DataTableHelper

using System;
using System.Collections.Generic;
using System.Data;
using System.ComponentModel;
using System.Reflection;
using System.Globalization;

namespace FmallExternal.Helper
{
    /// 

    /// DataTable转Model帮助类
    /// 
    public static class DataTableHelper
    {
        /// 

        /// Model转DataTable
        /// 
        public static DataTable ConvertTo(IList list)
        {
            using (DataTable table = CreateTable())
            {
                Type entityType = typeof(T);
                PropertyDescriptorCollection properties = TypeDescriptor.GetProperties(entityType);
                if (list != null)
                {
                    foreach (T item in list)
                    {
                        DataRow row = table.NewRow();
                        foreach (PropertyDescriptor prop in properties)
                            row[prop.Name] = prop.GetValue(item);
                        table.Rows.Add(row);
                    }
                }
                return table;
            }
        }
        /// 

        /// DataRow的List转Model的List
        /// 
        public static IList ConvertTo(IList rows)
        {
            IList list = null;
            if (rows != null)
            {
                list = new List();
                foreach (DataRow row in rows)
                {
                    T item = CreateItem(row);
                    list.Add(item);
                }
            }
            return list;
        }
        /// 

        /// DataTable转Model的List
        /// 
        public static IList ConvertTo(DataTable table)
        {
            if (table == null)
                return null;
            List rows = new List();
            foreach (DataRow row in table.Rows)
                rows.Add(row);
            return ConvertTo(rows);
        }
        /// 

        /// DataRow转Model
        /// 
        public static T CreateItem(DataRow row)
        {
            T obj;
            if (row != null)
            {
                Type entityType = typeof(T);
                PropertyDescriptorCollection properties = TypeDescriptor.GetProperties(entityType);
                obj = Activator.CreateInstance();
                foreach (DataColumn column in row.Table.Columns)
                {
                    string columnName = column.ColumnName;
                    var propitem = properties.Find(columnName, true);
                    if (propitem == null) continue;
                    PropertyInfo prop = obj.GetType().GetProperty(propitem.Name);
                    if (!prop.CanWrite) continue;
                    object value = (row[columnName].GetType() == typeof(DBNull)) ? null : row[columnName];
                    if (value == null) continue;

                    if (prop.PropertyType.Equals(typeof(Boolean)))
                    {
                        prop.SetValue(obj, (value ?? "0").ToString().Equals("1"));
                    }
                    else if (prop.PropertyType.IsGenericType && prop.PropertyType.GetGenericTypeDefinition() == typeof(Nullable<>))
                    {
                        prop.SetValue(obj, Convert.ChangeType(value, prop.PropertyType.GetGenericArguments()[0], CultureInfo.CurrentCulture));
                    }
                    else
                    {
                        prop.SetValue(obj, Convert.ChangeType(value, prop.PropertyType, CultureInfo.CurrentCulture));
                    }
                }
            }
            else
            {
                obj = default(T);
            }
            return obj;
        }
        /// 

        /// 根据Model创建一个空的DataTable
        /// 
        private static DataTable CreateTable()
        {
            Type entityType = typeof(T);
            using (DataTable table = new DataTable(entityType.Name))
            {
                table.Locale = CultureInfo.InvariantCulture;
                PropertyDescriptorCollection properties = TypeDescriptor.GetProperties(entityType);
                foreach (PropertyDescriptor prop in properties)
                    table.Columns.Add(prop.Name, prop.PropertyType);
                return table;
            }
        }
    }
}