重构方法 - 传入属性名称 [英] Refactor methods - pass in property name

问题描述

我不知道是否有可能将这两种方法重构为一体。唯一不同的是在选择的方法; 。人使用BaselineSetNumber，其他ComparisonSetNumber

I'm wondering if it's possible to refactor these two methods into one. The only difference is in the Select method; one uses BaselineSetNumber, the other ComparisonSetNumber.

public Set LoadBaselineSet(ObservableCollection<Set> sets)
{
    using (var db = _contextFactory.GetContext())
    {
        var setNumber =
            db.Users.Where(x => x.Login == Environment.UserName)
                    .Select(x => x.BaselineSetNumber).Single(); // !!! HERE
        return sets.Single(x => x.SetNumber == setNumber);
    }
}

public Set LoadComparisonSet(ObservableCollection<Set> sets)
{
    using (var db = _contextFactory.GetContext())
    {
        var setNumber =
            db.Users.Where(x => x.Login == Environment.UserName)
                    .Select(x => x.ComparisonSetNumber).Single(); // !!! HERE
        return sets.Single(x => x.SetNumber == setNumber);
    }
}

我想有一种方法，我可以调用像 LoadSet（套，BaselineSetNumber）; 或 LoadSet（套，ComparisonSetNumber）;

推荐答案

是的，这是可能通过创建的高阶函数。您的新代码将是这个样子：

Yes, this is possible by creating a higher-order function. Your new code would look something like this:

public Set LoadBaselineSet(ObservableCollection<Set> sets)
{
    return LoadSet(sets, (x) => x.BaselineSetNumber)
}

public Set LoadComparisonSet(ObservableCollection<Set> sets)
{
    return LoadSet(sets, (x) => x.ComparisonSetNumber)
}

public Set LoadSet(ObservableCollection<Set> sets, Func<dbObject, Int> elementIdentity){
        using (var db = _contextFactory.GetContext())
    {
        var setNumber =
            db.Users.Where(x => x.Login == Environment.UserName)
                    .Select(elementIdentity).Single(); // !!! HERE
        return sets.Single(x => x.SetNumber == setNumber);
    }
}

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