（转载）DataTable与List<T>相互转换

 using System;
 using System.Collections.Generic;
 using System.ComponentModel;
 using System.Data;
 using System.Linq;
 using System.Reflection;
 using System.Text;
 using System.Threading.Tasks;
 
 namespace Common
 {
     public class ModelHelper
     {
         public static List<T> TableToEntity<T>(DataTable dt) where T : new()
         {
             List<T> lists = new List<T>();
             if (dt.Rows.Count > )
             {
                 foreach (DataRow row in dt.Rows)
                 {
                     lists.Add(SetVal(new T(), row));
                 }
             }
             return lists;
         }
 
         public static T SetVal<T>(T entity, DataRow row) where T : new()
         {
             Type type = typeof(T);
             PropertyInfo[] pi = type.GetProperties();
             foreach (PropertyInfo item in pi)
             {
                 if (row[item.Name] != null && row[item.Name] != DBNull.Value)
                 {
                     if (item.PropertyType.IsGenericType && item.PropertyType.GetGenericTypeDefinition().Equals(typeof(Nullable<>)))
                     {
                         Type conversionType = item.PropertyType;
                         NullableConverter nullableConverter = new NullableConverter(conversionType);
                         conversionType = nullableConverter.UnderlyingType;
                         item.SetValue(entity, Convert.ChangeType(row[item.Name], conversionType), null);
                     }
                     else
                     {
                         item.SetValue(entity, Convert.ChangeType(row[item.Name], item.PropertyType), null);
                     }
                 }
             }
             return entity;
         }
 
         public static DataTable EntityToDataTable<T>(List<T> list) where T : new()
         {
             if (list == null || list.Count == )
             {
                 return null;
             }
 
             DataTable dataTable = new DataTable(typeof(T).Name);
             foreach (PropertyInfo propertyInfo in typeof(T).GetProperties())
             {
                 if (propertyInfo.PropertyType.IsGenericType && propertyInfo.PropertyType.GetGenericTypeDefinition().Equals(typeof(Nullable<>)))
                 {
                     Type conversionType = propertyInfo.PropertyType;
                     NullableConverter nullableConverter = new NullableConverter(conversionType);
                     conversionType = nullableConverter.UnderlyingType;
                     dataTable.Columns.Add(new DataColumn(propertyInfo.Name, conversionType));
                 }
                 else
                 {
                     dataTable.Columns.Add(new DataColumn(propertyInfo.Name, propertyInfo.PropertyType));
                 }
             }
 
             foreach (T model in list)
             {
                 DataRow dataRow = dataTable.NewRow();
                 foreach (PropertyInfo propertyInfo in typeof(T).GetProperties())
                 {
                     object value = propertyInfo.GetValue(model, null);
                     if (value != null)
                     {
                         dataRow[propertyInfo.Name] = propertyInfo.GetValue(model, null);
                     }
                     else
                     {
                         dataRow[propertyInfo.Name] = DBNull.Value;
                     }
                 }
                 dataTable.Rows.Add(dataRow);
             }
             return dataTable;
         }
     }
 }