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

   • 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.

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     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);-

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     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. stackoverflow.com › questions › 4233536C# Store functions in a Dictionary - Stack Overflow

   stackoverflow.com › questions › 4233536

   • Cached

   Like this: Dictionary<int, Func<string, bool>>. This allows you to store functions that take a string parameter and return boolean. dico[5] = foo => foo == "Bar"; Or if the function is not anonymous: dico[5] = Foo; where Foo is defined like this: public bool Foo(string bar) {.

3. learn.microsoft.com › en-us › dotnetDictionary<TKey,TValue> Class (System.Collections.Generic)

   learn.microsoft.com › en-us › dotnet

   • Cached

   Dictionary<String^, String^>::ValueCollection^ valueColl = openWith->Values; // The elements of the ValueCollection are strongly typed // with the type that was specified for dictionary values. Console::WriteLine(); for each( String^ s in valueColl ) { Console::WriteLine("Value = {0}", s); } // To get the keys alone, use the Keys property.

4. startdebugging.net › 2023 › 08.NET 8 performance: Dictionary vs. FrozenDictionary

   startdebugging.net › 2023 › 08

   • Cached

   Aug 5, 2023 · Performance impact on creation. For this test, we take 10.000 pre-instantiated KeyValuePair<string, string> and create three different types of dictionaries: a normal dictionary: new Dictionary(source) a frozen dictionary: source.ToFrozenDictionary(optimizeForReading: false)

5. zetcode.com › csharp › dictionaryC# Dictionary - working with a Dictionary collection in C#

   zetcode.com › csharp › dictionary

   • Cached

   Jul 5, 2023 · C# Dictionary tutorial shows how to work with a Dictionary collection in C#. A dictionary, also called an associative array, is a collection of unique keys and a collection of values, where each key is associated with one value.

6. kenslearningcurve.com › tutorials › usingUsing dictionaries in C# with examples - Tutorial

   kenslearningcurve.com › tutorials › using

   • Cached

   Dec 30, 2022 · written by Kens Learning Curve December 30, 2022. Dictionaries in C# are collections of keys, values, and a well-used class. I’ll show you the class’s basics in this tutorial with examples. I’ll explain what a dictionary is, what it’s used for, and how we use them.

7. www.gyata.ai › c-sharp › c-sharp-dictionaryMastering C# Dictionary: A Comprehensive Guide

   www.gyata.ai › c-sharp › c-sharp-dictionary

   • Cached

   Dec 8, 2023 · Dictionary in C# can be seen as a hash table or a hash map. It uses the key to access the element in the map. In C#, a Dictionary is defined in the System.Collections.Generic namespace. Here is how you can create a simple dictionary: // Creating a dictionary Dictionary myDictionary = new Dictionary (); Adding Elements to a Dictionary

8. stackoverflow.com › questions › 55430158C# - Define a dictionary of generic functions - Stack Overflow

   stackoverflow.com › questions › 55430158

   • Cached

   Apr 1, 2019 · How do i define a dictionary that maps a Type to a function that takes this type as input. Something like: var stringifiers = new Dictionary<Type, Func<T, string>> { { typeof(string), s => s}, { typeof(float), f => f.ToString()}, { typeof(bool), b => b.ToString()}, }; usage : stringifiers[bar.getType()](bar)