在if语句中声明var c# [英] declaring var inside if statement c#

问题描述

我有这个 var，但我想根据语句更改它的内容，我无法让它工作，因为当我使用它时，VS 说它尚未声明，即使该声明为真...

I have this var, but I want to change it's content depending on the statement, I can't get it working because when I use it, VS says it has not been declared, even if the statement is true...

if (DateTime.Today.Day > 28 && DateTime.Today.Day < 2)
{
    var days = GetDaysLikeMe(DateTime.Today).Take(50).Where(d => d.Date.Day > 28 && d.Date.Day < 2).Take(4);
}
else
{
    var days = GetDaysLikeMe(DateTime.Today).Take(50).Where(d => d.Date.Day < 28 && d.Date.Day > 2).Take(4);
}

我试图在框外声明变量......但也不能让它工作，我在 var 日保持的函数是这个

I've tried to declare the variable outside the box... But can't get it working neither, the function I keep on var days is this

    public IEnumerable<DateTime> GetDaysLikeMe(DateTime currentDate)
    {
        DateTime temp = currentDate;
        while (true)
        {
            temp = temp.AddDays(-7);
            yield return temp;
        }
    }

推荐答案

声明 if 语句范围之外的变量:

Declare the variable outside the scope of the if statement:

IEnumerable<DateTime> days;

if (DateTime.Today.Day > 28 && DateTime.Today.Day < 2)
{
    days = GetDaysLikeMe(calendario.Value.Date).Take(50).Where(d => d.Date.Day > 28 && d.Date.Day < 2).Take(4);
}
else
{
    days = GetDaysLikeMe(calendario.Value.Date).Take(50).Where(d => d.Date.Day < 28 && d.Date.Day > 2).Take(4);
}

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