[英]"Object Reference is required for non-static field"
So I needed to make a random number generator for my minesweeper project, and I decided to put it in a method.所以我需要为我的扫雷项目制作一个随机数生成器,我决定把它放在一个方法中。
public static void GenerateBombs(int gsize, int numbombs, HashSet<int> numbers)
{
int num = gsize * gsize;
while (numbers.Count < numbombs)
{
numbers.Add(Random.Next(1, num));
}
}
However I keep getting the "Object Reference needed for non-static field, property, or method."但是,我不断收到“非静态字段、属性或方法所需的对象引用”。 I don't know why and I can't figure it out from the other questions.我不知道为什么,我无法从其他问题中弄清楚。
Do like this:这样做:
private static Random rand = new Random();
public static void GenerateBombs(int gsize, int numbombs, HashSet<int> numbers)
{
int num = gsize * gsize;
while (numbers.Count < numbombs)
{
numbers.Add(rand.Next(1, num));
}
}
The method Next()
of the class Random
is not a static method. class Random
的Next()
方法不是 static 方法。 You have to declare an instance of the class Random
first:您必须先声明一个 class Random
的实例:
static Random random = new Random();
then you can use it as numbers.Add(random.Next(1, num))
, now using the static instance of the class instead of the class itself.那么您可以将其用作numbers.Add(random.Next(1, num))
,现在使用 class 的 static 实例而不是 class 本身。
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