CODEWITHSUNDEEP
c#classobjectqueue
ChanceSQ
ChanceSQ

Reputation: 15

How to place and access an object of type class within a queue

So basically I have a Job class

public class Job
{
   private string id;               
   private int numBytes;           
   private int requiredTime; 
}

within my main i receive values and create the job

var aJob = new Job();
Queue jobQueue = new Queue();

I want to be able to take the job info out of the queue as a job again

Job test = new Job();           
test = (Job)jobQueue.Peek();

however when I print it out I recieve "Job"

Console.WriteLine(test);

I've also recieved a compiler error when I use:

test = jobQueue.Peek();
Error 1 Cannot implicitly convert type 'object' to 'Job'. An explicit conversion exists     
(are you missing a cast?)

basically the goal here is to store jobs in a queue and access the job's individual properties.

much thanks!

Upvotes: 0

Views: 715

Answers (3)

Todd Li
Todd Li

Reputation: 3269

First, you'll want to use a Queue<Job>. The non-generic version is for old versions of .Net Framework which you shouldn't use for new code any more.

Second, you can't print the properties (they are not called attributes) of a custom class just by calling Console.WriteLine(). You'll need to print them individually, like:

Console.WriteLine("Id = {0}", test.id);
Console.WriteLine("numBytes = {0}", test.numBytes);
Console.WriteLine("requiredTime = {0}", test.requiredTime);

Or override the ToString() method like described by the other answer.

Upvotes: 1

ProgramFOX
ProgramFOX

Reputation: 6390

First of all, use a Queue<T> instead of a Queue.

Then, override the ToString() method of your Job class:

public override string ToString()
{
     return string.Format("id: {0}, numBytes: {1}, requiredTime: {2}", id, numBytes, requiredTime);
}

And then, after taking the job info from the queue, use the ToString() method to print out the information:

Job test = new Job();           
test = jobQueue.Peek(); // casting isn't longer necessary, because you use a Queue<T>
Console.WriteLine(test.ToString());

Upvotes: 0

dahlbyk
dahlbyk

Reputation: 77540

You want to use the generic queue instead:

Queue<Job> jobQueue = new Queue<Job>();

You see "Job" printed because you did not override ToString().

Upvotes: 1

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