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1. Top results related to eight function of dictionary in c#

   • Dictionary Of Dictionaries in C#

     Top Answer

     Answered Dec 08, 2016 · 8 votes

     You can fill the dictionary directly in your loop

     private Dictionary<string, Dictionary<string, Dictionary<string, string>>> zooDict = new Dictionary<string, Dictionary<string, Dictionary<string, string>>>();-while (reader.Read()){ var location = reader.GetString(0).Trim(); var animal= reader.GetString(1).Trim(); var Monday= reader.GetValue(1).ToString().Trim(); var Tuesday= reader.GetValue(3).ToString().Trim(); if(!zooDict.ContainsKey(location)) zooDict[location] = new Dictionary<string, Dictionary<string, string>>(); zooDict[location][animal] = new Dictionary<string, string>() { { "MN", Monday }, { "Tu", Tuesday } };}

     As a side note, you might want to consider creating classes to represent your objects, add them to a dictionary or list, and use Newtonsoft Json.net (http://www.newtonsoft.com/json) to serialize them instead of using dictionaries for everything. For example, you can create a class:

     public class Animal{ public string Name { get; set; } public int Monday { get; set; } public int Tuesday { get; set; }}var zooDict = new Dictionary<string, List<Animal>>();// then in your while loop you do this if(!zooDict.ContainsKey(location)) zooDict[location] = new List<Animal>();zooDict[location].Add(new Animal() { /* fill Monday and Tuesday properties */ });

     Of course, you can take this one step further and create a class with properties string Location and List<Animal> Animals, and eliminate dictionaries altogether. It depends on your use case(s) I guess

     Check all answers on Stack Overflow

     1/5

   • c# Lookup for a value in Dictionary of Dictionary

     Top Answer

     Answered Jul 12, 2011 · 4 votes

     you could just have a separate lookup for users:

     Dictionary<string, InfoObject> userLookup;-

     This only of course if you want to optimize for lookup speed, the downside is that addition and removal you have to do now on two separate data structures which have to keep in sync.

     Check all answers on Stack Overflow

     2/5

   • C# - dictionary - How to get max of specific class value in dictionary?

     Top Answer

     Answered Aug 11, 2020 · 5 votes

     To get LineInfo with maximum lineDistance you can use Values collection. Since there is no MaxBy in standard LINQ you can achieve similar effect with Aggregate

     :

     var max = lines.Values .Aggregate((acc, curr) => acc.lineDistance > curr.lineDistance ? acc: curr);-

     Check all answers on Stack Overflow

     3/5

   • C# implementation of Dictionary to count occurrences of words returns duplicate words in output

     Top Answer

     Answered Mar 30, 2011 · 9 votes

     Another way is to split on non words.

     var lyrics = "I fly with the stars in the skies I am no longer tryin' to survive I believe that life is a prize But to live doesn't mean your alive Don't worry bout me and who I fire I get what I desire, It's my empire And yes I call the shots".ToLower();var contents = Regex.Split(lyrics, @"[^\w'+]");-

     Also here's an alternative (and probably more obscure) loop

     int value;foreach (var word in contents){ dict[word] = dict.TryGetValue(word, out value) ? ++value : 1; }dict.Remove("");

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     4/5

   • C# - Searching keys of dictionary vs searching values in List

     Top Answer

     Answered Jan 28, 2014 · 9 votes

     If by "better" you mean "faster" then use a dictionary. Dictionary keys are organized by hash codes so lookups are significantly faster that list searches with more than just a few items in the ocllection.

     With a good hashing algorithm, Dictionary searches can be close to O(1), meaning the search time is independent of the size of the dictionary. Lists, on the other hand, are O(n), meaning that the time is (on average) proportional to the size of the list.

     If you just have key items (not mapping keys to values) you might also try a HashSet

     . It has the benefit of O(1) lookups without the overhead of the Value side of a dictionary.

     (Granted the overhead is probably minimal, but why have it if you don't need it?)

     Check all answers on Stack Overflow

     5/5

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2. www.c-sharpcorner.com › article › dictionary-in-netDictionary in .NET C#: Syntax, Methods, and Example - C# Corner

   www.c-sharpcorner.com › article › dictionary-in-net

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   May 7, 2024 · The dictionary provides the Add method, so we can use that method for adding the data to the dictionary. Syntax. dictionary_object_name.Add( key_name, value); Dictionary<string, object> employee = new Dictionary<string, object>(); . employee.Add("Id", 1); . employee.Add("Name", "Jaimin Shethiya"); .

3. stackoverflow.com › questions › 78575501Summing dictionary values in C# - Stack Overflow

   stackoverflow.com › questions › 78575501

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   22 hours ago · yearlyResultsCO2[co].OptConcLp += (float)optResultYear.OptConcLp; // Set the date for the last entry. yearlyResultsCO2[co].Datum = date; The values on the right (the optResultYear.) do have values, and they are calculated as required. However, When adding them to my dictionary I only get NULL values.

4. www.geeksforgeeks.org › difference-between-hashDifference between Hashtable and Dictionary in C#

   www.geeksforgeeks.org › difference-between-hash

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   May 7, 2024 · Last Updated : 07 May, 2024. In C#, Dictionary is a generic collection which is generally used to store key/value pairs. Dictionary is defined under System.Collection.Generics namespace. It is dynamic in nature means the size of the dictionary is growing according to the need. Example:

5. csharpmaster.com › csharp-masters-guide-to-usingCSharp Master’s Guide to Using Dictionary in C# (Key-value ...

   csharpmaster.com › csharp-masters-guide-to-using

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   May 24, 2024 · Creating and Initializing a Dictionary. Creating a Dictionary in C# is straightforward. Here’s a simple example: Creating a Dictionary in C#. In above example, we create a Dictionary with string keys and integer values. We then add some key-value pairs and retrieve the value associated with a specific key. Basic Operations with Dictionary in ...

6. devblogs.microsoft.com › dotnet › array-mapping-inA beginner's guide to mapping arrays in EF Core 8 - .NET Blog

   devblogs.microsoft.com › dotnet › array-mapping-in

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   22 hours ago · Other uses of arrays. EF Core 8 allows an array of a simple type to be used in most places where a non-array simple type can be used. We have already seen how properties can be mapped to array columns. Another example is passing many values in a single parameter by passing those values as an array.

7. www.c-sharpcorner.com › article › dictionary-vs-hashDictionary vs HashTable in .NET C# - C# Corner

   www.c-sharpcorner.com › article › dictionary-vs-hash

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   May 8, 2024 · Explore the differences between Dictionary and HashTable in .NET C#. Learn about efficient key-value storage, hashing techniques, and performance contrasts. Discover when to use Dictionary&lt;TKey, TValue&gt; for type safety and modern features versus HashTable for legacy support.

8. en.wikipedia.org › wiki › C_Sharp_syntaxC Sharp syntax - Wikipedia

   en.wikipedia.org › wiki › C_Sharp_syntax

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   6 days ago · A C# application consists of classes and their members. Classes and other types exist in namespaces but can also be nested inside other classes. Main method. Whether it is a console or a graphical interface application, the program must have an entry point of some sort. The entry point of the C# application is the method called Main. There can ...