Question

我在运行时创建动态列表，执行后我需要将列表分配给我的类属性

List<tblchargemaster> charge = new List<tblchargemaster>();

charge = (List<tblchargemaster>) ObjDB.SelectQuery("tblchargemaster");

tblchargemaster是类类型，SelectQuery函数返回List<dynamic>。如何将此动态列表转换为具有类类型的列表？

     public List<dynamic> SelectQuert(string TableName)
    {
        Conn.Open();

        DataTable dt = new DataTable("map");

        string Query = "Select * from " + TableName;            
        MySqlDataAdapter dr = new MySqlDataAdapter(Query, Conn);
        dr.Fill(dt);

        List<dynamic> dynamicDt = dt.ToDynamic();

        Conn.Close();

        return dynamicDt;
    }

通用类是

    public static class DataTableExtensions
{
    public static List<dynamic> ToDynamic(this DataTable dt)
    {
        var dynamicDt = new List<dynamic>();
        foreach (DataRow row in dt.Rows)
        {
            dynamic dyn = new ExpandoObject();
            foreach (DataColumn column in dt.Columns)
            {
                var dic = (IDictionary<string, object>)dyn;
                dic[column.ColumnName] = row[column];
                dynamicDt.Add(dyn);
            }
        }
        return dynamicDt;
    }
}

Answer 1

编辑，因为不支持从动态到强类型的显式转换。

var charge = ObjDB.SelectQuert("tblchargemaster").Cast<tblchargemaster>();

变为：

var charge = ObjDB.SelectQuert("tblchargemaster").Select(CastDynamicTo<tblchargemaster>)

而CastDynamicTo<tblchargemaster>是通过Is there a way to convert a dynamic or anonymous object to a strongly typed, declared object?

的帮助实现的

Answer 2

使用Cast<tblchargemaster>()方法：

List<tblchargemaster> charge = new List<tblchargemaster>();

charge = charge.AddRange(
   ObjDB.SelectQuert("tblchargemaster").Cast<tblchargemaster>());

如何在C＃</ourclass> </dynamic>中将List <dynamic>转换为List <ourclass>

2 个答案: