用asp.net写的论坛程序--浏览贴及回复

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2) reply.aspx : The topic viewing and replying page

<%@ Page Language="C#" EnableSessionState="False" Debug="True" %>
<%@ Import Namespace="System" %>
<%@ Assembly %>
<%@ Import Namespace="System.Data" %>
<%@ Import Namespace="System.Data.ADO" %>
<html><head>
<title>Post New Topic.</title>
<%-- These are the imported assemblies and namespaces needed --%>
<script Language="C#" runat="server">
DataSet ds ,rs;
DataRow dr ;
string postid ;
public void Page_Load(object sender , EventArgs e)
{
//Check if the page is Post Back
if(!Page.IsPostBack)
{
//Get the postid from the Query string
postid = Request.Params["postid"] ;
if(postid!=null)
{
//Database connection string. Change the path to the database file if you have some other path where
//you are saving your Database file
string strConn=@"Provider=Microsoft.Jet.OLEDB.4.0 ;Data Source="+Server.MapPath(".\\db\\board.mdb") ;
//Make a connection to the Database
ADOConnection myConn = new ADOConnection(strConn) ;
//string to select the records from the newpost table
string strCon ="SELECT subject, name, email, message ,date FROM newpost WHERE postid="+postid ;
//set a ADODataSetCommand
ADODataSetCommand myCommand =new ADODataSetCommand(strCon,myConn);
ds = new DataSet();
//Don't ever forget to open the Connection
myConn.Open();
//Fill the DataSet
myCommand.FillDataSet(ds,"newpost") ;
//Get the Row at position '0' and store it in a DataRow object
//Why row at position '0' ? Since there can only be one record with the given postid remember !!
//Why put into a DataRow ? Its easy to access data from a DataRow
dr = ds.Tables["newpost"].Rows[0] ;
//Get the "subject" from the DataRow and set it up in the post reply form's subject field
subject.Text="Re:"+dr["subject"].ToString() ;
//Select the replies to the post from the reply table
strCon ="SELECT name , email, subject, message ,date FROM reply WHERE postid="+postid ;
//Make a new ADODataSetCommand and DataSet for the reply table
ADODataSetCommand myCommand2 =new ADODataSetCommand(strCon,myConn);
rs = new DataSet() ;
//fill the DataSet
myCommand2.FillDataSet(rs, "reply") ;
//Code to update the "views" field for the newpost Table
//Select the views field from the table for a given postid
strCon ="SELECT views FROM newpost WHERE postid = "+postid ;
//Make a ADOCommand here since we want a ADODataReader later
ADOCommand vicomm = new ADOCommand(strCon, myConn) ;
ADODataReader reader ;
//execute the statement and create a ADODataReader
vicomm.Execute(out reader) ;
//Read the First record (there can only be one record remember !)
reader.Read() ;
//Get a "Int32" value from the first Column (we have one column in the reader, check the select statement above)
int i = reader.GetInt32(0) ;
//Increase the views count
i++ ;
reader.Close() ;
//Update the newpost table with the new views value
strCon ="UPDATE newpost SET views = "+i+" WHERE (postid= "+postid+")" ;
//since we are using the same ADOCOmmand object for this statement too to set the CommandText property
vicomm.CommandText = strCon ;
//Since this statement will result in no output we use "ExecuteNonQuery()" method
vicomm.ExecuteNonQuery() ;
//close the connection
myConn.Close();
}
}
}
// This method is called when the submit button is clicked
public void Submit_Click(Object sender, EventArgs e)
{
//Get the postid
postid = Request.Params["postid"] ;

//proceed only if all the required fields are filled-in
if(Page.IsValid&&name.Text!=""&&subject.Text!=""&&email.Text!=""){
DateTime now = DateTime.Now ;
errmess.Text="" ;
//We have to call the postmessage.aspx page with a query to post the data to the Database.
//Hence we have to first build the custom query from the Data posted by the user
//also since we are using a query we have to encode the data into UTF8 format
string req = "name="+ System.Web.HttpUtility.UrlEncodeToString(name.Text, System.Text.Encoding.UTF8);
req+="&&email="+ System.Web.HttpUtility.UrlEncodeToString(email.Text, System.Text.Encoding.UTF8);
req+="&&subject="+System.Web.HttpUtility.UrlEncodeToString(subject.Text, System.Text.Encoding.UTF8);
req+="&&ip="+System.Web.HttpUtility.UrlEncodeToString(Request.UserHostAddress.ToString(), System.Text.Encoding.UTF8);
req+="&&date="+ System.Web.HttpUtility.UrlEncodeToString(now.ToString(), System.Text.Encoding.UTF8);
req+="&&message="+ System.Web.HttpUtility.UrlEncodeToString(message.Text, System.Text.Encoding.UTF8);
//Encode "no" to indicate that the post is not a new post but its a reply to a earlier message
req+="&&newpost="+ System.Web.HttpUtility.UrlEncodeToString("no", System.Text.Encoding.UTF8);
req+="&&previd="+ System.Web.HttpUtility.UrlEncodeToString(postid, System.Text.Encoding.UTF8);
//Call the postmessage page with our custom query
Page.Navigate("postmessage.aspx?" + req);
}
else
{
errmess.Text="Fill in all the Required Fields !" ;
}
}
</script>
<LINK href="mystyle.css" type=text/css rel=stylesheet></head>
<body topmargin="0" leftmargin="0" rightmargin="0" marginwidth="0" marginheight="0">
<%-- Include a header file 'header.inc' --%>

<br>
<div align=center>
<table border=0 width=80% cellspacing=2>
<tr class=fohead><th width=20%>Author Name</th>
<th width=80%>Message</th></tr>
<%-- Below I am encapsulating the email of the author over the name of the author
so that when you click on the author a e-mail gets sent to him
Also I am geting the DateTime from the DataBase and Displaying the Date and Time separately --%>
<tr class=folight><td rowspan=2><%= "<a href=mailto:"+dr["email"]+">"+dr["name"]+"</a>" %><br>
<font size=1><%= dr["date"].ToString().ToDateTime().ToShortDateString() %><br>
<%= dr["date"].ToString().ToDateTime().ToShortTimeString() %></font>
</td>
<td><b>Subject: </b><%=dr["subject"] %></td></tr>
<tr class=folight>
<td><pre><%=dr["message"] %></pre> </td>
</tr>
<%-- Get all the replies to the Original post and show them --%>
<% int no = rs.Tables["reply"].Rows.Count ;
if(no>0)
{
for(int j=0 ;j<no ; j++)
{
DataRow rd = rs.Tables["reply"].Rows[j] ;
%>
<tr class=fodark>
<td><%="<a href=mailto:"+rd["email"]+">"+rd["name"]+"</a>" %><br>
<font size=1><%= rd["date"].ToString().ToDateTime().ToShortDateString() %><br>
<%= rd["date"].ToString().ToDateTime().ToShortTimeString() %></font>
</td>
<td><pre><%=rd["message"] %></pre> </td>
</tr>
<%
}
}
%>
</table>
</div>
<h3><a href=forum.aspx>Click Here</a> to go to back to Forum.
<br>Reply to the Above Post.</h3>
<br>
<asp:label text="" runat="server" />
<form runat="server">
<table>
<tr >
<td colspan=2><b>Reply to the Post</b></td>
</tr>
<tr >
<td>Name :</td>
<td ><asp:textbox text="" runat="server" />   <font color=#ff0000>*</font></td>
</tr>
<tr>
<td>E-Mail :</td>
<td><asp:textbox text="" runat="server"/>   <font color=#ff0000>*</font></td>
</tr>
<tr>
<td> Subject:</td>
<td><asp:textbox test="" width=200 runat="server"/>   <font color=#ff0000>*</font>
</td></tr>
<tr>
<td>Message :</td>
<td>
<asp:TextBox id=message runat="server"
Columns="30" Rows="15" TextMode="MultiLine"></asp:TextBox></td>
</tr>
<tr class=folight>
<td colspan=2>
<asp:Button class=fodark id=write onClick=Submit_Click runat="server" Text="Submit"></asp:Button></td></tr>
</table>
</form><br>
<br>
</body></html>

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