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POput values from Inner join in object that is in an object
primarykey
Id
8201366
data
AcceptedAnswerId
8201379
AnswerCount
2
ClosedDate
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CommunityOwnedDate
CreationDate
2011-11-20T12:05:13.607
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2011-11-20T12:14:08.140
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2011-11-20T12:14:08.140
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1
Score
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ViewCount
104
LastEditorDisplayName
text
Body
I have the following sql command with an Inner join: <pre><code>SqlCommand cmd = new SqlCommand(@"SELECT c.comment_Id, c.date, c.comment, c.rating, a.registration_Date, a.username, a.email, a.profile_Image FROM News_comments c INNER JOIN News_accounts a ON c.account_Id=a.account_Id WHERE c.news_Id = @news_Id", conn); cmd.Parameters.Add("news_Id", SqlDbType.Int).Value = news_Id; conn.Open(); </code></pre> I want to put the values from a (News_accounts) in the object account that is in itself in the object newsComment which is located in a generic List, List newsComments. I do that like this: <pre><code>using (SqlDataReader reader = cmd.ExecuteReader()) { while (reader.Read()) { Comments newsComment = new Comments(); newsComment.comment_Id = int.Parse(reader["comment_Id"].ToString()); newsComment.date = DateTime.Parse(reader["date"].ToString()); newsComment.comment = reader["comment"].ToString(); newsComment.rating = int.Parse(reader["rating"].ToString()); newsComment.account.Registration_Date = DateTime.Parse(reader["registration_Date"].ToString()); newsComment.account.Username = reader["username"].ToString(); newsComment.account.Email = reader["email"].ToString(); newsComment.account.Profile_Image = reader["profile_Image"].ToString(); newsComments.Add(newsComment); } return newsComments; } </code></pre> Comments has a constructor: <pre><code>public Comments(int comment_Id, DateTime date, string comment, int rating, Accounts account) { this.comment_Id = comment_Id; this.date = date; this.comment = comment; this.rating = rating; this.account = account; } </code></pre> And Accounts account as well: <pre><code>public Accounts(int account_Id, DateTime registration_Date, string email, string username, string profile_Image, string homepage, string about, bool admin) { this.account_Id = account_Id; this.registration_Date = registration_Date; this.email = email; this.profile_Image = profile_Image; this.homepage = homepage; this.about = about; this.admin = admin; } </code></pre> Up until rating all goes well and the values are being put in the newsComment object, however, when it reaches the values that need to be put in the object account that is located in the object newsComment, it gives a NullReferenceException. I know this means that it doesn't have a value but I can't seem to find why it has no value. I've looked checked my Inner join with sql server 2008 query designer, and that works so it's got to be the object but I don't see the problem. please help me :) greetings
Tags
<c#><asp.net><inner-join><generic-list>
Title
put values from Inner join in object that is in an object
singulars
PostAcceptedAnswerId
1. PO
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PostParentId
1. This table or related slice is empty.
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1. PTQuestion
UserLastEditorUserId
1. USmarc_s
UserOwnerUserId
1. USreaper_unique
plurals
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1. This table or related slice is empty.
PostLinksRelatedPostIdPostId
1. This table or related slice is empty.
PostsAcceptedAnswerId
1. This table or related slice is empty.
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1. PO
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2. PO
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1. This table or related slice is empty.
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