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

Create procedure spGetImageById 
@ID int
as
Begin
Select ImgData
from images where ID=@ID
End

这是我在管理页面中的代码我写的用于保存数据库中的图像和超链接似乎可以在另一页中看到图像以确保它是正确的图像：

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

我写这篇文章是为了对imges进行评论：

    string cs = ConfigurationManager.ConnectionStrings["DBCS"].ConnectionString;
      using (SqlConnection con = new SqlConnection(cs))
     {
          SqlCommand cmd = new SqlCommand("spGetImageById", con);
         cmd.CommandType = CommandType.StoredProcedure;

        SqlParameter paramID = new SqlParameter()
        {
            ParameterName = "@ID",
            Value = Request.QueryString["ID"]
        };
        cmd.Parameters.Add(paramID);

        con.Open();
        cmd.ExecuteScalar();
        byte[] bytes = (byte[])cmd.ExecuteScalar();
        string strBase64 = Convert.ToBase64String(bytes);
        Image1.ImageUrl = "data:Image/png;base64," + strBase64;
        }

我想在img-tag的主页面中显示图像。所以我试图复制让你查看图像的代码到我的主页面，但它说：＆＃34;程序或功能＆＃39; spGetImageById＆＃39;期望参数＆＃39; @ ID＆＃39;，未提供＆＃34;。

Answer 1

请务必获取所有字节，尝试替换

string strBase64 = Convert.ToBase64String(bytes, 0, bytes.Length);

与

grep --perl-regexp \
  '\bv(?:\d{1,2}\.){2}\d{1,2}(?:\-\d{1,2})?(?:\-(?:schema|dev))?(?:\s|$)' \
  path/to/file

同样在单词Image：

上更改为小写

Image1.ImageUrl =＆＃34;数据：图片 / png; base64，＆＃34; + strBase64;

显示存储在数据库asp.net中的图像

1 个答案: