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1. Top results related to how to use a dictionary in c#?

   • How to use dictionary a dictionary globally in C#.

     Top Answer

     Answered Apr 25, 2017 · 1 votes

     Declare the dictionary as static. Class can remain non-static. Now, no matter how many objects of that class are created, they all will refer to same dictionary.

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     1/5

   • How to use a Tuple as a Key in a Dictionary C#

     Top Answer

     Answered Sep 07, 2018 · 15 votes

     dict[Tuple.Create(1, 1)] = "Hello";-

     or with C#7 ValueTuple:

     var dict = new Dictionary<(int, int), string>();for (int i = 0; i < 2; i++){ for (int j = 0; j < 5; j++) dict.Add((i, j), "");}dict[(1, 1)] = "Hello";

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     2/5

   • C# How to use a Dictionary to reference other Dictionaries?

     Top Answer

     Answered Dec 28, 2019 · 4 votes

     I changed dynamic to the actual definition of the language dictionaries and then added the variables not strings.

     // reference dictionary - pass LangID string to reference appropriate dictionary public static Dictionary<string, Dictionary<string, string>> myDictionaries = new Dictionary<string, Dictionary<string, string>>() { { "EN", EN_Dictionary }, { "FR", FR_Dictionary }, { "DE", DE_Dictionary } }; public static Dictionary<string, string> EN_Dictionary = new Dictionary<string, string>() { { "str1", "Some text in EN" }, { "str2", "Some text in EN" }, { "str3", "Some text in EN" } }; public static Dictionary<string, string> FR_Dictionary = new Dictionary<string, string>() // FR language dictionary { { "str1", "Some text in FR" }, { "str2", "Some text in FR" }, { "str3", "Some text in FR" } }; public static Dictionary<string, string> DE_Dictionary = new Dictionary<string, string>() // DE language dictionary { { "str1", "Some text in DE" }, { "str2", "Some text in DE" }, { "str3", "Some text in DE" } };

     To use your reference dictionary...

     private void button1_Click(object sender, EventArgs e) { string LangID = "DE"; Dictionary<string, string> GermanDictionary = myDictionaries[LangID]; string PhraseID = "str2"; string GermanPhrase = GermanDictionary[PhraseID]; }

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     3/5

   • How to modify key in a dictionary in C#

     Top Answer

     Answered Mar 19, 2013 · 51 votes

     As Jason said, you can't change the key of an existing dictionary entry. You'll have to remove/add using a new key like so:

     // we need to cache the keys to update since we can't// modify the collection during enumerationvar keysToUpdate = new List<int>();-foreach (var entry in dict){ if (entry.Key < MinKeyValue) { keysToUpdate.Add(entry.Key); }}foreach (int keyToUpdate in keysToUpdate){ SortedDictionary<string, List<string>> value = dict[keyToUpdate]; int newKey = keyToUpdate + 1; // increment the key until arriving at one that doesn't already exist while (dict.ContainsKey(newKey)) { newKey++; } dict.Remove(keyToUpdate); dict.Add(newKey, value);}

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     4/5

   • How to use a C# DLL in a C application?

     Top Answer

     Answered Nov 30, 2021 · 0 votes

     Here is a simple example with 3 files

     • DLL in C#
     • interface program in C++/CLR
     • main program in C++

     First the C# DLL. This will be built as a DLL.

     using System;using System.Collections.Generic;using System.Text;namespace csdll{ public class ReturnValues { public void CSGetInt(ref int x) { x = 42; } public void CSGetStr(ref string s) { s = "Hey it works"; } }}

     Now the interface program. This is the glue logic. This has to be compiled as C++/CLR but can be in the same project as main: just not in the same file as it has to be compiled differently. Under General in Common Language Runtime Support, select Common Language Runtime Support (/clr).

     #include <string>#include <msclr\marshal_cppstd.h>#using "csdll.dll"using namespace System;extern void cppGetInt(int* value){ csdll::ReturnValues^ rv = gcnew csdll::ReturnValues(); rv->CSGetInt(*value);}extern void cppGetStr(std::string& value){ System::String^ csvalue; csdll::ReturnValues^ rv = gcnew csdll::ReturnValues(); rv->CSGetStr(csvalue); value = msclr::interop::marshal_as<std::string>(csvalue);}

     Now the main program.

     #include "stdafx.h"#include <iostream>#include <string>// These can go in a headerextern void cppGetInt(int* value);extern void cppGetStr(std::string& value);int _tmain(int argc, _TCHAR* argv[]){ int value = 99; std::string svalue = "It does not work"; cppGetInt(&value); std::cout << "Value is " << value << std::endl; cppGetStr(svalue); std::cout << "String value is " << svalue << std::endl; return 0;}

     Set the dependency to the DLL. Set the build platform to Mixed Platforms not win32 or any CPU. If it is set to any of those, something won't build. Run it and you will get

     Value is 42String value is Hey it works

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     5/5

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2. www.tutorialsteacher.com › csharp › csharp-dictionaryC# Dictionary - TutorialsTeacher.com

   www.tutorialsteacher.com › csharp › csharp-dictionary

   • Cached

   //numberNames.Add(3, "Three"); foreach (KeyValuePair < int, string > kvp in numberNames) Console.WriteLine("Key: {0}, Value: {1}", kvp.Key, kvp.Value); //creating a dictionary using collection-initializer syntax var cities = new Dictionary < string, string >(){ {"UK", "London, Manchester, Birmingham"}, {"USA", "Chicago, New York, Washington ...

3. www.geeksforgeeks.org › c-sharp-dictionary-withC# Dictionary with examples - GeeksforGeeks

   www.geeksforgeeks.org › c-sharp-dictionary-with

   • Cached

   Feb 16, 2023 · Syntax: using System.Collections.Generic; Step 2: Create a Dictionary using Dictionary<TKey, TValue> class as shown below: Dictionary dictionary_name = new Dictionary(); Step 3: If you want to add elements in your Dictionary then use Add () method to add key/value pairs in your Dictionary.

4. People also ask

   How to create a dictionary in C#?

   • To create a dictionary in C#, we need to use the System.Collections.Generic namespace. Here is how we can create a dictionary in C#. Here, using System.Collections; class Program public static void Main() Dictionary< int, string > country = new Dictionary< int, string >(); country.Add(5, "Brazil");

   C# Dictionary (With Examples) - Programiz

   www.programiz.com/csharp-programming/dictionary

   See all results for this question

   How do I create a dictionary?

   • To create a dictionary, you need to specify the object type for both the key and value. Create the dictionary. In this example, the key is an integer and the value for each record is a string. You’ll need to use the System.Collections.Generic namespace which contains the Dictionary class. Ensure you do so at the top of your file:

   How to Use a Dictionary in C# - MUO

   www.makeuseof.com/c-sharp-dictionary-usage/

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   What is a dictionary class in C#?

   • C# Dictionary class constructor takes a key data type and a value data type. Both types are generic, so they can be any .NET data type. The following Dictionary class is a generic class and can store any data type. This class is defined in the code snippet and creates a dictionary where both keys and values are string types.

   Dictionary In C# - C# Corner

   www.c-sharpcorner.com/uploadfile/mahesh/dictionary-in-C-Sharp/

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   What is a dictionary class?

   • The Dictionary class is defined in the System.Collections.A generic namespace is a class that can store any data type in keys and values. Each key must be unique in the collection. Before you use the Dictionary class in your code, you must import the System.Collections.Generic namespace using the following line.

   Dictionary In C# - C# Corner

   www.c-sharpcorner.com/uploadfile/mahesh/dictionary-in-C-Sharp/

   See all results for this question

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

   learn.microsoft.com › en-us › dotnet

   • Cached

   Console.WriteLine(); foreach( KeyValuePair<string, string> kvp in openWith ) { Console.WriteLine("Key = {0}, Value = {1}", kvp.Key, kvp.Value); } // To get the values alone, use the Values property. Dictionary<string, string>.ValueCollection valueColl = openWith.Values; // The elements of the ValueCollection are strongly typed // with the type ...

   Code sample

   Dictionary<string, string> openWith =

     new Dictionary<string, string>();

   openWith.Add("txt", "notepad.exe");

   openWith.Add("bmp", "paint.exe");

   openWith.Add("dib", "paint.exe");...

   See more on Microsoft Docs

6. www.programiz.com › csharp-programming › dictionaryC# Dictionary (With Examples) - Programiz

   www.programiz.com › csharp-programming › dictionary

   • Cached

   public static void Main() {. // create a dictionary. Dictionary<string, string> car = new Dictionary<string, string>(); // add items to dictionary. car.Add("Model", "Hyundai"); car.Add("Price", "36K"); // print the original value. Console.WriteLine("Value of Model before changing: " + car["Model"]);

7. www.makeuseof.com › c-sharp-dictionary-usageHow to Use a Dictionary in C# - MUO

   www.makeuseof.com › c-sharp-dictionary-usage

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   May 14, 2022 · How to Use a Dictionary in C# By Shay Lynn Khan. Published May 14, 2022. Get all the important details on how to use this powerful data structure. A dictionary is a useful data structure that allows you to store key-value pairs. You can efficiently access a value from the dictionary using its key.

   • Occupation: Staff Writer For Programming

8. www.c-sharpcorner.com › dictionary-in-C-SharpDictionary In C# - C# Corner

   www.c-sharpcorner.com › dictionary-in-C-Sharp

   • Cached

   Aug 25, 2023 · To create a dictionary in C#, you use the Dictionary<TKey, TValue> class, where TKey is the type of the keys, and TValue is the type of the values. For example, the following code creates a dictionary that can store strings as keys and integers as values: Dictionary<string, int> dictionary = new Dictionary<string, int> ();

9. 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.