/// <summary>
/// 字符串编码帮助类
/// </summary>
public class EncodingHelper
{
/// <summary>
/// 字符串编码转换
/// </summary>
/// <param name="srcEncoding">原编码</param>
/// <param name="dstEncoding">目标编码</param>
/// <param name="srcStr">原字符串</param>
/// <returns>字符串</returns>
