Question

我有一个包含这三项的数组：

string[] departmentArray = {
    "Warranty Service Representative",
    "Warranty Service Administrative Manager",
    "Warranty and Site Administrator"
};

我有这个字符串

var department = "Warranty Service Representative"

我有这个条件，假设测试字符串部门是否不在departmentArray

if (Array.Exists(departmentArray, element => element != department)){
}

显然字符串在数组中，所以它应该返回false，但是对于我的字符串，这返回true。我做错了什么？

Answer 1

这不会更简单吗？

string[] departmentArray = { 
    "Warranty Service Representative", 
    "Warranty Service Administrative Manager", 
    "Warranty and Site Administrator" };

String department = "Warranty Service Representative";

if (departmentArray.Contains(department) == false)
{
}

Answer 2

if (!Array.Exists(departmentArray, element => element == department))
{
}

在这种情况下，基础逻辑看起来像：

!(departmentArray[0] == department || departmentArray[1] == department || ..)

在您的代码中，您有：

departmentArray[0] != department || departmentArray[1] != department || ..

Answer 3

代码：

if (Array.Exists(departmentArray, element => element != department))
{
}

如果true departmentArray !=中存在任何元素，则

为department，这就是为什么在这种情况下结果是true而不是{{1} （显然false中的字符串与departmentArray不同）。因此，如果您想检查department中department是否不在departmentArray，请尝试以下操作：

bool IsNotInArray(String[] array, string element){
    return !Array.Exists(array, e => e == element);
}

C＃如果item不在数组中

3 个答案: