C# List<T>转成DataTable

        //将List<T>转成DataTable
        public static DataTable ToDataTable(List<T> collection)
        {
            var props = typeof(T).GetProperties();
            var dt = new DataTable();
            dt.Columns.AddRange(props.Select(p => new DataColumn(p.Name, p.PropertyType)).ToArray());
            if (collection.Count() > 0)
            {
                for (int i = 0; i < collection.Count(); i++)
                {
                    ArrayList tempList = new ArrayList();
                    foreach (PropertyInfo pi in props)
                    {
                        object obj = pi.GetValue(collection.ElementAt(i), null);
                        tempList.Add(obj);
                    }
                    object[] array = tempList.ToArray();
                    dt.LoadDataRow(array, true);
                }
            }
            return dt;
        }

public static class Extension
    {
        public static DataTable ListToDataTable<T>(this IList<T> data, string tableName)
        {
            DataTable table = new DataTable(tableName);

            //special handling for value types and string
            if (typeof(T).IsValueType || typeof(T).Equals(typeof(string)))
            {

                DataColumn dc = new DataColumn("Value");
                table.Columns.Add(dc);
                foreach (T item in data)
                {
                    DataRow dr = table.NewRow();
                    dr[0] = item;
                    table.Rows.Add(dr);
                }
            }
            else
            {
                PropertyDescriptorCollection properties = TypeDescriptor.GetProperties(typeof(T));
                foreach (PropertyDescriptor prop in properties)
                {
                    table.Columns.Add(prop.Name,
                    Nullable.GetUnderlyingType(prop.PropertyType) ?? prop.PropertyType);
                }
                foreach (T item in data)
                {
                    DataRow row = table.NewRow();
                    foreach (PropertyDescriptor prop in properties)
                    {
                        try
                        {
                            row[prop.Name] = prop.GetValue(item) ?? DBNull.Value;
                        }
                        catch (Exception ex)
                        {
                            row[prop.Name] = DBNull.Value;
                        }
                    }
                    table.Rows.Add(row);
                }
            }
            return table;
        }
    }