I have the following code in c# , basically its a simple dictionary with some keys and their values . now i want to update the existing key in this dictionary with new key.. How to update the value stored in dictionary in c#? ask question. up vote 341 down vote favorite. 34. how to update value for a specific key in a dictionary dictionary<string it will add that key to the dictionary with the value provided. += will not work on a non-existing key though, since it is just syntactic sugar for dic[key] = value. It is very costly to iterate over dictionary x. assume x is very large. it is very costly to make an update to {key, value} pair so the task is to minimize this cost. so that was the problem stated. here is my solution: first idea i had was to save the dictionary u after updating x. on the next update i take each key from uprev and set it to 0.
How to update a value in dictionary based on key in c#. rate this: please sign up or sign in to vote. see more: c#. wpf. dictionary. hi all, can any one give me a sample how to update a value in dictionary based upon the key. i have a collection of frames in a dictionary how to update value of dictionary with specific key in c#.. Uses the specified functions to add a key/value pair to the concurrentdictionary<tkey,tvalue> if the key does not already exist, or to update a key/value pair in the concurrentdictionary<tkey,tvalue> if the key already exists.. Examples. the following code example creates an empty dictionary<tkey,tvalue> of strings with string keys and uses the add method to add some elements. the example demonstrates that the add method throws an argumentexception when attempting to add a duplicate key.. this code example is part of a larger example provided for the dictionary<tkey,tvalue> class..
