这是文件的代码：
.txt:
China Chinese Chinaman chinaberry
baa baal
aa aaa aaal
.cs:
using System;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Ink;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.Collections;
using System.Collections.Generic;
using System.Text;
using System.Windows.Resources;
using System.IO;
namespace Demo5.Data
{
public static class Extensions
{
/// <summary>
/// Return a random item from a list.
/// </summary>
/// <typeparam name="T">The item type.</typeparam>
/// <param name="rnd">The Random instance.</param>
/// <param name="list">The list to choose from.</param>
/// <returns>A randomly selected item from the list.</returns>
public static T Next<T>(this Random rnd, IList<T> list)
{
return list[rnd.Next(list.Count)];
}
}
public class MyText : IEnumerable<string>
{
public enum Capitalization
{
None,
FirstWord,
AllWords
}
private static Random _rnd = new Random(42);
private static StringBuilder _builder = new StringBuilder();
private static List<string> _sentences;
private static List<string> _words;
/// <summary>
/// Returns random lorem ipsum sentences combined into a single string.
/// </summary>
/// <param name="sentenceCount">The nunmber of sentences.</param>
/// <returns>The paragraph, composed of random sentences.</returns>
public static string GetParagraph(int sentenceCount)
{
EnsureSentences();
_builder.Length = 0;
while (sentenceCount-- > 0)
{
_builder.Append(_rnd.Next(_sentences));
if (sentenceCount > 0)
{
_builder.Append(' ');
}
}
return _builder.ToString();
}
/// <summary>
/// Return an alphabetized, lower-case list of lorem ipsum words.
/// </summary>
public static ICollection<string> Words
{
get
{
EnsureWords();
return (ICollection<string>)_words;
}
}
/// <summary>
/// Get a string composed of random lorem ipsum words. Will not end with punctuation.
/// </summary>
/// <param name="wordCount">Number of words.</param>
/// <param name="capitalize">How to capitalize the words.</param>
/// <returns></returns>
public static string GetWords(int wordCount, Capitalization capitalization)
{
EnsureWords();
_builder.Length = 0;
while (wordCount-- > 0)
{
int position = _builder.Length;
_builder.Append(_rnd.Next(_words));
if (capitalization == Capitalization.AllWords || (position == 0 && capitalization == Capitalization.FirstWord))
{
_builder[position] = char.ToUpper(_builder[position]);
}
if (wordCount > 0)
{
_builder.Append(' ');
}
}
return _builder.ToString();
}
/// <summary>
/// Enumerates the Words property.
/// </summary>
/// <returns>The enumerator.</returns>
public IEnumerator<string> GetEnumerator()
{
return MyText.Words.GetEnumerator();
}
/// <summary>
/// Enumerates the Words property.
/// </summary>
/// <returns>The enumerator.</returns>
IEnumerator IEnumerable.GetEnumerator()
{
return MyText.Words.GetEnumerator();
}
/// <summary>
/// Reads the lorem ipsum sentences. Supplies some data in case reading fails, which
/// it will do at design time.
/// </summary>
private static void EnsureSentences()
{
if (_sentences == null)
{
_sentences = new List<string>();
StreamResourceInfo info = Application.GetResourceStream(new Uri("MyTexts.txt", UriKind.Relative));
if (info != null)
{
Stream stream = info.Stream;
if (stream != null)
{
using (StreamReader reader = new StreamReader(stream))
{
while (!reader.EndOfStream)
{
_sentences.Add(reader.ReadLine());
}
};
}
}
if (_sentences.Count == 0)
{
_sentences.Add("no words");
}
}
}
/// <summary>
/// Creates an alphabetized list of the words from the lorem ipsum text.
/// </summary>
private static void EnsureWords()
{
char[] separators = { ' ', ',', '.' };
EnsureSentences();
if (_words == null)
{
Dictionary<string, object> temp = new Dictionary<string, object>();
foreach (string sentence in _sentences)
{
string[] words = sentence.Split(separators, StringSplitOptions.RemoveEmptyEntries);
foreach (string word in words)
{
temp[word.ToLower()] = null;
}
}
_words = new List<string>(temp.Keys);
_words.Sort();
}
}
}
}
