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嗨朋友们，我已将图像插入 Sql Server，我需要将图像从 SQL Server 2008 R2 检索到 C# [Windows 应用程序] 中的 Datagridview 列。是否有可能在 Data Grid View 中显示图像是一列中的任何相应大小网格视图。

我将图像插入 SQL Server 的编码是：

  public void saveImageInDataBase(int imageid)
    {

        byte[] imagedata = ReadImageFile(txt_upload.Text);
        SqlConnection sqlconn = new SqlConnection();
        sqlconn.ConnectionString = "Data Source=.;Initial Catalog=db_payroll;Integrated Security=True;";
        sqlconn.Open();
        string query = "insert into tbl_image values('"+imagedata+"')";
        MessageBox.Show(query);
        SqlCommand cmd = new SqlCommand(query, sqlconn);
        int rows = cmd.ExecuteNonQuery();
        if (rows > 0)
        {
            MessageBox.Show("Image saved.");
            txt_upload.Text = "";
            pictureBox1.Image = null;
        }
        else
        {
            MessageBox.Show("Unable to save image.");
            sqlconn.Close();
        }
    }

    public byte[] ReadImageFile(string imageLocation)
    {
        byte[] imageData = null;
        FileInfo fileInfo = new FileInfo(imageLocation);
        long imageFileLength = fileInfo.Length;
        FileStream fs = new FileStream(imageLocation, FileMode.Open, FileAccess.Read);
        BinaryReader br = new BinaryReader(fs);
        imageData = br.ReadBytes((int)imageFileLength);
        return imageData;
    }

请尝试解决此问题。谢谢

4

1 回答 1

4

存储到数据库（在数据库中，imagedata列必须具有IMAGE数据类型）

    string query = "insert into tbl_image values(@imagedata)";
    SqlCommand cmd = new SqlCommand(query, sqlconn);
    cmd.Parameters.Add("@imagedata", System.Data.SqlDbType.Image);
    cmd.Parameters["@imagedata"].Value = imagedata;
    int rows = cmd.ExecuteNonQuery();

从数据库中检索

    string query = "select imagedata from tbl_image where ID=@ID";
    SqlCommand cmd = new SqlCommand(query, sqlconn);
    cmd.Parameters.AddWithValue("@id", id);
    byte[] imagedata=(byte[])cmdSelect.ExecuteScalar();
于 2013-02-16T14:01:58.003 回答