一个自定义类,用于大规模的字符串连接,如拼接SQL语句。用流技术实现的,很好呦!!
using System;
using System.IO;
using System.Text;
using System.Windows.Forms;
namespace SuperString
{
/// <summary>
/// 创 建 者: superhood
/// 内容描述: 增强字符串类
/// </summary>
public class CSuperString
{
/// <summary>
/// 功能简述: 运算符重载
/// </summary>
/// <param name="Left">左参数</param>
/// <param name="Right">右参数</param>
/// <returns>文本类</returns>
public static CSuperString operator + (string Left,CSuperString Right)
{
byte[] btyLeft = Encoding.Default.GetBytes(Left);//返回左参数数组
byte[] btyRight = new Byte[Right.iLength];//返回右参数数组
Right.iTextLength += Left.Length;//设置右参数文本长度
Right.iLength = btyLeft.Length + btyRight.Length;//设置右参数字节长度
Right.memStrm.Position = 0;//将右参数流位置置0
Right.memStrm.Read(btyRight,0,btyRight.Length);//将右参数数据读出
Right.memStrm.Position = 0;//将右参数流位置置0
Right.memStrm.Write(btyLeft,0,btyLeft.Length);//将字符串(字节数组)写入右参数
Right.memStrm.Write(btyRight,0,btyRight.Length);//将右参数原有信息写回(加在左参数字符串后)
return Right;//返回右参数
}
/// <summary>
/// 功能简述: 运算符重载
/// </summary>
/// <param name="Left">左参数</param>
/// <param name="Right">右参数</param>
/// <returns>文本类</returns>
public static CSuperString operator + (CSuperString Left,string Right)
{
byte[] btyRight = Encoding.Default.GetBytes(Right);//将右参数(字符串)转换为字节数组
Left.memStrm.Position = Left.iLength;//设置左参数流的位置
Left.memStrm.Write(btyRight,0,btyRight.Length);//将右参数字符串写入流
Left.iTextLength += Right.Length;//设置左参数文本长度
Left.iLength += btyRight.Length;//设置左参数字节长度
return Left;//返回左参数
}
/// <summary>
/// 功能简述: 运算符重载
/// </summary>
/// <param name="Left">左参数</param>
/// <param name="Right">右参数</param>
/// <returns>文本类</returns>
public static CSuperString operator + (CSuperString Left,CSuperString Right)
{
byte[] btyRight = new Byte[Right.iLength];//声明字节数组(右参数)
Right.memStrm.Position = 0;//将右参数流位置置0
Right.memStrm.Read(btyRight,0,btyRight.Length);//将右参数(字符串)转换为字节数组
Left.memStrm.Position = 0;//将左参数流位置置0
Left.memStrm.Write(btyRight,0,btyRight.Length);//将右参数字符串写入流
Left.iTextLength += Right.iTextLength;//设置左参数文本长度
Left.iLength += Right.iLength;//设置左参数字节长度
return Left;//返回左参数
}
/// <summary>
/// 功能简述: 流中有效字节长度
/// </summary>
private int iLength = 0;
/// <summary>
/// 功能简述: 流中文本长度
/// </summary>
private int iTextLength = 0;
/// <summary>
/// 功能简述: 内存流
/// </summary>
private MemoryStream memStrm;
/// <summary>
/// 功能简述: 构造函数
/// </summary>
public CSuperString()
{
memStrm = new MemoryStream();//初始化流
}
/// <summary>
/// 功能简述: 构造函数
/// </summary>
/// <param name="DefaultLength">默认长度(以字节为单位)</param>
public CSuperString(int DefaultLength)
{
memStrm = new MemoryStream(DefaultLength);//初始化流
}
/// <summary>
/// 功能简述: 属性,字节长度
/// </summary>
public int Length
{
get
{
return iLength;
}
}
/// <summary>
/// 功能简述: 属性,文本长度
/// </summary>
public int TextLength
{
get
{
return iTextLength;
}
}
/// <summary>
/// 功能简述: 属性,流长度
/// </summary>
public int Capacity
{
get
{
return memStrm.Capacity;
}
set
{
if (value >= iLength)
memStrm.Capacity = value;
else
memStrm.Capacity = iLength;
}
}
/// <summary>
/// 功能简述: 向类中添加字符串
/// </summary>
/// <param name="Date"></param>
public void AddString (string Date)
{
byte[] btyDate = Encoding.Default.GetBytes(Date);//字符串转换为字节数组
memStrm.Position = iLength;//设置流的位置
memStrm.Write(btyDate,0,btyDate.Length);//将字符串写入流
iTextLength += Date.Length;//设置文本长度
iLength += btyDate.Length;//设置字节长度
}
/// <summary>
/// 功能简述: 返回文本
/// </summary>
/// <returns>返回字符串</returns>
public override string ToString()
{
memStrm.Position = 0;//设置流的位置
byte[] btyDate = new byte[iLength];//声明字节数组
memStrm.Read(btyDate,0,iLength);//将流内容读入数组
return Encoding.Default.GetString(btyDate);//将字节数组转换为字符串并返回
}
/// <summary>
/// 功能简述: 将字符串写入文件
/// </summary>
/// <param name="FileName">文件名</param>
public void WriteToFile(string FileName)
{
FileStream strm = new FileStream(FileName,FileMode.OpenOrCreate,FileAccess.Write);//初始化文件流
//判断流长度用来确定流中是否有冗余信息
if (memStrm.Length > iLength)
{//有
memStrm.Position = 0;//设置流的位置
byte[] btyDate = new byte[iLength];//声明字节数组
memStrm.Read(btyDate,0,iLength);//将流内容读入数组
strm.Write(btyDate,0,iLength);//将流内容写入文件
}
else
{//没有
memStrm.WriteTo(strm);//将流中文本写入文件
}
strm.Close();//关闭文件
}
/// <summary>
/// 功能简述: 将字符串写入流
/// </summary>
/// <param name="strm">流</param>
public void WriteToStream(Stream strm)
{
//判断流长度用来确定流中是否有冗余信息
if (memStrm.Length > iLength)
{//有
memStrm.Position = 0;//设置流的位置
byte[] btyDate = new byte[iLength];//声明字节数组
memStrm.Read(btyDate,0,iLength);//将流内容读入数组
strm.Write(btyDate,0,iLength);//将数组内容写入另一流
}
else
{//没有
memStrm.WriteTo(strm);//将流中文本写入另一流
}
}
/// <summary>
/// 功能简述: 清除流
/// </summary>
public void Clear()
{
iLength = 0;//将流字节长度设为0
iTextLength = 0;//将流文本长度设为0
}
}
}