Question

我不确定我是否会重载任何内容，但是当我将所需的所有条件添加到一个if语句时，它总是返回true。它似乎总是显示我的错误信息，但当我只添加一个条件时，它完全正常。另外，我知道我的代码很乱，我只是一个新手，对我很轻松。

Console.ForegroundColor = ConsoleColor.Green;
string[] Class = new string[] { "AA", "BB", "CC", "DD", "EE", "FF", "GG", "HH", "II", "JJ", "KK", "LL", "MM", "NN", "OO" };
double[] Rate = new double[] { .015, .023, .010, .042, .051, .004, .022, .030, .001, .010, .020, .030, .045, .033, .050 };
Console.Write("Please enter vehicle classification: ");
string Vclass = Console.ReadLine();
if (Vclass != "AA" || Vclass != "BB" || Vclass != "CC" || Vclass != "DD" || Vclass != "EE" || Vclass != "FF" || Vclass != "GG" || Vclass != "HH" || Vclass != "II" || Vclass != "JJ" || Vclass != "KK" || Vclass != "LL" || Vclass != "MM" || Vclass != "NN" || Vclass != "OO")
{
        Console.ForegroundColor = ConsoleColor.Red;
        Console.WriteLine("There is an error with the vehicle class.");
        Console.ForegroundColor = ConsoleColor.Green;
}

Answer 1

我有一碗水果。我想确保其中没有我不喜欢的水果。我喜欢的水果是：苹果，香蕉，葡萄和 kiwis 。

所以我不喜欢的那些不是苹果 AND 不是香蕉 AND 不是葡萄 AND 不是 kiwis 。

我不喜欢的那些不是那些不是苹果或香蕉 OR grape OR kiwis 。

||相当于懒惰的 OR 。您的情况应该是使用惰性 AND ：&&。

if (Vclass != "AA" && 
    Vclass != "BB" && 
    Vclass != "CC" && 
    Vclass != "DD" && /*..etc*/)

Answer 2

所以，基本上，你正在寻找这个：

Console.ForegroundColor = ConsoleColor.Green;
string[] Class = new string[] { "AA", "BB", "CC", "DD", "EE", "FF", "GG", "HH", "II", "JJ", "KK", "LL", "MM", "NN", "OO" };
double[] Rate = new double[] { .015, .023, .010, .042, .051, .004, .022, .030, .001, .010, .020, .030, .045, .033, .050 };
Console.Write("Please enter vehicle classification: ");
string Vclass = Console.ReadLine();
if (!Class.Contains(Vclass))
{
    Console.ForegroundColor = ConsoleColor.Red;
    Console.WriteLine("There is an error with the vehicle class.");
    Console.ForegroundColor = ConsoleColor.Green;
}

if语句似乎不适用于多个条件

2 个答案: