使用枚举标志满足条件后无法执行正确的操作

Cannot perform correct action after condition is met using Enumeration Flags

方法:

代码

 bool success = false;
 foreach (Employee emp in employees)
 {
 while (emp.Busy != true || success == true)
 {
 if (emp.Busy == false && emp.Skills.ToString() == _skillRequired.ToString() && success == false)
 {
 emp.EmployeeWorkload = _jobName;
 emp.ShiftsLeft = _shiftsLeft;
 emp.Busy = true;
 success = true;
 }
 else if (emp.Busy == true)
 { 
 MessageBox.Show("Sorry there is no one available for this job");
 }

问题

[Flags]
public enum MemberSkills { None = 0, CSharp = 1 << 0, SQL = 1 << 1, PHP = 1 << 2, Javascript = 1 << 3, Web = 1 << 4, Python = 1 << 5, Oracle = 1 << 6, CPlus = 1 << 7, Perl = 1 << 8 };

Employee e1 = new Employee(MemberJob.Employee, "Name", MemberSkills.CPlus | MemberSkills.CSharp, false);
Employee e2 = new Employee(MemberJob.Employee, "Another Name", MemberSkills.CSharp, false);

因为对象包含一个或多个MemberSkills,if语句读取对象为"CSharp | CPlus",无法正确执行方法。而是选择技能集中具有 CSharp 的员工。参见 e2

由于enum是Flags,所以可以使用enum的.HasFlag方法来检查是否设置了flags。

还是老办法;您可以使用 (emp.Skills & _skillRequired) == _skillRequired 查看是否设置了所有必需的标志。

Enum class 上有一个名为 HasFlag 的方法可以满足您的需要:

var _skillRequired = MemberSkills.CSharp;

if (emp.Skills.HasFlag(_skillRequired))
{
    ...
}

如果由于某种原因您无法更改 skillRequired,您需要将值解析为枚举:

var _skillRequiredAsEnum = (MemberSkills)Enum.Parse(typeof(MemberSkills), _skillRequired));