/// <summary>
        /// byte转换为GB/MB/KB    ，by 何问起
        /// </summary>
        /// <param name="KSize"></param>
        /// <returns></returns>
        KeyValuePair<string, double> HtConvertByteUnit(long KSize)
        {
            KeyValuePair<string, double> m_kv;// = new KeyValuePair<string, double>();
            int m_GB = 1024 * 1024 * 1024;//定义GB的计算常量
            int m_MB = 1024 * 1024;//定义MB的计算常量
            int m_KB = 1024;//定义KB的计算常量

            if (KSize / m_GB >= 1)//如果当前Byte的值大于等于1GB
            {
                m_kv = new KeyValuePair<string, double>("GB", Math.Round(KSize / (float)m_GB, 2));
               //将其转换成GB
            }
            else if (KSize / m_MB >= 1)//如果当前Byte的值大于等于1MB
            {
                m_kv = new KeyValuePair<string, double>("MB", Math.Round(KSize / (float)m_MB, 2));

               //将其转换成MB
            }
            else if (KSize / m_KB >= 1)//如果当前Byte的值大于等于1KB
            {
                m_kv = new KeyValuePair<string, double>("KB", Math.Round(KSize / (float)m_KB, 2));

                //将其转换成KB
            }
            else
            {
                m_kv = new KeyValuePair<string, double>("Byte", KSize);

                //显示Byte值
            }

            return m_kv;
        }

KeyValuePair<string, double> m_kv = HtConvertByteUnit(25645);
string m_hovertreeSize=m_kv.Value+ m_kv.Key;