如何将动态成员名称和值添加到 ExpandoObject class 的实例？

Question

假设成员名称列表存储在如下数组中，

string[] myMembers = { "ChapterName", "Medium", "LastName", "OrderID" };

我编写了以下代码来生成动态 class 和成员以及随机值。

var myDynamicClassList = new List<ExpandoObject>();
        foreach (var MemberName in myMembers)
        {
            dynamic dynamicClass = new ExpandoObject();
            dynamicClass.MemberName = new Random().Next();
            myDynamicClassList.Add(dynamicClass);
        }

为了显示上面的输出myDynamicClassList我写了下面的代码

foreach (var x in myDynamicClassList)
        {
            foreach (var property in (IDictionary<String, Object>)x)
            {
                Console.WriteLine(property.Key + ": " + property.Value);
            }
        }

正在显示这样的输出

MemberName : 123465461

MemberName : 564613611

MemberName : 134654321

MemberName : 786451214

但是我期望的输出不是上面的输出

ChapterName : 123465461

Medium : 564613611

LastName : 134654321

OrderID : 786451214

这是我的问题，是否可以在 c# 中将动态成员名称添加到动态 class。如果可以请告诉我，如果不能请指导我完成这项工作。

非常感谢您的帮助。

Answer 1

如 similar question ("Dynamically adding properties to an ExpandoObject") 中所述，您可以直接使用 IDictionary 来完成此操作：

string[] myMembers = { "ChapterName", "Medium", "LastName", "OrderID" };
var myDynamicClassList = new List<ExpandoObject>();
Random random = new Random();
foreach (var MemberName in myMembers)
{
    IDictionary<string, object> dynamicClass = (IDictionary<string, object>)(new ExpandoObject());
    dynamicClass.Add(MemberName, random.Next());
    myDynamicClassList.Add((ExpandoObject)dynamicClass);
}
foreach (var x in myDynamicClassList)
{
    foreach (var property in (IDictionary<String, Object>)x)
    {
        Console.WriteLine(property.Key + ": " + property.Value);
    }
}

但是，您应该了解此方法可能存在的已知内存限制，如上面链接的 post 或 Microsoft issue 的评论中所述。我可能会重新考虑设计以考虑实际需要哪些属性，或者在可行的情况下简单地使用 Dictionary（完全避免动态 ExpandoObject）。

我还把你的 Random 移到了循环之外。 Creating new instances of Random inside a loop may not give you the results you expect...

Answer 2

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Collections;
using System.IO;

namespace Deligate
{
    class Program
    {
       public static List<Employee> empList = new List<Employee>();
        public static void UserInfo(int val)
        {
            Employee emp = new Employee();
            Console.WriteLine($"Enter {val+1} Employee Details :- ");
            Console.WriteLine("Enter Your Name: ");
            emp.Name= Console.ReadLine();
            Console.WriteLine("Enter your Email: ");
            emp.Email = Console.ReadLine();
            Console.WriteLine("Enter Mobile Number");
            emp.Mobile = Console.ReadLine();
            empList.Add(emp);
           
        }
        public static void CountEmp()
        {
            
            Console.WriteLine("How many user you want to add:");
            var UserCount = int.Parse(Console.ReadLine());

            for (int i = 0; i < UserCount; i++)
            {
                UserInfo(i);
            }
            foreach (var employee in empList) {
                Console.WriteLine(employee.Name+ ", " + employee.Email+", "+employee.Mobile);
                
            }
            System.IO.File.Delete(@"D:\Compare.txt");

            foreach (var el in empList)
            {
               System.IO.File.AppendAllText(@"D:\Compare.txt", el.Name+", "+el.Email+", "+el.Mobile + Environment.NewLine);
                
            }
        }
         public static void Main(string[] args)
        {
            CountEmp();
            Console.ReadKey();
           
        }
    }
}

如何将动态成员名称和值添加到 ExpandoObject class 的实例？

How to add dynamic member name and value to an instance of ExpandoObject class?

c#

expandoobject

c#-4.0