB = true; // I know the following code doesn't work. I'm looking for a recommendation on what to use for the "implements" function if(obj implements IA && obj implements IB) { // compare as IA and IB } if(obj implements IA) { // Code to compare this as an IA } if(obj implents IB) { // Code to compare this as an IB } } What's the best way to check for an interface Tag: Visual C# General Accessing components created during runtime Visual C#
  - 4
    - New bug added in VS 2005 SP1? "Unreachable code detected" warning. Has anyone else experienced this The following code now generates a warning saying "Unreachable code detected". This is new since applying VS 2005 SP1. The warning is given on the throw statement below. public DateTime CurrentTime { set { if (value == null) { throw new ArgumentNullException(); // Error here. } currentTime = value; } } It implies that the value passed in to the setter could never be null which is obviously not true. I just started getting this warning after upgrading with SP1. Tag: Visual C# General Accessing components created during runtime Visual C#
  - 5
    - DataGridView - KeyDown and KeyPress events I've tried and made it. Here is the custom DataGridView code: using System; using System.Collections.Generic; using System.Text; using System.Windows.Forms; public class MyDataGridView : DataGridView { protected override bool ProcessDialogKey( Keys keyData) { if (keyData == Keys .Enter) { DataGridViewCell cell = CurrentCell; base .ProcessDialogKey(keyData); CurrentCell = cell; return true ; } return base .ProcessDialogKey(keyData); } protected override bool ProcessDataGridViewKey( KeyEventArgs e) { if (e.KeyCode == Keys .Enter) return true ; return base .ProcessDataGridViewKey(e); } } Thank you Tag: Visual C# General Accessing components created during runtime Visual C#
  - 6
    - How do I get the application directory sorry getExecutingAssembly().Location if you use the intellisense.. you could have found it Tag: Visual C# General Accessing components created during runtime Visual C#
  - 7
    - Silence detection between songs I have converted a cassette into a WMP one digital file which has 3hours of many songs. I like to be able to navigate media player song by song by having it detect the silence between each song, within this one media file. I am using MediaPlayer library in C#. Please provide a code that will allow this feature. Tag: Visual C# General Accessing components created during runtime Visual C#
  - 8
    - Translating from vb Hi, Does anyone know how I would go about converting the following code into C# Partial Class Login Inherits System.Web.UI.Page Protected Sub Login1_LoginError( ByVal sender As Object , ByVal e As System.EventArgs) Handles Login1.LoginError 'Set the parameters for InvalidCredentialsLogDataSource InvalidCredentialsLogDataSource.InsertParameters( "ApplicationName" ).DefaultValue = Membership.ApplicationName InvalidCredentialsLogDataSource.InsertParameters( "UserName" ).DefaultValue = Login1.UserName InvalidCredentialsLogDataSource.InsertParameters( "IPAddress" ).DefaultValue = Request.UserHostAddress 'The password is only supplied if the user enters an invalid username or invalid password - set it to Nothing, by default InvalidCredentialsLogDataSource.InsertParameters( "Password" ).DefaultValue = Nothing 'There was a problem logging in the user 'See if this user exists in the database Dim userInfo As MembershipUser = Membership.GetUser(Login1.UserName) If userInfo Is Nothing Then 'The user entered an invalid username... LoginErrorDetails.Text = "There is no user in the database with the username " & Login1.UserName 'The password is only supplied if the user enters an invalid username or invalid password InvalidCredentialsLogDataSource.InsertParameters( "Password" ).DefaultValue = Login1.Password Else 'See if the user is locked out or not approved If Not userInfo.IsApproved Then LoginErrorDetails.Text = "Your account has not yet been approved by the site's administrators. Please try again later..." ElseIf userInfo.IsLockedOut Then LoginErrorDetails.Text = "Your account has been locked out because of a maximum number of incorrect login attempts. You will NOT be able to login until you contact a site administrator and have your account unlocked." Else 'The password was incorrect (don't show anything, the Login control already describes the problem) LoginErrorDetails.Text = String .Empty 'The password is only supplied if the user enters an invalid username or invalid password InvalidCredentialsLogDataSource.InsertParameters( "Password" ).DefaultValue = Login1.Password End If End If 'Add a new record to the InvalidCredentialsLog table InvalidCredentialsLogDataSource.Insert() End Sub Protected Sub Page_Load( ByVal sender As Object , ByVal e As System.EventArgs) Handles Me .Load 'If the person is already logged in, but is being redirected to the login page from some other 'page, then they were attempting to visit a page they weren't authorized for If Request.IsAuthenticated AndAlso Request.QueryString( "ReturnUrl" ) IsNot Nothing Then LoginErrorDetails.Text = "You are logged in, but have attempted to visit a page for which you are not authorized." End If End Sub End Class Cheers, Mark Tag: Visual C# General Accessing components created during runtime Visual C#
  - 9
    - How can we read the properties of song selected from the fileupload control Hi, i will upload one song from fileupload control at this time i would like to read the advanced properties of selected song, advanced properties like Album, Author, Title, Duration etc., of the selected song. How to do this Thanks Vishwanath Tag: Visual C# General Accessing components created during runtime Visual C#
  - 10
    - isNull check and c# operators confusion have a simple case where I wan to do this shorter if (customerSource.Name!= null) { destinationCustomer._NAME == customerSource.Name; } else { destinationCustomer.Name = " "; } >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> why can't I do this Like this destinationCustomer = !! customerSource.Name : " "; *!! will check the condition is null or not, if not nul nul than it assigns customer.Name,if null than it assigns " " is there a syntax I am missing Tag: Visual C# General Accessing components created during runtime Visual C#
  - 11
    - C# Application too slow after converting from Framework 1.1 to 2.0 Hi. I recently upgraded my application (framework 1.1) to framework 2.0. Visual Studio 2005 converted the application with no problem. When I build and run the application it is extremely slow. I am clue less. If any one can help me with it. Thanks Tag: Visual C# General Accessing components created during runtime Visual C#
  - 12
    - How to add 3 item project template to 2 or more projects? I have 2 project : Winform , DataAccess in main solution . I want to add 3 new item into them , 2 for Winform and 1 for DataAccess by custom item project template wizard . I tried to create one by implement IWizard , but I can only add 3 item to current project. I readed many documents but still can't find out the solution for this problem . Please help me to solve this problem . Thank you very much . P.S : I am using VS2005 Tag: Visual C# General Accessing components created during runtime Visual C#
  - 13
    - menu font selection hello everyone, i have been trying to get this figured out, trying to create a menu in C# which has the options to select the different fonts available on the system. Anyone have an easy way to get this done i have been to numerous sites, still confused! Tag: Visual C# General Accessing components created during runtime Visual C#
  - 14
    - Generic casting hi i would like to know why this is not possible ! ! Code Snippet public interface INewClass { } public class NewClass : INewClass { } public class A<C> where C : INewClass { private C obj; public A() { obj = new NewClass(); } } got error imlicit converting not possible from "NewClass" to "C". ok i thougt let’s try explizit cast. Code Snippet public interface INewClass { } public class NewClass : INewClass { } public class A<C> where C : INewClass { private C obj; public A() { obj = (C)new NewClass(); } } got error cast from "NewClass" to "C" not possible. why is the behaviour so, for the compiler are enough information present or not ! ! Tag: Visual C# General Accessing components created during runtime Visual C#
  - 15
    - Help! Interop Every Body Thanks a lot, for you help, I reinstall a VB 6 and put SP 6 again and all apears ok. (For this I never work in VB6) here I ready for next round. Tag: Visual C# General Accessing components created during runtime Visual C#
  - 16
    - Feedback on Generics Prototype I am building a generic data mapper factory and would like any feedback on the following snippet which would represent the mapper factory. In the code below, MyEntity is a custom entity that is hyrdated by the MyEntityMapper which implements IDataMapper<T> (constructing T as MyEntity in the implementation). The client would call the method as follows: IDataMapper < MyEntity > mapper; mapper = DataMapper .GetMapper< MyEntity >(); MyEntity entity = mapper.FindSingle< int >(5); Specifically, I am interested in any concerns around the way I determine the type of T, and, if the resulting API could be any cleaner or more efficient: public static IDataMapper <T> GetMapper<T>() where T: new () { T m_type = new T(); if (m_type is MyEntity ) { IDataMapper < MyEntity > map = new MyEntityMapper (); return ( IDataMapper <T>) map; } return ( IDataMapper <T>) null ; } Many thanks. Rick Tag: Visual C# General Accessing components created during runtime Visual C#
- Next
  - 1
    - IDE shuts down immediately Hi all, I'm having an issue with the C# express IDE in that it shuts itself down shortly after I open it. It was coming up and showing the start page which would have a message saying "There is no content available yet. Content will be downloaded once a connection to the internet is established." Which is weird, because I do have a connection established. But after showing that message briefly, the IDE closes. I was able to avoid this in the short term by very quickly navigating to Tools >> Options >> Show All Settings >> Startup and disabling content download. However, any time I try to start a new project or anything the IDE still shuts down. It will also shutdown if I re-enable content downloading. Anyone have any ideas I'm really eager to get started on some XNA projects, but it's pretty much impossible with the IDE in this state! Tag: Visual C# General Accessing components created during runtime Visual C#
  - 2
    - Strange Problem...Help Hi everybody there. I developed an application that uses a serial connected device. This device sends a large number of incoming data to my computer. I managed to handle all this data and store it in 2D array struct. My problem is that some times the application crashes. What might be wrong When my program crashes all data the is being printed in an output file correctly. What might be the problem and how can I overcome it I would really appreciate any help of you. Thank you in advance. Tag: Visual C# General Accessing components created during runtime Visual C#
  - 3
    - The type initializer for 'Class' threw an exception I get an exception 'The type initializer for 'Class' threw an exception' when calling a class through a separate application domain. If i call on the code directly without creating another appdomain then things run fine. This class have a few static members and methods. Seems like all the public static properties of that class failed to initialize throwing System.TypeInitializationException. Any idea on whats going on here Thanks. More example of the pseudo-code: Create new app domain create instance of PUB class and unwrap (PUB inherits from ..MarshByRef..) PUB.method() // call on the method from PUB class, now this will call on other objects to do work, and eventually one of the object threw exception 'The type initializer for 'Class' threw an exception' Tag: Visual C# General Accessing components created during runtime Visual C#
  - 4
    - Calling unmanaged objects!! Hello, I got a library that is unmanaged and not a member of the COM interface. I tried to add reference to it in VS but it cannot be imported. The library class is object oriented like the following: public class movie { public movie(string movieName,bool persist){} public int getDuration(); } I got these info from the API documentation of the lib. Now is there anyway to call the method getDuration I thought about creating a proxy for the class then calling Activator.CreateInstance(), But i am not sure about how to do so!! Thanks in advance and regards Tag: Visual C# General Accessing components created during runtime Visual C#
  - 5
    - Interface vs Abstract class Greets! From my reading: If you add a new method to an interface, you must track down all implementations of that interface in the universe and provide them with a concrete implementation of that method. If you add a new method to an abstract class, you have the option of providing a default implementation of it. Then all existing code will continue to work without change. In the following code snippet, a new method is added in the abstract class with default implementation (Am I right ). How about adding a new abstract method in the abstract class Is it possible to provide a default implementation of it Thanks. using System; abstract class BaseClass { public abstract void myMethod(); public void newMethod() { Console.WriteLine("This is new method"); } } class DerivedClass1 : BaseClass { public override void myMethod() { Console.WriteLine("This is abstract method overridden in DerivedClass1"); } } class DerivedClass2 : BaseClass { public override void myMethod() { Console.WriteLine("This is abstract method overridden in DerivedClass2"); } } class MainClass { static void Main() { BaseClass bc = new DerivedClass1(); bc.myMethod(); bc = new DerivedClass2(); bc.myMethod(); } } Tag: Visual C# General Accessing components created during runtime Visual C#
  - 6
    - Constraints in generic clases Hi, luben By using attributes, it will create alert info in compiling time. I think it can do what you want according to your description. For example: public class Class { [Obsolete("Don't use this old method, use New method", true)] static void Old( ) { } static void New( ) { } public static void Main( ) { Old( ); } } When we try to compile above program, we will get an error: AnyClass.Old()' is obsolete: 'Don't use Old method, use New method' So you can use it to avoid whatever invalid methods which you dont want to use. Forgive me not showing you all the code. You can reference to C# attributes and custom attributes . Thank you Tag: Visual C# General Accessing components created during runtime Visual C#
  - 7
    - reference object not updated i found a way to put myStr into outStr and that way to make outStr ="A" from inside the thread : override public void RunThread() { String myStr = "A"; myDelegateFunc(myStr); // calling delegate function of TCPIPComm class } } void myFunc(string tmpStr) { this.outStr = tmpStr // that way after myStr is terminated i still have "A" in outStr! } thank you for your help.... Tag: Visual C# General Accessing components created during runtime Visual C#
  - 8
    - [otp] Open Excel I'm trying to move an application from VB to C# and need to Open an instance of Excel so i can past some data to a worksheet. heres the code. Excel. Application oXL = New Excel. Application ; Excel. Workbook oWB = New Excel. Workbook ; Excel. Worksheet oSheet = New Excel. Worksheet ; I'm getting red squiggly lines under the words "Excel" and when I hove the cursor over the squiggly lines it says "; expected" I have a refernce to excel in the project. does anyone know what I'm doing wrong Thanks, Billy Using Office 2003 and VS2005 Tag: Visual C# General Accessing components created during runtime Visual C#
  - 9
    - extract resource file in c# Hi, System.IO.File.Copy can copy between some specific path file to another. The resource are in the resources folder. Thanks Tag: Visual C# General Accessing components created during runtime Visual C#
  - 10
    - Internet Transfer Control thank you very much for your good answer ... and hope it works Tag: Visual C# General Accessing components created during runtime Visual C#
  - 11
    - VS2005 Crashes after Rebuilding the Solution Hello Suma, thanks for the tip with the symbols. Here is a better version of the callstack: kernel32.dll!_RaiseException@16 () + 0x52 Bytes mscorwks.dll!ReportStackOverflow() + 0x81 Bytes mscorwks.dll!Alloc() + 0x215f0f Bytes mscorwks.dll!FastAllocateObject() + 0x34 Bytes mscorwks.dll!JIT_NewFast() + 0x93 Bytes System.Design.ni.dll!66267bd7() I couldn't load symbols for the devenv.exe the fileversion is 8.0.50727.762 built by: SP Regards Bastian Trompetter Tag: Visual C# General Accessing components created during runtime Visual C#
  - 12
    - Unable to cast COM object of type 'AcroPDFLib.AcroPDFClass' to interface type 'AcroPDFLib.IAcroAXDocShim Hi I am writing a code in c# which will find the version of pdf document. I am using Acrobat assemblies for that. I wrote the following code lines.I am using VS2005. AcroPDFLib. AcroPDFClass apc= new AcroPDFLib. AcroPDFClass (); apc.LoadFile( "c:\\licenceAgree.pdf" ); bool loading=apc.LoadFile( "c:\\licenceAgree.pdf" ); object obj= apc.GetVersions(); When control comes at apc.LoadFile( "c:\\licenceAgree.pdf" ); it throws the following exception. Unable to cast COM object of type 'AcroPDFLib.AcroPDFClass' to interface type 'AcroPDFLib.IAcroAXDocShim'. This operation failed because the QueryInterface call on the COM component for the interface with IID '{3B813CE7-7C10-4F84-AD06-9DF76D97A9AA}' failed due to the following error: No such interface supported (Exception from HRESULT: 0x80004002 (E_NOINTERFACE)). Please provide some help. Thanks Rajesh Tag: Visual C# General Accessing components created during runtime Visual C#
  - 13
    - Is there a way to plug-in or register dll modules so dll proxy can know their presence during run-time? Looking for classes implementing IFooBar (which has one method: Initialize): Code Block DirectoryInfo directory; directory = new FileInfo(new Uri(Assembly.GetExecutingAssembly().GetName().Codebase).LocalPath).Directory; foreach(FileInfo file in directory.GetFiles()) { Assembly assembly; try { assembly = Assembly.LoadFrom(file.FullName); foreach(Type type in assembly.GetTypes()) { if(typeof(IFooBar).IsAssignableFrom(type) && !type.IsAbstract) { IFooBar fooBar = (IFooBar)Activator.CreateInstance(type); fooBar.Initialize(); } } } catch { continue; } } Tag: Visual C# General Accessing components created during runtime Visual C#
  - 14
    - Help refactoring a method Well, as far as I can see, everything in each of the if (ProductType == ".....") block is identical, (except for the variable name, which is irrelevant), so keep the first one, delete the other two, and remove the if() at the start of it. Note, that your current code has two bugs in it already. You need to assign a prAudioID value for Samples in the switch at the top, and put curly braces around the verbose logging block. Actually, I spotted a couple more glaring errors, so I'm beginning to think that this is a homework assignment. Tag: Visual C# General Accessing components created during runtime Visual C#
  - 15
    - c++ or any other language in c# Hi i was not sure whre to post this... i use c# (in visual studio 2005) but I would like to know if it is not possible to create a class in a different laguage in a c# application for example if my friend writes a c++ class I want to use and acces it with C# code so can a make a region of code be in anoter language while my main program is in c# is this possible at all thanks szsz Tag: Visual C# General Accessing components created during runtime Visual C#
  - 16
    - Not able to run a .net exe from a .net service Hi ! I have a problem in executing a .net exe from a .net service. Its not executing the .net exe. Also its not throwing any exception in this regard. Can anyone tell me how to solve this or how to execute a .net exe from a .net service.. I have written the following code in "filesystemwatcher". Its executing the "Console.Beep()" exactly as its required to. But its not executing the exe. Process FTPProcess = new Process(); FTPProcess.StartInfo.UseShellExecute = false; FTPProcess.StartInfo.FileName = "<Path of the exe file>"; FTPProcess.StartInfo.Arguments = "<input parameters for the exe>"; FTPProcess.Start(); FTPProcess.WaitForExit(); Tag: Visual C# General Accessing components created during runtime Visual C#

CEMc

I am creating multiple labels during runtime and giving them specific names. How do I use these names to access the values related to each label.

For instance, I create 20 labels entitled Player##, where ## is a number from 00 through 99. I then want to change the Visible or Enabled properties of these labels that have names, preferably by doing something along the lines of ("Player"+playernum).Visible=true. Is there anyway to do this simply I can use arrays and the like, but would rather not have to search through an array every time I want to access this component since it has a name assigned to it.

Re: Visual C# General Accessing components created during runtime

Brendan Grant

Because all of your controls would be contained within some kind of container (Form, Panel, GroupBox, etc)... you can use the containers Controls property and look it up based on name like so:

Label l = new Label();
l.Text = "Hello World";
l.Name = "MyLabel";

this.Controls.Add(l);

l = null;

l = (Label)this.Controls["MyLabel"];
l.Text = "Foo";

Remember that when we look it up by name, we are looking based on the value of the controls Name property, not the variable name in code.

Is this what you are looking for

Re: Visual C# General Accessing components created during runtime

Vivek Ragunathan

Hi

You can maintain a collection of the Labels that you create and add, say List<Label>. And then use that to perform a lookup. Or use the Form.Controls property.

Regards

Re: Visual C# General Accessing components created during runtime

Sanophy

Honestly, after trying to do this myself, the best option is to make an array of labels...
Name the array Player, and the index can be your number...