走進c#(類型轉換的一個類Object對象轉int String double byte[] Stream)

轉自：http://www.cnblogs.com/dengw009/archive/2011/07/22/2114258.html

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.IO;namespace Test2{    class MyConvert    {        #region string轉        public static DateTime getDateTime(Object value)        {            try            {                if (value == null)                {                    return DateTime.Parse("0000/00/00 00:00:00");                }                switch(value.GetType().ToString())                {                    case "System.String":                            return DateTime.Parse((String)value);                    case "System.Int64":                        return MyConvert.getDateTime(MyConvert.getString(value));                    case "System.Int32":                        return MyConvert.getDateTime(MyConvert.getString(value));                    case "System.Boolean":                        return MyConvert.getDateTime(MyConvert.getString(value));                    case "System.Double":                        return MyConvert.getDateTime(MyConvert.getString(value));                    case "System.IO.MemoryStream":                        return MyConvert.getDateTime(MyConvert.getString(value));                    case "System.Byte[]":                        return MyConvert.getDateTime(MyConvert.getString(value));                    default:                        return DateTime.Parse("0000/00/00 00:00:00");                                    }                          }            catch(Exception) {                return DateTime.Parse("0000/00/00 00:00:00");            }        }        //string轉換為Int32        public static int getInt(Object value)        {            try            {                if (value == null)                {                    return 0;                }                switch(value.GetType().ToString())                {                    case "System.String":                        return Int32.Parse((string)value);                    case "System.Int64":                        return Int32.Parse(((long)value).ToString());                    case "System.Int32":                        return (int)value;                    case "System.Double":                        return (int)System.Math.Round((double)value, 0);                    case "System.Boolean":                        return 0;                    case "System.DateTime":                        return 0;                    case "System.IO.MemoryStream":                        return MyConvert.getInt(MyConvert.getString(value));                    case "System.Byte[]":                        return MyConvert.getInt(MyConvert.getString(value));                    default:                        return 0;                }            }            catch{                return 0;            }        }        //string轉換為double        public static double getDouble(Object value)        {            try            {               if(value==null)               {                   return 0.0;               }               switch (value.GetType().ToString())                {                   case "System.String":                       return Double.Parse((string)value);                   case "System.Int64":                       return Double.Parse(((long)value).ToString());                   case "System.Int32":                       return Double.Parse(((int)value).ToString());                   case "System.Boolean":                       return 0.0;                   case "System.Double":                       return (int)System.Math.Round((double)value, 0);                   case "System.DateTime":                       return 0.0;                   case "System.IO.MemoryStream":                       return MyConvert.getInt(MyConvert.getString(value));                   case "System.Byte[]":                       return MyConvert.getInt(MyConvert.getString(value));                   default:                       return 0;               }            }            catch            {                return 0.0;            }        }        public static Stream getStream(Object value)        {            try            {                if (value == null)                {                    return new MemoryStream(Encoding.Default.GetBytes("null"));                }                switch (value.GetType().ToString())                 {                    case "System.String":                        return new MemoryStream(Encoding.Default.GetBytes((string)value));                    case "System.Int64":                        return new MemoryStream(Encoding.Default.GetBytes(MyConvert.getString(value)));                    case "System.Int32":                        return new MemoryStream(Encoding.Default.GetBytes(MyConvert.getString(value)));                    case "System.Boolean":                        return new MemoryStream(Encoding.Default.GetBytes(MyConvert.getString(value)));                    case "System.DateTime":                        return new MemoryStream(Encoding.Default.GetBytes(MyConvert.getString(value)));                    case "System.Byte[]":                        return new MemoryStream(Encoding.Default.GetBytes(MyConvert.getString(value)));                    default:                        return new MemoryStream(Encoding.Default.GetBytes("null"));                }            //    myStream = new MemoryStream(Encoding.Default.GetBytes(myString));              //  Console.WriteLine(new StreamReader(myStream).ReadToEnd());               // Console.WriteLine("myStream is " + myStream.Read());            }            catch{                return new MemoryStream(Encoding.Default.GetBytes("null"));            }        }                 //string轉換為byte[]        public static byte[] getByte(Object value)        {            try            {                if (value == null)                 {                    return null;                }                switch(value.GetType().ToString())                {                    case "System.String":                        return Encoding.Default.GetBytes((string)value);                    case "System.Int64":                        return Encoding.Default.GetBytes(MyConvert.getString(value));                    case "System.Int32":                        return Encoding.Default.GetBytes(MyConvert.getString(value));                    case "System.Boolean":                        return Encoding.Default.GetBytes(MyConvert.getString(value));                    case "System.DateTime":                        return Encoding.Default.GetBytes(MyConvert.getString(value));                    case "System.IO.MemoryStream":                        return Encoding.Default.GetBytes(MyConvert.getString(value));                    default:                        return null;                                }            }            catch            {                return null;            }        }        #endregion        /******************************************* *  * *  * ****************************************/        #region 轉string        public static string getString(Object obj)         {                      switch (obj.GetType().ToString())            {                 case "System.DateTime":                    Console.WriteLine(((DateTime)obj).ToLongDateString());                    Console.WriteLine(((DateTime)obj).ToLongDateString().GetType());                    return ((DateTime)obj).ToLongDateString();                case "System.Int32":                    Console.WriteLine(((Int32)obj).ToString());                    Console.WriteLine(((Int32)obj).ToString().GetType());                    return ((Int32)obj).ToString();                case "System.Int64":                   Console.WriteLine(((Int64)obj).ToString());                   Console.WriteLine(((Int64)obj).ToString().GetType());                   return ((Int64)obj).ToString();                case "System.Double":                    Console.WriteLine(((double)obj).ToString());                    Console.WriteLine(((double)obj).ToString().GetType());                    return ((double)obj).ToString();                case "System.IO.MemoryStream":                     Stream s = (Stream)obj;                     StreamReader sr = new StreamReader(s);                  string  myString=string.Empty;                    while(sr.Peek()>-1)                    {                        string input = sr.ReadLine();                        myString += input;                    }                     Console.WriteLine(myString);                    Console.WriteLine(myString.GetType());                    return myString;                case "System.Byte[]":                    return Encoding.UTF8.GetString((byte[])obj);                case "System.Boolean":                   if((bool)obj==false)                       return "false";                    else return "true";                default:                    Console.WriteLine("該格式無法轉換");                    return null;            }        }        #endregion    }}