Alter/modify data from an existing keyValuePair

Question

I have this

foreach (KeyValuePair<string, Object> tempData in tempList.ToDictionary(x => x.Key, y => y.Value))
{        
    tempData["fahrzeugA"] = "s";
}

But using tempData["fahrzeugA"] = "s"; will not work.

I get:

Cannot apply indexing with [] to an expression of type 'System.Collections.Generic.KeyValuePair'

What is the correct syntax if I have an existing key fahrzeugA, which I want to alter ?

Answer 1

You can apply this :

 var tempList = new List<Test>();
 var dic = tempList.ToDictionary(x => x.Key, y => y.Value);
 foreach (var tempData in dic)
 {
      dic[tempData.Key] = "s";
 }

Answer 2

You can't change the key value pair since it is an immutable struct. The only way to change it is to create a new instance. That instance would live independent from the dictionary.

If you want to change the value in the dictionary, use the indexer property on the dictionary to change the value.

And even then, the dictionary will go out of scope immediately, so there is no use setting it. It won't affect the original list.