异步方法不返回字符串

Question

I am trying to get some weather data from Open Weather Maps and l use HTTPClient and API ASP.NET in C#. My code keeps returning:

System.Threading.Tasks.Task`1[System.String]

I've made my methods async and await but I still get the above returned. I thought making it await would return the value.

I am just trying to get the string from Open Weather Maps, I'll worry about parsing it to JSON once I have this working. Here is my code, "MY_APPID" is replaced with my API key, I just removed it here.

My main:

private async Task<string> GetLocationJson()
    {
        const string APPID = "(MY_APPID)";
        const string LOCATIONID = "2172797";
        string jsonAsString = ""; 
        string callStringJson = "api.openweathermap.org/data/2.5/weather?id=" + LOCATIONID + "&appid=" + APPID;

        ApiCalls weatherApi = new ApiCalls(callStringJson);
        jsonAsString = await weatherApi.GetLocationJson();
        return jsonAsString;
    }

    //ShowLocationJson is called on button click
    protected void ShowLocationJson(object sender, EventArgs e)
    {           
        litOutput.Text = GetLocationJson().ToString();
    }

And my ApiCalls Class is:

public class ApiCalls
{

    HttpClient client = new HttpClient();
    Uri url;
    
    public ApiCalls(string link)
    {
        url = new Uri("https://" + link);            
    }

    public async Task<string> GetLocationJson()
    {
        string content = await client.GetStringAsync(url);
        return content;
    }
}

url variable is being passed the correct values so I know it's ok up to there.

Im using ASP.NET Framework 4.5 as well

Answer 1

As Steve and mason have already noticed you have to await all methods returning Task. You need to change your ShowLocationMethod to:

protected async void ShowLocationJson(object sender, EventArgs e)
{           
    litOutput.Text = await GetLocationJson();
}

You receive System.Threading.Tasks.Task1[System.String] because you call method ToString() of Task object. The default implementation of the ToString method returns the fully qualified name of the type of the object: Task<String>