仿Delphi/BCB中的TStringList，用C#完成了一个StringList

  public class StringList
 {
  private int m_Capacity;
  private string[] m_Strings;
  private int m_Size;

  /// <summary>
  /// 数据个数属性
  /// </summary>
  public int Count
  {
   get
   {
    return m_Size;
   }
  }

  /// <summary>
  /// 缓存大小属性
  /// </summary>
  public int Capacity
  {
   get
   {
    return m_Capacity;
   }
   set
   {
    if( m_Strings == null )
    {
     return;
    }

    if( value != m_Strings.Length )
    {
     if (value < this.m_Size)
     {
      throw new ArgumentOutOfRangeException();
     }

     if (value > 0)
     {
      string[] objArray1 = new string[value];
      if (this.m_Size > 0)
      {
       Array.Copy(this.m_Strings, 0, objArray1, 0, this.m_Size);
      }
      this.m_Strings = objArray1;
     }
     else
     {
      this.m_Strings = new string[0x10];
     }
    }
   }
  }

  public string Text
  {
   get
   {
    return this.ToString();
   }
  }

  /// <summary>
  /// 构造函数
  /// </summary>
  public StringList() : this(10)
  {
  }

  /// <summary>
  /// 构造函数
  /// </summary>
  public StringList(int capacity)
  {
   m_Capacity = capacity;

   m_Strings = new string[capacity];
   m_Size = 0;
  }

  public void Dispose()
  {
  }

  /// <summary>
  /// 读取某行内容
  /// </summary>
  /// <param name="index"></param>
  public string this[int index]
  {
   get
   {
    if ((index < 0) || (index >= m_Size))
    {
     throw new ArgumentOutOfRangeException();
    }
    return this.m_Strings[index];
   }
   set
   {
    if ((index < 0) || (index >= m_Size))
    {
     throw new ArgumentOutOfRangeException();
    }
    this.m_Strings[index] = value;
   }
  }

  /// <summary>
  /// 调整缓存大小
  /// </summary>
  protected void EnsureCapacity(int min)
  {
   if (this.m_Strings.Length < min)
   {
    int num1 = (this.m_Strings.Length == 0) ? 0x10 : (this.m_Strings.Length * 2);
    if (num1 < min)
    {
     num1 = min;
    }
    this.Capacity = num1;
   }
  }

  /// <summary>
  /// 追加一行
  /// </summary>
  public int AppendText(string value)
  {
   if( this.Count == m_Strings.Length)
   {
    EnsureCapacity(this.Count + 1);
   }

   m_Strings[this.Count] = value;
   m_Size++;

   return m_Size;
  }

  /// <summary>
  /// 插入一行
  /// </summary>
  /// <param name="index"></param>
  public int InsertText(int index, string value)
  {
   if( index<0 )
   {
    index = 0;
   }

   if( this.Count == m_Strings.Length)
   {
    EnsureCapacity(this.Count + 1);
   }

   if( index < this.Count )
   {
    Array.Copy(this.m_Strings, index, this.m_Strings, index+1, this.m_Size - index);
   }

   m_Strings[index] = value;
   m_Size++;

   return m_Size;
  }

  /// <summary>
  /// 查找数据的位置
  /// </summary>
  public int IndexOf(string value)
  {
   return Array.IndexOf(this.m_Strings, value, 0, this.m_Size);
  }

  /// <summary>
  /// 删除一行
  /// </summary>
  /// <param name="index"></param>
  public void RemoveAt(int index)
  {
   if ((index < 0) || (index >= this.m_Size))
   {
    throw new ArgumentOutOfRangeException();
   }
   this.m_Size--;
   if (index < this.m_Size)
   {
    Array.Copy(this.m_Strings, index + 1, this.m_Strings, index, this.m_Size - index);
   }
   this.m_Strings[this.m_Size] = null;
  }

  /// <summary>
  /// 转换为字符串。
  /// </summary>
  public override string ToString()
  {
   System.Text.StringBuilder s = new System.Text.StringBuilder(this.Count);

   for(int i=0; i<this.Count; i++)
   {
    s.Append(m_Strings[i]+"/r/n");
   }

   return s.ToString();
  }

  /// <summary>
  /// 转换为字符串。
  /// </summary>
  /// <param name="startIndex"></param>
  /// <param name="count"></param>
  /// <returns></returns>
  public string ToString(int startIndex, int count)
  {
   if( startIndex < 0 )
   {
    startIndex = 0;
   }
   else if( startIndex >= this.Count )
   {
    return "";
   }

   if( count<=0)
   {
    return "";
   }
   
   if( count + startIndex > this.Count )
   {
    count = this.Count - startIndex;
   }

   System.Text.StringBuilder s = new System.Text.StringBuilder(this.Count);

   for(int i=startIndex; i<count; i++)
   {
    s.Append(m_Strings[i]+"/r/n");
   }

   return s.ToString();
  }

  /// <summary>
  /// 清除内容
  /// </summary>
  public void Clear()
  {
   this.m_Size = 0;
  }

  /// <summary>
  /// 保存为一个文件
  /// </summary>
  /// <param name="fileName"></param>
  /// <param name="encoding"></param>
  public void SaveToFile(string fileName, System.Text.Encoding encoding)
  {
   System.IO.StreamWriter sw2 = new System.IO.StreamWriter(fileName, false, encoding);
   for(int i=0; i<this.Count; i++)
   {
    sw2.Write(m_Strings[i]+"/r/n");
   }
   
   sw2.Close();
  }

  public void SaveToFile(string fileName)
  {
   System.IO.StreamWriter sw2 = new System.IO.StreamWriter(fileName, false, System.Text.ASCIIEncoding.Default);
   for(int i=0; i<this.Count; i++)
   {
    sw2.Write(m_Strings[i]+"/r/n");
   }
   
   sw2.Close();
  }

  /// <summary>
  /// 读入一个文本文件
  /// </summary>
  /// <param name="fileName"></param>
  public void LoadFromFile(string fileName)
  {
   this.Clear();

   System.IO.StreamReader sr2 = new System.IO.StreamReader(fileName, System.Text.ASCIIEncoding.Default);
   
   while(sr2.Peek() >= 0)
   {
    this.AppendText(sr2.ReadLine());
   }

   sr2.Close();
  }

  public void LoadFromFile(string fileName, System.Text.Encoding encoding)
  {
   this.Clear();

   System.IO.StreamReader sr2 = new System.IO.StreamReader(fileName, encoding);
   
   while(sr2.Peek() >= 0)
   {
    this.AppendText(sr2.ReadLine());
   }

   sr2.Close();
  }
 }