Iterating a dictionary in C#

Iterating a dictionary in C#

In C#, you can iterate through a dictionary using a foreach loop, which allows you to access each key-value pair in the dictionary.

Here's an example of how to iterate through a dictionary in C#:

Dictionary<string, int> myDictionary = new Dictionary<string, int>(); myDictionary.Add("Apple", 5); myDictionary.Add("Banana", 2); myDictionary.Add("Cherry", 7); foreach (KeyValuePair<string, int> entry in myDictionary) { Console.WriteLine("Key: {0}, Value: {1}", entry.Key, entry.Value); }

In this example, we have a dictionary called myDictionary with three key-value pairs. We use a foreach loop to iterate through the dictionary and print out each key-value pair.

Inside the foreach loop, we use a KeyValuePair<string, int> object called entry to access the current key-value pair in the dictionary. We then use the Key and Value properties of the entry object to print out the key and value of each pair.

By iterating through a dictionary in C# using a foreach loop, you can easily access each key-value pair in the dictionary and perform operations on them as needed.

Examples

  1. "C# dictionary iteration using foreach loop"

    • Description: Iterate through all key-value pairs in a C# dictionary using a foreach loop.
    • Code:
      foreach (var kvp in myDictionary) { Console.WriteLine($"Key: {kvp.Key}, Value: {kvp.Value}"); }

  2. "Iterating over keys in a C# dictionary"

    • Description: Retrieve and iterate over all keys in a C# dictionary using the Keys property.
    • Code:
      foreach (var key in myDictionary.Keys) { Console.WriteLine($"Key: {key}, Value: {myDictionary[key]}"); }

  3. "C# dictionary iteration with LINQ"

    • Description: Use LINQ to iterate through a C# dictionary and perform specific operations.
    • Code:
      foreach (var kvp in myDictionary.Where(kvp => kvp.Value > 10)) { Console.WriteLine($"Key: {kvp.Key}, Value: {kvp.Value}"); }

  4. "Iterating a sorted dictionary in C#"

    • Description: Iterate through a sorted C# dictionary to maintain a specific order.
    • Code:
      foreach (var kvp in mySortedDictionary) { Console.WriteLine($"Key: {kvp.Key}, Value: {kvp.Value}"); }

  5. "C# dictionary iteration with for loop"

    • Description: Use a for loop to iterate through a C# dictionary for more control over the iteration process.
    • Code:
      var keys = myDictionary.Keys.ToList(); for (int i = 0; i < keys.Count; i++) { Console.WriteLine($"Key: {keys[i]}, Value: {myDictionary[keys[i]]}"); }

  6. "Recursive iteration of nested dictionaries in C#"

    • Description: Iterate through nested dictionaries in C# using a recursive approach.
    • Code:
      void IterateNestedDictionary(Dictionary<string, object> nestedDict) { foreach (var kvp in nestedDict) { if (kvp.Value is Dictionary<string, object> nested) { IterateNestedDictionary(nested); } else { Console.WriteLine($"Key: {kvp.Key}, Value: {kvp.Value}"); } } }

  7. "Filtering dictionary items based on a condition in C#"

    • Description: Iterate through a dictionary and filter items based on a specified condition.
    • Code:
      foreach (var kvp in myDictionary.Where(kvp => kvp.Value.ToString().Contains("filterCriteria"))) { Console.WriteLine($"Key: {kvp.Key}, Value: {kvp.Value}"); }

  8. "Iterating a C# dictionary in reverse order"

    • Description: Iterate through a C# dictionary in reverse order, starting from the last item.
    • Code:
      var reverseEnumerator = myDictionary.Reverse().GetEnumerator(); while (reverseEnumerator.MoveNext()) { var kvp = reverseEnumerator.Current; Console.WriteLine($"Key: {kvp.Key}, Value: {kvp.Value}"); }

  9. "Using foreach with KeyValuePair in C#"

    • Description: Demonstrate the usage of foreach loop with KeyValuePair for dictionary iteration.
    • Code:
      foreach (KeyValuePair<string, int> kvp in myDictionary) { Console.WriteLine($"Key: {kvp.Key}, Value: {kvp.Value}"); }

  10. "Parallel iteration of a C# dictionary"

    • Description: Iterate through a C# dictionary in parallel to improve performance.
    • Code:
      Parallel.ForEach(myDictionary, kvp => { Console.WriteLine($"Key: {kvp.Key}, Value: {kvp.Value}"); });

More Tags

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