c# - 向匿名类添加额外的属性

Question

有没有办法向匿名类添加额外的属性(或创建具有额外属性的新实例)？

string cssClasses = "hide";
object viewData = new { @class = cssClasses };
if (suppliedId != null)
{
  // add an extra id property to the viewData somehow...
  // desired end result is { @id = suppliedId, @class = cssClasses }
}
// ... code will be passing the viewData as the additionalViewData parameter in asp.mvc's .EditorFor method

Answer 1

不，你不能这样做。不过，您可以重新定义它:

dynamic viewData = new { @class = cssClasses };
if (suppliedId != null)
{
    viewData = new { @class = viewData.@class, yourExtra = Property };
}

请注意，我将其更改为dynamic。这只是为了让您无需强制转换为 dynamic 即可编辑属性。