完美解决方案,可排除DATASET不支持System.Nullable错误

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Data;

using System.Reflection;

using YTO.WeiXin.Model;

using System.Collections;

namespace YTO.WeiXin.Core

{

    public class ListToDataTable

    {

        public static DataTable ToDataTable<T>(IList<T> list)

        {

            return ToDataTable(list, null);

        }

        //将list转换成DataTable

        public static DataTable ToDataTable<T>(IList<T> list, params string[] propertyName)

        {

            List<string> propertyNameList = new List<string>();

            if (propertyName != null)

            {

                propertyNameList.AddRange(propertyName);

            }

            DataTable result = new DataTable();

            if (list.Count > )

            {

                PropertyInfo[] propertys = list[].GetType().GetProperties();

                foreach (PropertyInfo pi in propertys)

                {

                    if (propertyNameList.Count == )

                    {

                        //if (DBNull.Value.Equals(pi.PropertyType))

                        //{

                        //   // pi.PropertyType = DateTime;

                        //}

                        Type colType = pi.PropertyType;

                        if (colType.IsGenericType && colType.GetGenericTypeDefinition() == typeof(Nullable<>))

                        {

                            colType = colType.GetGenericArguments()[0];

                        }

                        result.Columns.Add(pi.Name,colType);

                        //result.Columns.Add(pi.Name, pi.PropertyType);

                    }

                    else

                    {

                        if (propertyNameList.Contains(pi.Name))

                        {

                            result.Columns.Add(pi.Name, pi.PropertyType);

                        }

                    }

                }

                for (int i = ; i < list.Count; i++)

                {

                    ArrayList tempList = new ArrayList();

                    foreach (PropertyInfo pi in propertys)

                    {

                        if (propertyNameList.Count == )

                        {

                            object obj = pi.GetValue(list[i], null);

                            tempList.Add(obj);

                        }

                        else

                        {

                            if (propertyNameList.Contains(pi.Name))

                            {

                                object obj = pi.GetValue(list[i], null);

                                tempList.Add(obj);

                            }

                        }

                    }

                    object[] array = tempList.ToArray();

                    result.LoadDataRow(array, true);

                }

            }

            return result;

        }