使用此代码：
public partial class Form1 : Form
{
private static readonly int TABCONTROL_BASICINFO = 0;
private static readonly int TABCONTROL_CONFIDENTIALINFO = 1;
private static readonly int TABCONTROL_ROLESANDSECURITY = 2;
private static readonly int TABCONTROL_INACTIVEINFO = 3;
. . .
int ActiveTabPage = tabControlWorker.SelectedIndex;
switch (ActiveTabPage) {
case TABCONTROL_BASICINFO:
if (currentNode == "NodeBuckingham") {
} else if (currentNode == "NodeNamath") {
} else if (currentNode == "NodeParsons") {
} else {
}
break;
…我必须用“0”替换“TABCONTROL_BASICINFO”,或者我得到,“一个常数值是
预期”
天堂到Murgatroyd！看不到TABCONTROL_BASICINFO是0吗？
解决方法
如果要使编译器成为常量表达式,请将其声明为const：
// Note that static readonly is implied here private const int TABCONTROL_BASICINFO = 0;
或遵循.NET命名规则…
private const int TabControlBasicInfo = 0;
或者使用枚举,因为您基本上有一组固定值：
private enum TabControlType
{
// Could ditch the explicit values here if you want
BasicInfo = 0,ConfidentialInfo = 1,...
}
顺便说一句,你也可以在C#中打开字符串,所以这样：
if (currentNode == "NodeBuckingham") {
} else if (currentNode == "NodeNamath") {
} else if (currentNode == "NodeParsons") {
} else {
}
可以变成：
switch (currentNode) {
case "NodeBuckingham":
...
break;
case "NodeNamath":
...
break;
case "NodeParsons":
...
break;
default:
...
break;
}
