list和datable转换发生错误
0
[待解决问题]
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Collections;
using System.Reflection;
public partial class Default2 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
List<object> listS = new List<object>();
listS.Add("aa");
listS.Add("bb");
listS.Add("cc");
listS.Add("dd");
GridView1.DataSource = ToDataTable(listS);
GridView1.DataBind();
}
public static DataTable ToDataTable(IList list)
{
DataTable result = new DataTable();
if (list.Count > 0)
{
PropertyInfo[] propertys = list[0].GetType().GetProperties();
foreach (PropertyInfo pi in propertys)
{
result.Columns.Add(pi.Name, pi.PropertyType);
}
for (int i = 0; i < list.Count; i++)
{
ArrayList tem = new ArrayList();
foreach (PropertyInfo pi in propertys)
{
object obj = pi.GetValue( list[i], null);
tem.Add(obj);
}
object[] array = tem.ToArray();
result.LoadDataRow(array, true);
}
}
return result;
}
}
谁知道怎么搞定
所有回答(2)
0
把错误信息贴出来啊。
那张图片就是啊
@码农一号wwg: 看不清…
@码农一号wwg: 我已经解决了，，谢谢了啊
0
/// <summary>
/// 将泛类型集合List类转换成DataTable
/// </summary>
/// <param name="list">泛类型集合</param>
/// <returns></returns>
public static DataTable ListToDataTable<T>(List<T> entitys)
{
//检查实体集合不能为空
if (entitys == null || entitys.Count < 1)
{
throw new Exception("需转换的集合为空");
}
//取出第一个实体的所有Propertie
Type entityType = entitys[0].GetType();
PropertyInfo[] entityProperties = entityType.GetProperties();
//生成DataTable的structure
//生产代码中，应将生成的DataTable结构Cache起来，此处略
DataTable dt = new DataTable();
for (int i = 0; i < entityProperties.Length; i++)
{
//dt.Columns.Add(entityProperties[i].Name, entityProperties[i].PropertyType);
dt.Columns.Add(entityProperties[i].Name);
}
//将所有entity添加到DataTable中
foreach (object entity in entitys)
{
//检查所有的的实体都为同一类型
if (entity.GetType() != entityType)
{
throw new Exception("要转换的集合元素类型不一致");
}
object[] entityValues = new object[entityProperties.Length];
for (int i = 0; i < entityProperties.Length; i++)
{
entityValues[i] = entityProperties[i].GetValue(entity, null);
}
dt.Rows.Add(entityValues);
}
return dt;
}