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Solved
Convert Generic list to data
Posted on 2013-01-08
I am getting an error when I try to use a data class to retrieve data that I store in a list
it says Cannot implicitly convert type 'System.Collections.Generi
This is message data
it says Cannot implicitly convert type 'System.Collections.Generi
Data.Message m = new Data.Message();
Data.MessageData md = m.GetEditThread(ID);
//List<Data.MessageData> md = new List<Data.MessageData>();
//List<Data.MessageData> md = m.GetEditThread(ID);
lblPostID.Text = md.id;
radtxtBody = md.Body;
radtxtSubject = md.Subject;
This is message data
public class MessageData
{
public MessageData()
{
}
public int id { get; set; }
public string Subject { get; set; }
public string Body { get; set;}
public int File_Id {get; set;}
public bool ForPublic {get;set;}
public bool ForPrivate {get;set;}
public bool ForKKOnly {get;set;}
public int UserID {get;set;}
public int PriorityID {get;set;}
}
class Message
{
public List<MessageData> GetEditThread(int ID)
{
List<MessageData> list = new List<MessageData>();
string sql;
sql = "Select id,Subject, Body,File_Id,ForPublic,ForKKOnly, ForPrivate,UserID,PriorityID FROM MsgPost Where id = '" + ID + "'";
using (SqlConnection conn = new SqlConnection(DBConnectionString.Get(Database.Task)))
{
SqlCommand cmd = new SqlCommand(sql, conn);
cmd.CommandType = System.Data.CommandType.Text;
conn.Open();
SqlDataReaderHelper reader = new SqlDataReaderHelper(cmd.ExecuteReader());
if (reader.IsValid)
{
while (reader.Read())
{
list.Add(new MessageData()
{
ID = reader.GetInt("ID", 0),
Subject = reader.GetString("Subject", ""),
Body = reader.GetString("Body", ""),
File_Id = reader.GetInt("File_Id", 0),
ForPublic = reader.GetBool("ForPublic", false),
ForPrivate = reader.GetBool("ForPrivate", false),
ForKKOnly = reader.GetBool("ForKKOnly", false),
UserID = reader.GetInt("UserID", 0),
PriorityID = reader.GetInt("PriorityID", 0),
});
}
}
conn.Close();
}
return list;
}
}
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13 Comments
Active 6 days ago
try
List<Data.MessageData> md = new List<Data.MessageData>();
md.AddRange = m.GetEditThread(ID);
List<Data.MessageData> md = new List<Data.MessageData>(m.GetEditThread(ID));
Active today
A list contains none, one or many individual items.
It is like a shelf with numbers of books on it - you don't read the shelf, you take one book away and read that.
You take an item out of the list and process that item.
It is like a shelf with numbers of books on it - you don't read the shelf, you take one book away and read that.
You take an item out of the list and process that item.
Active 6 days ago
my mistake;
md.AddRange(m.GetEditThread(ID));
//or
List<Data.MessageData> md = new List<Data.MessageData>(m.GetEditThread(ID));
does not contain a definition for subject
Data.Message m = new Data.Message();
List<Data.MessageData> md = new List<Data.MessageData>(m.GetEditThread(ID));
lblPostID.Text = Convert.ToString(md.id);
radtxtBody.Text = md.Body;
radtxtSubject.Text = md.Subject;
Active today
?
What has that got to do with your original error when you attempted to cast a list of items to an individual item
What has that got to do with your original error when you attempted to cast a list of items to an individual item
Active 6 days ago
you are using a List, you must use items, not the LIST in self
Data.Message m = new Data.Message();
List<Data.MessageData> md = new List<Data.MessageData>(m.GetEditThread(ID));
if (md.Count > 0)
{
lblPostID.Text = Convert.ToString(md[0].id);
radtxtBody.Text = md[0].Body;
radtxtSubject.Text = md[0].Subject;
}
that means the suggested solution didnt work - I was doing that all day long - and to be honest Andy I dont need analogies or a life lesson in coding or someone with the mentality that they are a guru - II come here for actual help - Crashman was kiind enough to offer - you are not
IMHO
R
IMHO
R
Active today
Before you criticise you should read my comment.
I told you EXACTLY why your original code failed AND what to do to correct it.
I told you EXACTLY why your original code failed AND what to do to correct it.
Active 6 days ago
Your first problem was this...
So, for fill list you can use:
it says Cannot implicitly convert type 'System.Collections.GeneriThe second problem is different, because, one thing is how fill, and another is problem using the object in self. in this case, the items.c.List<Mes sageBoard. Data.Messa geData>' to 'MessageBoard.Data.Message Data
So, for fill list you can use:
List.AddRange(otherList)
//or in the instance
List<x> listX = new List<x>(otherList);
listX[0]
listX[1]
@Andy
no you told me about a bookshelf
@Crashman
Worked perfect - now I realize its alot like a dataset - thank you
no you told me about a bookshelf
@Crashman
Worked perfect - now I realize its alot like a dataset - thank you
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