json序列化.xml序列化.图片转base64.base64转图片.生成缩略图.IEnumerable<TResult> Select<TSource, TResult>做数据转换的五种方式

 JSON序列化

    /// <summary>
    /// JSON序列化
    /// </summary>
    public  static class SPDBJsonConvert
    {
        /// <summary>
        /// 对象序列化JSON
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="t"></param>
        /// <returns></returns>
        public static string JsonSerializer<T>(T t)
        {
            DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(T));
            MemoryStream ms = new MemoryStream();
            ser.WriteObject(ms, t);
            string jsonString = Encoding.UTF8.GetString(ms.ToArray());
            ms.Close();
            return jsonString;
        }
        /// <summary>
        /// JSON序列化对象
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="jsonString"></param>
        /// <returns></returns>
        public static T JsonDeserialize<T>(string jsonString)
        {
            DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(T));
            MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(jsonString));
            T obj = (T)ser.ReadObject(ms);
            return obj;
        }
    }

 xml序列化

/// <summary>        
 
/// XML反序列化        
 
/// </summary>        
 
/// <param name="type">类型</param>        
 
/// <param name="xml">XML字符串</param>        
 
/// <returns></returns>        
 
public static object Deserialize(Type type, string xml)        
 
{            
 
try            
 
{                
 
using (StringReader sr = new StringReader(xml))                
 
{                    
 
XmlSerializer xmldes = new XmlSerializer(type);                   
 
  return xmldes.Deserialize(sr);         
 
        }        
 
     }         
 
    catch (Exception e)       
 
      {
 
                return null;     
 
        }      
 
   }
 
 /// <summary>      
 
 /// 序列化       
 
 /// </summary>  
 
 /// <param name="type">类型</param>        
 
/// <param name="obj">对象</param>        
 
/// <returns></returns>        
 
public static string Serializer(Type type, object obj)   
 
      {            
 
MemoryStream Stream = new MemoryStream();     
 
        XmlSerializer xml = new XmlSerializer(type);    
 
         try          
 
   {            
 
     //序列化对象         
 
        xml.Serialize(Stream, obj);     
 
        }         
 
    catch (InvalidOperationException)      
 
       {           
 
      throw;        
 
     }          
 
   Stream.Position = ;        
 
   StreamReader sr = new StreamReader(Stream);    
 
    string str = sr.ReadToEnd();
 
    sr.Dispose();    
 
    Stream.Dispose();
 
            return str;        
 
}

 图片转base64.base64转图片

/// <summary>        
 
/// 图片转base64        
 
/// </summary>        
 
/// <param name="filename"></param>        
 
public static string ImgToBase64String(string filename)        
 
{                
 
Bitmap bmp = new Bitmap(filename);
 
 MemoryStream ms = new MemoryStream();                
 
bmp.Save(ms, ImageFormat.Jpeg);                
 
byte[] arr = new byte[ms.Length];                
 
ms.Position = ;                
 
ms.Read(arr, , (int)ms.Length);                
 
ms.Close();                
 
String strbaser64 = Convert.ToBase64String(arr);          
 
   return strbaser64;       
 
  }

/// <summary>
        /// base64转图片
        /// </summary>
        /// <param name="base64Code"></param>
        public static Bitmap Base64StringToImage(string base64Code)
        {
                byte[] arr = Convert.FromBase64String(base64Code);
                MemoryStream ms = new MemoryStream(arr);
                Bitmap bmp = new Bitmap(ms);
                ms.Close();
            return bmp;
        }

 生成缩略图

/// <summary>       
 
  /// 生成缩略图        
 
/// </summary>        
 
/// <param name="img">原始图片</param>        
 
/// <param name="thumbnailImagePath">缩略图地址</param>        
 
/// <param name="width">图片宽度</param>        
 
/// <param name="height">图片高度</param>        
 
/// <param name="p"></param>        
 
public static void CutImage(Image img, string thumbnailImagePath, int width, int height)        
 
{           
 
  Image serverImage = img;            
 
//画板大小            
 
int towidth = width;         
 
    int toheight = height;        
 
     //缩略图矩形框的像素点       
 
      int x = ;         
 
    int y = ;          
 
   int ow = serverImage.Width;       
 
      int oh = serverImage.Height;
 
            if (ow > oh)         
 
    {             
 
    toheight = serverImage.Height * width / serverImage.Width;    
 
         }          
 
   else          
 
   {             
 
    towidth = serverImage.Width * height / serverImage.Height;   
 
          }       
 
      //新建一个bmp图片      
 
       Image bm = new Bitmap(width, height);      
 
       //新建一个画板          
 
   Graphics g = Graphics.FromImage(bm);   
 
          //设置高质量插值法     
 
        g.InterpolationMode = InterpolationMode.High;    
 
         //设置高质量,低速度呈现平滑程度     
 
        g.SmoothingMode = SmoothingMode.HighQuality;  
 
           //清空画布并以透明背景色填充        
 
     g.Clear(Color.White);         
 
    //在指定位置并且按指定大小绘制原图片的指定部分  
 
           g.DrawImage(serverImage, new Rectangle((width - towidth) / , (height - toheight) / , towidth, toheight),                 , , ow, oh,                 GraphicsUnit.Pixel);
 
            //以jpg格式保存缩略图      
 
       bm.Save(thumbnailImagePath, ImageFormat.Jpeg);  
 
           serverImage.Dispose();       
 
      bm.Dispose();       
 
      g.Dispose();      
 
   }

  很多时候很多状态数据库里可能都是保存的int。

                        但是在web上要转换成string.由于model要映射到数据库。

                              一般不能随意添加字段。所以在此提供一个方便的数据转换方法。

                                       至少不用写个循环去匹配每个字段

方式1

 List<EntityBM_CompanyDept> result = data.Select(ConvertBM_CompanyDept).ToList();
 
/// <summary>
        /// 数据转换
        /// </summary>
        /// <param name="model"></param>
        /// <returns></returns>
        [NonAction]
        protected virtual EntityBM_CompanyDept ConvertBM_CompanyDept(BM_CompanyDept model)
        {
            return new EntityBM_CompanyDept()
            {
                Id = model.Id,
                DeptId = model.DeptId,
                DeptName = model.DeptName,
                ParentDeptId = model.ParentDeptId,
                LevelCode = model.LevelCode,
                IsCostCenter = model.IsCostCenter,
                IsProfitCenter = model.IsProfitCenter,
                CompanyDeptStatus = model.CompanyDeptStatus,
                Result = ""
            };
        }

方式二

 List<EntityBM_CompanyDept> l = data.Select<BM_CompanyDept, EntityBM_CompanyDept>((dr) =>                   
 
  {                        
 
EntityBM_CompanyDept m = new EntityBM_CompanyDept()                
 
         {                             Id = dr.Id
 
//这里写转换字段
 
  };                      
 
   return m;               
 
      }).ToList<EntityBM_CompanyDept>();

方式三

      List<EntityBM_CompanyDept> l1 = data.Select((BM_CompanyDept) =>                     {                     
 
    EntityBM_CompanyDept m = new EntityBM_CompanyDept()                  
 
       {                             Id = BM_CompanyDept.Id,//转换字段
 
                        };                  
 
       return m;                 
 
    }).ToList<EntityBM_CompanyDept>();

　　方式四

 List<ExtraterritorialDataDto> rows = new List<ExtraterritorialDataDto>();
 
  if (rows != null)
                {
                    rows = rows.Select(a => new ExtraterritorialDataDto
                    {
                        Id = a.Id,//主键列
                        messagesubject = a.messagesubject,//主题
                        senderaddress = a.senderaddress,//发送者
                        Month = a.datetime.ToString(),//年月日
                        recipientaddress = a.recipientaddress//接受者
                    }).ToList();
 
                }

方式五

List<ExtraterritorialDataDto> rows = new List<ExtraterritorialDataDto>();
 
if (rows != null)
                {
                  var  rows2 = rows.Select(a => new
                    {
                        Id = a.Id,//主键列
                        messagesubject = a.messagesubject,//主题
                        senderaddress = a.senderaddress,//发送者
                        Month = a.datetime.ToString(),//年月日
                        recipientaddress = a.recipientaddress//接受者
                    }).ToList();
 
                }

方式四和方式五的差距在于一个是显式类型。一个是匿名类型