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I generally use a foreach loop to iterate through Dictionary.
Dictionary<string, string> dictSummary = new Dictionary<string, string>(); In this case I want to trim the entries of white space and the foreach loop does however not allow for this.
foreach (var kvp in dictSummary) { kvp.Value = kvp.Value.Trim(); } How can I do this with a for loop?
for (int i = dictSummary.Count - 1; i >= 0; i--) { } 
892
You can loop through a dictionary by using a for loop. When looping through a dictionary, the return value are the keys of the dictionary, but there are methods to return the values as well.
In Python, to iterate the dictionary ( dict ) with a for loop, use keys() , values() , items() methods. You can also get a list of all keys and values in the dictionary with those methods and list() . Use the following dictionary as an example. You can iterate keys by using the dictionary object directly in a for loop.
When you iterate through dictionaries using the for .. in .. -syntax, it always iterates over the keys (the values are accessible using dictionary[key] ). To iterate over key-value pairs, use the following: for k,v in dict.
what about this?
for (int i = dictSummary.Count - 1; i >= 0; i--) { var item = dictSummary.ElementAt(i); var itemKey = item.Key; var itemValue = item.Value; } KeyValuePair<TKey, TValue> doesn't allow you to set the Value, it is immutable.
You will have to do it like this:
foreach(var kvp in dictSummary.ToArray()) dictSummary[kvp.Key] = kvp.Value.Trim(); The important part here is the ToArray. That will copy the Dictionary into an array, so changing the dictionary inside the foreach will not throw an InvalidOperationException.
An alternative approach would use LINQ's ToDictionary method:
dictSummary = dictSummary.ToDictionary(x => x.Key, x => x.Value.Trim()); If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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