Go Premium for a chance to win a PS4. Enter to Win

x
?
Solved

Cast List<Object> to List<MyClass>

Posted on 2013-05-28
4
Medium Priority
?
780 Views
Last Modified: 2013-05-28
Hi,

I have to write an ADO.Net Context, and rather than repetitively setting properties for each object, I decided to have a function that is passed an object as a template, opens a reader, then iterates through the properties of the object, setting them to the corresponding reader value.

This works absolutely great, however I'm not sure how to cast the returned List<object> to List<MyClass>

Here's the code:

Convert to List
public static List<object> ConvertToList(string SQL, Dictionary<string, dynamic> Parameters, string ConnectionString, object template)
        {
            SqlConnection conn = new SqlConnection(ConnectionString);
            IDbCommand cmd = conn.CreateCommand();
            List<object> ReturnList = new List<object>();
            Type convertType = template.GetType();
            DataTable dt = new DataTable();

            conn.Open();

            cmd.CommandText = SQL;
            cmd.CommandType = CommandType.StoredProcedure;


            //add parameters
            if (Parameters != null)
            {
                foreach (KeyValuePair<string, dynamic> prop in Parameters)
                {
                    IDataParameter param = cmd.CreateParameter();
                    param.ParameterName = prop.Key;
                    param.Value = prop.Value;

                    cmd.Parameters.Add(param);
                }
            }

            IDataReader reader = cmd.ExecuteReader();

            //dt.Load(reader);

            while (reader.Read())
            {
                object obj = Activator.CreateInstance(convertType);

                foreach (PropertyInfo propInfo in convertType.GetProperties())
                {
                    if (propInfo.CanRead)
                    {
                        dynamic val = null;

                        if (propInfo.PropertyType == typeof(string))
                        {
                            val = reader[propInfo.Name].ToString();
                        }
                        else if (propInfo.PropertyType == typeof(int))
                        {
                            val = Convert.ToInt32(reader[propInfo.Name]);
                        }
                        else if (propInfo.PropertyType == typeof(bool))
                        {
                            val = Convert.ToBoolean(reader[propInfo.Name]);
                        }
                        else if (propInfo.PropertyType == typeof(decimal))
                        {
                            val = Convert.ToDecimal(reader[propInfo.Name]);
                        }
                        else if (propInfo.PropertyType == typeof(DateTime))
                        {
                            val = Convert.ToDateTime(reader[propInfo.Name]);
                        }
                        else if (propInfo.PropertyType == typeof(Guid))
                        {
                            val = (Guid)reader[propInfo.Name];
                        }
                        else
                        {
                            Console.WriteLine("here");
                        }

                        convertType.GetProperty(propInfo.Name).SetValue(obj, val, null);
                    }
                }

                ReturnList.Add(obj);
            }

            reader.Close();
            conn.Close();

            return ReturnList;
        }

Open in new window


Set to Defined List
List<User> u = Extensions.ConvertToList("spListUsers", parameters, ConnectionString, new User());
            

Open in new window


Set to Defined list is the bit that isn't working



I've tried several things, but none seem to work.  Any ideas?
0
Comment
Question by:krapvag
  • 3
4 Comments
 
LVL 42

Accepted Solution

by:
Meir Rivkin earned 2000 total points
ID: 39200950
using linq u can convert list of objects to list<MyClass> like the following:
List<MyClass> list = ReturnList.Select(n=>(MyClass)n).ToList();

Open in new window

0
 
LVL 1

Author Comment

by:krapvag
ID: 39200952
Never mind, I have fixed it

Here it is incase anyone is curious

List<User> users = u.Select(f => (User)f).ToList();

Open in new window

0
 
LVL 1

Author Comment

by:krapvag
ID: 39200955
I've requested that this question be closed as follows:

Accepted answer: 0 points for krapvag's comment #a39200952

for the following reason:

found solution myself
0
 
LVL 1

Author Closing Comment

by:krapvag
ID: 39200956
sorry, just saw this.  I will accept this answer
0

Featured Post

Hire Technology Freelancers with Gigs

Work with freelancers specializing in everything from database administration to programming, who have proven themselves as experts in their field. Hire the best, collaborate easily, pay securely, and get projects done right.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Many of us here at EE write code. Many of us write exceptional code; just as many of us write exception-prone code. As we all should know, exceptions are a mechanism for handling errors which are typically out of our control. From database errors, t…
For those of you who don't follow the news, or just happen to live under rocks, Microsoft Research released a beta SDK (http://www.microsoft.com/en-us/download/details.aspx?id=27876) for the Xbox 360 Kinect. If you don't know what a Kinect is (http:…
Despite its rising prevalence in the business world, "the cloud" is still misunderstood. Some companies still believe common misconceptions about lack of security in cloud solutions and many misuses of cloud storage options still occur every day. …
Screencast - Getting to Know the Pipeline
Suggested Courses

972 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question