Pfthb

I wanna declare new extension method which similar to List.ForEach Method.

What I wanna archive:

var dict = new Dictionary<string, string>()

 "K1", "V1" ,
 "K2", "V2" ,
 "K3", "V3" ,
;


dict.ForEach((x, y) => 

 Console.WriteLine($"(Key: x, value: y)");
);

How can I do that?

You can write an extension method easily:

public static class LinqExtensions

 public static void ForEach<TKey, TValue>(this Dictionary<TKey, TValue> dictionary, Action<TKey, TValue> invoke)
 
 foreach(var kvp in dictionary)
 invoke(kvp.Key, kvp.Value);
 

Using like this:

dict.ForEach((x, y) => 

 Console.WriteLine($"(Key: x, value: y)");
);

Produces

Key: K1, value: V1
Key: K2, value: V2
Key: K3, value: V3

Try the following:

var dict = new Dictionary<string, string>()

 "K1", "V1" ,
 "K2", "V2" ,
 "K3", "V3" ,
;

foreach(KeyValuePair<string, string> myData in dict )

 // Do something with myData.Value or myData.Key

This is the extension method:

public static void ForEach<TKey, TValue>(this Dictionary<TKey, TValue> dictionary, Action<TKey, TValue> invokeMe)

 foreach(var keyValue in dictionary)
 
 invokeMe(keyValue.Key, keyValue.Value);
 

1: Extension methods must be declared in a non-nested, non-generic, static class.

2: The 1st parameter must be annotated with the this keyword.

public static class DictionaryExtensions

 public static void ForEach<TKey, TValue>(
 this Dictionary<TKey, TValue> dictionary,
 Action<TKey, TValue> action) 

 foreach (KeyValuePair<TKey, TValue> pair in dictionary) 
 action(pair.Key, pair.Value);
 
 

This method can then be called as if it were a regular instance method:

dict.ForEach((key, value) =>
 Console.WriteLine($"(Key: key, Value: value)"));

var dic = new Dictionary<string, string>();
dic.Add("hello", "bob");
dic.Foreach(x =>

 Console.WriteLine(x.Key + x.Value);
);


public static void Foreach<T, TY>(this Dictionary<T, TY> collection, Action<T, TY> action)

 foreach (var kvp in collection)
 
 action.Invoke(kvp.Key, kvp.Value);