走进c#(类型转换的一个类Object对象转int String double byte[] Stream)
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转自：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转 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转换为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转换为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转换为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 转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("该格式无法转换"); return null; } } #endregion }}- 走进c#(类型转换的一个类Object对象转int String double byte[] Stream)
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