c# - 声明 2 个相似的匿名对象

Question

下面是2个匿名对象的声明。第二个与第一个完全相同，只是其中没有 lastRefresh 元素。

有没有办法在不复制完全相同的部分的情况下声明这 2 个对象？

var routeValuesForAutoRefresh = new
{
    page = @ViewBag.nextPage,
    lastRefresh = @ViewBag.lastRefresh,
    searchTerm = Request["searchTerm"],
    searchColumn = Request["searchColumn"],
    searchOrder = Request["searchOrder"],
    searchDescending = (Request["searchDescending"] ?? "true").ToLower().IndexOf("true") > -1,
    requestStatus0 = (Request["requestStatus0"] ?? "false").ToLower().IndexOf("true") > -1,
    requestStatus1 = (Request["requestStatus1"] ?? "true").ToLower().IndexOf("true") > -1,
    requestStatus3 = (Request["requestStatus3"] ?? "true").ToLower().IndexOf("true") > -1,
    requestStatus5 = (Request["requestStatus5"] ?? "true").ToLower().IndexOf("true") > -1,
    requestStatus7 = (Request["requestStatus7"] ?? "true").ToLower().IndexOf("true") > -1,
    requestStatus9 = (Request["requestStatus9"] ?? "true").ToLower().IndexOf("true") > -1
};
var routeValuesForNextPage = new
{
    page = @ViewBag.nextPage,
    searchTerm = Request["searchTerm"],
    searchColumn = Request["searchColumn"],
    searchOrder = Request["searchOrder"],
    searchDescending = (Request["searchDescending"] ?? "true").ToLower().IndexOf("true") > -1,
    requestStatus0 = (Request["requestStatus0"] ?? "false").ToLower().IndexOf("true") > -1,
    requestStatus1 = (Request["requestStatus1"] ?? "true").ToLower().IndexOf("true") > -1,
    requestStatus3 = (Request["requestStatus3"] ?? "true").ToLower().IndexOf("true") > -1,
    requestStatus5 = (Request["requestStatus5"] ?? "true").ToLower().IndexOf("true") > -1,
    requestStatus7 = (Request["requestStatus7"] ?? "true").ToLower().IndexOf("true") > -1,
    requestStatus9 = (Request["requestStatus9"] ?? "true").ToLower().IndexOf("true") > -1
};

Answer 1

它没有语法，但你有几个不错的解决方法:

• 命名你的类，并从另一个派生(或从一个公共(public)基础派生)
• 使用公共(public)字段创建第三个匿名对象，然后在两个“真实”命名对象中使用它
• 制作单独的局部变量，并使用它们制作两个匿名对象的字段。

我更喜欢第一种方法，但其他两种方法会有所改进。

这是第二种方法的例子:

var routeValuesForNextPage = new
{
    page = @ViewBag.nextPage,
    searchTerm = Request["searchTerm"],
    searchColumn = Request["searchColumn"],
    searchOrder = Request["searchOrder"],
    searchDescending = (Request["searchDescending"] ?? "true").ToLower().IndexOf("true") > -1,
    requestStatus0 = (Request["requestStatus0"] ?? "false").ToLower().IndexOf("true") > -1,
    requestStatus1 = (Request["requestStatus1"] ?? "true").ToLower().IndexOf("true") > -1,
    requestStatus3 = (Request["requestStatus3"] ?? "true").ToLower().IndexOf("true") > -1,
    requestStatus5 = (Request["requestStatus5"] ?? "true").ToLower().IndexOf("true") > -1,
    requestStatus7 = (Request["requestStatus7"] ?? "true").ToLower().IndexOf("true") > -1,
    requestStatus9 = (Request["requestStatus9"] ?? "true").ToLower().IndexOf("true") > -1
};
var routeValuesForAutoRefresh = new {
    routeValuesForNextPage
,   lastRefresh = @ViewBag.lastRefresh
};

这是第三种方法的示例:

var page = @ViewBag.nextPage;
var searchTerm = Request["searchTerm"];
var searchColumn = Request["searchColumn"];
var searchOrder = Request["searchOrder"];
var searchDescending = (Request["searchDescending"] ?? "true").ToLower().IndexOf("true") > -1;
var requestStatus0 = (Request["requestStatus0"] ?? "false").ToLower().IndexOf("true") > -1;
var requestStatus1 = (Request["requestStatus1"] ?? "true").ToLower().IndexOf("true") > -1;
var requestStatus3 = (Request["requestStatus3"] ?? "true").ToLower().IndexOf("true") > -1;
var requestStatus5 = (Request["requestStatus5"] ?? "true").ToLower().IndexOf("true") > -1;
var requestStatus7 = (Request["requestStatus7"] ?? "true").ToLower().IndexOf("true") > -1;
var requestStatus9 = (Request["requestStatus9"] ?? "true").ToLower().IndexOf("true") > -1;

var routeValuesForAutoRefresh = new {
    page,
    lastRefresh = @ViewBag.lastRefresh,
    searchTerm,
    searchColumn,
    searchOrder,
    searchDescending,
    requestStatus0,
    requestStatus1,
    requestStatus3,
    requestStatus5,
    requestStatus7,
    requestStatus9
};
var routeValuesForNextPage = new {
    page,
    searchTerm,
    searchColumn,
    searchOrder,
    searchDescending,
    requestStatus0,
    requestStatus1,
    requestStatus3,
    requestStatus5,
    requestStatus7,
    requestStatus9
};