c# - 将新属性添加到列表

Question

我有一个列表，并希望在填充列表后添加两个新属性。

可以这样做吗？

C# 列表

List<Usp_GetListItemsBySystemResult> PendingListOfItemsToControl = new List<Usp_GetListItemsBySystemResult>(); // Items to Control in Running memory 

// Get items to Control into running memory
FAItemsUnderControl fItemsUnderControl = new FAItemsUnderControl(ConfigurationManager.AppSettings["DatabaseConnectionString"]);
PendingListOfItemsToControl = fItemsUnderControl.getItemsUnderControl(DropDownListSystems.Text.ToString(), "ALL").ToList<Usp_GetListItemsBySystemResult>();

// Add new paramaters to the list here ????????

要添加的 C# 新属性

    public string ItemRequestStatus { get; set; } // Determines the change status if applicable
    public bool IsButtonEnabled { get; set; } // Determines if the delete button is enabled or disabled

C# 类

public class Usp_GetListItemsBySystemResult
{
    public Usp_GetListItemsBySystemResult();

    public DateTime? Creation_DateTime { get; set; }
    public string Item_Backup_Location { get; set; }
    public string Item_Category { get; set; }
    public short? Item_Check_Interval_Time { get; set; }
    public DateTime? Item_Creation_DateTime { get; set; }
    public DateTime? Item_Last_Access_DateTime { get; set; }
    public DateTime? Item_Last_Modified_DateTime { get; set; }
    public string Item_Name { get; set; }
    public string Item_Path { get; set; }
    public int? Item_Size { get; set; }
    public string Item_Status { get; set; }
    public string Item_Value { get; set; }
    public string Item_Value_SHA256 { get; set; }
    public int? ItemUnderControl_ID { get; set; }
}

Answer 1

您可以创建一个 expando 对象并添加您想要的任何内容：

var myx = new ExpandoObject() as IDictionary<string, Object>;
myx.Add("NewProp", string.Empty);

Answer 2

您应该MyList使用继承自List. 像这样的东西：

public class MyList<T> : List<T>
{
    public string ItemRequestStatus { get; set; } // Determines the change status if applicable
    public bool IsButtonEnabled { get; set; } // Determines if the delete button is enabled or disabled

    public MyList()
    {

    }

    public MyList(IList<T> list)
        : base(list)
    {

    }
}

用法：

FAItemsUnderControl fItemsUnderControl = new FAItemsUnderControl(ConfigurationManager.AppSettings["DatabaseConnectionString"]);
var list = fItemsUnderControl.getItemsUnderControl(DropDownListSystems.Text.ToString(), "ALL").ToList<Usp_GetListItemsBySystemResult>();
MyList<Usp_GetListItemsBySystemResult> PendingListOfItemsToControl = new MyList<Usp_GetListItemsBySystemResult>(list);

Answer 3

您可以创建此类并使用 Linq 向此新属性添加值。

List<NewClass> = from x in GetListItemsBySystemResult 
                select new NewClass{
                  Creation_DateTime = x.Creation_DateTime ,
                  ...,
                  ItemRequestStatus = "Value",
                  IsButtonEnabled = "Value",
                  };

然后在这个新列表中，您已经填充了新值。