使用SerializableDynamicObject进行动态排序 [英] Dynamic Sorting with a SerializableDynamicObject

问题描述

我正在使用这篇文章执行排序 - 最初我的代码使用动态类。

然后我发现WCF上的序列化问题，所以我切换到使用 SerializableDynamicObject ，现在排序代码中断行：

  PropertyInfo pi = type。的getProperty（丙）; 
  

与SerializableDynamicObject没有名为Name的属性的错误 - 其中Name是价值的道具

我想最简单的事情是找到序列化排序算法的动态类型的替代方法。任何指向此方向的指针都将不胜感激！

我看过这个例子，但是我收到错误信息：

 具有参数的构造函数（SerializationInfo，StreamingContext ）在ISerializable类型中没有找到
  

解决方案

FastMember ，适用于基于反射和动态基于对象（取决于你传递给 TypeAccessor.Create ）

  using System; 
使用System.Collections; 
使用System.Collections.Generic; 
使用System.Dynamic; 
使用FastMember; 
 
命名空间ConsoleApplication6 
 {
类程序
 {
 static void Main（）
 {
 var list = new List&动态>（）; 
 dynamic obj = new ExpandoObject（）; 
 obj.Foo = 123; 
 obj.Bar =xyz; 
 list.Add（obj）; 
 obj = new ExpandoObject（）; 
 obj.Foo = 456; 
 obj.Bar =def; 
 list.Add（obj）; 
 obj = new ExpandoObject（）; 
 obj.Foo = 789; 
 obj.Bar =abc; 
 list.Add（obj）; 
 
 var accessor = TypeAccessor.Create（
 typeof（IDynamicMetaObjectProvider））; 
 string propName =Bar; 
 list.Sort（（x，y）=> Comparer.Default.Compare（
 accessor [x，propName]，accessor [y，propName]））; 
 
 foreach（列表中的var项目）{
 Console.WriteLine（item.Bar）; 
} 
} 
} 
} 
  

它可能值得注意的是，对于基于反射的类型，这不是在每个项目的基础上使用反射;所有这些都通过元编程进行了优化。

I have a need to sort a collection of these based upon criteria determined at run-time.

I was using the code from this article to perform the sorting - originally my code used the dynamic class.

Then I hit issues with serialization over WCF so I switched to using a SerializableDynamicObject and now the sorting code breaks on the line:

  PropertyInfo pi = type.GetProperty(prop);

with the error that SerializableDynamicObject does not have a property called "Name" - where "Name" was the value of prop.

I guess the simplest thing to do is to find an alternate way of serializing a dynamic type that the sorting algorithm works with. Any pointers in this direction would be appreciated!

I have looked at this example, but I get the error message:

The constructor with parameters (SerializationInfo, StreamingContext) is not found in ISerializable type

解决方案

Here's some code using FastMember for this, which works for both reflection-based and dynamic-based objects (depending on what you pass to TypeAccessor.Create)

using System;
using System.Collections;
using System.Collections.Generic;
using System.Dynamic;
using FastMember;

namespace ConsoleApplication6
{
    class Program
    {
        static void Main()
        {
            var list = new List<dynamic>();
            dynamic obj = new ExpandoObject();
            obj.Foo = 123;
            obj.Bar = "xyz";
            list.Add(obj);
            obj = new ExpandoObject();
            obj.Foo = 456;
            obj.Bar = "def";
            list.Add(obj);
            obj = new ExpandoObject();
            obj.Foo = 789;
            obj.Bar = "abc";
            list.Add(obj);

            var accessor = TypeAccessor.Create(
                typeof(IDynamicMetaObjectProvider));
            string propName = "Bar";
            list.Sort((x,y) => Comparer.Default.Compare(
                accessor[x, propName], accessor[y,propName]));

            foreach(var item in list) {
                Console.WriteLine(item.Bar);
            }
        }
    }
}

It may be worth mentioining that for reflection-based types, this does not use reflection on a per-item basis; all that is optimized away via meta-programming.

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