c# - 混淆 C# 枚举和显式转换

Question

我有以下枚举 -->

    public enum SyncStatus
    {
        Unavailable = 0,
        Checking = 5,
        StartedAspNetDb = 10,
        FinishedAspNetDb = 20,
        StartedMatrixDb = 30,
        FinishedMatrixDb = 40,
        StartedConnectDb = 50,
        FinishedConnectDb = 60,
        StartedCmoDb = 70,
        FinishedCmoDb = 80,
        StartedMcpDb = 90,
        FinishedMcpDb = 100
    }

我在这里使用的 -->

        SyncInBackground.ReportProgress(SyncStatus.StartedAspNetDb);
        MergeRepl aspnetdbMergeRepl = new MergeRepl(SystemInformation.ComputerName + "\\SQLEXPRESS", "WWCSTAGE", "aspnetdb", "aspnetdb", "aspnetdb");
        aspnetdbMergeRepl.RunDataSync();
        SyncInBackground.ReportProgress(SyncStatus.FinishedAspNetDb);

        SyncInBackground.ReportProgress(SyncStatus.StartedMatrixDb);
        MergeRepl matrixMergeRepl = new MergeRepl(SystemInformation.ComputerName + "\\SQLEXPRESS", "WWCSTAGE", "MATRIX", "MATRIX", "MATRIX");
        matrixMergeRepl.RunDataSync();
        SyncInBackground.ReportProgress(SyncStatus.FinishedMatrixDb);

        SyncInBackground.ReportProgress(SyncStatus.StartedConnectDb);
        MergeRepl connectMergeRepl = new MergeRepl(SystemInformation.ComputerName + "\\SQLEXPRESS", "WWCSTAGE", "CONNECT", "Connect", "Connect");
        connectMergeRepl.RunDataSync();
        SyncInBackground.ReportProgress(SyncStatus.FinishedConnectDb); 

我不明白的是，如果 int 是默认的枚举控制类型，我是否必须像这样 CAST 这一行 -->

 SyncInBackground.ReportProgress((int)SyncStatus.Checking);

请原谅我的无知，我只是想了解事物的原因，而不仅仅是事物如此。

Answer 1

只是没有从枚举类型到其基础类型的隐式转换。这使得不小心使用枚举作为其数值变得更加困难。

(反过来也没有转换。)

顺便说一句，是从常量 0 到任何枚举类型的隐式转换。

哦，从装箱的枚举值拆箱到它的基础类型——反之亦然——也可以。至少在某一时刻，这在 CLI 规范和 C# 规范中都被严重破坏了；它现在可能已经修复了:)

编辑:

如果您实际上只是想将这些值用作数字，那么这里有一个替代选项:

public static class SyncStatus
{
    public const int Unavailable = 0;
    public const int Checking = 5;
    public const int StartedAspNetDb = 10;
    public const int FinishedAspNetDb = 20;
    public const int StartedMatrixDb = 30;
    public const int FinishedMatrixDb = 40;
    public const int StartedConnectDb = 50;
    public const int FinishedConnectDb = 60;
    public const int StartedCmoDb = 70;
    public const int FinishedCmoDb = 80;
    public const int StartedMcpDb = 90;
    public const int FinishedMcpDb = 100;
}

或者，写一个这样的方法:

static void ReportProgress(SyncStatus status)
{
    SyncInBackground.ReportProgress((int) status);
}