The type initializer for MyClass threw an exception

Question

The following is my Windows service code  When I am debugging the code  I am getting the error  exception      The type initializer for  CSMessageUtility CSDetails  threw an exception    using System  using System Collections Generic  using System ComponentModel  using System Data  using System Diagnostics  using System Linq  using System ServiceProcess  using System Text  using System IO  using System Threading  using System Windows  using System Windows Forms  using CSMessageUtility   namespace CS Data Trasmmiting Service       public partial class svcCSWinServ   ServiceBase                 private string sLogFormat            private string sErrorTime          private Thread new thread          Logger logObject   new Logger            private bool isenable   true           public svcCSWinServ                         InitializeComponent                logObject append  Initialize Service     DateTime Now ToString    70               CheckForAlarms                       protected override void OnStart string   args                        try                               new thread   new Thread new ThreadStart CheckForAlarms                    new thread Start                              catch                                          logObject append  Service Started successfully     DateTime Now ToString    70                      protected override void OnStop                         try                               isenable   false                  new thread Abort                              catch                                          logObject append  Service Stopped successfully     DateTime Now ToString    70                       void CheckForAlarms                         try                               while  true                                          if  DateTime Now ToString  HH mm       18 00                                                     logObject append  Start Sending Data    DateTime Now ToString    70                           try                                                         SendAllInfo                                string str   CSMessageUtility CSDetails createDHSMessageFormat                                Thread Sleep 2000                               string str1   CSMessageUtility CSDetails createEALMessageFormat                                Thread Sleep 2000                               string str2   CSMessageUtility CSDetails createProductStatusMessageForamt                                Thread Sleep 2000                               string str3   CSMessageUtility CSDetails createEODMessageFormat                                Thread Sleep 2000                               string str4   CSDetails createProductReceiptEntryatBOSMessageFormat                                Thread Sleep 2000                               string str5   CSMessageUtility CSDetails createProductSaleMessageFormat                                Thread Sleep 2000                               string str6   CSMessageUtility CSDetails createTotalizerExceptionMessageFormat                                Thread Sleep 2000                                 CSMessageUtility CSDetails createDailyCOtransferMessageFormat                                  Thread Sleep 2000                                                      catch  Exception ee                                                        logObject append ee Message  70                                                     logObject append  Finished Sending Data    DateTime Now ToString    70                           Thread Sleep 3000                                                 Thread Sleep 20000                                               catch  Exception ex                                logObject append  Thread Exception     ex Message        DateTime Now ToString    70                    try                                       new thread Abort                                      catch  Exception ex1                                        logObject append  Thread Exception     ex1 Message         DateTime Now ToString    70                                      if  isenable    true                                        new thread   new Thread new ThreadStart CheckForAlarms                        new thread Start

User · Answer

I wrapped my line that was crashing in a try-catch block, printed out the exception, and breaked immediately after it was printed. The exception information shown had a stack trace which pointed me to the file and line of code causing the fault to occur.

System.TypeInitializationException: The type initializer for 'Blah.blah.blah' threw an exception. 
---> System.NullReferenceException: Object reference not set to an instance of an object.
   at Some.Faulty.Software..cctor() in C:\Projects\My.Faulty.File.cs:line 56
   --- End of inner exception stack trace ---
   at Blah.blah.blah(Blah.blah.blah)
   at TestApplication.Program.Main(String[] args) 
   in C:\Projects\Blah.blah.blah\Program.cs:line 29 Exception caught.

User · Answer

I too faced this error in two situation    While performing redirection from BAL layer to DAL layer I faced this exception  Inner exception says that  Object Reference error   Web Config file key does not match    Hope this useful to solve your problem

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Check the InnerException property of the TypeInitializationException  it is likely to contain information about the underlying problem  and exactly where it occurred

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My Answer is also related to Config section  If you assign values from Config file at static class of C  or Module VB of VB  you will get this error at run time   add key  LogPath  value    Error Log    Using Forward slash in Web Config also leads to this error on Run time  I just resolved this issue by putting BackSlash  add key  LogPath  value    Error Log

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Noteworthy  I had multiple projects in my solution and I forgot to add the references Nuget libraries  When I ran a method in the static class  which used the given libraries  it threw the exception mentioned

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Had a case like this in a WPF project   My issue was on a line that went like this   DataTable myTable   FillTable strMySqlQuery     Where FillTable   returned a DataTable based on a SQL query string   If I did the  copy exception to clipboard  option  I think it was  and pasted into Notepad  I could see the message   For me  it was The input is not a valid Base-64 string as it contains a non-base 64 character     My actual problem wasn t that the query string had something that shouldn t be there  like I was thinking  because string strMySqlQuery    SELECT   FROM My Table  was my string and thought it could be the   or    but the actual problem was in FillTable    where I had a call to another function  GetConnection   that returned an OracleConnection object  in order to open it and retrieve and return the DataTable   Inside GetConnection   I was getting the app config parameters for my connection string  and I had one of them misnamed  so it was setting a null value for the service account s password and not making the DB connection   So it s not always where the error is exactly correct for all circumstances   Best to dive into the function where the error is and debug step-by-step and ensure all values are getting filled with what you expect

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This can happen if you have a dependency property that is registered to the wrong owner type  ownerType argument   Notice SomeOtherControl should have been YourControl  public partial class YourControl       public bool Enabled               get   return  bool GetValue EnabledProperty               set   SetValue EnabledProperty  value               public static readonly DependencyProperty EnabledProperty           DependencyProperty Register nameof Enabled   typeof bool   typeof SomeOtherControl   new PropertyMetadata false

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The type initializer for  CSMessageUtility CSDetails  threw an exception  means that the static constructor on that class threw an Exception - so you need to look either in the static constructor of the CSDetails class  or in the initialisation of any static members of that class

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Similar to what Muhammad Iqbal stated   I was in a VB NET  may also be C   project where I did remove a key-value pair from the App config which was referenced by a variable global to the Sub Main   of Module Main   Therefore  the exception  and break  occurs in Module Main before the Sub Main     If only I had a break-point on the Dim  but we don t usually break on global variables   Perhaps a good reason not to declare globals referencing App config   In other words  this        An unhandled exception of type  System TypeInitializationException  occurred in Unknown Module    The type initializer for  Namespace Main  threw an exception    Is caused by     App config   lt connectionStrings gt       lt  -- lt add name  ConnectionString1  connectionString         gt -- gt    Main module  Module Main     Dim cnnString As String   ConfigurationManager ConnectionStrings  ConnectionString1      lt -- BREAK HERE  EXCEPTION       Sub Main               main code      End Main End Module

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Somehow exiting Visual Studio and re-opening it solved this for me

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If for whatever reason the power goes or the Visual Studio IDE crashes it can cause this problem inside your bin debug bin release     Just delete the content and recompile  from personal experience when my toe hit the reset button

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I ran into the same problem  when I was using a static methods in a Util class  just like you had used CSMessageUtility CSDetails  The problem was that during the static initialization of the class  using the static constructor   the framework also initialize the the static variables  fields  in the class  I had a static variable that attempts to read values from app config  and app config was missing the respective settings  thus resulting in an un-handled exception  This resulted in getting the   quot Object reference not set to an instance of an object  quot   as the inner exception

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Dictionary keys should be unique    In my case  I was using a Dictionary  and I found two items in it have accidentally the same key   Dictionary lt string  string gt  myDictionary   new Dictionary lt string  string gt                    KEY1    V1                  KEY1    V2                   KEY3    V3

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One other thing to check when these initialize errors are thrown would be to check if the target  NET version is installed on the server  You can right click the project and see what  NET version the application is targeting

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I encountered this issue 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

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Another scenario that might cause this is when you have a piece of your code that calls   string sParam     ConfigurationManager AppSettings  SOME PARAM   ToString      Keep in mind that you have to use the OWSTIMER EXE CONFIG file for configuration file settings  I had an App config file that I was trying to read and I was getting this error because on instantiation of my job instance  I had a line in my code that was referring to Connfiguration AppSettings  amp  Configuration ConnectionStrings  Just make sure that you go the path    C  Program Files Common Files Microsoft Shared Web Server Extensions 14 BIN   and place your configuration settings in the OWSTIMER EXE CONFIG file

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In my case I had this failing on Logger Create inside a class library that was being used by my main  console  app  The problem was I had forgotten to add a reference to NLog dll in my console app  Adding the reference with the correct  NET Framework library version fixed the problem

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As the Error says the initialization of the Type Class failed  This usually occurs when there is some exception in the constructor of the class  Most common reason is you assign some value in the constructor reading from a config file and the config file is missing those values

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In my case  I had a helper class that was static  In that class was a method to initialize a SqlCommand dependent on variables  As this was being called in several places I moved it to the helper class and called as needed  so this method was also static  Now I had a global property that was the connection string in Global asax pointing to the connection string in web config  Intermittently I would get  The type initializer for  Helper  threw an exception   If I moved the method from the Helper class to the class where it was being called from all was good  The inner exception complained of the object being null  Helper class   What I did was add Using Helper to Global asax and even though it was not being used by Global asax this solved the problem

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This problem can be caused if a class tries to get value of a key in web config or app config which is not present there   e g   The class has a static variable   private static string ClientID   System Configuration ConfigurationSettings AppSettings  GoogleCalendarApplicationClientID   ToString      But the web config doesn t contain the GoogleCalendarApplicationClientID key  The error will be thrown on any static function call or any class instance creation

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I had a different but still related configuration   Could be a custom configuration section that hasn t been declared in configSections   Just declare the section and the error should resolve itself

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I ve had the same problem caused by having two of the same configuration properties  which matches the app config    ConfigurationProperty  quot TransferTimeValidity quot

[c#] The type initializer for 'MyClass' threw an exception

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