c# - 要列出的词典词典

Question

我需要创建一个名称列表，这些名称是dictionary的键。至于我，它看起来完全没问题，但我有几个错误。结构必须像

{ paperony => {西红柿，1}，{胡萝卜，4}，素食者 => {西红柿，4}，{土豆，6} }

List<Dictionary<string, Dictionary<string, int>>> ingredients = new List<Dictionary<string, Dictionary<string, int>>>();
ingredients.Add(new Dictionary<string, Dictionary<string, int>>()
            {
                {
                    "Paperoni", 
                    {
                        {"Tomatoes", 1},
                        {"Carrot", 4}
                    }
                },

                {
                    "Vegetarian",
                    {
                        {"Tomatoes", 4},
                        {"Potatoes", 6}
                    }
                }
            }

        );

标签： c#

Answer 1

您需要使用字典的显式初始化。例如，

ingredients.Add(new Dictionary<string, Dictionary<string, int>>()
            {
                {
                    "Paperoni", 
                    new Dictionary<string, int>{
                        {"Tomatoes", 1},
                        {"Carrot", 4}
                    }
                },

                {
                    "Vegetarian",
                    new Dictionary<string, int>{
                        {"Tomatoes", 4},
                        {"Potatoes", 6}
                    }
                }
            }

        );

如果要避免使用显式初始化，可以使用以下方法。

ingredients.Add(new Dictionary<string, Dictionary<string, int>>()
            {
                ["Paperoni"] = {
                                ["Tomatoes"]= 1,
                                ["Carrot"]= 4
                                },
                ["Vegetarian"] = 
                                {
                               ["Tomatoes"]= 4,
                               ["Potatoes"]= 6
                                }
            }

        );