How do I iterate through a dictionary in C#?

How do I iterate through a dictionary in C#?

You can use a foreach loop to iterate through a dictionary. Here's an example:

Dictionary<string, int> myDict = new Dictionary<string, int>();
myDict.Add("apple", 1);
myDict.Add("banana", 2);

foreach (var kvp in myDict)
{
    Console.WriteLine($"Key: {kvp.Key}, Value: {kvp.Value}");
}

Can I use LINQ to iterate through a dictionary?

Yes, you can use LINQ for more complex queries. For example:

var result = myDict.Where(kvp => kvp.Value > 1);
foreach (var kvp in result)
{
    Console.WriteLine($"Key: {kvp.Key}, Value: {kvp.Value}");
}

What if I want to modify the values while iterating?

You should avoid modifying the dictionary while iterating through it. Instead, you can create a new dictionary or collect changes in a separate list and apply them after the iteration.

Are there any performance considerations when iterating through large dictionaries?

Yes, the performance can vary based on the size of the dictionary and the operations you perform. Generally, accessing elements by key is O(1), but iterating through all elements is O(n). For large datasets, consider the efficiency of your operations.