How to iterate through Dictionary and change values?

Question

Dictionary myDict = new Dictionary();
//...
foreach (KeyValuePair kvp in myDict)
 {
     kvp.Value = Math.Round(kvp.Value,          


        

Answer 1

According to MSDN:

The foreach statement is a wrapper around the enumerator, which allows only reading from the collection, not writing to it.

Use this:

var dictionary = new Dictionary();
// TODO Populate your dictionary here
var keys = new List(dictionary.Keys);
foreach (string key in keys)
{
   dictionary[key] = Math.Round(dictionary[key], 3);
}