我看过很多关于这个 ASP.NET 错误的帖子，但我无法弄清楚它如何应用于我的代码。
该页面在我的开发机器上加载没有任何错误。我只在我的生产机器上得到错误。
[Exception: An item with the same key has already been added.]
bli_main.Page_Load(Object sender, EventArgs e) in c:\inetpub\wwwroot\bli_main.master.cs:149
System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +25
System.Web.UI.Control.LoadRecursive() +71
System.Web.UI.Control.LoadRecursive() +190
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3064
它说错误的根源在第 149 行，这是我的 Page_Load 函数的右括号所在的行。
这是给出错误的页面的完整源代码。
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using MySql.Data.MySqlClient;
using System.Text.RegularExpressions;
using System.Web.Script.Serialization;
using System.Net;
using System.Configuration;
public partial class bli_main : System.Web.UI.MasterPage
{
public static string connectionString = ConfigurationSettings.AppSettings["connectionString"];
string sql;
//poll variables
List<string> poll_ids = new List<string>();
List<string> poll_long_descriptions = new List<string>();
List<string> poll_short_descriptions = new List<string>();
List<List<string>> questions = new List<List<string>>();
List<List<int>> questionTypes = new List<List<int>>();
List<List<int>> questionIDs = new List<List<int>>();
List<List<string>> responses = new List<List<string>>();
Dictionary<string, List<string>> d_questions = new Dictionary<string, List<string>>();
Dictionary<string, List<int>> d_questionTypes = new Dictionary<string, List<int>>();
Dictionary<string, List<int>> d_questionIDs = new Dictionary<string, List<int>>();
Dictionary<string, List<string>> d_responses = new Dictionary<string, List<string>>();
protected void Page_Load(object sender, EventArgs e)
{
MySqlConnection connector = new MySqlConnection(connectionString);
MySqlCommand command;
MySqlDataReader reader;
TableRow columnsRow = new TableRow();
Table1.Rows.Add(columnsRow);
columnsRow.VerticalAlign = VerticalAlign.Top;
connector.Open();
//pull table columns from database
sql = "SELECT * FROM column_table WHERE column_page_key = @page";
command = new MySqlCommand(sql, connector);
command.Parameters.AddWithValue("@page", pageNumber.Value);
command.CommandTimeout = 30000;
reader = command.ExecuteReader();
try
{
while (reader.Read())
{
TableCell c = new TableCell();
columnsRow.Cells.Add(c);
c.BorderWidth = 1;
c.ID = "column_" + reader["column_id"].ToString();
if (reader["column_type_key"].ToString().Equals("1"))
c.Width = 600;
if (reader["column_type_key"].ToString().Equals("2"))
c.Width = 250;
}
}
catch (Exception ex)
{
reader.Close();
connector.Close();
throw new Exception(ex.Message);
}
finally
{
reader.Close();
connector.Close();
}
//for each column, pull all widgets and load them in, and make an add-widget button
foreach (TableCell c in columnsRow.Cells)
{
string column_id = (c.ID.Split('_'))[1];
sql = "SELECT * FROM widget_instance_table, widget_instance_content_table "
+ "WHERE widget_instance_column_key=@column AND widget_instance_id=widget_instance_content_widget_instance_key";
connector.Open();
command = new MySqlCommand(sql, connector);
command.Parameters.AddWithValue("@column", column_id);
reader = command.ExecuteReader();
try
{
//for each widget in the column
while (reader.Read())
{
Table t = new Table();
t.BorderWidth = 1;
c.Controls.Add(t);
TableCell cc;
string widgetType = reader["widget_instance_content_type_key"].ToString();
//if it's an article widget
if (widgetType.Equals("7")) buildArticleWidget(t, reader["widget_instance_content_content_key"].ToString());
//if it's a tweet widget
else if (widgetType.Equals("13")) buildTweetWidget(t);
//if it's a poll widget
else if (widgetType.Equals("12")) buildPollWidget(t, reader["widget_instance_id"].ToString());
//if it's a testimonial widget
else if (widgetType.Equals("4")) buildTestimonialWidget(t, reader["widget_instance_id"].ToString());
//if it's a standard content widget
else if (widgetType.Equals("1")) buildStandardContentWidget(t, reader["widget_instance_id"].ToString());
//otherwise
else
{
t = new Table();
t.BorderWidth = 1;
TableRow r = new TableRow();
cc = new TableCell();
c.Controls.Add(t);
t.Rows.Add(r);
r.Cells.Add(cc);
cc.Text = "Other widget type goes Here";
}
}
}
catch (Exception ex)
{
reader.Close();
connector.Close();
throw new Exception(ex.Message);
}
finally
{
reader.Close();
connector.Close();
}
}
}
protected void buildTestimonialWidget(Table t, string widget_id)
{
TableRow r;
TableCell c;
t.BorderWidth = 1;
r = new TableRow();
c = new TableCell();
t.Rows.Add(r);
r.Cells.Add(c);
c.Text = "Testimonial " + widget_id + " goes here.";
MySqlConnection dataConn = new MySqlConnection(); ;
dataConn.ConnectionString = connectionString;
dataConn.Open();
//get widget configuration info from database
string sql = "SELECT * from content_table, widget_instance_content_table "
+ "WHERE widget_instance_content_content_key = cont_id "
+ "AND widget_instance_content_widget_instance_key = @widget_id";
MySqlCommand dataCmd = new MySqlCommand(sql, dataConn);
dataCmd.Parameters.AddWithValue("@widget_id", widget_id);
MySqlDataReader dataReader = dataCmd.ExecuteReader();
string article_title = "";
string article_content = "";
try
{
if (dataReader.Read())
{
article_title = dataReader["cont_desc"].ToString();
article_content = dataReader["cont_content_1"].ToString();
}
}
catch (Exception ex)
{
dataReader.Close();
dataConn.Close();
throw new Exception(ex.Message);
}
finally
{
dataReader.Close();
dataConn.Close();
}
r = new TableRow();
t.Rows.Add(r);
c = new TableCell();
r.Cells.Add(c);
c.Text = article_title;
r = new TableRow();
t.Rows.Add(r);
c = new TableCell();
r.Cells.Add(c);
c.Text = article_content;
c.Text = HttpUtility.HtmlDecode(c.Text);
Regex.Replace(c.Text, "<.*?>", string.Empty);
}
protected void buildStandardContentWidget(Table t, string widget_id)
{
TableRow r;
TableCell c;
t.BorderWidth = 1;
r = new TableRow();
c = new TableCell();
t.Rows.Add(r);
r.Cells.Add(c);
c.Text = "Standard Content " + widget_id + " goes here.";
MySqlConnection dataConn = new MySqlConnection(); ;
dataConn.ConnectionString = connectionString;
dataConn.Open();
//get widget configuration info from database
string sql = "SELECT * from content_table, widget_instance_content_table "
+ "WHERE widget_instance_content_content_key = cont_id "
+ "AND widget_instance_content_widget_instance_key = @widget_id";
MySqlCommand dataCmd = new MySqlCommand(sql, dataConn);
dataCmd.Parameters.AddWithValue("@widget_id", widget_id);
MySqlDataReader dataReader = dataCmd.ExecuteReader();
string article_title = "";
string article_content = "";
try
{
if (dataReader.Read())
{
article_title = dataReader["cont_desc"].ToString();
article_content = dataReader["cont_content_1"].ToString();
}
}
catch (Exception ex)
{
dataReader.Close();
dataConn.Close();
throw new Exception(ex.Message);
}
finally
{
dataReader.Close();
dataConn.Close();
}
r = new TableRow();
t.Rows.Add(r);
c = new TableCell();
r.Cells.Add(c);
c.Text = article_title;
r = new TableRow();
t.Rows.Add(r);
c = new TableCell();
r.Cells.Add(c);
c.Text = article_content;
c.Text = HttpUtility.HtmlDecode(c.Text);
Regex.Replace(c.Text, "<.*?>", string.Empty);
}
protected void buildPollWidget(Table t, string widget_id)
{
MySqlConnection dataConn;
MySqlCommand dataCmd;
MySqlDataReader dataReader;
//get the poll key of the poll from the widget instance table
dataConn = new MySqlConnection();
dataConn.ConnectionString = connectionString;
dataConn.Open();
sql = "SELECT widget_instance_content_content_key from widget_instance_content_table where widget_instance_content_widget_instance_key=@widget_id";
dataCmd = new MySqlCommand(sql, dataConn);
dataCmd.Parameters.AddWithValue("@widget_id", widget_id);
dataReader = dataCmd.ExecuteReader();
string poll;
try
{
dataReader.Read();
poll = dataReader[0].ToString();
}
catch (Exception ex)
{
dataReader.Close();
dataConn.Close();
throw new Exception(ex.Message);
}
finally
{
dataReader.Close();
dataConn.Close();
}
//get the long and short descriptions of the poll
//get the elements of the poll from the element table
dataConn = new MySqlConnection();
dataConn.ConnectionString = connectionString;
dataConn.Open();
sql = "SELECT * FROM poll_table WHERE poll_id=@poll";
dataCmd = new MySqlCommand(sql, dataConn);
dataCmd.Parameters.AddWithValue("@poll", poll);
dataReader = dataCmd.ExecuteReader();
string poll_long_desc;
string poll_short_desc;
try
{
dataReader.Read();
poll_long_desc = dataReader["poll_long_desc"].ToString();
poll_short_desc = dataReader["poll_short_desc"].ToString();
}
catch (Exception ex)
{
dataReader.Close();
dataConn.Close();
throw new Exception(ex.Message);
}
finally
{
dataReader.Close();
dataConn.Close();
}
//get the elements of the poll from the element table
dataConn = new MySqlConnection(); ;
dataConn.ConnectionString = connectionString;
dataConn.Open();
sql = "SELECT * FROM poll_element_table WHERE poll_table_key=@poll";
dataCmd = new MySqlCommand(sql, dataConn);
dataCmd.Parameters.AddWithValue("@poll", poll);
dataReader = dataCmd.ExecuteReader();
List<string> qs = new List<string>();
List<int> qtypes = new List<int>();
List<int> qids = new List<int>();
List<string> ans = new List<string>();
try
{
while (dataReader.Read())
{
qs.Add(dataReader["poll_element_question"].ToString());
qtypes.Add(Int32.Parse(dataReader["poll_element_type_key"].ToString()));
qids.Add(Int32.Parse(dataReader["poll_element_id"].ToString()));
ans.Add("");
}
}
catch (Exception ex)
{
dataReader.Close();
dataConn.Close();
throw new Exception(ex.Message);
}
finally
{
dataReader.Close();
dataConn.Close();
}
questions.Add(qs);
questionTypes.Add(qtypes);
questionIDs.Add(qids);
responses.Add(ans);
d_questions.Add(widget_id, qs);
d_questionTypes.Add(widget_id, qtypes);
d_questionIDs.Add(widget_id, qids);
d_responses.Add(widget_id, ans);
TableRow r;
TableCell c;
Button b;
//for each poll
//display poll descriptions
r = new TableRow();
r.CssClass = "bodysan";
t.Rows.Add(r);
c = new TableCell();
c.ColumnSpan = 2;
c.CssClass = "bodysan";
r.Cells.Add(c);
c.Text = poll_short_desc;
r = new TableRow();
t.Rows.Add(r);
c = new TableCell();
c.CssClass = "bodysan";
c.ColumnSpan = 2;
r.Cells.Add(c);
c.Text = poll_long_desc;
//display the questions and response fields
for (int j = 0; j < d_questions[widget_id].Count; j++)
{
r = new TableRow();
r.CssClass = "bodysan";
t.Rows.Add(r);
c = new TableCell();
c.CssClass = "bodysan";
r.Cells.Add(c);
c = new TableCell();
c.CssClass = "bodysan";
r.Cells.Add(c);
c.Text = d_questions[widget_id][j];
//c.Text = questions[0][j];
r = new TableRow();
r.CssClass = "bodysan";
t.Rows.Add(r);
int type = d_questionTypes[widget_id][j];
c = new TableCell();
c.CssClass = "bodysan";
r.Cells.Add(c);
r.Cells.Add(makeResponseCell(type, Int32.Parse(widget_id), j));
}
r = new TableRow();
r.CssClass = "bodysan";
t.Rows.Add(r);
c = new TableCell();
c.CssClass = "bodysan";
r.Cells.Add(c);
b = new Button();
b.CssClass = "bodysan";
c.Controls.Add(b);
b.Text = "Submit Poll";
b.ID = "submit_" + widget_id + "_poll";
b.Click += new EventHandler(this.submit);
}
//stores responses in database.
public void submit(Object sender, EventArgs e)
{
bool valid = true;
//get the poll ID.
Button b = (Button)sender;
string poll = b.ID.Split('_')[1];
//for each repsonse in this poll
for (int i = 0; i < d_responses[poll].Count; i++)
{
Table tb = (Table)b.Parent.Parent.Parent;
TableCell c = tb.Rows[2 * i + 3].Cells[1];
int type = d_questionTypes[poll][i];
string text = "";
if (type == 1)
{
//throw new Exception("i=" + i + ", cellControls=" + c.Controls.Count + ", cellText=" + c.Text);
TextBox t = (TextBox)c.Controls[0];
text = t.Text;
t.Text = "";
}
if (type == 2)
{
RadioButtonList r = (RadioButtonList)c.Controls[0];
text = r.Text;
r.ClearSelection();
}
if (type == 3)
{
RadioButtonList r = (RadioButtonList)c.Controls[0];
text = r.Text;
r.ClearSelection();
}
int element_id = d_questionIDs[poll][i];
string response = text;
//TODO: Update client ID from -1 to real client ID after login is implemented
int client_id = -1;
//responses[poll][i] = text;
MySqlConnection dataConn;
MySqlCommand dataCmd;
dataConn = new MySqlConnection();
dataConn.ConnectionString = connectionString;
dataConn.Open();
try
{
sql = "INSERT INTO poll_response_table "
+ "(poll_response_client_key, poll_response_poll_element_key, poll_response_response) "
+ "VALUES (@client_id, @element_id, @response)";
dataCmd = new MySqlCommand(sql, dataConn);
dataCmd.Parameters.AddWithValue("@client_id", client_id);
dataCmd.Parameters.AddWithValue("@element_id", element_id);
dataCmd.Parameters.AddWithValue("@response", response);
dataCmd.ExecuteNonQuery();
}
catch (Exception ex)
{
dataConn.Close();
throw new Exception(ex.Message);
}
finally
{
dataConn.Close();
}
}
/*
Response.Write("<table><tr><td>");
foreach (string s in responses[poll])
Response.Write(s + "<br/>");
foreach (List<string> l in responses)
{
Response.Write("----- <br/>");
foreach(string s in l)
Response.Write("- " + s + " <br/>");
}
Response.Write("</td></tr></table>");
*/
}
protected TableCell makeResponseCell(int type, int poll, int element)
{
TableCell c = new TableCell();
RadioButtonList r;
TextBox t;
switch (type)
{
//freeform textbox
case 1:
t = new TextBox();
c.Controls.Add(new TextBox());
break;
//yes/no
case 2:
r = new RadioButtonList();
r.RepeatDirection = RepeatDirection.Horizontal;
c.Controls.Add(r);
r.Items.Add("yes");
r.Items.Add("no");
break;
//1-5
case 3:
r = new RadioButtonList();
r.RepeatDirection = RepeatDirection.Horizontal;
c.Controls.Add(r);
r.Items.Add("1");
r.Items.Add("2");
r.Items.Add("3");
r.Items.Add("4");
r.Items.Add("5");
break;
//default = textbox
default:
c.Controls.Add(new TextBox());
break;
}
c.ID = poll + "_" + element + "_response";
return c;
}
protected void buildArticleWidget(Table t, string article_id)
{
TableRow r;
TableCell c;
t.BorderWidth = 1;
r = new TableRow();
c = new TableCell();
t.Rows.Add(r);
r.Cells.Add(c);
c.Text = "Article " + article_id + " goes here.";
MySqlConnection dataConn = new MySqlConnection(); ;
dataConn.ConnectionString = connectionString;
dataConn.Open();
//get widget configuration info from database
string sql = "SELECT * from content_table WHERE cont_id=@cont_id";
MySqlCommand dataCmd = new MySqlCommand(sql, dataConn);
dataCmd.Parameters.AddWithValue("@cont_id", article_id);
MySqlDataReader dataReader = dataCmd.ExecuteReader();
string article_title = "";
string article_content = "";
try
{
if (dataReader.Read())
{
article_title = dataReader["cont_desc"].ToString();
article_content = dataReader["cont_content_1"].ToString();
}
}
catch (Exception ex)
{
dataReader.Close();
dataConn.Close();
throw new Exception(ex.Message);
}
finally
{
dataReader.Close();
dataConn.Close();
}
r = new TableRow();
t.Rows.Add(r);
c = new TableCell();
r.Cells.Add(c);
c.Text = article_title;
r = new TableRow();
t.Rows.Add(r);
c = new TableCell();
r.Cells.Add(c);
c.Text = article_content;
c.Text = HttpUtility.HtmlDecode(c.Text);
Regex.Replace(c.Text, "<.*?>", string.Empty);
}
protected void buildTweetWidget(Table t)
{
MySqlConnection dataConn = new MySqlConnection(connectionString);
dataConn.Open();
//get widget configuration info from database
string sql = "SELECT * from widget_config WHERE widgcon_id=2";
MySqlCommand dataCmd = new MySqlCommand(sql, dataConn);
MySqlDataReader dataReader = dataCmd.ExecuteReader();
int num_tweets_displayed;
string account;
try
{
dataReader.Read();
num_tweets_displayed = (int)(dataReader["widgcon_num_items_displayed"]);
account = dataReader["widgcon_currently_displayed"].ToString();
}
catch (Exception ex)
{
dataReader.Close();
dataConn.Close();
throw new Exception(ex.Message);
}
finally
{
dataReader.Close();
dataConn.Close();
}
string tweets = ("<br/>");
foreach (var tweet in GetTweets(account).Take(num_tweets_displayed))
{
string s = Regex.Replace(HttpUtility.HtmlEncode(tweet), @"[a-z]+://[^\s]+",
x => "<a href='" + x.Value.Replace("'", """) + "' style='tweet_link'>" + x.Value + "</a>",
RegexOptions.Compiled | RegexOptions.IgnoreCase);
tweets += (s + "<br/><br/>");
}
TableRow r = new TableRow();
TableCell c = new TableCell();
c.Text = "Tweet Widget";
t.Rows.Add(r);
r.Cells.Add(c);
r = new TableRow();
c = new TableCell();
t.Rows.Add(r);
r.Cells.Add(c);
c.Text = tweets;
}
// called by buildTweetWidget
public List<string> GetTweets(string account)
{
var ls = new List<string>();
var jss = new JavaScriptSerializer();
try
{
var d = jss.Deserialize<List<Dictionary<string, object>>>(
new WebClient()
.DownloadString("http://api.twitter.com/1/statuses/user_timeline.json?screen_name=" + account));
foreach (var x in d)
ls.Add((string)x["text"]);
}
catch
{
ls.Add("Unauthorized.");
}
return ls;
}
}
我一直在寻找重复的变量名，但没有找到。如果之前已经回答过这个问题，我深表歉意。提前致谢！