error handling in C# - C# Discussion Boards

Re: Interface Type-casting problem

26-Mar-06 4:27

Do you cast it into the actual interface that the class uses, or have you just created an interface with the same name in your code?

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hhrafn26-Mar-06 5:56

hhrafn

26-Mar-06 5:56

Uhm.. yes .. well.. yeah, I was using two interfaces (one in each project) both with the same name. Dead | X|

Once I referenced to the other one everything started to work Cool | :cool:

Thanks for the help, I just love it when the solution is too simple :P

error handling in C#

Mridang Agarwalla26-Mar-06 4:13

26-Mar-06 4:13

If I was writing a program and wanted to trap 'all' the errors in the program, would I have put try-catch blocks 'everywhere' in my code? Is that the only way to do it? It's better to gracefully exit the program displaying the reason for the crash to the user, rather than having a .Net framework message popup with some mumbo jumbo.

Re: error handling in C#

Guffa26-Mar-06 4:22

26-Mar-06 4:22

Put try-catch blocks around the code where you anticipate errors, like database calls, file handling, and other stuff that rely on external resources. Catch the Application.TreadException exception to handle any unforseen errors.

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Re: error handling in C#

Mridang Agarwalla26-Mar-06 4:35

Why does this string not work?

26-Mar-06 4:35

I've never used Application.ThreadException. How do I use it? Any quickie examples?

KaKa'26-Mar-06 3:55

KaKa'

26-Mar-06 3:55

Hello,
I am using C# to call a javascript function.
The original c# code is :

private const string AttachContextMenu = "return __showContextMenu({0});"; //this is the string which represents the javascript function

//then I use string.format on the string constant
public string GetMenuReference()
{
return String.Format(AttachContextMenu, Controls[0].ClientID);
}

//finally, the javascript is called upon the 'oncontextmenu' event
ctl1.Attributes["oncontextmenu"] = GetMenuReference();

But when I changed the GetMenuReference() method to the following,

return String.Format("return _showContextMenu({0});",Controls[0].ClientID);

the javascript function does not work anymore!! All I did was to replace the const variable with the actual string itself. How come it doesnt work already?

Guffa26-Mar-06 4:23

26-Mar-06 4:23

Because you are calling a function that does not exist. Replace "_showContextMenu" with "__showContextMenu".

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KaKa'26-Mar-06 13:31

KaKa'

26-Mar-06 13:31

hi,
Both functions above (_showContextMenu) are the same

Is there a typo?

Christian Graus26-Mar-06 13:45

Christian Graus

26-Mar-06 13:45

return __showContextMenu({0}

Christian Graus - Microsoft MVP - C++

Guffa27-Mar-06 0:11

Running Sql Script From C#?

27-Mar-06 0:11

No, they are not the same. Look again.

Tip: Count the number of underscore characters in the beginning of the name.

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majidbhutta26-Mar-06 3:43

majidbhutta

26-Mar-06 3:43

HI!
I have a sql script file(myscript.sql size 60k) When i run this script in a query analyzer it runs fine but when i makes its a Stored procedure so as i may be able to call it from my C# application. But sql doesnt allow me to amke a sp of it as it raises a lot of errors. Whats the real problem. I want to make this script a Stored Procedure so as i may be able to call it from my Application. Whats he solution to it. Should i be to remove all go Statements or anything else in sql Script.Or is there any other way round to do this. Solution required
THNX In Advance

Re: Running Sql Script From C#?

Colin Angus Mackay26-Mar-06 3:53

Colin Angus Mackay

26-Mar-06 3:53

majidbhutta wrote:
I want to make this script a Stored Procedure so as i may be able to call it from my Application

You don't have to make a SQL Script a Stored procedure in order to run if from a C# application. Any SQL can be put in the CommandText propery of a SqlCommand.

majidbhutta wrote:
Should i be to remove all go Statements or anything else in sql Script.

The GO is not SQL. It is a pre-processor command to Query Analyzer to tell it where to split the script into batches.

When Query Analyzer encounters a GO while processing CREATE PROCEDURE statment it treats it as the end of the stored procedure. Everything after the GO will be in a new batch and not the stored procedure - That is likely to be the cause of the error.

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An attempt was made to load a program with an incorrect format

Colin Angus Mackay26-Mar-06 2:05

Colin Angus Mackay

26-Mar-06 2:05

I'm using NUnit to test my application but it is giving me odd error messages that I have not seen before. I'm at a loss to think what configuration change I have made that would break NUnit. (Or what configuration changes I made at all) The application is new, so these are new unit tests fixtures. I also upgraded to NUnit 2.2.7 in case there was a problem with the previous version (no luck). My application runs okay if I launch it, yet I cannot test it.

Here is the message produced by using the NUnit console through TestDriven.NET:

------ Test started: Assembly: NOsm.Dao.Testing.dll ------<br />
<br />
TestCase 'M:NOsm.Dao.Testing.BookmarkDaoTest.SimpleTest'<br />
failed: Could not load file or assembly 'NOsm.Dao.Testing' or one of its dependencies. An attempt was made to load a program with an incorrect format.<br />
	System.BadImageFormatException: Could not load file or assembly 'NOsm.Dao.Testing' or one of its dependencies. An attempt was made to load a program with an incorrect format.<br />
	File name: 'NOsm.Dao.Testing'<br />
	at System.Reflection.Assembly.nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, Assembly locationHint, StackCrawlMark& stackMark, Boolean throwOnFileNotFound, Boolean forIntrospection)<br />
	at System.Reflection.Assembly.InternalLoad(AssemblyName assemblyRef, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection)<br />
	at System.Reflection.Assembly.InternalLoad(String assemblyString, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection)<br />
	at System.Reflection.Assembly.Load(String assemblyString)<br />
	at TestDriven.TestRunner.AdaptorTestRunner.Run(ITestListener testListener, ITraceListener traceListener, String assemblyPath, String testPath)<br />
	at TestDriven.TestRunner.ThreadTestRunner.Runner.Run()<br />
	<br />
	WRN: Assembly binding logging is turned OFF.<br />
	To enable assembly bind failure logging, set the registry value [HKLM\Software\Microsoft\Fusion!EnableLog] (DWORD) to 1.<br />
	Note: There is some performance penalty associated with assembly bind failure logging.<br />
	To turn this feature off, remove the registry value [HKLM\Software\Microsoft\Fusion!EnableLog].<br />
<br />
<br />
<br />
0 passed, 1 failed, 0 skipped, took 0.89 seconds.

The code for SimpleTest is:

[Test]
public void SimpleTest()
{
    Assert.IsFalse(true);
}

If I use the NUnit GUI I get a slightly different exception:

System.IO.FileNotFoundException...<br />
<br />
Server stack trace: <br />
   at System.Reflection.Assembly.nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, Assembly locationHint, StackCrawlMark& stackMark, Boolean throwOnFileNotFound, Boolean forIntrospection)<br />
   at System.Reflection.Assembly.InternalLoad(AssemblyName assemblyRef, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection)<br />
   at System.Reflection.Assembly.InternalLoad(String assemblyString, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection)<br />
   at System.AppDomain.Load(String assemblyString)<br />
   at NUnit.Core.Builders.TestAssemblyBuilder.Load(String assemblyName)<br />
   at NUnit.Core.Builders.TestAssemblyBuilder.Build()<br />
   at NUnit.Core.Builders.TestAssemblyBuilder.Build(String testName)<br />
   at NUnit.Core.TestSuiteBuilder.Build(String assemblyName, String testName)<br />
   at NUnit.Core.SimpleTestRunner.Load(String assemblyName, String testName)<br />
   at NUnit.Core.SimpleTestRunner.Load(String assemblyName)<br />
   at NUnit.Core.ProxyTestRunner.Load(String assemblyName)<br />
   at NUnit.Core.ProxyTestRunner.Load(String assemblyName)<br />
   at System.Runtime.Remoting.Messaging.StackBuilderSink._PrivateProcessMessage(IntPtr md, Object[] args, Object server, Int32 methodPtr, Boolean fExecuteInContext, Object[]& outArgs)<br />
   at System.Runtime.Remoting.Messaging.StackBuilderSink.PrivateProcessMessage(RuntimeMethodHandle md, Object[] args, Object server, Int32 methodPtr, Boolean fExecuteInContext, Object[]& outArgs)<br />
   at System.Runtime.Remoting.Messaging.StackBuilderSink.SyncProcessMessage(IMessage msg, Int32 methodPtr, Boolean fExecuteInContext)<br />
<br />
Exception rethrown at [0]: <br />
   at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)<br />
   at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)<br />
   at NUnit.Core.TestRunner.Load(String assemblyName)<br />
   at NUnit.Util.TestDomain.Load(String assemblyFileName, String testFixture)<br />
   at NUnit.Util.TestLoader.LoadTest(String testName)

Any help would be appreciated.

ColinMackay.net
Scottish Developers are looking for speakers for user group sessions over the next few months. Do you want to know more?

-- modified at 8:06 Sunday 26th March, 2006

Re: An attempt was made to load a program with an incorrect format [SOLVED]

Colin Angus Mackay27-Mar-06 9:17

Colin Angus Mackay

27-Mar-06 9:17

Okay - I've tracked down the problem. Somehow or another the project properties for the testing assembly were set to build for a 64-bit platform. I'm not sure how that happened - but it's fixed now.

ColinMackay.net
Scottish Developers are looking for speakers for user group sessions over the next few months. Do you want to know more?

Grid computing

Mridang Agarwalla26-Mar-06 0:00

26-Mar-06 0:00

Has anyone come across a Grid Computing project in .NET? I scoured the Internet but couldn't find anything much?

Re: Grid computing

Guffa26-Mar-06 1:17

Another small listview problem

26-Mar-06 1:17

Funny, I find quite some on a simple search like this[^]...

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Mridang Agarwalla25-Mar-06 23:50

Re: Another small listview problem

25-Mar-06 23:50

I have a listview control on my form. How can I check if an item is selected or not? If I use

ListView1.FocusedItem.Index

and an item isnt selected, i get an error. How should I get around this?

Stefan Troschuetz25-Mar-06 23:54

Stefan Troschuetz

25-Mar-06 23:54

if (ListView1.FocusedItem != null)
  ListView1.FocusedItem.Index

www.troschuetz.de

Re: Another small listview problem

Mridang Agarwalla26-Mar-06 0:13