Elight.Utility/Core/ConvertHelper.cs

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Linq;
using System.Reflection;
using System.Text;

namespace Elight.Utility.Core
{
    /// <summary>
    /// 处理数据类型转换，数制转换、编码转换相关的类
    /// </summary>   
    public static class ConvertHelper
    {
        public static DataTable ToDataTable<T>(this List<T> data)
        {
            PropertyDescriptorCollection properties = TypeDescriptor.GetProperties(typeof(T));
            DataTable dataTable = new DataTable();
            for (int i = 0; i < properties.Count; i++)
            {
                PropertyDescriptor property = properties[i];
                dataTable.Columns.Add(property.Name, Nullable.GetUnderlyingType(property.PropertyType) ?? property.PropertyType);
            }
            object[] values = new object[properties.Count];
            foreach (T item in data)
            {
                for (int i = 0; i < values.Length; i++)
                {
                    values[i] = properties[i].GetValue(item);
                }
                dataTable.Rows.Add(values);
            }
            return dataTable;
        }

        public static List<T> ToList<T>(this DataTable table)
        {
            if (table == null)
            {
                return null;
            }
            List<DataRow> rows = new List<DataRow>();
            foreach (DataRow row in table.Rows)
            {
                rows.Add(row);
            }
            return rows.ToList<T>();
        }

        public static List<T> ToList<T>(this List<DataRow> rows)
        {
            List<T> list = null;
            if (rows != null)
            {
                list = new List<T>();

                foreach (DataRow row in rows)
                {
                    T item = row.ToObject<T>();