是否可以使用Task< bool>在有条件的情况下? [英] Is it possible to use Task<bool> in if conditions?

问题描述

在Windows Phone 8中，我有方法public async Task<bool> authentication().该函数的返回类型为bool，但是当我尝试在if条件错误中使用其返回值时，无法将Task<bool>转换为bool.

In Windows Phone 8 I have method public async Task<bool> authentication(). The return type of the function is bool but when I tried to use its returned value in a if condition error says can not convert Task<bool> to bool.

public async Task<bool> authentication()
{
    var pairs = new List<KeyValuePair<string, string>>
    {
        new KeyValuePair<string, string> ("user", _username),
        new KeyValuePair<string, string> ("password", _password)
    };

    var serverData = serverConnection.connect("login.php", pairs);

    RootObject json = JsonConvert.DeserializeObject<RootObject>(await serverData);

    if (json.logined != "false")
    {
        _firsname = json.data.firsname;
        _lastname = json.data.lastname;
        _id = json.data.id;
        _phone = json.data.phone;
        _ProfilePic = json.data.profilePic;
        _thumbnail = json.data.thumbnail;
        _email = json.data.email;
        return true;
    }
    else
        return false;
}

推荐答案

函数的返回类型是Task<bool>，而不是bool本身.要获得结果，您应该使用await关键字:

The return type of your function is Task<bool>, not bool itself. To get the result, you should use await keyword:

bool result = await authentication();

您可以阅读本 MSDN文章，以进一步了解async / await语言功能.

You can read "What Happens in an Async Method" section of this MSDN article to get more understanding on async / await language feature.

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