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代码示例

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

namespace ToolClass
{
    /// <summary> ModelUtil 实体转换工具类 </summary>
    public class ModelUtil<T> where T : new()
    {
        /// <summary> Table转换成实体 </summary>
        /// <param name="dt"> 表 </param>
        /// <returns> </returns>
        public static 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();
                for (int i = 0; i < dr.Table.Columns.Count; i++)
                {
                    PropertyInfo propertyInfo = model.GetType().GetProperty(dr.Table.Columns[i].ColumnName);
                    if (propertyInfo != null && dr[i] != DBNull.Value)
                        propertyInfo.SetValue(model, dr[i], null);
                }

                modelList.Add(model);
            }
            return modelList;
        }

        /// <summary> 将Table中的一行数据转换成实体 </summary>
        /// <param name="dr"> Table中的一行数据 </param>
        /// <returns> </returns>
        public static T FillSigleMode(DataRow dr)
        {
            T model = new T();
            if (dr != null)
            {
                for (int i = 0; i < dr.Table.Columns.Count; i++)
                {
                    PropertyInfo propertyInfo = model.GetType().GetProperty(dr.Table.Columns[i].ColumnName);
                    if (propertyInfo != null && dr[i] != DBNull.Value)
                        propertyInfo.SetValue(model, dr[i], null);
                }
            }
            return model;
        }

        /// <summary> 实体类转换成DataTable </summary>
        /// <param name="modelList"> 实体类列表 </param>
        /// <returns> </returns>
        public static 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 static 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;
        }
    }
}