C# List转DataSet

 static class Extensions
    {
        internal static DataSet ToDataSet<T>(this List<T> list)
        {
            Type elementType = typeof(T);
            var ds = new DataSet();
            var t = new DataTable();
            ds.Tables.Add(t);
            elementType.GetProperties().ToList().ForEach(propInfo => t.Columns.Add(propInfo.Name, Nullable.GetUnderlyingType(propInfo.PropertyType) ?? propInfo.PropertyType));
            foreach (T item in list)
            {
                var row = t.NewRow();
                elementType.GetProperties().ToList().ForEach(propInfo => row[propInfo.Name] = propInfo.GetValue(item, null) ?? DBNull.Value);
                t.Rows.Add(row);
            }
            return ds;
        }
    }