C#枚举-针对掩码检查标志

你可以扭转局面,检查复合材料 enum 具有标志,而不是检查组合的标志,如下所示:

if (MemoryProtection.Readable.HasFlag(myMemoryProtection)) {
    ...
}

以下是一个示例:

MemoryProtection a = MemoryProtection.ExecuteRead;
if (MemoryProtection.Readable.HasFlag(a)) {
    Console.WriteLine("Readable");
}
if (MemoryProtection.Writable.HasFlag(a)) {
    Console.WriteLine("Writable");
}

这个打印 Readable .

尝试按位运算符:

[TestMethod]
public void FlagsTest()
{
    MemoryProtection mp = MemoryProtection.ReadOnly | MemoryProtection.ReadWrite | MemoryProtection.ExecuteRead | MemoryProtection.ExecuteReadWrite;
    MemoryProtection value = MemoryProtection.Readable | MemoryProtection.Writable;
    Assert.IsTrue((value & mp) == mp);
}

对 hasFlag 检查是否设置了每个位字段(标志)。

而不是治疗 Readable 作为所有保护措施的组合,包括 Read 在名字里,你能把作文改过来吗?例如。

[Flags]
private enum MemoryProtection: uint
{
    NoAccess         = 0x000,
    Read             = 0x001,
    Write            = 0x002,
    Execute          = 0x004,
    Copy             = 0x008,
    Guard            = 0x010,
    NoCache          = 0x020,
    ReadOnly         = Read,
    ReadWrite        = (Read | Write),
    WriteCopy        = (Write | Copy),
    // etc.
    NoAccess         = 0x800
}

然后您可以编写如下代码:

myMemoryProtection.HasFlag(MemoryProtection.Read)