检索存储在SQL Server数据库中的PDF文件，然后在页面上显示

Question

我正在使用asp.net应用程序，它在页面上显示从数据库中检索到的pdf文件。我正面临着pdf文件未在页面中显示的问题

有了这个，我附上了我试过的代码：

        con.Open();

        SqlCommand cmd = new SqlCommand("select Pdf from SavePdf where IC='" + id +   
        "'", con);
        SqlDataReader dr = cmd.ExecuteReader();

        if (dr.Read())
        {
            byte[] fileData = (byte[])dr.GetValue(0);

            Response.Buffer = true;
            Response.Charset = "";
            Response.Cache.SetCacheability(HttpCacheability.NoCache);
            Response.ContentType = "application/pdf";
            Response.BinaryWrite(fileData);
            Response.Flush();
            Response.End();                   
        }
        dr.Close(); 
       }

Answer 1

使用此代码

protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            int id = int.Parse(Request.QueryString["id"]);
            Display(id);
        }
    }

    private void Display(int id)
    {
        DataSet ds = GetData("select * from tblFiles where Id=@Id", id);
        Byte[] bytes = (Byte[])ds.Tables[0].Rows[0]["Data"];
        Response.Buffer = true;
        Response.Charset = "";
        Response.Cache.SetCacheability(HttpCacheability.NoCache);
        Response.ContentType = "application/pdf";
        Response.BinaryWrite(bytes);
        Response.Flush();
        Response.End();
    }

    private DataSet GetData(string query, int id)
    {
        string conString = ConfigurationManager.ConnectionStrings["constr_files"].ConnectionString;
        SqlCommand cmd = new SqlCommand(query);
        using (SqlConnection con = new SqlConnection(conString))
        {
            using (SqlDataAdapter sda = new SqlDataAdapter())
            {
                cmd.Connection = con;
                cmd.Parameters.Add("@Id", id);
                sda.SelectCommand = cmd;
                using (DataSet ds = new DataSet())
                {
                    sda.Fill(ds);
                    return ds;
                }
            }
        }
    }

Answer 2

我尝试了你的代码，它对我来说很完美。

protected void ShowPdfButton_Click(object sender, EventArgs e)
    {

        byte[] fileData = GetPdfBytes(); 

        Response.Buffer = true;
        Response.Charset = "";
        Response.Clear();
        Response.Cache.SetCacheability(HttpCacheability.NoCache);
        Response.ContentType = "application/pdf";
        Response.BinaryWrite(fileData);
        Response.Flush();
        Response.End();  
    }

    private byte[] GetPdfBytes()
    {
        string pdfFileFullName = @"C:\Reports\Test.pdf";
        //TODO: you can fetch the bytes from database as well and return. i have used pdf file.
        return System.IO.File.ReadAllBytes(pdfFileFullName);
    }