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1. Top results related to how do i create a dictionary in c#?

   • How do I create a Dictionary that holds different types in C#

     Top Answer

     Answered Nov 05, 2010 · 95 votes

     Well, you could use Dictionary<string, dynamic> in C# 4 / .NET 4 - but other than that, you can't do it with exactly the code shown because there's no type which is implicitly convertible to int, string and double. (You could write your own one, but you'd have to list each type separately.)

     You could use Dictionary<string, object> but then you'd need to cast the results:

     int a = (int) Storage.Get("age");string b = (string) Storage.Get("name");double c = (double) Storage.Get("bmi");

     Alternatively, you could make the Get method generic:

     int a = Storage.Get<int>("age");// etc

     Other Answers

     Answered Mar 07, 2017 · 34 votes

     You could declare a Dictionary containing just the type object and then cast your results; .e.g.

     Dictionary<string, object> storage = new Dictionary<string,object>();storage.Add("age", 12);storage.Add("name", "test");storage.Add("bmi", 24.1);int a = (int)storage["age"];string b = (string)storage["name"];double c = (double)storage["bmi"];

     However, this isn't that elegant. If you know you are always going to be storing age, name, bmi I would create an object to encapsulate those and store that instead. E.g.

     public class PersonInfo{ public int Age { get; set; } public string Name { get; set; } public double Bmi { get; set; }}

     And then use that insead of the Dictionary... e.g.

     PersonInfo person1 = new PersonInfo { Name = "test", Age = 32, Bmi = 25.01 };int age = person1.Age;

     etc.

     Other Answers

     Answered Jul 18, 2023 · 13 votes

     Why not use:

     Dictionary<string, object>

     You can create an extension method to cast values when you get them:

     public static class DictionaryExtensions{ public static T Get<T>(this Dictionary<string, object> instance, string name) { return (T)instance[name]; }}var age = dictionary.Get<int>("age");

     Check all answers on Stack Overflow

     1/5

   • How do I create a HashCode in .net (c#) for a string that is safe to store in a database?

     Top Answer

     Answered Mar 01, 2011 · 86 votes

     It depends what properties you want that hash to have. For example, you could just write something like this:

     public int HashString(string text){ // TODO: Determine nullity policy.- unchecked { int hash = 23; foreach (char c in text) { hash = hash * 31 + c; } return hash; }}

     So long as you document that that is how the hash is computed, that's valid. It's in no way cryptographically secure or anything like that, but you can persist it with no problems. Two strings which are absolutely equal in the ordinal sense (i.e. with no cultural equality etc applied, exactly character-by-character the same) will produce the same hash with this code.

     The problems come when you rely on undocumented hashing - i.e. something which obeys GetHashCode() but is in no way guaranteed to remain the same from version to version... like string.GetHashCode().

     Writing and documenting your own hash like this is a bit like saying, "This sensitive information is hashed with MD5 (or whatever)". So long as it's a well-defined hash, that's fine.

     EDIT: Other answers have suggested using cryptographic hashes such as SHA-1 or MD5. I would say that until we know there's a requirement for cryptographic security rather than just stability, there's no point in going through the rigmarole of converting the string to a byte array and hashing that. Of course if the hash is meant to be used for anything security-related, an industry-standard hash is exactly what you should be reaching for. But that wasn't mentioned anywhere in the question.

     Check all answers on Stack Overflow

     2/5

   • How do I create a DataGrid in C#?

     Top Answer

     Answered Apr 09, 2009 · 3 votes

     In a winforms environment, you can bind strongly typed collections as the datasource; Each property of the objects in the collection makes a column (Strictly speaking, I believe it works out the properties for the type that the collection returns, rather than the individual items in it)

     Check all answers on Stack Overflow

     3/5

   • How do I create a MessageBox in C#?

     Top Answer

     Answered Jan 21, 2019 · 49 votes

     MessageBox.Show also returns a DialogResult, which if you put some buttons on there, means you can have it returned what the user clicked. Most of the time I write something like

     if (MessageBox.Show("Do you want to continue?", "Question", MessageBoxButtons.YesNo) == MessageBoxResult.Yes) { //some interesting behaviour here}-

     which I guess is a bit unwieldy but it gets the job done.

     See https://learn.microsoft.com/en-us/dotnet/api/system.windows.forms.dialogresult for additional enum options you can use here.

     Other Answers

     Answered Mar 07, 2017 · 34 votes

     You could declare a Dictionary containing just the type object and then cast your results; .e.g.

     Dictionary<string, object> storage = new Dictionary<string,object>();-storage.Add("age", 12);storage.Add("name", "test");storage.Add("bmi", 24.1);int a = (int)storage["age"];string b = (string)storage["name"];double c = (double)storage["bmi"];

     However, this isn't that elegant. If you know you are always going to be storing age, name, bmi I would create an object to encapsulate those and store that instead. E.g.

     public class PersonInfo{ public int Age { get; set; } public string Name { get; set; } public double Bmi { get; set; }}

     And then use that insead of the Dictionary... e.g.

     PersonInfo person1 = new PersonInfo { Name = "test", Age = 32, Bmi = 25.01 };-int age = person1.Age;-

     etc.

     Other Answers

     Answered Jul 18, 2023 · 13 votes

     Why not use:

     Dictionary<string, object>-

     You can create an extension method to cast values when you get them:

     public static class DictionaryExtensions{ public static T Get<T>(this Dictionary<string, object> instance, string name) { return (T)instance[name]; }}var age = dictionary.Get<int>("age");

     Check all answers on Stack Overflow

     4/5

   • How do I create a canvas in c#?

     Top Answer

     Answered Oct 02, 2020 · 5 votes

     You need to create a new project of correct type first. You are perhaps still creating a Console Application project. You can try WPF to create applications that have visual elements such as windows, buttons, panels, etc.

     See this tutorial for example: https://learn.microsoft.com/en-us/dotnet/desktop/wpf/getting-started/walkthrough-my-first-wpf-desktop-application?view=netframeworkdesktop-4.8

     As a side note, the code above doesn't look correct. The whole code is directly inside the class, while it should be inside a method for example.

     Check all answers on Stack Overflow

     5/5

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2. stackoverflow.com › questions › 17047602Proper way to initialize a C# dictionary with values

   stackoverflow.com › questions › 17047602

   • Cached

   With C# 6.0, you can create a dictionary in the following way: var dict = new Dictionary<string, int> { ["one"] = 1, ["two"] = 2, ["three"] = 3 }; It even works with custom types.

   Code sample

   var myDict = new Dictionary<string, string> {

     { "key1", "value1" },

     { "key2", "value2" }

   };

   Console.ReadKey();...

   See more on stackoverflow

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

   www.tutorialsteacher.com › csharp › csharp-dictionary

   • Cached

   • Dictionary Characteristics
   • Creating A Dictionary
   • Access Dictionary Elements
   • Update Dictionary
   • Remove Elements in Dictionary
   • Dictionary Class Hierarchy

   Dictionary stores key-value pairs.

   Comes under System.Collections.Genericnamespace.

   Implements IDictionary interface.

   Keys must be unique and cannot be null.

   See full list on tutorialsteacher.com

   You can create the Dictionary object by passing the type of keys and values it can store. The following example shows how to create a dictionary and add key-value pairs. In the above example, numberNames is a Dictionary type dictionary, so it can store int keys and string values. In the same way, cities is a Dictionary

   See full list on tutorialsteacher.com

   The Dictionary can be accessed using indexer. Specify a key to get the associated value. You can also use the ElementAt() method to get a KeyValuePairfrom the specified index.

   See full list on tutorialsteacher.com

   Update the value of a key by specifying a key in the indexer. It will throw the KeyNotFoundException if a key does not exist in the dictionary, therefore use the ContainsKey()method before accessing unknown keys.

   See full list on tutorialsteacher.com

   The Remove() method deletes an existing key-value pair from a dictionary. The Clear()method deletes all the elements of the dictionary.

   See full list on tutorialsteacher.com

   The following diagram illustrates the generic Dictionary class hierarchy. Learn about Dictionary methods and propertieson docs.microsoft.com.

   See full list on tutorialsteacher.com

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 add a value to a dictionary string?

   • To insert the Value into the Dictionary Dictionary dDS1 = new Dictionary ();//Declaration dDS1.Add("VEqpt", "aaaa");//adding key and value into the dictionary string Count = dDS1["VEqpt"];//assigning the value of dictionary key to Count variable dDS1["VEqpt"] = Count + "bbbb";//assigning the value to key

   Different ways of adding to a dictionary in C# - Stack Overflow

   stackoverflow.com/questions/1838476/different-ways-of-adding-to-a-dictionary-in-c-sharp

   See all results for this question

   How to create a dictionary from a list or array in C#?

   • To create a dictionary from a list or array in C#, you can use the ToDictionary method from the System.Linq namespace. This method takes a sequence of elements and a function that specifies how to create the key and value for each element. Here's an example of creating a dictionary from a list of strings:

   C# Dictionary: Complete Guide [2023] - Josip Miskovic

   josipmisko.com/posts/c-sharp-dictionary

   See all results for this question

   How to initialize a dictionary in C#?

   • To initialize a dictionary in C#, we first need to provide the type for the key and the type for the value. For example, for a dictionary that stores the name and age of a person, the initialization would be: The first type inside the angle brackets is the key type. The second type is the value type.

   C# Dictionary: Complete Guide [2023] - Josip Miskovic

   josipmisko.com/posts/c-sharp-dictionary

   See all results for this question

5. stackoverflow.com › questions › 11840319c# - How to create and populate generic Dictionary? - Stack ...

   stackoverflow.com › questions › 11840319

   • Cached

   Aug 7, 2012 · 7 Answers. Sorted by: 3. How about something like. Dictionary<string, Point> dict = new Dictionary<string, Point>() { . { "string A", new Point(0, 0) } } Just to be different from the other answers and use an object initializer. answered Aug 7, 2012 at 6:23. Eric J. 149k 64 345 557. new new Point (0, 0) - typo need to change. – Pranay Rana.

6. stackoverflow.com › questions › 1838476Different ways of adding to a dictionary in C# - Stack Overflow

   stackoverflow.com › questions › 1838476

   • Cached

   Dictionary<string, string> dDS1 = new Dictionary<string, string>();//Declaration. dDS1.Add("VEqpt", "aaaa");//adding key and value into the dictionary. string Count = dDS1["VEqpt"];//assigning the value of dictionary key to Count variable. dDS1["VEqpt"] = Count + "bbbb";//assigning the value to key.

7. www.c-sharpcorner.com › UploadFile › maheshHow to create a dictionary in C# - C# Corner

   www.c-sharpcorner.com › UploadFile › mahesh

   • Cached

   Feb 11, 2023 · The following code snippet creates a dictionary where the key type is a string, the value type is float, and the total number of items it can hold is 3. Dictionary<string, float> PriceList = new Dictionary<string, float>(3); The following code snippet adds items to the dictionary. PriceList.Add("Tea", 3.25f); . PriceList.Add("Juice", 2.76f); .

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

   www.programiz.com › csharp-programming › dictionary

   • Cached

   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#. // create a dictionary . Dictionary<dataType1, dataType2> dictionaryName = new Dictionary<dataType1, dataType2>(); Here, dictionaryName - name of the dictionary. dataType1 - datatype of keys.

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

   josipmisko.com › posts › c-sharp-dictionary

   • Cached

   Jan 26, 2023 · How do I create a dictionary from a list or array in C#? To create a dictionary from a list or array in C#, you can use the ToDictionary method from the System.Linq namespace. This method takes a sequence of elements and a function that specifies how to create the key and value for each element.