async and Tuple-CodePudding

I am trying to get my head around tuple for the first time using it in an async function. When testing I am not able to catch the response. I have been google the problem but not been able t solve it.

I want to run an async function that return three strings. I am not able to catch the response. Have tried referencing item or the name.

Here is the code:

var _moonAndSunResult = CleanSunAndMoonJson(_moonJson);
print(_moonAndSunResult);

Tried referencing the _moonAndSunResult in different ways.

// async Task<Tuple<string, string, string, string>> CleanSunAndMoonJson(string _json)
async Task<(string, string, string, string)> CleanSunAndMoonJson(string _json)
{

    print("sunRise: "   GetCorrectTimeFormat("sunRise", _json));
    print("sunSet: "   GetCorrectTimeFormat("sunSet", _json));
    print("moonRise: "   GetCorrectTimeFormat("moonRise", _json));
    print("moonSet: "   GetCorrectTimeFormat("moonSet", _json));

    Utility.sunrise = GetCorrectTimeFormat("sunRise", _json);
    Utility.sunset = GetCorrectTimeFormat("sunSet", _json);
    Utility.moonrise = GetCorrectTimeFormat("moonRise", _json);
    Utility.moonset = GetCorrectTimeFormat("moonSet", _json);



    await Task.Yield();

    //return (firstValue, secondValue, thirdValue);

    //return new Tuple<string, string, string, string>(Utility.sunrise, Utility.sunset, Utility.moonrise, Utility.moonset);
    return (Utility.sunrise, Utility.sunset, Utility.moonrise, Utility.moonset);
    //return Tuple.Create(Utility.sunrise, Utility.sunset, Utility.moonrise, Utility.moonset);
}

I get this from the _moonAndSunResult print above

System.Threading.Tasks.Task`1[System.ValueTuple`4[System.String,System.String,System.String,System.String]]

CodePudding user response：

What @YoungDeiza said (await the task), but really you don't need to use tasks here:

(string Sunrise, string Sunset, string Moonrise, string Moonset) CleanSunAndMoonJson(string _json)
{
    ...

    var sunrise = GetCorrectTimeFormat("sunRise", _json);
    var sunset = GetCorrectTimeFormat("sunSet", _json);
    var moonrise = GetCorrectTimeFormat("moonRise", _json);
    var moonset = GetCorrectTimeFormat("moonSet", _json);

    return (sunrise, sunset, moonrise, moonset);
}

then

var _moonAndSunResult = CleanSunAndMoonJson(_moonJson);

CodePudding user response：

You need to await the asynchronous method:

public static async Task Main()
{
    var _moonAndSunResult = await CleanSunAndMoonJson(_moonJson);
    print(_moonAndSunResult);
}

If you do not await it, you call print on a task not the result of the task.