如何在C＃中将键值对添加到静态字典 [英] How to add key value pair to static dictionary in C#

问题描述

我有一个静态字典



public static Dictionary< Guid，Dictionary< string，object>>商店{get;设置;}



我想从另一个类为上面的字典添加值



Guid clientId = Guid.NewGuid（）;

Dictionary< string，object> storageKeyDictionary = new Dictionary< string，object>（）{{parameter，test}};



Storage.Store.Add（clientId，storageKeyDictionary）;



但它返回错误为对象引用未设置为对象的实例。在执行时，请告诉我代码有什么问题？



我尝试过：



我试图将值添加到私有静态字典但返​​回错误。

I have a static dictionary

public static Dictionary<Guid, Dictionary<string, object>> Store {get; set;}

I want to add value to the above dictionary from another class as

Guid clientId = Guid.NewGuid();
Dictionary<string,object> storageKeyDictionary = new Dictionary<string, object>() { { "parameter", "test" }};

Storage.Store.Add(clientId, storageKeyDictionary);

But it return error as "Object reference not set to an instance of an object." while executing, please tell me what is wrong with the code?

What I have tried:

I have tried to add value to private static dictionary but returned error.

推荐答案

您的代码几乎是正确的，但在Storage.Store之前。你缺少Add（）：

Your code is almost correct, but before Storage.Store.Add() you are missing:

Store = new Dictionary<Guid, Dictionary<string, object>>();

您必须先初始化您的商店对象。使用如下

you have to initialize your store object first.Use like below

public class Program
   {
       public static Dictionary<Guid, Dictionary<string, object>> Store {get; set;}

       static Program()
       {
           Store=new  Dictionary<Guid, Dictionary<string, object>>();
       }
       public static void Main(string[] args)
       {

           Guid clientId = Guid.NewGuid();
           Dictionary<string,object> storageKeyDictionary = new Dictionary<string, object>() { { "parameter", "test" }};

           Store.Add(clientId, storageKeyDictionary);

           //Your code goes here
           Console.WriteLine("Hello, world!");
       }
   }

或者你可以直接写成

or you can directly write like

public class Program
    {
        public static Dictionary<Guid, Dictionary<string, object>> Store =new  Dictionary<Guid, Dictionary<string, object>>();
        
      
        public static void Main(string[] args)
        {
            
            Guid clientId = Guid.NewGuid();
            Dictionary<string,object> storageKeyDictionary = new Dictionary<string, object>() { { "parameter", "test" }};

            Store.Add(clientId, storageKeyDictionary);
            
            //Your code goes here
            Console.WriteLine("Hello, world!");
        }
    }

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