TypeInitializationException Confusion

This is a discussion on TypeInitializationException Confusion within the C# Programming forums, part of the General Programming Boards category; I have a question because the results are driving me insane.... I have a .NET C# application VS 2005 .NET ...

  1. #1
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    Angry TypeInitializationException Confusion

    I have a question because the results are driving me insane....

    I have a .NET C# application VS 2005 .NET 2.0, I wrote a very simple console application, that from the main method or function it calls a worker threads and inside the worker threads each thread declares a sql connection and opens and runs sql transactions.

    The code on one computer compiles but when runs and jumps into the worker thread throws a TypeInitializationException error when initializing the sql connection:

    Code:
    SqlConnection conn = new SQLConnection(connstring);
    6 hours of research and I don't know how many different attempts to alter the code, I finally take the original code the problem started with and copy it to another computer with same compiler and versions of .NET and it works fine.....

    Two versions in case anyone can help me understand this....

    error code:
    Code:
     static void Main(string[] args)
            {
    //start batch monitor thread
                Thread t = new Thread(new ThreadStart(monitor_BatchPrint));
                t.IsBackground = true;
                t.Start();
    
                Console.Write("have already called worker thread");
                System.Threading.Thread.Sleep(30000);
    
            }
    
            private static void monitor_BatchPrint ()
            {
                //open db connection
                string connstring;
                connstring = "server=.\\SQLEXPRESS" + ";integrated security=SSPI;" + "database=FXGDB";
                SqlConnection conn = new SqlConnection(conn);
                Console.Write("/n !!!!!!inside first call we are doing good here");
    }
    working code
    Code:
    static void Main(string[] args)
            {
                Console.Write("Hello processing thread");
                Thread worker = new Thread(new ThreadStart(sql_thread));
                worker.IsBackground = true;
                worker.Start();
                System.Threading.Thread.Sleep(20000);
                worker.Abort();
    
            }
            public static void sql_thread()
            {
            /*    //declare connection string storage variable for sql connection
                string connstring;
                //create connection string with server and db information
                connstring = "server=.\\SQLEXPRESS" + ";integrated security=SSPI;" + "database=FXGDB";
                SqlConnection conn = new SqlConnection(connstring);
                conn.Open();
                Console.Write("db open");
                System.Threading.Thread.Sleep(5000);
                conn.Close(); */
                //open db connection
                string connstring;
                connstring = "server=.\\SQLEXPRESS" + ";integrated security=SSPI;" + "database=FXGDB";
                SqlConnection connection = new SqlConnection(connstring);
                Console.Write("/n !!!!!!inside first call we are doing good here");
                Process pBatchPrt = null;
    
            }

  2. #2
    and the hat of wrongness Salem's Avatar
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  3. #3
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    type initialization exceptions occur when there's an error initializing a class BEFORE execution of the Main() method. as far as i can tell the 2 versions are pretty much the same. your problem is probably elsewhere. check for any static instances you have defined.

    or u can do it the quick and lazy way and go to debug -> exceptions -> and turn on break into debugger for all uncaught exceptions. run the program and it'll break at the line that causes the exception.

    btw, don't use thread.Abort(). it's evil. use a bool flag instead.
    Last edited by bling; 09-20-2008 at 11:38 AM.

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