Question

我有第三方结构，包含以下内容：

[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），以便我的课程可以像：

string failureReason = GetReasonDescription(reasoncode);

提到的一些事情是一些有int值，一些有字符串值。我只担心具有int值的那些。我也只想要那些以GHI_开头的，如果可能的话，但没什么大不了的。

Answer 1

你可以通过分析结构来解决它：

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
}

用法示例：

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

Answer 2

看起来你的整数consts应该是enumeration（或几个枚举） - 这也允许转换为整数和从整数转换。

你可以通过反射来做到这一点，但它比转换为枚举要慢。

Answer 3

如果将整数值填充到枚举而不是常量中，则可以执行

public enum BigBlueReasonCode
{
    ABC_REASONCODE_DESCRIPTION01 = 1000,
    ABC_REASONCODE_DESCRIPTION01 = 1005,
    ABC_REASONCODE_DESCRIPTION01 = 1010,
    DEF_REASONCODE_DESCRIPTION01 = 2001,
    DEF_REASONCODE_DESCRIPTION01 = 2010,
    DEF_REASONCODE_DESCRIPTION01 = 2013,
    GHI_REASONCODE_DESCRIPTION01 = 3050,
    GHI_REASONCODE_DESCRIPTION01 = 3051,
    GHI_REASONCODE_DESCRIPTION01 = 3052
}

var failureCode = Enum.GetName( reasoncode )

（当然，因为这段代码不能正常工作，因为你在名称中有重复项，但它也不会编译为常量。）

根据值查找常量

3 个答案: