如何使用 Reflection 设置类型为 List的属性

发布于 2024-08-03 03:50:11 字数 875 浏览 3 评论 0原文

已经有一个类似的问题但似乎并没有询问问题所暗示的情况。

用户询问列表中的自定义类，但他的列表对象是字符串类型。

我有一个类 Foo，它有一个 Bars 列表：

    public class Foo : FooBase
    { 
       public List<Bar> bars {get; set;} 
       public Foo() {}
    }

    public class Bar
    {
       public byte Id { get; set; } 
       public byte Status { get; set; } 
       public byte Type { get; set; } 
       public Bar(){} 
    }

我通过 Activator.CreateInstance() 使用反射实例化 Foo。现在我需要用 Bar 对象填充该条形列表。

Foo 是使用

Assembly.GetAssembly(FooBase).GetTypes().Where(type => type.IsSubclassOf(FooBase));

Bar 获得的，Bar 是同一程序集中的公共类。我需要以某种方式了解这种类型。我似乎看不出 Foo 中包含的列表的类型是什么。但我知道这是一个清单。我看到列表属性为 List`1。

我需要查看列表包含什么类型的对象并相应地处理它。

原文

There is already a similar question but it didn't seem to ask about the situation that the question implies.

The user asked about custom classes in a list but his list object is of type string.

I have a class Foo that has a list of Bars:

    public class Foo : FooBase
    { 
       public List<Bar> bars {get; set;} 
       public Foo() {}
    }

    public class Bar
    {
       public byte Id { get; set; } 
       public byte Status { get; set; } 
       public byte Type { get; set; } 
       public Bar(){} 
    }

I instantiate Foo using reflection via Activator.CreateInstance(). Now I need to populate that list of bars with Bar objects.

Foo is obtained using

Assembly.GetAssembly(FooBase).GetTypes().Where(type => type.IsSubclassOf(FooBase));

Bar is a public class in the same Assembly. I'll need to get at that type somehow. I can't seem to see what the type of the list contained in Foo is. I know it's a list though. I'm seeing the list property as List`1.

I'd need to see what type of object the list holds and handle that accordingly.

分享到QQ

分享到微博

如果你对这篇内容有疑问，欢迎到本站社区发帖提问参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。

发布评论

需要登录才能够评论，你可以免费注册一个本站的账号。

仲春光 2024-08-10 03:50:11

文本

List`1

是泛型在引擎盖下的编写方式 - 意思是“具有 1 个泛型类型 arg 的列表，又名 List<>”。如果您有 PropertyInfo，则应该已设置；这将是封闭的通用 List。您是否想在给定只是这个的情况下找到Bar？

如果是这样，这会在各种问题中讨论，包括这个；复制密钥位（我更喜欢针对 IList 进行编码，因为它处理一些边缘情况，例如从 List< 继承 /代码>）：

static Type GetListType(Type type) {
    foreach (Type intType in type.GetInterfaces()) {
        if (intType.IsGenericType
            && intType.GetGenericTypeDefinition() == typeof(IList<>)) {
            return intType.GetGenericArguments()[0];
        }
    }
    return null;
}

The text

List`1

is the way that generics are written under the bonnet - meaning "List with 1 generic type arg, aka List<>". If you have a PropertyInfo, you should be set; this will be the closed generic List<Bar>. Is it that you want to find the Bar given just this?

If so, this is discussed in various questions, including this one; to duplicate the key bit (I prefer to code against IList<T>, since it handles a few edge-cases such as inheriting from List<T>):

static Type GetListType(Type type) {
    foreach (Type intType in type.GetInterfaces()) {
        if (intType.IsGenericType
            && intType.GetGenericTypeDefinition() == typeof(IList<>)) {
            return intType.GetGenericArguments()[0];
        }
    }
    return null;
}

回复收藏 0 原文

尐籹人 2024-08-10 03:50:11

var prop = footype.GetProperty("bars");
// In case you want to retrieve the time of item in the list (but actually you don't need it...)
//var typeArguments = prop.PropertyType.GetGenericArguments();
//var listItemType = typeArguments[0];
var lst = Activator.CreateInstance(prop.PropertyType);
prop.SetValue(foo, lst, null);

var prop = footype.GetProperty("bars");
// In case you want to retrieve the time of item in the list (but actually you don't need it...)
//var typeArguments = prop.PropertyType.GetGenericArguments();
//var listItemType = typeArguments[0];
var lst = Activator.CreateInstance(prop.PropertyType);
prop.SetValue(foo, lst, null);

回复收藏 0 原文

~没有更多了~