?
Solved

Cast List<Object> to List<MyClass>

Posted on 2013-05-28
4
Medium Priority
?
716 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
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
4 Comments
 
LVL 42

Accepted Solution

by:
sedgwick 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

Free Tool: Path Explorer

An intuitive utility to help find the CSS path to UI elements on a webpage. These paths are used frequently in a variety of front-end development and QA automation tasks.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Question has a verified solution.

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

A basic question.. “What is the Garbage Collector?” The usual answer given back: “Garbage collector is a background thread run by the CLR for freeing up the memory space used by the objects which are no longer used by the program.” I wondered …
This article describes relatively difficult and non-obvious issues that are likely to arise when creating COM class in Visual Studio and deploying it by professional MSI-authoring tools. It is assumed that the reader is already familiar with the cla…
Sometimes it takes a new vantage point, apart from our everyday security practices, to truly see our Active Directory (AD) vulnerabilities. We get used to implementing the same techniques and checking the same areas for a breach. This pattern can re…
In this video, Percona Solution Engineer Rick Golba discuss how (and why) you implement high availability in a database environment. To discuss how Percona Consulting can help with your design and architecture needs for your database and infrastr…
Suggested Courses

771 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