Question

有人可以解释为什么下面的“ board”初始化不起作用吗？这是我的代码：

public partial class frmSudoku : Form
{
   Label[,] board;    

   public frmSudoku()
   {
      InitializeComponent();
      board = {{lblS00, lblS01, lblS02, lblS03, lblS04, lblS05, lblS06, lblS07, lblS08},
                 {lblS10, lblS11, lblS12, lblS13, lblS14, lblS15,lblS16,lblS17, lblS18},
                 {lblS20, lblS21, lblS22, lblS22, lblS24, lblS25, lblS26, lblS27, lblS28},
                 {lblS30, lblS31, lblS32, lblS33, lblS34, lblS35, lblS36, lblS37, lblS38},
                 {lblS40, lblS41, lblS42, lblS43, lblS44, lblS45, lblS46, lblS47, lblS48},
                 {lblS50, lblS51, lblS52, lblS53, lblS54, lblS55, lblS56, lblS57, lblS58},
                 {lblS60, lblS61, lblS62, lblS63, lblS64, lblS65, lblS66, lblS67, lblS68},
                 {lblS70, lblS71, lblS72, lblS73, lblS74, lblS75, lblS76, lblS77, lblS78},
                 {lblS80, lblS81, lblS82, lblS83, lblS84, lblS85, lblS86, lblS87, lblS88}};
 }

我在VS2019上，每个逗号下都有那些红色下划线-它们的错误消息只是“;预期”（这显然是不对的；我试图用分号代替它只是为了查看，并且红色下划线刚刚转移了在带有错误消息“仅分配，调用，减量...可以用作语句”的标签下）。我真的不知道为什么这是非法的-我尝试在公共局部类下声明2D int数组，并在frmSudoku（）中类似地对其进行初始化，并且效果很好。什么使标签数组与众不同？

编辑：2D int数组不能正常工作，红色下划线显示（哎呀）只用了一段时间。

Answer 1

这不是2D阵列所独有的。使用ECMA C# Standard中的术语，数组初始化器仅在 array-creation-expression ，字段声明或局部变量声明中有效。

例如，这是有效的：

// array-initializer as part of a local variable declaration
string[] strings = { "x", "y" };

但这不是：

string[] strings;
// This is just an assignment expression, not part of a variable declaration
strings = { "x", "y" };

您可以使用* array-creation-expression（尽管：

string[] strings;
strings = new string[] { "x", "y" };

等效项适用于您的二维示例：

board = new Label[,] {{ ... }};

为什么此2D数组初始化非法？

1 个答案: