设置匿名类型属性名称

发布于 2024-11-08 04:53:34 字数 318 浏览 4 评论 0原文

假设我有以下代码：

string SomeConst = "OtherName";
var persons = GetPersons(); //returns list of Person
var q = persons.Select(p => 
new
{
    SomeConst = p.Name
});

基本上我希望在 q 序列中具有具有属性的匿名类型名为 OtherName 而不是 SomeConst。我怎样才能实现这样的行为？

原文

Let's say I have the following piece of code:

string SomeConst = "OtherName";
var persons = GetPersons(); //returns list of Person
var q = persons.Select(p => 
new
{
    SomeConst = p.Name
});

Basically I'd expect to have in q sequence of anonymous type with the property
named OtherName and not SomeConst.
How can I achieve such a behaviour?

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离去的眼神 2024-11-15 04:53:34

你不能那样做。匿名类型的属性名称必须在编译时已知。到底为什么你需要这样做？

您可以通过创建一系列字典而不是匿名对象来实现类似的效果：

string SomeConst = "OtherName";
var persons = GetPersons(); //returns list of Person
var q = persons.Select(p => 
new Dictionary<string, string>
{
    { SomeConst, p.Name }
});

You can't do that. The names of the properties of an anonymous type must be known at compile time. Why exactly do you need to do that?

You could achieve a similar effect by creating a sequence of dictionaries instead of anonymous objects:

string SomeConst = "OtherName";
var persons = GetPersons(); //returns list of Person
var q = persons.Select(p => 
new Dictionary<string, string>
{
    { SomeConst, p.Name }
});

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终止放荡 2024-11-15 04:53:34

我知道您可以动态添加在编译时名称未知的属性的唯一方法是 ExpandoObject ：

var q = persons.Select(p => { dynamic obj = new ExpandoObject(); obj.Name = p.Name; return obj; });

但我真的没有看到做这样的事情有任何兴趣。这样做很可能是一个非常糟糕的设计/想法。毫无疑问，你会创建比你解决任何问题更尴尬、不可读和难以维护的代码......

The only way I'm aware of you can dynamically add properties whose name is unknown at compile time is the ExpandoObject :

var q = persons.Select(p => { dynamic obj = new ExpandoObject(); obj.Name = p.Name; return obj; });

But I really don't see any interest in doing such a thing. It is most probably a very bad design/idea to do so. You will undoubtly create more awkward, unreadable and unmaintenable code than you will solve anything...

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