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1. Top results related to define maven dictionary in c#

   • Define Dictionary in struct with C#

     Top Answer

     Answered May 23, 2017 · 5 votes

     That is because the Dictionary is a reference type. You should clone it, for sample:

     class User : IClonable{ public int Id { get; set; } public Dictionary<int, double> Neg { get; set; }- public object Clone() { // define a new instance var user = new User(); // copy the properties.. user.Id = this.Id; user.Neg = this.Neg.ToDictionary(k => k.Key, v => v.Value); return user; }}

     You shouldn't use a struct in a type like this. In this link, there is a good explanation about when and how you should use a struct.

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     1/5

   • Dictionary within Dictionary in C#

     Top Answer

     Answered Dec 27, 2013 · 7 votes

     Looks like you are attempting to add the same key over and over again here:

     while (sqlDataReader.Read()){ IdName.Clear(); IdName.Add(Int64.Parse(sqlDataReader["ID"].ToString()),sqlDataReader["ACCOUNT_NAME"].ToString()); AccountTypeDic.Add(IdName, Int64.Parse(sqlDataReader["SEQUENCE_ID"].ToString()));}

     Your IdName instance is ALWAYS the same. So make sure you have different instances as keys. Basically the IdName dictionary should be declared and instantiated inside your while loop:

     while (sqlDataReader.Read()){ long id = sqlDataReader.GetInt64(sqlDataReader.GetOrdinal("ID")); string accountName = sqlDataReader.GetString(sqlDataReader.GetOrdinal("ACCOUNT_NAME")); long sequenceId = sqlDataReader.GetInt64(sqlDataReader.GetOrdinal("SEQUENCE_ID")); var idName = new Dictionary<long, string>(); idName.Add(id, accountName); // Make sure that here you don't have repetitions of idName // or the next line will bomb with the exact same exception AccountTypeDic.Add(idName, sequenceId);}

     Please don't suggest me that I should use some other data structures.

     That's exactly what everybody will suggest you when we see this thing. I have seen people using dictionaries as values, but dictionaries as keys for another dictionary, oh well.

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     2/5

   • C# Dictionary Clear() clears dictionary in dictionary

     Top Answer

     Answered Nov 30, 2012 · 1 votes

     I think I get your question now.

     When you add a reference object to a collection you are storing a reference to the object, not the value.

     What you should do is make dic1 local to the loop body.

     foreach(Type s in source){ var dic1 = new Dictionary<T1, T2>(); dic1.Add(Key1, s.Attr1); dic1.Add(Key2, s.Attr2); ... dic1.Add(KeyN, s.AttrN); dic2.Add(ind, dic1); ind++;}

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     3/5

   • Dictionary enumeration in C#

     Top Answer

     Answered Nov 15, 2011 · 94 votes

     To enumerate a dictionary you either enumerate the values within it:

     Dictionary<int, string> dic;-foreach(string s in dic.Values){ Console.WriteLine(s);}

     or the KeyValuePairs

     foreach(KeyValuePair<int, string> kvp in dic){ Console.WriteLine("Key : " + kvp.Key.ToString() + ", Value : " + kvp.Value);}-

     or the keys

     foreach(int key in dic.Keys){ Console.WriteLine(key.ToString());}-

     If you wish to update the items within the dictionary you need to do so slightly differently, because you can't update the instance while enumerating. What you'll need to do is enumerate a different collection that isn't being updated, like so:

     Dictionary<int, string> newValues = new Dictionary<int, string>() { 1, "Test" };foreach(KeyValuePair<int, string> kvp in newValues){ dic[kvp.Key] = kvp.Value; // will automatically add the item if it's not there}

     To remove items, do so in a similar way, enumerating the collection of items we want to remove rather than the dictionary itself.

     List<int> keys = new List<int>() { 1, 3 };foreach(int key in keys){ dic.Remove(key);}

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     4/5

   • 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

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     5/5

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2. stackoverflow.com › questions › 980991c# - .NET Dictionary as a Property - Stack Overflow

   stackoverflow.com › questions › 980991

   • Cached

   Mar 18, 2010 · private static Dictionary <string, string> dict = new Dictionary <string,string>(){ {"Design Matrix", "Design Case"}, {"N/A", "Other"} }; public static Dictionary <string, string> Dict { get { return dict} } This structure can be used to replace values.

   Code sample

   class Example {

     private Dictionary<int,string> _map;

     public Dictionary<int,string> Map { get { return _map; } }

     public Example() { _map = new Dictionary<int,string>(); }

   }

   See more on stackoverflow

3. learn.microsoft.com › en-us › dotnetHow to initialize a dictionary with a collection initializer - C#

   learn.microsoft.com › en-us › dotnet

   • Cached

   • Overview
   • Example
   • See also

   A Dictionary contains a collection of key/value pairs. Its Add method takes two parameters, one for the key and one for the value. One way to initialize a Dictionary , or any collection whose Add method takes multiple parameters, is to enclose each set of parameters in braces as shown in the following example. Another optio...

   See full list on learn.microsoft.com

   In the following code example, a Dictionary is initialized with instances of type StudentName. The first initialization uses the Add method with two arguments. The compiler generates a call to Add for each of the pairs of int keys and StudentName values. The second uses a public read / write indexer method of the Dictionary class:

   Note the two pairs of braces in each element of the collection in the first declaration. The innermost braces enclose the object initializer for the StudentName, and the outermost braces enclose the initializer for the key/value pair that will be added to the students Dictionary . Finally, the whole collection initializer for the dictionary is enclosed in braces. In the second initialization, the left side of the assignment is the key and the right side is the value, using an object initializer for StudentName.

   See full list on learn.microsoft.com

   •C# Programming Guide

   •Object and Collection Initializers

   See full list on learn.microsoft.com

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

   www.tutorialsteacher.com › csharp › csharp-dictionary

   • Cached

   Creating a Dictionary. You can create the Dictionary<TKey, TValue> 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.

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

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

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   Feb 16, 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.

6. 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 · If you want to know the definition of a word, you pull out your dictionary (a large book with words and definitions in it), look up the word alphabetically, and viola, there is the definition and proper spelling of the word!

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

   learn.microsoft.com › en-us › dotnet

   • Cached

   Every key in a Dictionary<TKey,TValue> must be unique according to the dictionary's equality comparer. A key cannot be null, but a value can be, if its type TValue is a reference type. Dictionary<TKey,TValue> requires an equality implementation to determine whether keys are equal.

8. www.koderhq.com › tutorial › csharpC# Dictionary Generic Collection Tutorial | KoderHQ

   www.koderhq.com › tutorial › csharp

   • Cached

   Learn about a complex data container in C# that stores elements by key/value pairing, called dictionaries. We cover how to define and initialize a dictionary, access and modify dictionary elements with the indexer or loops, remove elements as well as how to check if an item exists in a dictionary.