Re: What exceptions cannot be caught by try-catch block? - C# Discussion Boards

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Re: Directory.Exist

0x3c01-Apr-09 0:53

0x3c0

1-Apr-09 0:53

Do you mean you want to check if a directory path is FTP? If so, just use the string.StartsWith function - if it starts with ftp://, then it's an FTP directory

What exceptions cannot be caught by try-catch block?

devvvy31-Mar-09 22:04

devvvy

31-Mar-09 22:04

What exceptions cannot be caught by try-catch block?

StackOverflowException for one. (Just try write a simple infinite recursive function and invoke from a simple WIN32 console main)

What else?

dev

Re: What exceptions cannot be caught by try-catch block?

Pete O'Hanlon31-Mar-09 22:25

Pete O'Hanlon

31-Mar-09 22:25

There aren't that many that can't be caught. Off the top of my head, the only other one I can think of is an OutOfMemoryException.

"WPF has many lovers. It's a veritable porn star!" - Josh Smith

As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.

My blog | My articles | MoXAML PowerToys | Onyx

Re: What exceptions cannot be caught by try-catch block?

moon_stick31-Mar-09 22:58

moon_stick

31-Mar-09 22:58

Pete O'Hanlon wrote:
the only other one I can think of is an OutOfMemoryException.

I'm sure I've got code that catches those? Confused | :confused:

It definitely isn't definatley

Re: What exceptions cannot be caught by try-catch block? [modified]

devvvy31-Mar-09 23:05

devvvy

31-Mar-09 23:05

well here's one mysterious

<br />
try {<br />
   IPerson oPerson = ISession.Get(....);<br />
   ...<br />
   oSomeProperty = LoadProperty(...);    // still okay!! Successfully loaded oSomeProperty and it is not NULL or invalid.<br />
<br />
   oPersom.SomeProperty = null; // Okay!!<br />
   oPerson.SomeProperty = new PersonProperty(...); // Okay!!<br />
   oPerson.SomeProperty = oSomeProperty; // ** crash!!!  oPerson NOT NULL!!<br />
<br />
<br />
} catch(Exception ex)<br />
{<br />
  Console.WriteLine("Tell me everything..."); Exception? try-catch never caught it?!<br />
}<br />
<br />
class Person<br />
{<br />
   protected PersonProperty _SomeProperty = null;<br />
   ...<br />
   public PersonProperty SomeProperty<br />
   { <br />
       get { return _SomeProperty; }<br />
       set {<br />
         _SomeProperty = value; << Actually it crashed right here.<br />
       }<br />
   }<br />
   ...<br />
}<br />

no clue - even if it was a stackOverflowException Visual Studio will tell me. But this one, I step as close to problem as I could by tracking it down to SomeProperty setter in Person class. I can't go lower - I don't have .NET source code!

dev

modified on Wednesday, April 1, 2009 5:25 AM

Re: What exceptions cannot be caught by try-catch block?

moon_stick31-Mar-09 23:35

moon_stick

31-Mar-09 23:35

There was an article[^] posted in the lounge the other week converning problems with the Large Object Heap (LOH).

There is some sample code in there that catches out of memory exceptions and forces a GC.Collect(). I suspect that this might only work because the the LOH is unable to allocate more memory but there is still available memory in the small object heaps (SOH). I'd imagine that if you were to use all memory on the SOH's that you wouldn't be able to catch the exception, but there are definitely circumstances where the exception can be caught and handled appropriately.

It definitely isn't definatley

Re: What exceptions cannot be caught by try-catch block?

devvvy1-Apr-09 0:13

devvvy

1-Apr-09 0:13

hey appreciate it, let me take a look at this NOW! i've been tormented... this "SomeProperty" is actually a complex object graph but at the time when this failed (which happens every single time so it's not like it's sporadic or indeterministic) the graph is quite shallow/simple... alright let me clear my head and start reading!

dev

Re: What exceptions cannot be caught by try-catch block?

devvvy1-Apr-09 0:38

devvvy

1-Apr-09 0:38

oh... it's not LOH because at the time when it breaks the object graph still small - i.e. far less than 85,000 bytes (My guess is that it should be about 5000 bytes only, there's no easy way to determine size of complex graph of reference type... so...)

dev

Re: What exceptions cannot be caught by try-catch block?

devvvy1-Apr-09 3:14

devvvy

1-Apr-09 3:14

I've found it

some framework code called Person.ToString after setter set, which resulted in infinite recursion (parent->child->parent sort).

Thanks!

dev

Re: What exceptions cannot be caught by try-catch block?

0x3c01-Apr-09 0:06

0x3c0

1-Apr-09 0:06

Off the top of my head, the LoaderLock exception seem to slip through the net. But anything that's invoked by Environment.FailFast seems to do the trick

HELP ME!!

Reza S31-Mar-09 22:02

Reza S

31-Mar-09 22:02

class Node
{
int[] State = new int[2];
Node *[] Ptr;
}
how can i have a class like this please help me to use unsafe keyword for using this array of pointer and how can I declare my Ptr array cells?

Re: HELP ME!!

12Code31-Mar-09 22:14

12Code

31-Mar-09 22:14

unsafe class Node<br />
{<br />
    fixed (int* ptr = &array[10])<br />
}

8.Kelvin()
{   
  while (!(the machine can program itself))
     Wont_stop_coding = true;
}

how to create windows xp user using c# code

azad yadav31-Mar-09 21:46

azad yadav

31-Mar-09 21:46

Hi friend
How to create windows xp user using c# code
plz help me

Thanks and regards
Azad yadav

Re: how to create windows xp user using c# code

King Julien31-Mar-09 22:04

King Julien

31-Mar-09 22:04

Check the DirectoryEntry class and the objects Invoke method...

Have a Happy Coding.....

Re: how to create windows xp user using c# code

stancrm31-Mar-09 22:11

stancrm

31-Mar-09 22:11

Howto: (Almost) Everything In Active Directory via C#[^]

Import from CSV file to GridView

Logue31-Mar-09 21:45

Logue

31-Mar-09 21:45

Hello.
Problem: Need import from CSV file information in the GridView.
File Format:
"MachineName", "Hostname", "IP Address" (to a new line)
"Machine", "MachineHost", "127.0.0.1" (to a new line)
"Machine2", "MachineHost2", "127.0.0.1"
And respectively insert into GridView, with fields : MachineName, Hostname, IP Address.
Thanks.

Re: Import from CSV file to GridView

musefan31-Mar-09 21:49

musefan

31-Mar-09 21:49

read the file line by line...
split each line...
enter each value into a gridview column...

end

Life goes very fast. Tomorrow, today is already yesterday.

Building Link List

Reza S31-Mar-09 21:43

Reza S

31-Mar-09 21:43

can you explain a way that I can use a pointer member in my class in c#?
sample:
class test
{
int Number;
test *[] Ptr;
}

Re: Building Link List

musefan31-Mar-09 21:51

musefan

31-Mar-09 21:51

I think you just need to use the 'ref' (reference) keyword...

class test
{
int Number;
test ref Ptr;
}

Life goes very fast. Tomorrow, today is already yesterday.

Re: Building Link List

12Code31-Mar-09 22:06

12Code

31-Mar-09 22:06

C# does not support pointer arithmetic. use unsafe keyword.

unsafe class test
{
int Number;
test *[] Ptr;
}

8.Kelvin()
{   
  while (!(the machine can program itself))
     Wont_stop_coding = true;
}

c# with a WPF GUI

josephchild31-Mar-09 21:33

josephchild

31-Mar-09 21:33

Ok, My appologies if this is in the wrong section. I couldnt tell if it was a problem with sql server, or my code.

Im building a small app that grabs some data out of my sql server express 2005 database, and tosses it into a dropdown list. Simple enough.

I decided to go with a WPF gui, so I could drop it onto my web server and view it via IE.

My app works great on every box I try it on, on the local network (after getting all the certificate validation done). However, when I try to access it from a computer from outside the network, it runs into a bunch of sql server exceptions. My web server and sql server are running on the same machine.

I dont know if its the connection string failing from an outside network, or maybe I just dont understand how its trying to access the sql server. Here is the connection string I use to establish the connection.

SqlConnection con = new SqlConnection(string.Format(@"Data Source=MyComputerName\SQLEXPRESS;Initial Catalog=MYDB;User Id=me;Password=mypw;"));

When I connect to my .xbap file on the webserver from outside the network, I get 'An error occurred in the application you were using' and the following error in the 'More Information'

--The Error is quite verbose, so i tried to only include a portion of it--

System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.Data.SqlClient.SqlException: A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)

at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection)
at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj)
at System.Data.SqlClient.TdsParser.Connect(ServerInfo serverInfo, SqlInternalConnectionTds connHandler, Boolean ignoreSniOpenTimeout, Int64 timerExpire, Boolean encrypt, Boolean trustServerCert, Boolean integratedSecurity, SqlConnection owningObject)
at System.Data.SqlClient.SqlInternalConnectionTds.AttemptOneLogin(ServerInfo serverInfo, String newPassword, Boolean ignoreSniOpenTimeout, Int64 timerExpire, SqlConnection owningObject)
at System.Data.SqlClient.SqlInternalConnectionTds.LoginNoFailover(String host, String newPassword, Boolean redirectedUserInstance, SqlConnection owningObject, SqlConnectionString connectionOptions, Int64 timerStart)

If more information would be useful, let me know.

Re: c# with a WPF GUI

Eddy Vluggen31-Mar-09 21:57

Eddy Vluggen

31-Mar-09 21:57

josephchild wrote:
and that SQL Server is configured to allow remote connections.

By default, SQL Express will refuse any connections that are made to the database that originate from outside of that computer. That setting can be changed, off course. Read about it here[^].

I are troll Smile | :)

Re: c# with a WPF GUI

josephchild31-Mar-09 23:20

josephchild

31-Mar-09 23:20

the article you mention says:

Enable remote connections on the instance of SQL Server that you want to connect to from a remote computer.
** In the sql server 2005 Surface area configuration: I have my settings set to 'Local and remote connections' with 'Using both TCP/IP and named pipes'

Turn on the SQL Server Browser service.
** In the sql server 2005 Surface area configuration: I have the SQL Browser service running, and startup type set to Automatic

Configure the firewall to allow network traffic that is related to SQL Server and to the SQL Server Browser service.
** I have no firewall enabled. I even made sure port 1433 is being forwarded to my server. I also tried setting the computer up as the DMZ.

Do you have any more suggestions? I really appreciate your help in this.
I am able to connect and run my app from other computers on my network. I just am unable to connect and run the app from outside the network.

Re: c# with a WPF GUI

Eddy Vluggen31-Mar-09 23:49

Eddy Vluggen

31-Mar-09 23:49

Sounds like your settings are correct and that there's something on your network that's preventing the connection. Have you tried from a different network? At that point I usually try to find a good network-admin to help me Blush | :O

I are troll Smile | :)

Re: c# with a WPF GUI

josephchild1-Apr-09 7:37

josephchild

1-Apr-09 7:37

unforturnately I dont think I'll be able to try from another network. I cant think of anything preventing the connection. My web server Im using is Apache/2.0.55 win32 .. I cant think of any reason it would be apache keeping this from working. From what I understand, it seems that the app is having a problem hitting the sql server, and that I might have some setting wrong. If you or anyone else has any ideas, I would be happy to hear them.

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