Question

using System;
using System.Linq;
using System.Text;
using System.Net;
using System.IO;

namespace LearningJustCode
{
    class Program
    {
        static void Main(string[] args)
        {
            Update();
        }

        static void Update()
        {
            var quote1 = new { Stock = "DELL", Quote = GetQuote("DELL") };
            var quote2 = new { Stock = "MSFT", Quote = GetQuote("MSFT") };
            var quote3 = new { Stock = "GOOG", Quote = GetQuote("GOOG") };

            var quotes = new object[] { quote1, quote2, quote3 };

            foreach (var item in quotes)
            {
                Console.WriteLine(item.Stock);
                Console.WriteLine(item.Quote.ToString());
            }
        Console.ReadKey();

        }

        static string GetQuote(string stock)
        {
            try
            {
                return InnerGetQuote(stock);
            }
            catch (Exception ex)
            {

                Console.WriteLine(ex.Message);
                return "N/A";
            }
        }

        static string InnerGetQuote(string stock)
        {
            string url = @"http://www.webservicex.net/stockquote.asmx/GetQuote?symbol={0}";
            var request = HttpWebRequest.Create(string.Format(url, stock));

            using (var response = request.GetResponse())
            {
                using (var reader = new StreamReader(response.GetResponseStream(), Encoding.ASCII))
                {
                    return reader.ReadToEnd();
                }
            }


        }
    }
}

我正对项目进行盘问; 可变物品只被指定使用。此代码稍作修改, 取自 Paul Kimmel C# Unleashed 的 Paul Kimmel 手册 C# Unleashed 。

Answer 1

Your array needs to be of the type of your stock quote. Your stock quote is an anonymous type, so we need to define the array anonymously as well. This can be done cleanly as:

    var quotes = new[]{  new { Stock = "DELL", Quote = "123" },
                         new { Stock = "MSFT", Quote = "123" },
                         new { Stock = "GOOG", Quote = "123" }};

    foreach (var item in quotes)
    {
        Console.WriteLine(item.Stock);
        Console.WriteLine(item.Quote.ToString());
    }

Answer 2

我猜问题就在这行里:

var quotes = new object[] { quote1, quote2, quote3 };

引号是一个对象数组,不是这种匿名类型的数组。每个前台也只有对象值。您可以尝试在一个行内或羊排表达式内组成数组。

一种“强”的肮脏工作方式正在变换成动态

        var quote1 = new { Stock = "DELL", Quote = ("DELL") };
        var quote2 = new { Stock = "MSFT", Quote = ("MSFT") };
        var quote3 = new { Stock = "GOOG", Quote = ("GOOG") };

        var quotes = new object[] { quote1, quote2, quote3 };

        foreach (dynamic item in quotes)
        {
            var r = item.Stock;

        }

较清洁的解决方案正在丢弃对象, 所以编译器可以生成一个匿名打字阵列。

        var quote1 = new { Stock = "DELL", Quote = ("DELL") };
        var quote2 = new { Stock = "MSFT", Quote = ("MSFT") };
        var quote3 = new { Stock = "GOOG", Quote = ("GOOG") };

        var quotes = new [] { quote1, quote2, quote3 };

        foreach (var item in quotes)
        {
            var r = item.Stock;

        }

友情链接