c# - 根据值查找常量

Question

我有一个由以下内容组成的第 3 方结构:

[StructLayout(LayoutKind.Sequential, Size=1)]
public struct BigBlueReasonCodes
{
    public const int ABC_REASONCODE_DESCRIPTION001 = 1000;
    public const int ABC_REASONCODE_DESCRIPTION002 = 1005;
    public const int ABC_REASONCODE_DESCRIPTION003 = 1010;
    public const int DEF_REASONCODE_DESCRIPTION004 = 2001;
    public const int DEF_REASONCODE_DESCRIPTION005 = 2010;
    public const int DEF_REASONCODE_DESCRIPTION006 = 2013;
    public const int GHI_REASONCODE_DESCRIPTION007 = 3050;
    public const int GHI_REASONCODE_DESCRIPTION008 = 3050;
    public const int GHI_REASONCODE_DESCRIPTION009 = 3052;
    public const string JKL_REASONCODE_DESCRIPTION010 = "XYZ";
    public const string GHI_REASONCODE_DESCRIPTION011 = "ST";


  static BigblueReasonCodes();
}

我正在尝试根据原因代码(值)查找原因描述(字段名称)，以便我的类可以执行以下操作:

string failureReason = GetReasonDescription(reasoncode);

值得一提的是，有些具有 int 值，有些具有字符串值。
我只担心具有 int 值的那些。
如果可能，我也只想要以 GHI_ 开头的那些，但没什么大不了的。

Answer 1

您可以通过分析结构使用反射来解决它:

public string GetReasonDescription(int reasonCode)
{
    return
        typeof(BigBlueReasonCodes)
            .GetFields(BindingFlags.Public | BindingFlags.Static)
            .Where(field => field.FieldType == typeof(int)) // Filter int values
            .Where(field => field.Name.StartsWith("GHI"))
            .Where(field => (int) field.GetValue(null) == reasonCode)
            .Select(field => field.Name).First(); // Assuming a field must exists
}

使用示例:

[Test]
public void GetReasonDescriptionTest()
{
    string reasonDescription = GetReasonDescription(3050);
    Assert.That(reasonDescription, Is.EqualTo("GHI_REASONCODE_DESCRIPTION007"));
}