类型初始值设定项引发了异常

Question

我正在使用SQL Server CE编写C＃应用程序。 Evrtting工作正常，以至于我得到了这个异常：“ 'VideoStoreManager.AppData.DataBaseManager'的类型初始化程序引发了异常。 ”这行代码：DataBaseManager.Connection.Open（）;

这是完整的例外：

System.TypeInitializationException was unhandled
  Message="The type initializer for 'VideoStoreManager.AppData.DataBaseManager' threw an exception."
  Source="VideoStoreManager"
  TypeName="VideoStoreManager.AppData.DataBaseManager"
  StackTrace:
   at VideoStoreManager.AppData.DataBaseManager.get_Connection()
   at VideoStoreManager.Security.SecurityManager.AuthenticateUser(String username, String password) in D:\Владиславко\Четвърти курс\Разпределени приложения\Video Store Manager\VideoStoreManager\Security\SecurityManager.cs:line 51
   at VideoStoreManager.GUI.Forms.frmLogin.btnLogin_Click(Object sender, EventArgs e) in D:\Владиславко\Четвърти курс\Разпределени приложения\Video Store Manager\VideoStoreManager\GUI\Forms\frmLogin.cs:line 40
   at System.Windows.Forms.Control.OnClick(EventArgs e)
   at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
   at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.ButtonBase.WndProc(Message& m)
   at System.Windows.Forms.Button.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
   at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
   at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32 reason, Int32 pvLoopData)
   at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
   at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
   at System.Windows.Forms.Form.ShowDialog(IWin32Window owner)
   at VideoStoreManager.Program.Main() in D:\Владиславко\Четвърти курс\Разпределени приложения\Video Store Manager\VideoStoreManager\Program.cs:line 26
   at System.AppDomain._nExecuteAssembly(Assembly assembly, String[] args)
   at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Threading.ThreadHelper.ThreadStart()
  InnerException: System.ArgumentException
   Message="Format of the initialization string does not conform to specification starting at index 0."
   Source="System.Data.SqlServerCe"
   StackTrace:
        at System.Data.SqlServerCe.ConStringUtil.GetKeyValuePair(Char[] connectionString, Int32 currentPosition, String& key, Char[] valuebuf, Int32& vallength, Boolean& isempty)
        at System.Data.SqlServerCe.ConStringUtil.ParseStringIntoHashtable(String conString, Hashtable values)
        at System.Data.SqlServerCe.ConStringUtil.ParseConnectionString(String& connectionString)
        at System.Data.SqlServerCe.SqlCeConnection.set_ConnectionString(String value)
        at VideoStoreManager.AppData.DataBaseManager..cctor() in D:\Владиславко\Четвърти курс\Разпределени приложения\Video Store Manager\VideoStoreManager\AppData\DataBaseManager.cs:line 28
   InnerException:

Answer 1

问题是您的连接字符串对SqlServerCe无效。 从内部异常：

"Format of the initialization string does not conform to specification starting at index 0."

Answer 2

检查此链接，这一直帮助我

http://www.connectionstrings.com/sql-server-2005-ce

和http://www.connectionstrings.com适用于所有类型的数据库连接

在这个网站上有类似的问题/答案检查他们是否有帮助

初始化字符串的格式不符合从索引0开始的规范

初始化字符串的格式不符合从索引0开始的规范。不确定这是什么？

有关MSDN连接字符串的更多详细信息，请访问http://msdn.microsoft.com/en-us/library/system.configuration.configurationmanager.connectionstrings.aspx