How to select the elements of the collection by condition and change their values?

Question

Good afternoon, please tell me on this issue, there is a collection of values of type Sensors

public class Sensor { public SensorType SensorType { get; set; } public int RegisterAddress { get; set; } public int BitNumber { get; set; } public int Position { get; set; } public int Value { get; set; } }

How to change the Value for elements with a given SensorType?

Accepted Answer · 2016-07-30T10:43:15

 foreach (var sensor in sensors.Where(s => s.SensorType == selectedType)) sensor.Value = newValue;

If the collection is from structures (int for example), then it is better to do something like this:

  var list = new List<int>(); for (int i = 0; i < list.Count; i++) { if (someCondition) list[i] = newValue; }

It works, but could not explain why in the same situation, if the sensors are List <int>, then when you try to assign a sensor value, the compiler gives a readonly local variable error?

Zufir zufir 4,588 one eleven 29 · Answer 2 · 2016-07-30T10:45:30

 sensors=sensors.Select(x=> { x.Value=x.SensorType==selectedType?newValue:x.value; return x; });

Wow, are you seriously writing code that there is only one space for this construction?

How to select the elements of the collection by condition and change their values?

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