Question

我有一个List＆lt;＆gt;对象（对象是自定义实体类）和我有一个DataTable，其中的列与实体类的属性相匹配。

有没有办法可以将带有List的数据项复制到DataTable，而无需遍历List并手动将数据添加到DataTable。

以下是我当前代码的示例（C＃4.0）：

    void MergeData()
    {
        List<MyEntity> myEntities = GetEntities();

        // Create a DataTable based on the Properties of the MyEntity class
        Type entity = typeof(MyEntity);
        PropertyInfo[] properties = entity.GetProperties();
        DataTable dt = new DataTable();
        foreach (PropertyInfo pi in properties)
        {
            dt.Columns.Add(pi.Name);
        }

        // Here's where I loop through the List and fill the DataTable. 
        // Is there a way to fill the DataTable without looping through the List?    
        foreach (MyEntity e in myEntities)
        {
            DataRow dr = dt.NewRow();
            foreach (PropertyInfo pi in properties)
            {
                dr[pi.Name] = pi.GetValue(e, null);
            }
            dt.Rows.Add(dr);
        }
    }

通常，列表＆lt;＆gt;将有大约27k项目，所以我只是好奇是否有更清洁和/或更优化的方式从我的列表中获取数据＆lt;＆gt;进入DataTable。

Answer 1

如何让您的实体能够填充可以添加到数据表中的数据行。这样就减少了反射的使用。

Answer 2

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

/// <summary>
/// Summary description for UserBO
/// </summary>
public class UserBO
{
    public UserBO()
    {
        //
        // TODO: Add constructor logic here
        //
    }
    private string _mUserName;

    public string UserName
    {
        get { return _mUserName; }
        set { _mUserName = value; }
    }
    private string _mPassword;

    public string Password
    {
        get { return _mPassword; }
        set { _mPassword = value; }
    }
    private int _mUserID;

    public int UserID
    {
        get { return _mUserID; }
        set { _mUserID = value; }
    }
}

 IList<UserBO> objlistUserBo = new List<UserBO>();
 objlistUserBo = objUserFacade.Getuserinfo(objUSerBO);

            for (int iterator=0; iterator < objlistUserBo.Count; iterator++)
            {
                objUSerBO = (UserBO)objlistUserBo[iterator];
                string name = objUSerBO.UserName;
                string pwd = objUSerBO.Password;
            }

将数据从List <myentity>复制到DataTable对象</myentity>

2 个答案: