文件大小KB转换MB

 

this.txtFile.Text = UpFile(this.FileUpload4);
            int i = FileUpload4.PostedFile.ContentLength;
            double j =Round( (double)i / (double)1024,2);
            txtFileSize.Text = j.ToString();

/// <summary>    
        /// 实现数据的四舍五入法　　 
        /// </summary>    
        /// <param name="v">要进行处理的数据</param>    
        /// <param name="x">保留的小数位数</param>    
        /// <returns>四舍五入后的结果</returns>    
        private double Round(double v, int x)
        {
            bool isNegative = false;
            if (v < 0)
            {
                isNegative = true;
                v = -v;
            }
            int IValue = 1;
            for (int i = 1; i <= x; i++)
            {
                IValue = IValue * 10;
            }
            double Int = Math.Round(v * IValue + 0.5, 0);
            v = Int / IValue; if (isNegative)
            {
                v = -v;
            }
            return v;
        }