What is and how to fix System TypeInitializationException error

Question

private static void Main string   args        string str   null      Logger InitUserLogWithRotation                   lt --- error occur             When I build project  it has no error  But When I execute it  it always aborted   I tried to debug project   but System TypeInitializationException error occurred at first line   I ve already tried to googling   yet found no solution   It seems like any variable initialize code is wrong   but can t find it   Please help me  I m new to C    Thanks      Here is Logger Class Code  public class Logger       private static int HDLOG PRIORITY DEBUG   4      private static int HDLOG PRIORITY ERROR   1      private static int HDLOG PRIORITY FATAL   0      private static int HDLOG PRIORITY INFO   3      private static int HDLOG PRIORITY WARNING   2      public static int LOG LEVEL DEBUG   4      public static int LOG LEVEL ERROR   2      public static int LOG LEVEL FATAL   1      public static int LOG LEVEL INFO   5      public static int LOG LEVEL WARNING   3      private static string s bstCommonAppData   Path Combine s commonAppData   XXXX        private static string s bstUserDataDir   Path Combine s bstCommonAppData   UserData        private static string s commonAppData   Environment GetFolderPath Environment SpecialFolder CommonApplicationData       private static bool s consoleLogging   false      private static FileStream s fileStream      public static HdLoggerCallback s HdLoggerCallback      private static string s logDir   null      private static string s logFileName    XXXX       private static string s logFilePath   null      public static int s logFileSize   0xa00000      private static bool s loggerInited   false      private static string s logLevels   null      private static int s logRotationTime   0x7530      private static string s logStringDebug    DEBUG       private static string s logStringError    ERROR       private static string s logStringFatal    FATAL       private static string s logStringInfo    INFO       private static string s logStringWarning    WARNING       private static int s processId   -1      private static string s processName    Unknown       private static object s sync   new object        public static int s totalLogFileNum   5      private static TextWriter writer   Console Error       private static void Close                 if   s consoleLogging                        writer Close                s fileStream Dispose                writer Dispose                         public static void Debug string msg                Debug   0    new object     msg                public static void Debug string fmt  params object   args                Print LOG LEVEL DEBUG  s processName  fmt  args              private static void DoLogRotation             Label 0000          Thread Sleep s logRotationTime           try                       lock  s sync                                FileInfo info   new FileInfo s logFilePath                   if  info Length  gt   s logFileSize                                        string destFileName   s logFilePath     1                       string path   s logFilePath         s totalLogFileNum                      if  File Exists path                                                 File Delete path                                             for  int i   s totalLogFileNum - 1  i  gt   1  i--                                                string str3   s logFilePath         i                          string str4   s logFilePath          i   1                           if  File Exists str3                                                         File Move str3  str4                                                                       File Move s logFilePath  destFileName                                               goto Label 0000                    catch  Exception                        goto Label 0000                       public static void Error string msg                Error   0    new object     msg                public static void Error string fmt  params object   args                Print LOG LEVEL ERROR  s processName  fmt  args              public static void Fatal string msg                Fatal   0    new object     msg                public static void Fatal string fmt  params object   args                Print LOG LEVEL FATAL  s processName  fmt  args              private static string GetLogDir bool userSpecificLog                string str          if  s logDir    null                        return s logDir                    try                       if  userSpecificLog                                str   Path Combine s bstUserDataDir   Logs                              else                               str    string  Registry LocalMachine OpenSubKey   Software XXXX   GetValue  LogDir                                    catch  Exception                        str   Path Combine s bstUserDataDir   Logs                      s logDir   str          return str             private static string GetPrefix string tag  string logLevel                int managedThreadId   Thread CurrentThread ManagedThreadId          DateTime now   DateTime Now          return string Format   0 D4 - 1 D2 - 2 D2   3 D2   4 D2   5 D2   6 D3   7   8 X8    9     10      new object     now Year  now Month  now Day  now Hour  now Minute  now Second  now Millisecond  s processId  managedThreadId  tag  logLevel                public static TextWriter GetWriter                 return new Writer delegate  string msg                Print msg                          private static void HdLogger int prio  uint tid  string tag  string msg                int level   0          if  prio    HDLOG PRIORITY FATAL                        level   LOG LEVEL FATAL                    else if  prio    HDLOG PRIORITY ERROR                        level   LOG LEVEL ERROR                    else if  prio    HDLOG PRIORITY WARNING                        level   LOG LEVEL WARNING                    else if  prio    HDLOG PRIORITY INFO                        level   LOG LEVEL INFO                    else if  prio    HDLOG PRIORITY DEBUG                        level   LOG LEVEL DEBUG                    Print level  tag    0 X8    1    new object     tid  msg                public static void Info string msg                Info   0    new object     msg                public static void Info string fmt  params object   args                Print LOG LEVEL INFO  s processName  fmt  args              public static void InitConsoleLog                 InitLog  -   true  false              public static void InitLog string logFileName  bool userSpecificLog  bool doLogRotation                s loggerInited   true          s HdLoggerCallback   new HdLoggerCallback Logger HdLogger           s processId   Process GetCurrentProcess   Id          s processName   Process GetCurrentProcess   ProcessName          if  logFileName     -                         writer   Console Error              s consoleLogging   true                    else                       if  logFileName    null                                logFileName   s logFileName                            if  userSpecificLog                                logFileName   logFileName    Users                             string logDir   GetLogDir userSpecificLog               string str2   string Format    0   1  log   logDir  logFileName               if   Directory Exists logDir                                 Directory CreateDirectory logDir                             s logFilePath   str2              LogLevelsInit                lock  s sync                                Open                              if  doLogRotation                                new Thread      gt  DoLogRotation      IsBackground   true   Start                                       public static void InitSystemLog                 InitLog null  false  false              public static void InitSystemLogWithRotation                 InitLog null  false  true              public static void InitUserLog                 InitLog null  true  false              public static void InitUserLogWithRotation                 InitLog null  true  true              private static bool IsLogLevelEnabled string tag  string level                if  s logLevels    null                        return false                    return  s logLevels StartsWith  ALL      s logLevels Contains  tag         level  ToUpper                 private static void LogLevelsInit                 string name     Software XXXX Config           try                       using  RegistryKey key   Registry LocalMachine OpenSubKey name                                 s logLevels    string  key GetValue  DebugLogs                                    catch  Exception                        return                    if  s logLevels    null                        s logLevels   s logLevels ToUpper                         private static void Open                 if   s consoleLogging                        if   s loggerInited                                InitLog  -   false  false                   s loggerInited   true                            else                               s fileStream   new FileStream s logFilePath  FileMode Append  FileAccess Write  FileShare Delete   FileShare ReadWrite                   writer   new StreamWriter s fileStream  Encoding UTF8                                      public static void Print string msg                Print   0    new object     msg                public static void Print string fmt  params object   args                Print LOG LEVEL INFO  s processName  fmt  args              public static void Print int level  string tag  string fmt  params object   args                string str    UNKNOWN           if  level    LOG LEVEL FATAL                        str   s logStringFatal                    else if  level    LOG LEVEL ERROR                        str   s logStringError                    else if  level    LOG LEVEL WARNING                        str   s logStringWarning                    else if  level    LOG LEVEL INFO                        str   s logStringInfo                    else if  level    LOG LEVEL DEBUG                        str   s logStringDebug                    if   level    LOG LEVEL DEBUG     IsLogLevelEnabled tag  str                         lock  s sync                                Open                    writer WriteLine GetPrefix tag  str    fmt  args                   writer Flush                    Close                                       public static void SetLogDir string logDir                s logDir   logDir             public static void Warning string msg                Warning   0    new object     msg                public static void Warning string fmt  params object   args                Print LOG LEVEL WARNING  s processName  fmt  args              public delegate void HdLoggerCallback int prio  uint tid  string tag  string msg        public class Writer   TextWriter               private WriteFunc writeFunc           public Writer WriteFunc writeFunc                        this writeFunc   writeFunc                     public override void WriteLine string msg                        this writeFunc msg                      public override void WriteLine string fmt  object obj                        this writeFunc string Format fmt  obj                       public override void WriteLine string fmt  object   objs                        this writeFunc string Format fmt  objs                       public override System Text Encoding Encoding                       get                               return System Text Encoding UTF8                                   public delegate void WriteFunc string msg

User · Accepted Answer

Whenever a TypeInitializationException is thrown  check all initialization logic of the type you are referring to for the first time in the statement where the exception is thrown - in your case  Logger   Initialization logic includes  the type s static constructor  which - if I didn t miss it - you do not have for Logger  and field initialization   Field initialization is pretty much  uncritical  in Logger except for the following lines   private static string s bstCommonAppData   Path Combine s commonAppData   XXXX    private static string s bstUserDataDir   Path Combine s bstCommonAppData   UserData    private static string s commonAppData   Environment GetFolderPath Environment SpecialFolder CommonApplicationData     s commonAppData is null at the point where Path Combine s commonAppData   XXXX    is called  As far as I m concerned  these initializations happen in the exact order you wrote them - so put s commonAppData up by at least two lines

User · Answer

Had a simular issue getting the same exception  Took some time locating  In my case I had a static utility class with a constructor that threw the exception  wrapping it   So my issue was in the static constructor

User · Answer

I had this problem  As stated it is probably a static declaration issue  In my case it was because I had a static within a DEBUG clause  That is  in c     if DEBUG     public static bool DOTHISISINDEBUGONLY   false   endif   Everything worked fine until I complied a Release version of the code and after that I got this error - even on old release versions of the code  Once I took the variable out of the DEBUG clause everything returned to normal

User · Answer

I have the error of system typeintialzationException  which is due to when I tried to move the file like    File Move DestinationFilePath  SourceFilePath    That error was due to I had swapped the path actually  correct one is    File Move SourceFilePath  DestinationFilePath

User · Answer

I experienced the System TypeInitializationException due to a different error in my  NET framework 4 project s app config   Thank you to pStan for getting me to look at the app config   My configSections were properly defined   However  an undefined element within one of the sections caused the exception to be thrown   Bottom line is that problems in the app config can generated this very misleading TypeInitializationException   A more meaningful ConfigurationErrorsException can be generated by the same error in the app config by waiting to access the config values until you are within a method rather than at the class level of the code   using System  using System Collections Generic  using System Linq  using System Text  using System Configuration  using System Collections Specialized   namespace ConfigTest       class Program               public static string machinename          public static string hostname          public static NameValueCollection  AppSettings           static void Main string   args                        machinename   System Net Dns GetHostName   ToLower                hostname    abc com     System Net Dns GetHostEntry System Net Dns GetHostName    HostName ToLower   Replace machinename                          AppSettings   ConfigurationManager GetSection  domain     hostname  as System Collections Specialized NameValueCollection

User · Answer

The TypeInitializationException that is thrown as a wrapper around the exception thrown by the class initializer  This class cannot be inherited   TypeInitializationException is also called static constructors

User · Answer

System TypeInitializationException happens when the code that gets executed during the process of loading the type throws an exception   When  NET loads the type  it must prepare all its static fields before the first time that you use the type  Sometimes  initialization requires running code  It is when that code fails that you get a System TypeInitializationException   In your specific case  the following three static fields run some code   private static string s bstCommonAppData   Path Combine s commonAppData   XXXX    private static string s bstUserDataDir   Path Combine s bstCommonAppData   UserData    private static string s commonAppData   Environment GetFolderPath Environment SpecialFolder CommonApplicationData     Note that s bstCommonAppData depends on s commonAppData  but it is declared ahead of its dependency  Therefore  the value of s commonAppData is null at the time that the Path Combine is called  resulting in ArgumentNullException  Same goes for the s bstUserDataDir and s bstCommonAppData  they are declared in reverse order to the desired order of initialization   Re-order the lines to fix this problem   private static string s commonAppData   Environment GetFolderPath Environment SpecialFolder CommonApplicationData   private static string s bstCommonAppData   Path Combine s commonAppData   XXXX    private static string s bstUserDataDir   Path Combine s bstCommonAppData   UserData

User · Answer

I know that this is a bit of an old question  but I had this error recently so I thought I would pass my solution along    My errors seem to stem from a old App Config file and the  in place  upgrade from  Net 4 0 to  Net 4 5 1     When I started the older project up after upgrading to Framework 4 5 1 I got the TypeInitializationException    right off the bat    not even able to step through one line of code     After creating a brand new wpf project to test  I found that the newer App Config file wants the following      lt configSections gt       lt sectionGroup name  userSettings  type  System Configuration UserSettingsGroup  System  Version 4 0 0 0  Culture neutral  PublicKeyToken b77a5c561934e089   gt         lt section name  YourAppName Properties Settings  type  System Configuration ClientSettingsSection  System  Version 4 0 0 0  Culture neutral  PublicKeyToken b77a5c561934e089  allowExeDefinition  MachineToLocalUser  requirePermission  false    gt       lt  sectionGroup gt     lt  configSections gt      Once I dropped that in  I was in business     Note that your need might be slightly different   I would create a dummy project  check out the generated App Config file and see if you have anything else missing    Hope this helps someone   Happy Coding

User · Answer

i  Please check the InnerException property of the TypeInitializationException  ii  Also  this may occur due to mismatch between the runtime versions of the assemblies  Please verify the runtime versions of the main assembly  calling application  and the referred assembly

User · Answer

If you have custom attributes in appsetting  move your          lt configSections gt         lt  configSections gt    tag to the first child in the  lt confuguration gt

User · Answer

These lines are your problem  or at least one of your problems  if there are more    private static string s bstCommonAppData   Path Combine s commonAppData   XXXX    private static string s bstUserDataDir   Path Combine s bstCommonAppData   UserData    private static string s commonAppData   Environment GetFolderPath Environment SpecialFolder CommonApplicationData     You reference some static members in the initializers for other static members   This is a bad idea  as the compiler doesn t know in which order to initialize them   The result is that during the initialization of s bstCommonAppData  the dependent field s commonAppData has not yet been initialized  so you are calling Path Combine null   XXXX   and this method does not accept null arguments   You can fix this by making sure that fields used in the initialization of other fields are declared first   private static string s commonAppData   Environment GetFolderPath Environment SpecialFolder CommonApplicationData   private static string s bstCommonAppData   Path Combine s commonAppData   XXXX    private static string s bstUserDataDir   Path Combine s bstCommonAppData   UserData      Or use a static constructor to explicitly order the assignments   private static string s bstCommonAppData  private static string s bstUserDataDir  private static string s commonAppData   static Logger         s commonAppData   Environment GetFolderPath Environment SpecialFolder CommonApplicationData       s bstCommonAppData   Path Combine s commonAppData   XXXX        s bstUserDataDir   Path Combine s bstCommonAppData   UserData

[c#] What is and how to fix System.TypeInitializationException error?

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