Question

这是我的数据库：

create table images 
(
     ID int primary key identity, 
     Name nvarchar(255),
     Size int, 
     ImgData varbinary(max) 
)

CREATE PROCEDURE UploadImages
     @Name nvarchar(255),
     @Size int,
     @ImgData varbinary(max),
     @NewId int output
AS
BEGIN
    INSERT INTO images
    VALUES (@Name, @Size, @ImgData)

    SELECT @NewId = SCOPE_IDENTITY()    
END

我想将数据库中的图像显示到标签中 - 我该如何在asp.net中执行此操作？

这是我的代码：

 HttpPostedFile PostedFile = FileUpload1.PostedFile;

 string fileName = Path.GetFileName(PostedFile.FileName);
 string fileExtension = Path.GetExtension(fileName);
 int fileSize = PostedFile.ContentLength;

 if(fileExtension.ToLower() == ".jpg" || fileExtension.ToLower() == ".bmp"|| fileExtension.ToLower() == ".gif" || fileExtension.ToLower() == ".png")
 {
     Stream stream = PostedFile.InputStream;
     BinaryReader binaryReader = new BinaryReader(stream);

     byte[] bytes = binaryReader.ReadBytes((int)stream.Length);

     string cs = ConfigurationManager.ConnectionStrings["DBCS"].ConnectionString;

     using (SqlConnection con = new SqlConnection(cs))
     {
         SqlCommand cmd = new SqlCommand("UploadImages", con);
         cmd.CommandType = CommandType.StoredProcedure;

         con.Open();

         SqlParameter paramName = new SqlParameter()
         {
             ParameterName = "@Name",
             Value = fileName
         };
         cmd.Parameters.Add(paramName);

         SqlParameter paramSize = new SqlParameter()
         {
             ParameterName = "@Size",
             Value = fileSize
         };
         cmd.Parameters.Add(paramSize);

         SqlParameter paramImgData = new SqlParameter()
         {
             ParameterName = "@ImgData",
             Value = bytes
         };
         cmd.Parameters.Add(paramImgData);

         SqlParameter paramNewId = new SqlParameter()
         {
             ParameterName = "@NewId",
             Value =-1,
             Direction = ParameterDirection.Output
         };
         cmd.Parameters.Add(paramNewId);

         cmd.ExecuteNonQuery();
         con.Close();

         Lmas.Visible = true;
         Lmas.Text = "done";
         Lmas.ForeColor = System.Drawing.Color.Green;
         HyperLink1.Visible = true;
         HyperLink1.NavigateUrl = "~/ShowImage.aspx?Id=" + cmd.Parameters["@NewId"].Value.ToString();

         //LoadImage();
     } 
 } 
 else 
 {
     Lmas.Visible = true;
     Lmas.Text = "only images (.jpg .png .gif .bmp) can be uploaded";
     Lmas.ForeColor = System.Drawing.Color.Red;
     HyperLink1.Visible = false;
 }

Answer 1

一个简单的解决方法是：

 <img id="img" runat="server" alt=""/> (instead of an label)

并在您的函数中

img.Src = "data:image/jpg;base64," + Convert.ToBase64String((byte[])datarow[0]);

我想在asp.net的标签中显示数据库中的图像

1 个答案: