检索varbinary数据c＃图片框

Question

嗨，大家我有我的代码有问题，我保存为varbinary图像确定，但我希望图像显示在一个图片框从fileupload中选择时，但我一直得到一个错误，这可能吗？我使用的是C＃和asp.net。我一直在寻找，但我似乎无法让我的源代码工作。

using System; 
using System.Data; 
using System.Data.SqlClient; 
using System.Linq; 
using System.Web.UI.WebControls; 
using System.IO; 
using System.Drawing; 

public partial class Mensagem : System.Web.UI.Page 
{   
    protected void BtnUploadClick(object sender, EventArgs e) 
    { 
     string filePath = Server.MapPath(upload1.FileName); 
     string filename = Path.GetFileName(filePath); 
     string ext = Path.GetExtension(upload1.PostedFile.FileName); 
     Stream fs = upload1.PostedFile.InputStream; 
     BinaryReader br = new BinaryReader(fs); 
     Byte[] bytes = br.ReadBytes((Int32)fs.Length); 
     string dt = DateTime.Now.ToString("MM/dd/yyyy hh:mm:ss");  

     SqlConnection conn = new SqlConnection("Data Source=Microsoft SQL Server (SqlClient);Server=NEVETS-LAPTOP\\NEVETS;Initial Catalog=Forum;uid=sa;pwd=sql;Connect Timeout=10;TrustServerCertificate=True "); 
       conn.Open(); 

      SqlCommand sqlCommand = conn.CreateCommand(); 
      sqlCommand.CommandType = CommandType.StoredProcedure; 
      sqlCommand.CommandText = "usp_inserirFicheiro";     
      sqlCommand.Parameters.AddWithValue("@nome", SqlDbType.VarChar).Value = filename; 
      sqlCommand.Parameters.AddWithValue("@tamanho", SqlDbType.VarBinary).Value = bytes; 
      sqlCommand.Parameters.AddWithValue("@formato", SqlDbType.VarChar).Value = ext; 
      sqlCommand.Parameters.AddWithValue("@data", SqlDbType.DateTime).Value = dt; 
      sqlCommand.Parameters.AddWithValue("@ficheiro", SqlDbType.VarBinary).Value = br;        
      sqlCommand.ExecuteNonQuery(); 
      txtnome.Text = "sucesso"; 

      conn.Close(); 

    } 


    protected void Button2_Click(object sender, EventArgs e) 
    { 
     //upload1.SaveAs(Server.MapPath("~/imgs/" + upload1.FileName).ToString()); 
     //pbficheiro.ImageUrl = @"~/imgs/" + upload1.FileName; 


Byte[] ba = new BinaryReader(upload1.PostedFile.InputStream).ReadBytes((Int32)upload1.PostedFile.InputStream.Length); 
using (MemoryStream ms = new MemoryStream(ba, false)) 
{ 
    Image imgTmp = Image.FromStream(ms); 
    Bitmap bm = new Bitmap(imgTmp.Width, imgTmp.Height); 
    Graphics g = Graphics.FromImage(bm); 
    g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; 
    g.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality; 
    g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; 
    Rectangle rect = new Rectangle(0, 0, imgTmp.Width, imgTmp.Height); 
    g.DrawImage(imgTmp, rect, 0, 0, imgTmp.Width, imgTmp.Height, GraphicsUnit.Pixel); 

    using (MemoryStream ms2 = new MemoryStream()) 
    { 
     bm.Save(ms2, imgTmp.RawFormat); 
      bm.Dispose(); 
      imgTmp.Dispose(); 
      if (WantAnImage) 
       return Image.FromStream(ms2); 
      else (WantBytes) 
       ms2.ToArray();} 
    } 
} 

} 

Answer 1

因为

的图像数据被设置成与流对象时此方法退出如果错误存储器相关的，则很可能。尝试将其捕获到中间位图对象中，并将该位图分配给PictureBox图像属性。

这里有一个链接，可以帮助：

http://msdn.microsoft.com/en-us/library/z7ha67kw

编辑：

我不

Saving Image to MemoryStream- Generic GDI+ Error

归根结底，这是作为一个信息源引用t知道什么类型的“upload1”是或其范围，但是荷兰国际集团是本地的对象，我想知道这个方法（这将是你会打电话来检索字节]或图像的方法）：

protected void Button2_Click(object sender, EventArgs e) 
{ 
    //upload1.SaveAs(Server.MapPath("~/imgs/" + upload1.FileName).ToString()); 
    //pbficheiro.ImageUrl = @"~/imgs/" + upload1.FileName; 

    Byte[] ba = new BinaryReader(upload1.PostedFile.InputStream).ReadBytes((Int32)upload1.PostedFile.InputStream.Length); 
    using (MemoryStream ms = new MemoryStream(ba, false)) 
    { 
     System.Drawing.Image imgTmp = System.Drawing.Image.FromStream(ms); 
     Bitmap bm = new Bitmap(imgTmp.Width, imgTmp.Height); 
     Graphics g = Graphics.FromImage(bm); 
     g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; 
     g.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality; 
     g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; 
     Rectangle rect = new Rectangle(0, 0, imgTmp.Width, imgTmp.Height); 
     g.DrawImage(imgTmp, rect, 0, 0, imgTmp.Width, imgTmp.Height, GraphicsUnit.Pixel); 
       bm.Save(Server.MapPath("~/imgs/" + upload1.FileName).ToString()); 
       pbficheiro.ImageUrl = @"~/imgs/" + upload1.FileName; 
    } 
}