How to iterate through Dictionary and change values?

Question

Dictionary<string,double> myDict = new Dictionary(); //... foreach (KeyValuePair<string,double> kvp in myDict)  {      kvp.Value = Math.Round(kvp.Value, 3); }

I get an error: "Property or indexer 'System.Collections.Generic.KeyValuePair.Value' cannot be assigned to -- it is read only."
How can I iterate through myDict and change values?

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