Question

I have some function like

private static UserInfo FillUserInfoFromDataRow(DataRow dr)
{

     UserInfo user = new UserInfo();

     user.UserID = (int) dr["UserID"];
     user.UserName = (int) dr["UserName"];
     user.ProjectID = (int) dr["ProjectID"];
     user.ClassID = (int) dr["ClassID"];
     ..............

     return user;
}

I’d like to write some generic function like
private static T FillEntityInfoFromDataRow(DataRow dr), that will treat analogous types ProjectInfo, JobInfo, etc.

I can get all columns names of the DataRow parameter, but I don’t know how to get all the appropriate fields of the generic T type and how to do appropriate casting.
Is it some way to do this job?
Thanks!

Ilan.

Answer 1

Its better to make use of reflection there are no of example avaible on google to do this this.

Check the below example

namespace MyNamespace.Data
{
    class Converter
    {
        public static void Fill(object LogicObject, DataRow Row)
        {
            Dictionary<string, PropertyInfo> props = new Dictionary<string,PropertyInfo>();
            foreach (PropertyInfo p in LogicObject.GetType().GetProperties())
                props.Add(p.Name, p);
            foreach (DataColumn col in Row.Table.Columns)
            {
                string name = col.ColumnName;
                if (Row[name] != DBNull.Value && props.ContainsKey(name))
                {
                    object item = Row[name];
                    PropertyInfo p = props[name];
                    if (p.PropertyType != col.DataType)
                        item = Convert.ChangeType(item, p.PropertyType);
                    p.SetValue(LogicObject, item, null);
                }
            }

        }
    }
}

Check the full blog post : http://kasey-jo.blogspot.com/2009/04/using-reflection-to-fill-business-layer.html