Yahoo Web Search

Search results

1. Top results related to what is a dictionary class in c# with example

   • What is a Value Class and what is a reference Class in C#?

     Top Answer

     Answered Nov 02, 2009 · 1 votes

     Value types are passed by value, while reference types are passed by reference.

     Edit: value/reference classes There is no concept of a 'value class' or 'reference class' in C#, so asking for its definition is moot.

     Other Answers

     Answered Nov 02, 2009 · 4 votes

     You may be thinking of C++/CLI which, unlike C#, allows the user to declare a "value class" or a "ref class." In C#, any class you declare will implicitly be a reference class - only built-in types, structs, and enums have value semantics. To read about value class in C++/CLI, look here: http://www.ddj.com/cpp/184401955

     Value classes have very little functionality compared to ref classes, and are useful for "plain old data"; that is, data which has no identity. Since you're copying the data when you assign one to another, the system provides you with a default (and mandatory) copy constructor which simply copies the data over to the other object.

     To convert a value class into a reference class (thereby putting it on the garbage-collected heap) you can "box" it.

     To decide whether a class you are writing is one or the other, ask yourself whether it has an identity. That usually means that it has some state, or has an identifier or a name, or a notion of its own context (for example a node pointing to nearby nodes).

     If it doesn't, it's probably a value class.

     In C#, however, value classes are declared as "structs".

     Other Answers

     Answered Nov 02, 2009 · 3 votes

     See the overview on the subject, but seriously follow the msnd links and read the full Common Type system chapter of it. (You could also have asked in a comment in the first, question)

     Check all answers on Stack Overflow

     1/5

   • What is a Control Class in C#

     Top Answer

     Answered Oct 27, 2016 · 2 votes

     Windows forms is build upon a object hierarchy. All the UI controls that use a ControlTemplate to define their appearance is inherited from Control class. In OO this type of parent class inheritance is called as base class.

     if you look at the Object Hierarchy it looks as follows

     - System.Windows.Forms.Control   -System.Windows.Forms.ScrollableControl     -System.Windows.Forms.ContainerControl        -System.Windows.Forms.Form

     So Form is a Control. Whatever Control can do Form can do it too because its inherited. Hope it clears out your question.

     Check all answers on Stack Overflow

     2/5

   • What is a base class constructor and why would I want to use it? (with Example)

     Top Answer

     Answered Aug 11, 2016 · 4 votes

     A base class constructor is used if there's some kind of initialization that's used in many different scenarios. For example, if you had something like

     public bool Abc { get; set; }-private readonly string x;-private readonly string newName;public Test(string x, string newName){ Abc = true; thix.x = x; this.newName = newName;}

     (yeah, pretty dumb example, but anyway) and you always wanted that initialization to happen you probably don't want to have to type that over and over again every time you have a new derived class. Not only would that be annoying, it would be bad from a maintenance perspective; if you had to change the logic for some reason you'd have to go to every single place where you had typed it and change it, and if you accidentally missed one you'd introduce a bug into your system.

     Note that it's possible for both the parent type and the derived type to have several constructors. For example:

     public abstract class SomeClass{ public SomeClass(string a, string b) { // ... } public SomeClass() { //... }}public SomeDerivedType : SomeClass{ public SomeDerivedType(string a, string b) : base(a, b) { // ... } public SomeDerivedType() : base("test", "string") { // .. }}

     It's perfectly valid for the base constructor and derived type constructor to have different parameters. If you think about it, that makes sense; you're calling a completely different constructor. It would, for example, be perfectly valid to do the following:

     public SomeDerivedType()...{ // The CollectionType constructor has a different number of parameters than SomeDerivedType does abc = new CollectionType<int>(1, 2, 3, 4, 5);}

     Check all answers on Stack Overflow

     3/5

   • In C# what is the difference between a destructor and a Finalize method in a class?

     Top Answer

     Answered Oct 04, 2017 · 76 votes

     A destructor in C# overrides System.Object.Finalize method. You have to use destructor syntax to do so. Manually overriding Finalize will give you an error message.

     Basically what you are trying to do with your Finalize method declaration is hiding the method of the base class. It will cause the compiler to issue a warning which can be silenced using the new modifier (if it was going to work). The important thing to note here is that you can't both override and declare a new member with identical name at the same time so having both a destructor and a Finalize method will result in an error (but you can, although not recommended, declare a public new void Finalize() method if you're not declaring a destructor).

     Check all answers on Stack Overflow

     4/5

   • What is the difference between a child of a parent class and the derived of a base class in VB.NET or C#?

     Top Answer

     Answered Oct 23, 2012 · 8 votes

     parent and child are more abstract relations. They are used to describe hierarchy, and thus can be used in all kinds of trees (or sometimes DAGs). The tree of class inheritance is one such tree, so calling them parent and child is not wrong. This terminology is often used with other kinds of trees, such as nested GUI controls, directory structures,...

     base and derived is used only for inheritance, and thus more precise. This terminology is preferred, since it's less ambiguous.

     Other Answers

     Answered Nov 02, 2009 · 4 votes

     You may be thinking of C++/CLI which, unlike C#, allows the user to declare a "value class" or a "ref class." In C#, any class you declare will implicitly be a reference class - only built-in types, structs, and enums have value semantics. To read about value class in C++/CLI, look here: http://www.ddj.com/cpp/184401955

     Value classes have very little functionality compared to ref classes, and are useful for "plain old data"; that is, data which has no identity. Since you're copying the data when you assign one to another, the system provides you with a default (and mandatory) copy constructor which simply copies the data over to the other object.

     To convert a value class into a reference class (thereby putting it on the garbage-collected heap) you can "box" it.

     To decide whether a class you are writing is one or the other, ask yourself whether it has an identity. That usually means that it has some state, or has an identifier or a name, or a notion of its own context (for example a node pointing to nearby nodes).

     If it doesn't, it's probably a value class.

     In C#, however, value classes are declared as "structs".

     Other Answers

     Answered Nov 02, 2009 · 3 votes

     See the overview on the subject, but seriously follow the msnd links and read the full Common Type system chapter of it. (You could also have asked in a comment in the first, question)

     Check all answers on Stack Overflow

     5/5

   Show moreShow less

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

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

   • Cached

   Feb 16, 2023 · Last Updated : 16 Feb, 2023. In C#, Dictionary is a generic collection which is generally used to store key/value pairs. The working of Dictionary is quite similar to the non-generic hashtable. The advantage of Dictionary is, it is generic type. Dictionary is defined under System.Collections.Generic namespace.

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

   learn.microsoft.com › en-us › dotnet

   • Cached

   The Dictionary<TKey,TValue> generic class provides a mapping from a set of keys to a set of values. Each addition to the dictionary consists of a value and its associated key. Retrieving a value by using its key is very fast, close to O(1), because the Dictionary<TKey,TValue> class is implemented as a hash table.

   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

4. People also ask

   What is a dictionary in C#?

   • In C#, Dictionary is a generic collection which is generally used to store key/value pairs. The working of Dictionary is quite similar to the non-generic hashtable. The advantage of Dictionary is, it is generic type. Dictionary is defined under System.Collections.Generic namespace.

   C# Dictionary with examples - GeeksforGeeks

   www.geeksforgeeks.org/c-sharp-dictionary-with-examples/

   See all results for this question

   What is the difference between a dictionary and a dictionary?

   • Important Points: In Dictionary, the key cannot be null, but value can be. In Dictionary, key must be unique. Duplicate keys are not allowed if you try to use duplicate key then compiler will throw an exception. In Dictionary, you can only store same types of elements. The capacity of a Dictionary is the number of elements that Dictionary can hold.

   C# Dictionary with examples - GeeksforGeeks

   www.geeksforgeeks.org/c-sharp-dictionary-with-examples/

   See all results for this question

   How to create a dictionary in C#?

   • It is recommended to keep the key simple, like a GUID or an integer. Dictionaries in C# also have known methods like Add () , Remove (), and Clear (). It also has methods specifically for a dictionary. To sum it up: It has a key, which cannot be NULL and needs to be unique. it has a value, which can be NULL and can be duplicated.

   Using dictionaries in C# with examples - Tutorial - Kens Learning Curve

   kenslearningcurve.com/tutorials/using-dictionaries-in-c/

   See all results for this question

   What types of values can be used in a dictionary object?

   • The values can also be of any type, with a few examples to follow. Here is a simple dictionary object that uses a string as a key and a string as its value. public static void Main() Dictionary< string, string > bigRedBook = new Dictionary< string, string >(); //use the Add method to add items to the dictionary

   C# Dictionary: Definition, Examples, Best Practices, and Pitfalls - SubMain

   blog.submain.com/c-dictionary-examples-practices-pitfalls/

   See all results for this question

5. blog.submain.com › c-dictionary-examples-practicesC# Dictionary: Definition, Examples, Best Practices, and Pitfalls

   blog.submain.com › c-dictionary-examples-practices

   • Cached

   Jul 10, 2018 · A C# Dictionary of a Dictionary?Simple. Here is a simple dictionary object that uses a string as a key and a string as its value. using System; using System.Collections.Generic; public class SimpleDictionary { public static void Main() { Dictionary< string, string > bigRedBook = new Dictionary< string, string >();

   • Occupation: Contributing Author

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

   kenslearningcurve.com › tutorials › using

   • Cached

   Dec 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. Table Of Contents. What Are Dictionaries In C#? Examples Of Dictionaries In C# Add. Retrieving values. Removing elements.

7. josipmisko.com › posts › c-sharp-dictionaryC# Dictionary: Complete Guide [2023] – Josip Miskovic

   josipmisko.com › posts › c-sharp-dictionary

   • Cached

   Jan 26, 2023 · C# Dictionary is a data structure that holds key-value pairs. It's called a Dictionary because the key is used to look up the corresponding value, just like in a real dictionary. The good thing is that the dictionary is a generic, so we can use it to store values of any type.

8. amarozka.dev › dictionary-data-structure-in-csharpEfficient Data Management with Dictionary in C# - .Net Code ...

   amarozka.dev › dictionary-data-structure-in-csharp

   • Cached

   Aug 16, 2023 · Usage Examples: 1. Creating a Dictionary: Dictionary<string, int> ageDictionary = new Dictionary<string, int>(); In this example, a new dictionary named ` ageDictionary ` is created to store pairs where keys are strings (representing names) and values are integers (representing ages). 2. Adding and Retrieving Elements: