wpf 展示从sql server Image类型数据

wpf 展示sql server 中iamge类型数据

image数据是二进制数据，现有一个字段存储的是图片，我需要用wpf的image控件把图片展示出来

使用的是三层技术，首先定义模型层，image类型的数据在模型层中用byte[]表示

public class A
{
    public int Id { get; set; }
    public byte[] aa { get; set; }
}

之后定义数据访问层代码：,DBHelper就不展示了

public class ADAL
{
    public List<A> GetList(string where)
    {
        List<A> list = new List<A>();
        SqlDataReader reader = DBHelper.ExecuteReader("select * from a where 1=1 and " + where);
        while (reader.Read())
        {
            list.Add(new A()
            {
                Id = Convert.ToInt32(reader["id"]),
                Sxqm = reader["aa"].ToString() == "" ? null : (byte[])reader["aa"]
            });   
        }

        return list;
    }
}

定义完数据访问层后定义业务逻辑层代码：

public class AManager
 {
     private readonly ADAL dal = new ADAL();

     public A Get(string id,ref string e)
     {
         string where = $"id = '{id}'";
         try
         {
             return dal.GetList(where)[0];
         }
         catch (Exception exception)
         {
             e = exception.Message;
         }

         return null;
     }
 }

最后写ui，xaml中写：

<Image x:Name="Image"></Image>

后台代码:

AManager manager = new AManager();
string message = "";
A a = manager.Get("1", ref message);
this.DataContext = a;
if (a.aa != null)
{
    // 将byte[] 转换为 BitmapImage
    MemoryStream stream = new MemoryStream(a.aa);
    var image = new BitmapImage();
    image.BeginInit();
    image.CacheOption = BitmapCacheOption.OnLoad;
    image.StreamSource = stream;
    image.EndInit();
    image.Freeze();
    // 给Image绑定图片
    this.Image.Source = image;

}
if (message != "")
{
    MessageBox.Show(message);
}