使用内省在集合上设置标量值

发布于 2024-12-06 12:32:41 字数 725 浏览 0 评论 0原文

动态设置对象属性的值。我有一个包含此类功能的函数，并且效果很好。但是，我想让它查看属性类型以查看它是否是某种集合并将值/对象添加到集合中。

我尝试做类似的事情： if (object is ICollection) 问题是 VS2010 希望我输入我不知道如何以编程方式执行的集合。

所以我想做的是像下面给定的 subject 是目标对象，value 是要设置的值：

public void setPropertyOnObject(object subject, string Name, object value)
{
  var property = subject.GetType().GetProperty(Name)
  // -- if property is collection ??
  var collection = property.GetValue(subject, null);
  collection.add(value)
  // -- if propert is not a collection
  property.SetValue(subject, value, null);
}

原文

I am doing something like the answer on:
Set object property using reflection

Dynamically setting the value of a object property. I have a function wrapping this sort of functionality and it works great. However, I want to make it so that it looks at the property type to see if it is some sort of collection and add the value/object to the collection.

I tried to do something like: if (object is ICollection) The problem is that VS2010 wants me to type the collection which I dont know how to do programatically.

So what I want to do is something like the following given subject is the target object and value is value to be set:

public void setPropertyOnObject(object subject, string Name, object value)
{
  var property = subject.GetType().GetProperty(Name)
  // -- if property is collection ??
  var collection = property.GetValue(subject, null);
  collection.add(value)
  // -- if propert is not a collection
  property.SetValue(subject, value, null);
}

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Bonjour°[大白 2024-12-13 12:32:41

您可以动态检查类型化集合（并向其中添加项目），如下所示：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            Object subject = new HasList();
            Object value = "Woop";
            PropertyInfo property = subject.GetType().GetProperty("MyList", BindingFlags.GetProperty | BindingFlags.Instance | BindingFlags.Public);
            var genericType = typeof (ICollection<>).MakeGenericType(new[] {value.GetType()});
            if (genericType.IsAssignableFrom(property.PropertyType))
                genericType.GetMethod("Add").Invoke(property.GetValue(subject, null), new[] { value });
        }
    }

    internal class HasList
    {
        public List<String> MyList { get; private set; }
        public HasList()
        {
            MyList = new List<string>();
        }
    }
}

You can dynamically check a typed collection (and add an item to it) thusly:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            Object subject = new HasList();
            Object value = "Woop";
            PropertyInfo property = subject.GetType().GetProperty("MyList", BindingFlags.GetProperty | BindingFlags.Instance | BindingFlags.Public);
            var genericType = typeof (ICollection<>).MakeGenericType(new[] {value.GetType()});
            if (genericType.IsAssignableFrom(property.PropertyType))
                genericType.GetMethod("Add").Invoke(property.GetValue(subject, null), new[] { value });
        }
    }

    internal class HasList
    {
        public List<String> MyList { get; private set; }
        public HasList()
        {
            MyList = new List<string>();
        }
    }
}

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