.Net中List<T> 泛型转成DataTable、DataSet-白红宇

.Net中List<T> 泛型转成DataTable、DataSet

阅读量：5927 次

发布时间：2019-06-19

本文共 3346 字，大约阅读时间需要 11 分钟。

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：

///         /// List
      
       转换成DataTable          /// 
      
        /// 
             ///         /// 集合数据        /// 
     
      返回DataTable
             public static System.Data.DataTable ToDataTable
     
      (this System.Collections.Generic.IList
      
        list, System.Collections.Generic.IList
       
         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：

///         /// List
      
       转换成DataSet          /// 
      
        /// 
             ///         /// 集合数据        /// 
     
      返回DataSet
             public static System.Data.DataSet ToDataSet
     
      (this System.Collections.Generic.IList
      
        list, System.Collections.Generic.IList
       
         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;        }