C＃Array方法帮助

Question

有人可以告诉我如何以更好，更优雅的方式重写下面的方法吗？

// in class------------------

    public static void RefreshAllDropdownlists(DropDownList ddlRemoveUsersFromRole, DropDownList ddlAddUsersToRole, DropDownList ddlAddAllUsersToRole, DropDownList ddlRemoveAllUsersFromRole, DropDownList ddlDeleteAllUsersFromRole)
    {
        ddlRemoveUsersFromRole.ClearSelection();
        ddlAddUsersToRole.ClearSelection();
        ddlAddAllUsersToRole.ClearSelection();
        ddlRemoveAllUsersFromRole.ClearSelection();
        ddlDeleteAllUsersFromRole.ClearSelection();
    }

// in codebehind------------------

UserGvUtil.RefreshAllDropdownlists(ddlRemoveUsersFromRole, ddlAddUsersToRole, ddlAddAllUsersToRole, ddlRemoveAllUsersFromRole, ddlDeleteAllUsersFromRole);

谢谢！

Answer 1

使用params参数修饰符传递DropDownList s：

的数组

public static void RefreshAllDropdownlists(params DropDownList[] dropDownLists)
{
    foreach (DropDownList ddl in dropDownLists)
    {
        ddl.ClearSelection();
    }
}

用法与您当前的方法相同

Answer 2

var listsToRefresh = new List<DropDownList>
                {
                    ddlRemoveUsersFromRole,
                    ddlAddUsersToRole,
                    ddlAddAllUsersToRole,
                    ddlRemoveAllUsersFromRole,
                    ddlDeleteAllUsersFromRole
                };
listsToRefresh.ForEach(l=>l.ClearSelection());

有很多方法可以做到这一点，我更喜欢这个。如果你所做的只是在每一个上执行ClearSelection（），那么就不需要为那一行代码创建一个方法。但是，如果你想在每个DropDownlist上做更多的工作，那么我认为使用扩展方法可以保持优雅。

 public static class DropDownListExtensions
    {
        public static void Reset(this DropDownList dropDownList)
        {
            dropDownList.ClearSelection();
            //... do more stuff

        }
    }

listsToRefresh.ForEach(l=>l.Reset());

Answer 3

像

这样的东西

public static void RefreshAllDropdownlists(params DropDownList[] dropDownLists)
{
    if (dropDownLists != null)
        foreach (var ddl in dropDownLists)
            ddl.ClearSelection();
}

Answer 4

您可以将DropDownList对象列表传递给该函数，然后您可以执行：

public static void RefreshAllDropdownlists(List<DropDownList> lists)
{
   foreach(DropDownList dropDown in lists)
   {
     dropDown.ClearSelection();
   }
}