NewtonSoft json转换器"未终止字符串，期望分隔符:";“

我猜实际的问题是你没有评估HTTP响应头。

结果很可能是分批发送的，即传输编码是"chunked"，但你天真的读者只会得到第一个块并使用它，而不是等待更多。这可能会在请求之间发生变化(例如，直接交付时分块，缓存后分块，反之亦然)。所以最后，不要重新发明轮子，只使用WebClient。

阅读RFC章节3.6.1:

3.6.1分块传输编码

分块编码修改消息体以便将其作为一系列块进行传输，每个块都有自己的大小指示符，后面是一个可选的尾部，包含实体头字段。这允许动态生成的内容与控件一起传输接收方验证其是否拥有所需的信息收到完整消息。

当你遇到这样的问题时，试着把你的代码分成更小的部分，并检查这些部分是否交付了预期的结果。

在您的示例中，HTTP下载显然是不完整的，因此您不能真正责怪JSON解析器抛出错误(因为它们是有效的)。

我用下面的单元测试复制了您的异常

using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Sockets;
using System.Text;
using System.Threading.Tasks;
using NUnit.Framework;
//using ConsoleApplication1;
namespace TCPclient
{
    [TestFixture]
    public class Program
    {
        [Test]
        public void Main1()
        {
            string response = GetCoctailString();
            try
            {
                dynamic jsonData = JsonConvert.DeserializeObject(response);
                List<Drink> drankjes = new List<Drink>();
                for (int i = 0; i < jsonData.drinks.Count; i++)
                {
                    try
                    {
                        string id = jsonData.drinks[i].idDrink;
                        string drink = jsonData.drinks[i].strDrink;
                        string category = jsonData.drinks[i].strCategory;
                        string instructions = jsonData.drinks[i].strInstructions;
                        string glass = jsonData.drinks[i].strGlass;
                        Console.WriteLine(glass);
                        var d = new Drink(id, drink, category, instructions);
                        drankjes.Add(d);
                    }
                    catch (Exception)
                    {
                        Console.WriteLine("error");
                    }
                }
            }
            catch (Exception e)
            {
                Console.WriteLine(e.Message);
            }
            Console.ReadKey();
        }
        private static string GetCoctailString()
        {
            return "{ 'drinks':[{'idDrink':'15679','strDrink':'Midori Margarita','strCategory':'Ordinary Drink','strAlcoholic':'Alcoholic','strGlass':'Cocktail glass','strInstructions':'Moisten rim of cocktail glass with lime juice and dip in salt. Shake ingredients together, and pour into glass filled with crushed ice. Option: Mix above ingredients with one cup of ice in blender for a smooth, '"granita'" type drink.','strDrinkThumb':null,'strIngredient1':'Tequila','strIngredient2':'Triple sec','strIngredient3':'Lime juice','strIngredient4':'Midori melon liqueur','strIngredient5':'Salt','strIngredient6':'','strIngredient7':'','strIngredient8':'','strIngredient9':'','strIngredient10':'','strIngredient11':'','strIngredient12':'','strIngredient13':'','strIngredient14':'','strIngredient15':'','strMeasure1':'1 1/2 oz ','strMeasure2':'1/2 oz ','strMeasure3':'1 oz fresh ','strMeasure4':'1/2 oz ','strMeasure5':''n','strMeasure6':''n','strMeasure7':''n','strMeasure8':''n','strMeasure9':''n','strMeasure10':''n','strMeasure11':'','strMeasure12':'','strMeasure13':'','strMeasure14':'','strMeasure15':'','dateModified':null}]}";
        }
    }
    internal class Drink
    {
        public Drink(string idDrink, string strDrink, string strCategory, string strInstructions){}
        public string idDrink { get; set; }
        public string strDrink { get; set; }
        public string strCategory { get; set; }
        public string empty { get; set; }
        public string strInstructions { get; set; }
    }
}

我已经从你提到的网站(http://www.thecocktaildb.com/api/json/v1/1/lookup.php?i=15679)的价值似乎JSON是无效的，在将"granita"的文本更改为不同的引号后，一切都工作了!

response = response.Replace("'"", "'''"");

我已经复制了你的代码与一些小的变化，它的工作很好，就我所能看到的。请注意使用using语句，这是使用IDisposable对象和对象构造方式的良好实践(我使用了很棒的json2sharp工具):

internal class Program
{
    private static void Main(string[] args)
    {
        RootObject root = new RootObject();
        using (WebClient wc = new WebClient())
        {
            var json = wc.DownloadString("http://www.thecocktaildb.com/api/json/v1/1/search.php?s=margarita");
            root = JsonConvert.DeserializeObject<RootObject>(json);
        }
        Console.WriteLine(root.drinks.Count);
        Console.ReadLine();
    }
}
public class Drink
{
    public string idDrink { get; set; }
    public string strDrink { get; set; }
    public string strCategory { get; set; }
    public string strAlcoholic { get; set; }
    public string strGlass { get; set; }
    public string strInstructions { get; set; }
    public object strDrinkThumb { get; set; }
    public string strIngredient1 { get; set; }
    public string strIngredient2 { get; set; }
    public string strIngredient3 { get; set; }
    public string strIngredient4 { get; set; }
    public string strIngredient5 { get; set; }
    public string strIngredient6 { get; set; }
    public string strIngredient7 { get; set; }
    public string strIngredient8 { get; set; }
    public string strIngredient9 { get; set; }
    public string strIngredient10 { get; set; }
    public string strIngredient11 { get; set; }
    public string strIngredient12 { get; set; }
    public string strIngredient13 { get; set; }
    public string strIngredient14 { get; set; }
    public string strIngredient15 { get; set; }
    public string strMeasure1 { get; set; }
    public string strMeasure2 { get; set; }
    public string strMeasure3 { get; set; }
    public string strMeasure4 { get; set; }
    public string strMeasure5 { get; set; }
    public string strMeasure6 { get; set; }
    public string strMeasure7 { get; set; }
    public string strMeasure8 { get; set; }
    public string strMeasure9 { get; set; }
    public string strMeasure10 { get; set; }
    public string strMeasure11 { get; set; }
    public string strMeasure12 { get; set; }
    public string strMeasure13 { get; set; }
    public string strMeasure14 { get; set; }
    public string strMeasure15 { get; set; }
    public object dateModified { get; set; }
}
// used http://json2csharp.com/ to get an object from the json string
public class RootObject
{
    public List<Drink> drinks { get; set; }
}