using System;
using System.Collections.Generic;
using System.Text;
using System.Text.RegularExpressions;
using System.Collections;
using System.IO;
/// <summary>
/// 表示一个文本模板，该类使用一个字符串作为模板，通过将模板中的标志替换为对应的值（模板中的标志用 {标志名} 表示）生成新的文本
/// </summary>
/// <example>以下代码用文本模板生成IMG标志
/// <code>
/// static class Program
/// {
///  [STAThread]
///  static void Main()
///  {
///   TextTemplate temp = new TextTemplate("<img src='{src}' alt='{alt}' />");
///   Console.WriteLine(temp.Render("pic.bmp","Image"));
///   Hashtable values = new Hashtable();
///   values.Add("src", "pic.bmp");
///   values.Add("alt", "image");
///   Console.WriteLine(temp.Render(values));
///  }
/// }
///
/// 输出为：
/// <img src='pic.bmp' alt='Image' />
/// <img src='pic.bmp' alt='image' />
///
/// </code>
/// </example>
public class TextTemplate
{
 TextTemplateTag[] _tags;
 String[] _contentParts;
 int _tagCount;
 private TextTemplate()
 {
  _tagCount = 0;
  _tags = null;
  _contentParts = null;
 }
 /// <summary>
 /// 用指定的模板初始化TextTemplate
 /// </summary>
 /// <param name="content">模板内容</param>
 public TextTemplate(String content)
 {
  FromString(content);
 }
 /// <summary>
 /// 用指定的模板初始化TextTemplate,模板内容重文件读入
 /// </summary>
 /// <param name="file">模板文件位置</param>
 /// <param name="encoding">文件使用的编码</param>
 public TextTemplate(string file, Encoding encoding)
 {
  StreamReader sr = new StreamReader(file, encoding);
  try
  {
   string content = sr.ReadToEnd();
   FromString(content);
  }
  catch (Exception)
  {
   sr.Close();
   throw;
  }
  sr.Close();
 }
 /// <summary>
 /// 读入模板并以标志为分割点分割模板
 /// </summary>
 /// <param name="content"></param>
 private void FromString(String content)
 {
  MatchCollection mc = Regex.Matches(content, "{\\w+}");
  _tagCount = mc.Count;
  _tags = new TextTemplateTag[mc.Count];
  _contentParts = new string[mc.Count + 1];
  int index = 0;
  foreach (Match m in mc)
  {
   _tags[index++] = new TextTemplateTag(m.Value.Substring(1, m.Value.Length - 2), m.Index, m.Length);
  }
  int start = 0;
  index = 0;
  foreach (TextTemplateTag con in _tags)
  {
   _contentParts[index] = content.Substring(start, con.Position - start);
   start = con.Position + con.Length;
   index++;
  }
  if (start < content.Length) _contentParts[index] = content.Substring(start);
 }
 /// <summary>
 /// 用指定的值生成文本
 /// </summary>
 /// <param name="values">各标志对应的值（用标志名作为key）</param>
 /// <returns>生成的文本</returns>
 /// <example>以下代码用文本模板生成IMG标志
 /// <code>
 /// static class Program
 /// {
 ///  [STAThread]
 ///  static void Main()
 ///  {
 ///   TextTemplate temp = new TextTemplate("<img src='{src}' alt='{alt}' />");
 ///   Console.WriteLine(temp.Render("pic.bmp","Image"));
 ///   Hashtable values = new Hashtable();
 ///   values.Add("src", "pic.bmp");
 ///   values.Add("alt", "image");
 ///   Console.WriteLine(temp.Render(values));
 ///  }
 /// }
 ///
 /// 输出为：
 /// <img src='pic.bmp' alt='Image' />
 /// <img src='pic.bmp' alt='image' />
 ///
 /// </code>
 /// </example>
 public string Render(Hashtable values)
 {
  StringBuilder result = new StringBuilder(8 * 1024);
  int i = 0;
  for (i = 0; i < _tagCount; i++)
  {
   result.Append(_contentParts[i]);
   if (values[_tags[i].Name] != null)
    result.Append(values[_tags[i].Name]);
   else
    result.Append("{" + _tags[i].Name + "}");
  }
  result.Append(_contentParts[i]);
  return result.ToString();
 }
 /// <summary>
 /// 用指定的值生成文本
 /// </summary>
 /// <param name="args">各标志对应的值(忽略标志名，第一个标志对应第一个参数，以此类推)</param>
 /// <returns>生成的文本</returns>
 /// <example>以下代码用文本模板生成IMG标志
 /// <code>
 /// static class Program
 /// {
 ///  [STAThread]
 ///  static void Main()
 ///  {
 ///   TextTemplate temp = new TextTemplate("<img src='{src}' alt='{alt}' />");
 ///   Console.WriteLine(temp.Render("pic.bmp","Image"));
 ///   Hashtable values = new Hashtable();
 ///   values.Add("src", "pic.bmp");
 ///   values.Add("alt", "image");
 ///   Console.WriteLine(temp.Render(values));
 ///  }
 /// }
 ///
 /// 输出为：
 /// <img src='pic.bmp' alt='Image' />
 /// <img src='pic.bmp' alt='image' />
 ///
 /// </code>
 /// </example>
 public string Render(params object[] args)
 {
  StringBuilder result = new StringBuilder(2 * 1024);
  int i = 0;
  for (i = 0; i < _tagCount; i++)
  {
   result.Append(_contentParts[i]);
   result.Append(args[i].ToString());
  }
  result.Append(_contentParts[i]);
  return result.ToString();
 }
 /// <summary>
 /// 用指定的值生成文本，并保存到文件中
 /// </summary>
 /// <param name="file">要保存的文件路径</param>
 /// <param name="encoding">文件的编码</param>
 /// <param name="values">各标志对应的值（用标志名作为key）</param>
 public void SaveAs(string file, Encoding encoding, Hashtable values)
 {
  StreamWriter sw = new StreamWriter(file, false, encoding);
  try
  {
   String content = Render(values);
   sw.Write(content);
  }
  catch (Exception)
  {
   sw.Close();
   throw;
  }
  sw.Close();
 }
 /// <summary>
 /// 用指定的值生成文本，并保存到文件中
 /// </summary>
 /// <param name="file">要保存的文件路径</param>
 /// <param name="encoding">文件的编码</param>
 /// <param name="args">各标志对应的值(忽略标志名，第一个标志对应第一个参数，以此类推)</param>
 public void SaveAs(string file, Encoding encoding, params object[] args)
 {
  StreamWriter sw = new StreamWriter(file, false, encoding);
  try
  {
   String content = Render(args);
   sw.Write(content);
  }
  catch (Exception)
  {
   sw.Close();
   throw;
  }
  sw.Close();
 }
 /// <summary>
 /// 将模板以指定的分隔标志分隔成小模板
 /// </summary>
 /// <param name="splitTag"></param>
 /// <returns></returns>
 public TextTemplate[] Split(string splitTag)
 {
  List<TextTemplate> temps = new List<TextTemplate>();
  List<string> contentParts = new List<string>();
  List<TextTemplateTag> tags = new List<TextTemplateTag>();
  int i = 0;
  foreach (string content in _contentParts)
  {
   contentParts.Add(content);
   if (i >= _tags.Length || _tags[i].Name == splitTag)
   {
    TextTemplate newTemp = new TextTemplate();
    newTemp._contentParts = contentParts.ToArray();
    newTemp._tags = tags.ToArray();
    newTemp._tagCount = tags.Count;
    temps.Add(newTemp);
    contentParts.Clear();
    tags.Clear();
   }
   else
    tags.Add(new TextTemplateTag(_tags[i].Name, _tags[i].Position, _tags[i].Length));
   i++;
  }
  return temps.ToArray();
 }
}
internal class TextTemplateTag
{
 int _position, _length;
 string _name;
 public TextTemplateTag(string name, int pos, int len)
 {
  _name = name;
  _position = pos;
  _length = len;
 }
 public string Name
 {
  get { return _name; }
 }
 public int Position
 {
  get { return _position; }
 }
 public int Length
 {
  get { return _length; }
 }
}

static class Program
{
 [STAThread]
 static void Main()
 {
  TextTemplate temp = new TextTemplate("<img src='{src}' alt='{alt}' />");
  Console.WriteLine(temp.Render("pic.bmp","Image"));
  Hashtable values = new Hashtable();
  values.Add("src", "pic.bmp");
  values.Add("alt", "image");
  Console.WriteLine(temp.Render(values));
 }
}

<?xml version="1.0"?>
<configuration xmlns="http://schemas.microsoft.com/.NetConfiguration/v2.0">
 <appSettings></appSettings>
 <connectionStrings>
  <add
   name="DJDB.LocalSqlServer"
   connectionString="{CONNECTIONSTRING}"
   providerName="System.Data.SqlClient"
  />
 </connectionStrings>
 其他配置
</configuration>