C# Select List Containing Element Equaling Value-CodePudding

I have a QuickType JSON repository where I save data that I grab from an API. I've figured out how to loop through the list showing elements from each "entry", however I have a hard time figuring out how to select a specific entry that contains a specific value for a property.

Example: I have a list

public List<Robot> Robots

The class Robot is as following (showing only a few properties):

public partial class Robot
{
    [JsonProperty("id")]
    public string Id { get; set; }

    [JsonProperty("activity_text")]
    public string ActivityText { get; set; }
}

The API contains data for two Robots. After I receive the data from the API, I would have two different lists, and both of these lists have their own values for each property.

My question is, how would I select a list depending on, for example, which ID the list contains? If the JsonProperty ID equals 1 I select the specific list which contains the ID I was looking for, since I would need the values for that specific Robot's ID.

I've used this code previously to loop through the lists and output the information in each one:

foreach (var robots in result.Result.Robots)
{
    Console.WriteLine("Robot ID: "   robots.Id);
    Console.WriteLine("Activity: "   robots.ActivityText);
}

How would I go about this? I feel like my brain is fried from all of the Googling.

CodePudding user response：

This expands on what Paul commented, but as you said you don't know what that code does.

I will try to show you with code and comments:

// Get the first robot where Id equals to "1", if it exists
var matchingRobot = result.Result.Robots.FirstOrDefault(r => r.Id == "1");
// Check if the matchingRobot exists
if(matchingRobot != null){
    // Now we know it exists, we can access the property ActivityText
    Console.WriteLine("Robot with Id 2 has activity text: "   matchingRobot.ActivityText);
}
else{
    // The robot does not exist
    Console.WriteLine("There is no robot with Id 2");
}