convert List<DataRow> to List<UserEntity> in C#.

本文关键字：gt lt List in UserEntity DataRow convert to | 更新日期: 2023-09-27 18:01:21

我有一个类似UserEntity的类，如下所示

[Serializable]
[XmlRootAttribute(ElementName = "UsersEntity", IsNullable = false)]
public class UserEntity
{
    [XmlElement(DataType="string",ElementName="UsersID")]
    public int UsersID { get; set; }
    [XmlElement(DataType = "string", ElementName = "UserName")]
    public string UserName { get; set; }
    [XmlElement(DataType = "string", ElementName = "Password")]
    public string Password { get; set; }
}

然后我从Db表中填充一个记录作为数据集。然后不使用foreach循环，我将数据集转换为List，如下所示

Dataset _ods= new Dataset();  
//create a list of UerEntity class
List<UserEntity> lstUsers=new List<UserEntity>();
// populate record as dataset from DB table
_ods = populateEmpData();
// convert List<DataRow> from Dataset withou Foreach Loop
List<DataRow> lstRows = _ods.Tables[0].AsEnumerable().ToList();

现在我想通过使用ConvertAll方法将lstRows转换为List，如下所示:

  lstUsers=lstRows.ToList().ConvertAll(new Converter(ent=>ent));

但是它不起作用。我该怎么做呢?

convert List<DataRow> to List<UserEntity> in C#.

您需要手动将DataRow字段映射到UserEntity类的字段。像这样的代码应该可以工作(未经测试):

lstUsers = (from dr in lstRows
            select new UserEntity 
            {
                UsersId = dr.Field<int>("user_id"),
                UserName = dr.Field<string>("user_name"),
                Password = dr.Field<string>("password")
            }).ToList();

并且，事实上，您不需要lstrow，也不需要将lstUsers初始化为空列表:

var lstUsers = (from dr in _ods.Tables[0].AsEnumerable()
                select new UserEntity 
                {
                    UsersId = dr.Field<int>("user_id"),
                    UserName = dr.Field<string>("user_name"),
                    Password = dr.Field<string>("password")
                }).ToList();
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