打开字符串 Unicode 编码时出现错误

所以，我正在制作一个从西班牙语词典中读取的程序。它抓住一个随机的单词。我需要为字符串打开 Unicode，因为会有像"é"这样的字符，这显然需要对字符串进行不同的编码。当我为string[]打开 Unicode 时，它会给我以下错误消息：

    System.Windows.Markup.XamlParseException was unhandled
  Message='The invocation of the constructor on type 'WordADay.MainWindow' that matches the specified binding constraints threw an exception.' Line number '4' and line position '9'.
  Source=PresentationFramework
  LineNumber=4
  LinePosition=9
  StackTrace:
       at System.Windows.Markup.XamlReader.RewrapException(Exception e, IXamlLineInfo lineInfo, Uri baseUri)
       at System.Windows.Markup.WpfXamlLoader.Load(XamlReader xamlReader, IXamlObjectWriterFactory writerFactory, Boolean skipJournaledProperties, Object rootObject, XamlObjectWriterSettings settings, Uri baseUri)
       at System.Windows.Markup.WpfXamlLoader.LoadBaml(XamlReader xamlReader, Boolean skipJournaledProperties, Object rootObject, XamlAccessLevel accessLevel, Uri baseUri)
       at System.Windows.Markup.XamlReader.LoadBaml(Stream stream, ParserContext parserContext, Object parent, Boolean closeStream)
       at System.Windows.Application.LoadBamlStreamWithSyncInfo(Stream stream, ParserContext pc)
       at System.Windows.Application.LoadComponent(Uri resourceLocator, Boolean bSkipJournaledProperties)
       at System.Windows.Application.DoStartup()
       at System.Windows.Application.<.ctor>b__1(Object unused)
       at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
       at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)
       at System.Windows.Threading.DispatcherOperation.InvokeImpl()
       at System.Windows.Threading.DispatcherOperation.InvokeInSecurityContext(Object state)
       at System.Threading.ExecutionContext.runTryCode(Object userData)
       at System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(TryCode code, CleanupCode backoutCode, Object userData)
       at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       at System.Windows.Threading.DispatcherOperation.Invoke()
       at System.Windows.Threading.Dispatcher.ProcessQueue()
       at System.Windows.Threading.Dispatcher.WndProcHook(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
       at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
       at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
       at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
       at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)
       at System.Windows.Threading.Dispatcher.InvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs)
       at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)
       at MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg)
       at System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame)
       at System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame)
       at System.Windows.Threading.Dispatcher.Run()
       at System.Windows.Application.RunDispatcher(Object ignore)
       at System.Windows.Application.RunInternal(Window window)
       at System.Windows.Application.Run(Window window)
       at System.Windows.Application.Run()
       at WordADay.App.Main() in C:'Documents and Settings'admin'My Documents'WordADay'WordADay'obj'x86'Debug'App.g.cs:line 0
       at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
       at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
       at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
       at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       at System.Threading.ThreadHelper.ThreadStart()
  InnerException: System.IndexOutOfRangeException
       Message=Index was outside the bounds of the array.
       Source=WordADay
       StackTrace:
            at WordADay.MainWindow.newWord() in C:'Documents and Settings'admin'My Documents'WordADay'WordADay'MainWindow.xaml.cs:line 132
            at WordADay.MainWindow..ctor() in C:'Documents and Settings'admin'My Documents'WordADay'WordADay'MainWindow.xaml.cs:line 33
       InnerException: 

顺便说一句，这对我来说完全是古怪的，我无法理解。只是问，当来自此代码时这意味着什么？

        #region Setup
        Random word = new Random();
        string[] lines = File.ReadAllLines(dictionarypath, Encoding.Unicode);
        int randomword = word.Next(1, lines.Count());
        string[] excludedlines;
        if (!File.Exists(path))
        {
            File.Create(path);
        }
        excludedlines = File.ReadAllLines(path);
        string chosenWord = lines[randomword];
        #endregion
        #region Logic
        if (excludedlines.Count() == 58110)
        {
            File.WriteAllText(path, "");
        }
        if (excludedlines.Contains(chosenWord))
        {
            while (excludedlines.Contains(chosenWord))
            {
                randomword = word.Next(58110);
                chosenWord = lines[randomword];
            }
            File.AppendAllText(path, chosenWord + Environment.NewLine);
            excludedlines = File.ReadAllLines(path);
            label1.Content = chosenWord;
        }
        else
        {
            File.AppendAllText(path, chosenWord + Environment.NewLine);
            excludedlines = File.ReadAllLines(path);
            label1.Content = chosenWord;
        }
        #endregion