{"id":12731,"date":"2024-03-14T16:31:04","date_gmt":"2024-03-14T16:31:04","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-is-the-dictionary-used-in-c\/"},"modified":"2025-08-05T06:00:13","modified_gmt":"2025-08-05T06:00:13","slug":"how-is-the-dictionary-used-in-c","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-is-the-dictionary-used-in-c\/","title":{"rendered":"C# Dictionary Guide: Key-Value Pairs Usage"},"content":{"rendered":"

A Dictionary in C# is a collection based on key-value pairs, used to store and manipulate pairs of keys and values. It is a type of generic collection class that can store keys and values of different types according to the requirements.<\/p>\n

Here are some common uses of the dictionary:<\/p>\n

    \n
  1. Create a Dictionary object:<\/li>\n<\/ol>\n
    Dictionary<TKey, TValue> dictionary = new<\/span> Dictionary<TKey, TValue>();\r\n<\/code><\/pre>\n
    TKey and TValue represent the types of keys and values you want to store.<\/p>\n
      \n
    1. Add a key-value pair:<\/li>\n<\/ol>\n
      dictionary.Add(key, value<\/span>);\r\n<\/code><\/pre>\n
        \n
      1. Accessing and modifying key-value pairs.<\/li>\n<\/ol>\n
        TValue value<\/span> = dictionary[key]; \/\/ \u83b7\u53d6\u6307\u5b9a\u952e\u7684\u503c<\/span>\r\ndictionary[key] = newValue; \/\/ \u4fee\u6539\u6307\u5b9a\u952e\u7684\u503c<\/span>\r\n<\/code><\/pre>\n
          \n
        1. Check if the key exists:<\/li>\n<\/ol>\n
          bool<\/span> containsKey = dictionary.ContainsKey(key);\r\n<\/code><\/pre>\n
            \n
          1. Remove key-value pair.<\/li>\n<\/ol>\n
            dictionary.Remove(key);\r\n<\/code><\/pre>\n
              \n
            1. Iterate the key-value pairs:<\/li>\n<\/ol>\n
              foreach<\/span> (KeyValuePair<TKey, TValue> pair in<\/span> dictionary)\r\n{\r\n    TKey key = pair.Key;\r\n    TValue value<\/span> = pair.Value;\r\n    \/\/ \u5904\u7406\u952e\u503c\u5bf9<\/span>\r\n}\r\n<\/code><\/pre>\n
                \n
              1. Collecting a set of keys or values:<\/li>\n<\/ol>\n
                ICollection<TKey> keys = dictionary.Keys; \/\/ \u83b7\u53d6\u6240\u6709\u952e\u7684\u96c6\u5408<\/span>\r\nICollection<TValue> values = dictionary.Values; \/\/ \u83b7\u53d6\u6240\u6709\u503c\u7684\u96c6\u5408<\/span>\r\n<\/code><\/pre>\n
                These are some common uses of the Dictionary that also offers additional methods and properties to meet various needs.<\/p>\n","protected":false},"excerpt":{"rendered":"
                A Dictionary in C# is a collection based on key-value pairs, used to store and manipulate pairs of keys and values. It is a type of generic collection class that can store keys and values of different types according to the requirements. Here are some common uses of the dictionary: Create a Dictionary object: Dictionary<TKey, […]<\/p>\n","protected":false},"author":10,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[4740,6232,381,16740,7113],"class_list":["post-12731","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-c-collections","tag-c-dictionary","tag-c-programming","tag-generic-dictionary","tag-key-value-pairs"],"yoast_head":"\nC# Dictionary Guide: Key-Value Pairs Usage - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Master C# Dictionary collections: Learn declaration, key-value operations, and practical implementation with code examples.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/blog\/how-is-the-dictionary-used-in-c\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"C# Dictionary Guide: Key-Value Pairs Usage\" \/>\n<meta property=\"og:description\" content=\"Master C# Dictionary collections: Learn declaration, key-value operations, and practical implementation with code examples.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/blog\/how-is-the-dictionary-used-in-c\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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