.Net中ListT 泛型转成DataTable、DataSet

在开发过程过程中有时候需要将List<T>泛型转换成DataTable、DataSet，可以利用反射机制将DataTable的字段与自定义类型的公开属性互相赋值。

1、List<T>泛型转换成DataTable 代码：

        /// <summary>
        /// List<T>转换成DataTable  
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="list"></param>
        /// <param name="dataList">集合数据</param>
        /// <returns>返回DataTable</returns>
        public static System.Data.DataTable ToDataTable<T>(this System.Collections.Generic.IList<T> list, System.Collections.Generic.IList<T> dataList) where T : class ,new()
        {
            if (dataList == null || !dataList.Any())
            {
                return null;
            }
            Type type = typeof(T);
            System.Data.DataTable dt = new System.Data.DataTable(type.Name);
            System.Reflection.PropertyInfo[] propertyInfoArray = type.GetProperties(System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.Instance);
            foreach (T t in dataList.Where(t => t != null))
            {
                System.Data.DataRow row = dt.NewRow();
                for (int i = 0, j = propertyInfoArray.Length; i < j; i++)
                {
                    System.Reflection.PropertyInfo propertyInfo = propertyInfoArray[i];
                    string name = propertyInfo.Name;
                    if (dt.Columns[name] == null)
                    {
                        System.Data.DataColumn column = new System.Data.DataColumn(name, propertyInfo.PropertyType);
                        dt.Columns.Add(column);
                    }
                    row[name] = propertyInfo.GetValue(t, null);
                }
                dt.Rows.Add(row);
            }
            return dt;
        }

 

2、List<T>泛型转换成DataSet 代码：

         /// <summary>
        /// List<T>转换成DataSet  
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="list"></param>
        /// <param name="dataList">集合数据</param>
        /// <returns>返回DataSet</returns>
        public static System.Data.DataSet ToDataSet<T>(this System.Collections.Generic.IList<T> list, System.Collections.Generic.IList<T> dataList) where T : class ,new()
        {
            if (dataList == null || !dataList.Any())
            {
                return null;
            }
            Type type = typeof(T);
            System.Data.DataSet ds = new System.Data.DataSet();
            System.Data.DataTable dt = new System.Data.DataTable(type.Name);
            System.Reflection.PropertyInfo[] propertyInfoArray = type.GetProperties(System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.Instance);
            foreach (T t in dataList.Where(t => t != null))
            {
                System.Data.DataRow row = dt.NewRow();
                for (int i = 0, j = propertyInfoArray.Length; i < j; i++)
                {
                    System.Reflection.PropertyInfo propertyInfo = propertyInfoArray[i];
                    string name = propertyInfo.Name;
                    if (dt.Columns[name] == null)
                    {
                        System.Data.DataColumn column = new System.Data.DataColumn(name, propertyInfo.PropertyType);
                        dt.Columns.Add(column);
                    }
                    row[name] = propertyInfo.GetValue(t, null);
                }
                dt.Rows.Add(row);
            }
            ds.Tables.Add(dt);
            return ds;
        }