c# - 无法识别的数组错误

Question

以下是创建一些错误，即“B”无法识别（以及其他 20 个字母和“文件”无法识别。

我看不到这里的问题？

string[] correctAnswers = {B,D,A,A,C,A,B,A,C,D,B,C,D,A,D,C,C,B,D,A}; 
string[] studentResults = File.ReadAllLines("studentResults.txt");

谢谢

Answer 1

您应该将它们用双引号括起来：

string[] correctAnswers = {"B","D","A","A","C","A","B","A","C","D","B","C","D","A","D","C","C","B","D","A"}; 

编辑 ：

（感谢@goldenparrot）你需要添加这个命名空间：

using System.IO;

能够使用 File.ReadAllLines()。要么：

string[] studentResults = System.IO.File.ReadAllLines("studentResults.txt");

Answer 2

const string A = "A";
const string B = "B";
const string C = "C";
const string D = "D";

string[] correctAnswers = { B, D, A, A, C, A, B, A, C, D, B, C, D, A, D, C, C, B, D, A }; 

Answer 3

正如其他人所说，您必须用双引号将字符串文字括起来。

现在，如果你想维护一个字符数组，最好使用一个简单的字符串而不是字符串数组，因为字符串也是可迭代的：

string correctAnswers = "BDAACABACDBCDADCCBDA";

然后是这样的：

foreach (char answer in correctAnswers) {
    // ...
}

关于您问题的第二部分，File类位于System.IO命名空间中，因此您需要一个using System.IO;指令，或者必须通过其完全限定名称来引用该类，System.IO.File.

Answer 4

将字母写在双引号内，并@用于文件的路径。

string[] correctAnswers = {"B","D","A","A","C","A","B","A","C","D","B","C","D","A","D","C","C","B","D","A"};
 string[] studentResults = File.ReadAllLines(@"studentResults.txt");

Answer 5

你有一个数组string。如您所知（或不知道），字符串用双引号 - “”。因此，在您的问题中， string[] 应该如下所示：

string[] correctAnswers = {"B","D","A","A","C","A","B","A","C","D","B","C","D","A","D","C","C","B","D","A"};