局部变量“mydate"在访问之前可能未初始化 [英] Local variable 'mydate' might not be initialized before accessing

问题描述

在我的代码中，我像这样初始化了日期时间

In my code i initilized Datetime like this

 DateTime myDate;

但是当我尝试访问它时，我收到了这个错误.

But when i try to access it then i got this error.

局部变量myDate"在访问之前可能没有被初始化

Local variable 'myDate' might not be initialized before accessing

这里我初始化了我的日期知道吗?

Here i initialized my date know ?

推荐答案

你声明它，但你没有给它一个值；你不能读取一个局部变量，直到它被明确分配".举个简单的例子:

You declared it, but you didn't give it a value; you can't read a local variable until it is "definitely assigned". For a simple example:

DateTime myDate = DateTime.UtcNow; // is assigned

您不必立即赋予它一个值...您可以在尝试阅读它之前的任何时间赋予它一个值，包括任何分支等，只要它有一个值就不会产生歧义，例如:

You don't have to give it a value right away... you can give it a value any time before you try to read it, including any branching etc that leaves no ambiguity that it has a value, for example:

DateTime myDate;
//....
if(condition) {
    myDate = DateTime.UtcNow;
} else {
    myDate = GetDateFromSomewhereElse();
}
Console.WriteLine(myDate);

相比之下，字段(类变量)会自动初始化为它们的全零值，并且从对象的创建开始就被视为明确赋值".

For contrast, fields (class variables) are automatically initialized to their all-zero value, and are treated as "definitely assigned" from the object's creation.

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