只加载一次自定义字典。Wpf拼写检查器

Question

下面是代码：

IList dictionaries = SpellCheck.GetCustomDictionaries(tb);
Uri uri = new Uri("Russian.lex", UriKind.Relative);
dictionaries.Add(uri);
tb.SpellCheck.IsEnabled = true;

问题是，我必须使用拼写检查创建多个文本框，而分配自定义字典的唯一方法是将Uri传递给TextBoxBase.CustomDictionaries.Add()。因此，每次设置SpellCheck.IsEnabled时，都会有3-5秒的延迟，在我看来，这是由于从硬盘加载文件造成的。最重要的是，似乎每一次字典被载入，它就会永远留在记忆中。

关于如何加载自定义字典一次和比重用它的任何提示？

Answer 1

在许多错误的开始之后，我想我已经成功了。

我反复思考，直到找到了定制字典的内部表示形式(ILexicon)。然后，我将这个ILexicon分配给每个新的文本内容。这些接口中没有一个是公共的，因此我冒着在未来版本甚至是服务包中被破坏的明显风险，但它适用于今天。这在.net 4.6中会中断并变得不必要，请参见下面的内容。

using System;
using System.Collections;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Runtime.InteropServices;
using System.Security;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
using Melville.Library.ReflectionHelpers;

namespace PhotoDoc.Wpf.Controls.FormControls
{
  public static class DynamicDictionaryLoader
  {
    private static string dictionaryLocation;
    public static string DictionaryLocation
    {
      get
      {
        if (dictionaryLocation == null)
        {
          var path = Path.GetDirectoryName(Assembly.GetExecutingAssembly().GetName().CodeBase);
          dictionaryLocation = Path.Combine(path, "UsMedicalEnglish.dic");
        }
        return dictionaryLocation;
      }
    }

    public static void AddDictionary(TextBoxBase targetControl)
    {
      try
      {
        InnerLoadDictionary(targetControl);
      }
      catch (UriFormatException)
      {
        // occasionaly occurrs in odd instalations.  You just don't get the medical dictionary
      }
      catch (ArgumentException)
      {
        // this is a rare bug that I think may be a race condition inside WPF.  I've only triggered it 2-3 times.
        // One time was when I had seven files open at once.  The other, ironically, was when activating the
        // default text for a field.  

        // In this rare error exception, you will just get all your medical words flagged as mispellings for that
        // textbox.  I won't know for a while if this worked, because I only saw the bug after months of daily use
        // of the program.
      }
    }

    private static object oldDictionary = null;
    private static object dictionaryLoaderLock = new Object();

    private static void InnerLoadDictionary(TextBoxBase targetControl)
    {
      var dictionary = SpellCheck.GetCustomDictionaries(targetControl);
      if (dictionary.Count < 1)
      {
          var speller = dictionary.GetProperty("Speller");
          var uriMap = speller.GetProperty("UriMap") as IDictionary;
          if (uriMap.Count > 0) return; // already initalized
          lock (dictionaryLoaderLock)
          {
            var dictionaryUri = new Uri(DictionaryLocation, UriKind.Absolute);
            if (oldDictionary == null)
            {
              dictionary.Add(dictionaryUri);
              oldDictionary = uriMap.Values.OfType<object>().FirstOrDefault();
            }
            else
            {
              if (!(bool) speller.Call("EnsureInitialized")) return;
              uriMap.Add(dictionaryUri, oldDictionary);
              GetContext(
                speller.GetField("_spellerInterop").
                  GetField("_textChunk") as ITextChunk).
                  AddLexicon(oldDictionary.GetProperty("Lexicon") as ILexicon);
              speller.Call("ResetErrors");
            }
          }
      }
    }

    private static ITextContext GetContext(ITextChunk chunk)
    {
      ITextContext ret = null;
      chunk.get_Context(out ret);
      return ret;
    }

    #region Com Imports
    [ComImport]
    [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    [Guid("549F997E-0EC3-43d4-B443-2BF8021010CF")]
    private interface ITextChunk
    {
      void stub_get_InputText();
      void stub_put_InputText();
      [SecurityCritical, SuppressUnmanagedCodeSecurity]
      void SetInputArray([In] IntPtr inputArray, Int32 size);
      void stub_RegisterEngine();
      void stub_UnregisterEngine();
      void stub_get_InputArray();
      void stub_get_InputArrayRange();
      void stub_put_InputArrayRange();
      void get_Count(out Int32 val);
      void get_Item(Int32 index, [MarshalAs(UnmanagedType.Interface)] out object val);
      void stub_get__NewEnum();
      [SecurityCritical]
      void get_Sentences([MarshalAs(UnmanagedType.Interface)] out object val);
      void stub_get_PropertyCount();
      void stub_get_Property();
      void stub_put_Property();
      [SecurityCritical, SuppressUnmanagedCodeSecurity]
      void get_Context([MarshalAs(UnmanagedType.Interface)] out ITextContext val);
      [SecurityCritical, SuppressUnmanagedCodeSecurity]
      void put_Context([MarshalAs(UnmanagedType.Interface)] ITextContext val);
      void stub_get_Locale();
      [SecurityCritical, SuppressUnmanagedCodeSecurity]
      void put_Locale(Int32 val);
      void stub_get_IsLocaleReliable();
      void stub_put_IsLocaleReliable();
      void stub_get_IsEndOfDocument();
      void stub_put_IsEndOfDocument();
      [SecurityCritical, SuppressUnmanagedCodeSecurity]
      void GetEnumerator([MarshalAs(UnmanagedType.Interface)] out object val);
      void stub_ToString();
      void stub_ProcessStream();
      void get_ReuseObjects(out bool val);
      [SecurityCritical, SuppressUnmanagedCodeSecurity]
      void put_ReuseObjects(bool val);
    }

    [ComImport]
    [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    [Guid("B6797CC0-11AE-4047-A438-26C0C916EB8D")]
    private interface ITextContext
    {
      void stub_get_PropertyCount();
      void stub_get_Property();
      void stub_put_Property();
      void stub_get_DefaultDialectCount();
      void stub_get_DefaultDialect();
      void stub_AddDefaultDialect();
      void stub_RemoveDefaultDialect();
      [SecurityCritical, SuppressUnmanagedCodeSecurity]
      void get_LexiconCount([MarshalAs(UnmanagedType.I4)] out Int32 lexiconCount);
      [SecurityCritical, SuppressUnmanagedCodeSecurity]
      void get_Lexicon(Int32 index, [MarshalAs(UnmanagedType.Interface)] out ILexicon lexicon);
      [SecurityCritical, SuppressUnmanagedCodeSecurity]
      void AddLexicon([In, MarshalAs(UnmanagedType.Interface)] ILexicon lexicon);
      [SecurityCritical, SuppressUnmanagedCodeSecurity]
      void RemoveLexicon([In, MarshalAs(UnmanagedType.Interface)] ILexicon lexicon);
      void stub_get_Version();
      void stub_get_ResourceLoader();
      void stub_put_ResourceLoader();
      [SecurityCritical, SuppressUnmanagedCodeSecurity]
      void get_Options([MarshalAs(UnmanagedType.Interface)] out object val);
      void get_Capabilities(Int32 locale, [MarshalAs(UnmanagedType.Interface)] out object val);
      void stub_get_Lexicons();
      void stub_put_Lexicons();
      void stub_get_MaxSentences();
      void stub_put_MaxSentences();
      void stub_get_IsSingleLanguage();
      void stub_put_IsSingleLanguage();
      void stub_get_IsSimpleWordBreaking();
      void stub_put_IsSimpleWordBreaking();
      void stub_get_UseRelativeTimes();
      void stub_put_UseRelativeTimes();
      void stub_get_IgnorePunctuation();
      void stub_put_IgnorePunctuation();
      void stub_get_IsCaching();
      void stub_put_IsCaching();
      void stub_get_IsShowingGaps();
      void stub_put_IsShowingGaps();
      void stub_get_IsShowingCharacterNormalizations();
      void stub_put_IsShowingCharacterNormalizations();
      void stub_get_IsShowingWordNormalizations();
      void stub_put_IsShowingWordNormalizations();
      void stub_get_IsComputingCompounds();
      void stub_put_IsComputingCompounds();
      void stub_get_IsComputingInflections();
      void stub_put_IsComputingInflections();
      void stub_get_IsComputingLemmas();
      void stub_put_IsComputingLemmas();
      void stub_get_IsComputingExpansions();
      void stub_put_IsComputingExpansions();
      void stub_get_IsComputingBases();
      void stub_put_IsComputingBases();
      void stub_get_IsComputingPartOfSpeechTags();
      void stub_put_IsComputingPartOfSpeechTags();
      void stub_get_IsFindingDefinitions();
      void stub_put_IsFindingDefinitions();
      void stub_get_IsFindingDateTimeMeasures();
      void stub_put_IsFindingDateTimeMeasures();
      void stub_get_IsFindingPersons();
      void stub_put_IsFindingPersons();
      void stub_get_IsFindingLocations();
      void stub_put_IsFindingLocations();
      void stub_get_IsFindingOrganizations();
      void stub_put_IsFindingOrganizations();
      void stub_get_IsFindingPhrases();
      void stub_put_IsFindingPhrases();
    }

    [ComImport]
    [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    [Guid("004CD7E2-8B63-4ef9-8D46-080CDBBE47AF")]
    internal interface ILexicon
    {
      void ReadFrom([MarshalAs(UnmanagedType.BStr)]string fileName);
      void stub_WriteTo();
      void stub_GetEnumerator();
      void stub_IndexOf();
      void stub_TagFor();
      void stub_ContainsPrefix();
      void stub_Add();
      void stub_Remove();
      void stub_Version();
      void stub_Count();
      void stub__NewEnum();
      void stub_get_Item();
      void stub_set_Item();
      void stub_get_ItemByName();
      void stub_set_ItemByName();
      void stub_get0_PropertyCount();
      void stub_get1_Property();
      void stub_set_Property();
      void stub_get_IsReadOnly();
    }
    #endregion
  }
}

此代码依赖于我的反射助手类：

using System;
using System.Linq;
using System.Reflection;

namespace Melville.Library.ReflectionHelpers
{
  public static class ReflectionHelper
  {
    public static void SetField(this object target, string property, object value)
    {
      Field(target, property).SetValue(target, value);
    }

    public static object GetField(this object target, string name)
    {
      return Field(target, name).GetValue(target);
    }

    private static FieldInfo Field(object target, string name)
    {
      return target.GetType().GetField(name, 
        BindingFlags.NonPublic | BindingFlags.Public |BindingFlags.GetField|
        BindingFlags.FlattenHierarchy|BindingFlags.Instance);
    }

    public static object GetProperty(this object target, string name)
    {
      return Property(target, name).
        GetValue(target);
    }

    private static PropertyInfo Property(object target, string name)
    {
      return target.GetType().GetProperty(name, 
        BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.GetProperty|BindingFlags.FlattenHierarchy|BindingFlags.Instance);
    }

    public static void SetProperty(this object target, string property, object value)
    {
      Property(target, property).SetValue(target, value);
    }

    private const BindingFlags MethodBindingFlags = BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.InvokeMethod | BindingFlags.FlattenHierarchy | BindingFlags.Instance;

    private static MethodInfo Method(object target, string name, Type[] types)
    {
      return target.GetType().GetMethod(name,
        MethodBindingFlags, null, CallingConventions.Any, types, null) ;
    }

    public static MethodInfo Method(object target, string name)
    {
      var methodInfos = target.GetType().GetMethods(MethodBindingFlags);
      return methodInfos.FirstOrDefault(i=>i.Name.Equals(name, StringComparison.Ordinal));
    }

    public static object Call(this object target, string methodName, params object[] paramenters)
    {
      return Method(target, methodName, paramenters.Select(i => i.GetType()).ToArray()).Invoke(target, paramenters);
    }
  }
}

Answer 2

您可以创建包含自定义lex字典的临时文件。

FileSystemHelper只是一个助手类，但它只是使用Path和Directories类来创建File

public Uri CreateCustomLexiconDictionary()
{
 if (!_fileSystemHelper.Exists(_customDictionaryLocation))
 {
   _fileSystemHelper.AppendLine(_customDictionaryLocation, @"Line");
  }
  if ((_fileSystemHelper.Exists(_customDictionaryLocation) && customDictionaries.Count == 0))
                return new Uri("file:///" + _customDictionaryLocation);
  }
 }

从这里开始，您使用的每个TextBoxes只需调用CreateCustomLexiconDictionary，然后将其添加到SpellCheck的Dictionaries对象中。

IList dictionaries = SpellCheck.GetCustomDictionaries(tb);
dictionaries.Add(CreateCustomLexiconDictionary());

一旦完成，您就可以将URI删除到字典中，这样它就可以清理它。完成后也要删除该文件。

而且，RichTextBox SpellCheck真的很慢，微软也意识到了这一点。