方法一

private static List<T> TableToEntity<T>(DataTable dt) where T : class,new() 
{ 
    Type type = typeof(T); 
    List<T> list = new List<T>(); 

    foreach (DataRow row in dt.Rows) 
    { 
        PropertyInfo[] pArray = type.GetProperties(); 
        T entity = new T(); 
        foreach (PropertyInfo p in pArray) 
        { 
            if (row[p.Name] is Int64) 
            { 
                p.SetValue(entity, Convert.ToInt32(row[p.Name]), null); 
                continue; 
            } 
            p.SetValue(entity, row[p.Name], null); 
        } 
        list.Add(entity); 
    } 
    return list; 
}

方法二

     public class ConvertHelper<T> where T : new()
    {
        /// <summary>  
        /// 利用反射和泛型  
        /// </summary>  
        /// <param name="dt"></param>  
        /// <returns></returns>  
        public static List<T> ConvertToList(DataTable dt)
        {

            // 定义集合  
            List<T> ts = new List<T>();

            // 获得此模型的类型  
            Type type = typeof(T);
            //定义一个临时变量  
            string tempName = string.Empty;
            //遍历DataTable中所有的数据行  
            foreach (DataRow dr in dt.Rows)
            {
                T t = new T();
                // 获得此模型的公共属性  
                PropertyInfo[] propertys = t.GetType().GetProperties();
                //遍历该对象的所有属性  
                foreach (PropertyInfo pi in propertys)
                {
                    tempName = pi.Name;//将属性名称赋值给临时变量  
                    //检查DataTable是否包含此列（列名==对象的属性名）    
                    if (dt.Columns.Contains(tempName))
                    {
                        // 判断此属性是否有Setter  
                        if (!pi.CanWrite) continue;//该属性不可写，直接跳出  
                        //取值  
                        object value = dr[tempName];
                        //如果非空，则赋给对象的属性  
                        if (value != DBNull.Value)
                            pi.SetValue(t, value, null);
                    }
                }
                //对象添加到泛型集合中  
                ts.Add(t);
            }

            return ts;

        }
    }

方法三

using System.Runtime.Serialization;

    /// <summary>
    /// DataTable与实体类互相转换
    /// </summary>
    /// <typeparam name="T">实体类</typeparam>
    public class ModelHandler<T> where T : new()
    {
        #region DataTable转换成实体类

        /// <summary>
        /// 填充对象列表：用DataSet的第一个表填充实体类
        /// </summary>
        /// <param name="ds">DataSet</param>
        /// <returns></returns>
        public List<T> FillModel(DataSet ds)
        {
            if (ds == null || ds.Tables[0] == null || ds.Tables[0].Rows.Count == 0)
            {
                return null;
            }
            else
            {
                return FillModel(ds.Tables[0]);
            }
        }

        /// <summary>  
        /// 填充对象列表：用DataSet的第index个表填充实体类
        /// </summary>  
        public List<T> FillModel(DataSet ds, int index)
        {
            if (ds == null || ds.Tables.Count <= index || ds.Tables[index].Rows.Count == 0)
            {
                return null;
            }
            else
            {
                return FillModel(ds.Tables[index]);
            }
        }

        /// <summary>  
        /// 填充对象列表：用DataTable填充实体类
        /// </summary>  
        public List<T> FillModel(DataTable dt)
        {
            if (dt == null || dt.Rows.Count == 0)
            {
                return null;
            }
            List<T> modelList = new List<T>();
            foreach (DataRow dr in dt.Rows)
            {
                //T model = (T)Activator.CreateInstance(typeof(T));  
                T model = new T();
                foreach (PropertyInfo propertyInfo in typeof(T).GetProperties())
                {
                    model.GetType().GetProperty(propertyInfo.Name).SetValue(model, dr[propertyInfo.Name], null);
                }
                modelList.Add(model);
            }
            return modelList;
        }

        /// <summary>  
        /// 填充对象：用DataRow填充实体类
        /// </summary>  
        public T FillModel(DataRow dr)
        {
            if (dr == null)
            {
                return default(T);
            }

            //T model = (T)Activator.CreateInstance(typeof(T));  
            T model = new T();
            foreach (PropertyInfo propertyInfo in typeof(T).GetProperties())
            {
                model.GetType().GetProperty(propertyInfo.Name).SetValue(model, dr[propertyInfo.Name], null);
            }
            return model;
        }

        #endregion

        #region 实体类转换成DataTable

        /// <summary>
        /// 实体类转换成DataSet
        /// </summary>
        /// <param name="modelList">实体类列表</param>
        /// <returns></returns>
        public DataSet FillDataSet(List<T> modelList)
        {
            if (modelList == null || modelList.Count == 0)
            {
                return null;
            }
            else
            {
                DataSet ds = new DataSet();
                ds.Tables.Add(FillDataTable(modelList));
                return ds;
            }
        }

        /// <summary>
        /// 实体类转换成DataTable
        /// </summary>
        /// <param name="modelList">实体类列表</param>
        /// <returns></returns>
        public DataTable FillDataTable(List<T> modelList)
        {
            if (modelList == null || modelList.Count == 0)
            {
                return null;
            }
            DataTable dt = CreateData(modelList[0]);

            foreach(T model in modelList)
            {
                DataRow dataRow = dt.NewRow();
                foreach (PropertyInfo propertyInfo in typeof(T).GetProperties())
                {
                    dataRow[propertyInfo.Name] = propertyInfo.GetValue(model, null);
                }
                dt.Rows.Add(dataRow);
            }
            return dt;
        }

        /// <summary>
        /// 根据实体类得到表结构
        /// </summary>
        /// <param name="model">实体类</param>
        /// <returns></returns>
        private DataTable CreateData(T model)
        {
            DataTable dataTable = new DataTable(typeof (T).Name);
            foreach (PropertyInfo propertyInfo in typeof(T).GetProperties())
            {
                dataTable.Columns.Add(new DataColumn(propertyInfo.Name, propertyInfo.PropertyType));
            }
            return dataTable;
        }

        #endregion
    }