Hi,
I am new to ASP.NET and I am trying to build a CMS application using theBeerHouse SK.
I am adapting the Datareader to collect information from an SQL database and send it to an HtmlHeader. Using N-Tier architecture I keep recieving an object reference required error.
Here's my code:
Home.aspx.cs - namespace TMG.DAL
-
{
-
public partial class Home : System.Web.UI.Page
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{
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public HeaderDetails findInfo(string pageId)
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{
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HeaderDetails headers = null;
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headers = GetHeader.GetHeaderById(pageId);
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return headers;
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}
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protected void Page_Load(object sender, EventArgs e)
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{
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String pageId = Page.GetType().Name;
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pageId = pageId.Replace("_aspx", "");
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Master.Page.Header.Title = "TMG - Advertisers site - " + pageId;
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//Get the htmlHead your aspx page is using (from the Master page)
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//Master page must include the runat server attribute in the head tag: <head runat="server">
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HtmlHead head = (System.Web.UI.HtmlControls.HtmlHead)Header;
-
-
//Create a htmlMeta object
-
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HtmlMeta meta = new HtmlMeta();
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HtmlMeta meta2 = new HtmlMeta();
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HtmlMeta meta3 = new HtmlMeta();
-
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//Specify meta attributes
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meta.Attributes.Add("name", "keywords");
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meta.Attributes.Add("content", "blah");
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meta2.Attributes.Add("name", "description");
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meta2.Attributes.Add("content", "blah");
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meta3.Attributes.Add("name", "abstract");
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meta3.Attributes.Add("content", "blah");
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// Add the meta object to the htmlhead's control collection
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head.Controls.Add(meta);
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head.Controls.Add(meta2);
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head.Controls.Add(meta3);
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}
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}
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}
-
-
HeaderProvider.cs
-
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namespace TMG.DAL
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{
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public abstract class HeaderProvider : DataAccess
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{
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//public abstract HeaderDetails GetHeaderByID(string pageId);
-
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protected virtual HeaderDetails GetHeaderFromReader(IDataReader reader)
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{
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return GetHeaderFromReader(reader, true);
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}
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protected virtual HeaderDetails GetHeaderFromReader(IDataReader reader, bool readBody)
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{
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HeaderDetails headers = new HeaderDetails(
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(int)reader["id"],
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null,
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null,
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null,
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reader["javascript"].ToString(),
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reader["title"].ToString(),
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reader["css"].ToString(),
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reader["page_id"].ToString());
-
-
if (readBody)
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headers.AbstractText = reader["abstractText"].ToString();
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headers.Description = reader["description"].ToString();
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headers.Keywords = reader["keywords"].ToString();
-
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return headers;
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}
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}
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}
-
-
HeaderDetails.cs
-
-
namespace TMG.DAL
-
{
-
public class HeaderDetails
-
{
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public HeaderDetails(int id, string abstractText, string description, string keywords, string javascript, string title, string css, string page_id)
-
{
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this.ID = id;
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this.AbstractText = abstractText;
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this.Description = description;
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this.Keywords = keywords;
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this.Javascript = javascript;
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this.Title = title;
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this.Css = css;
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this.PageId = page_id;
-
-
-
}
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private int _id = 0;
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public int ID
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{
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get { return _id; }
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set { _id = value; }
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}
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private string _abstractText = "";
-
public string AbstractText
-
{
-
get { return _abstractText; }
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set { _abstractText = value; }
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}
-
private string _description = "";
-
public string Description
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{
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get { return _description; }
-
set { _description = value; }
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}
-
private string _keywords = "";
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public string Keywords
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{
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get { return _keywords; }
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set { _keywords = value; }
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}
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private string _javascript = "";
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public string Javascript
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{
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get { return _javascript; }
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set { _javascript = value; }
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}
-
private string _title = "";
-
public string Title
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{
-
get { return _title; }
-
set { _title = value; }
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}
-
private string _css = "";
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public string Css
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{
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get { return _css; }
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set { _css = value; }
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}
-
private string _pageId = "";
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public string PageId
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{
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get { return _pageId; }
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set { _pageId = value; }
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}
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}
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}
-
-
GetHeader.cs
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namespace TMG.DAL
-
{
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public class GetHeader : HeaderProvider
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{
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private int _id = 0;
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public int ID
-
{
-
get { return _id; }
-
set { _id = value; }
-
}
-
private string _abstractText = "";
-
public string AbstractText
-
{
-
get { return _abstractText; }
-
set { _abstractText = value; }
-
}
-
private string _description = "";
-
public string Description
-
{
-
get { return _description; }
-
set { _description = value; }
-
}
-
private string _keywords = "";
-
public string Keywords
-
{
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get { return _keywords; }
-
set { _keywords = value; }
-
}
-
private string _javascript = "";
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public string Javascript
-
{
-
get { return _javascript; }
-
set { _javascript = value; }
-
}
-
private string _title = "";
-
public string Title
-
{
-
get { return _title; }
-
set { _title = value; }
-
}
-
private string _css = "";
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public string Css
-
{
-
get { return _css; }
-
set { _css = value; }
-
}
-
private string _pageId = "";
-
public string PageId
-
{
-
get { return _pageId; }
-
set { _pageId = value; }
-
}
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public GetHeader(int id, string abstractText, string description, string keywords, string javascript, string title, string css, string page_id)
-
{
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this.ID = id;
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this.AbstractText = abstractText;
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this.Description = description;
-
this.Keywords = keywords;
-
this.Javascript = javascript;
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this.Title = title;
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this.Css = css;
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this.PageId = page_id;
-
-
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}
-
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public virtual HeaderDetails GetHeaderById(string pageId)
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{
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SqlConnection cn = GetConnection();
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SqlCommand oCommand = new SqlCommand("page_header",cn);
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oCommand.CommandType=CommandType.StoredProcedure; // Parametrs
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oCommand.Parameters.Add("@pageId", SqlDbType.VarChar).Value = pageId;
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cn.Open();
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IDataReader reader = ExecuteReader(oCommand, CommandBehavior.SingleRow);
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if (reader.Read())
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return GetHeaderFromReader(reader, true);
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else
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return null;
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}
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}
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}
-
-
DataAccess.cs
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namespace TMG.DAL
-
{
-
public abstract class DataAccess
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{
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protected static string strConnect;
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public DataAccess()
-
{
-
}
-
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static DataAccess()
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{
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strConnect = ConfigurationManager.AppSettings["connstr"];
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}
-
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protected SqlConnection GetConnection()
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{
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SqlConnection oConnection = new SqlConnection(strConnect);
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return oConnection;
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}
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protected IDataReader ExecuteReader(DbCommand cmd)
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{
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return ExecuteReader(cmd, CommandBehavior.Default);
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}
-
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protected IDataReader ExecuteReader(DbCommand cmd, CommandBehavior behavior)
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{
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return cmd.ExecuteReader(behavior);
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}
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protected object ExecuteScalar(DbCommand cmd)
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{
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return cmd.ExecuteScalar();
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}
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}
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}
Sorry for all the code.
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