How to convert int to enum value?

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Cast int to enum in C# 21 answers

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根据你的枚举声明，Suit在[0..3]范围内，而等级在[1..13]范围内（注意，该等级不是以0为基础的），所以应该纠正内循环：

  for (int rankVal = 0; rankVal < 13; rankVal++) // <- 14 changed for 13: [0..13] has the same length as [1..14] 
  { 
    cards[suitVal * 13 + rankVal] = new Card((Suits)suitVal, (Rank)(rankVal + 1)); // <- removed -1 from index; add 1 to rankVal, we need [1..14], not [0..13]
    ...

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change your line in for like this

 cards[suitVal * 13 + rankVal] = new Card(((Suit)suitVal), ((ranks)rankVal));

and as your class is taking enums in constructor so change it like this

public readonly Suit suit;
public readonly ranks rank;
public Card(Suit newSuit, ranks newRank)
{
    suit = newSuit;
    rank = newRank;
}

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I will see it will get other error "Index was outside the bounds of the array"

When suitVal = 0 and rankVal = 0, cards[suitVal * 13 + rankVal - 1] =-1 which is outside array index.

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