PictureControl

namespace AuthenticationTestClient
{
     using System;
     using System.Drawing;
     using System.Windows.Forms;
     using System.IO;
     /// <summary>
     /// PictureControl的摘要描述。
     /// </summary>
     public class PictureControl
     {
         public PictureControl(){}
        
         [FlagsAttribute]
             public enum ImgStyle {JPG, BMP, GIF};

         private byte[] _ImgArray = new byte[1];
         private Image _Image;
         public byte[] ImgArray
         {
             get
             {
                 if (_ImgArray == null){ return null;}
                 return _ImgArray;
             }
         }

         public Image Image
         {
             get
             {
                 if (_Image == null) return null;
                 return _Image;
             }
         }

         /// <summary>
         ///装载图片
         /// </summary>
         /// <param name="FilterStyle"></param>
         /// <returns></returns>
         public static PictureControl LoadImage (ImgStyle FilterStyle)
         {
             PictureControl PC = new PictureControl ();
             OpenFileDialog FileDialog = new OpenFileDialog ();
             FileDialog.Filter = PC.CombinFilter (FilterStyle);

             if (FileDialog.ShowDialog() == DialogResult.OK)
             {
                
                 PC._Image = Image.FromFile (FileDialog.FileName);
                 FileStream fStream = new FileStream (FileDialog.FileName,
                     FileMode .Open, FileAccess.Read, FileShare.Read);
                 PC._ImgArray = new byte[fStream.Length];
                 fStream.Read (PC._ImgArray, 0, (int)fStream.Length);
                 fStream.Flush ();
                 fStream.Close ();
                
                
             }
             else
             {
                 return null;
             }
             FileDialog.Dispose ();
             return PC;
         }

         public static PictureControl ShowImage (byte[] ImgArray)
         {
             MemoryStream mStream = new MemoryStream ();
             mStream.Write (ImgArray, 0, ImgArray.Length );
             PictureControl PC = new PictureControl ();
             PC._Image = Image.FromStream (mStream);
             return PC ;
         }

         /// <summary>
         ///合并enum
         /// </summary>
         /// <param name="FilterStyle"></param>
         /// <returns></returns>
         private string CombinFilter (ImgStyle FilterStyle)
         {
             string FilterString = "";
             ImgStyle[] StyleArray = (ImgStyle[])Enum.GetValues (FilterStyle.GetType());
             for (int i = 0; i < StyleArray.Length; i++)
             {
                 if (FilterString == "")
                     FilterString = FilterStr(StyleArray[i]);
                 else
                 {
                     FilterString = FilterString + '|' + FilterStr (StyleArray[i]);
                 }
             }
             return FilterString;
         }

         /// <summary>
         ///取得实际的筛选值
         /// </summary>
         /// <param name="FilterStyle"></param>
         /// <returns></returns>
         private string FilterStr (ImgStyle FilterStyle)
         {
             string FilterString = "";
             switch (FilterStyle)
             {
                 case ImgStyle.BMP:
                     FilterString = "BMP (*.bmp)|*.bmp";
                     break;
                 case ImgStyle.JPG:
                     FilterString = "JPG (*.jpg)|*.jpg";
                     break;
                 case ImgStyle.GIF:
                     FilterString = "GIF (*.gif)|*.gif";
                     break;
                 default:
                     break;
             }
             return FilterString ;
         }

     }
}

//源码都有详细注释﹐很容易的。调用方法如下﹕
//this.pictureBox1.Image=PictureControl.ShowImage((PictureControl.LoadImage(PictureControl.ImgStyle.JPG)).ImgArray).Image;
// this.pictureBox1.Image = PictureControl.LoadImage(PictureControl.ImgStyle.JPG).Image;