How to create a thread with multiple parameters?

Question

I have this function

static void appUpdater(string appName, string proccessName)
{
    /**/
}

I need to create a thread for each of the applications update, but ThreadStart and ParameterizedThreadStart do not match delegate

Thread wms = new Thread(new ParameterizedThreadStart(appUpdater));
wms.Start("WMS","StuMenu");

@MatthewWatson I'm new to c#, how would i use task instead ? how do they differ ? — H DA, Jul 04 '18 at 09:43
Yes you should be using `Task` instead: `var task = Task.Run(() => appUpdater("WMS", "StuMenu"));` Also, [the difference between Thread and Task](https://stackoverflow.com/questions/4130194/what-is-the-difference-between-task-and-thread). — Matthew Watson, Jul 04 '18 at 09:45
Why not use the [.NET thread pool](https://docs.microsoft.com/en-us/dotnet/standard/threading/the-managed-thread-pool)? — Uwe Keim, Jul 04 '18 at 10:42

score 1 · Accepted Answer · answered Jul 04 '18 at 10:39

1

You can make it super easy by just doing this:

Thread wms = new Thread(() => appUpdater("WMS", "StuMenu"));
wms.Start();

Alternatively, use a Task - tasks are more modern and you'll find built in language support for doing clever things with them. Don't learn threads, learn tasks.

Task t = Task.Run(() => appUpdater("WMS", "StuMenu"));

answered Jul 04 '18 at 10:39

Enigmativity

105,241
11
83
163

How does suggesting to use a Task answers the OP's question? – Uwe Keim Jul 04 '18 at 10:57
1

It shows how to start a thread/task without parameters, but still calls the method, that the OP wants to call, with parameters. – Enigmativity Jul 04 '18 at 10:58

derpirscher · Answer 2 · 2018-07-04T10:35:48.960

You can't. Thread.Start() only accepts one parameter of type object. But you could for instance pass a custom object or a dictionary instead

Object:

class ThreadParameters {
    public string p1 {get;set;}
    public string p2 {get;set;}
}

static void appUpdater(object p) {
    ThreadParameters tp = p as ThreadParameters;
}

Thread wms = new Thread(new ParameterizedThreadStart(appUpdater));
wms.Start(new ThreadParameters{p1="p1", p2= "p2"});

Dictionary:

static void appUpdater(object p) {
    Dictionary<string, object> tp = p as Dictionary<string, object>;
}

Thread wms = new Thread(new ParameterizedThreadStart(appUpdater));
wms.Start(new Dictionary<string, object>{{"p1", "p1"}, {"p2", "p2}});

But depending on what your needs are, a Task may be the better way.

@FCin yes, too deep into typescript right at the moment. updated . thx — derpirscher, Jul 04 '18 at 10:37

How to create a thread with multiple parameters?

2 Answers2