接受多种类型的函数枚举

Question

I currently have two enums :

public enum LigneComponent
{
    LIEN = 0,
    SUPPORT = 1,
    OUVRAGE = 2,
}



public enum PosteComponent
{
    BT = 0,
    COMPTEUR = 1,
    AMM = 2,
    TFM = 3,
    HTA = 4,
    DLD = 5,
    GENERALITES = 6
}

and I'm using one of the enum in another class :

public class ExcelReader
{
    internal Dictionary<InfosPosteViewModel.PosteComponent, StorageFile> ExcelDataFiles { get; set; }

    internal async Task SetupExcelFiles(Dictionary<InfosPosteViewModel.PosteComponent, string> fileKeyNames, StorageFolder filesDirectory)
    {
        //code sample here
    }
}

but now I want to make that Dictionary and that function more generic to make it accept the two different types of enum but I still don't want it to accept more than these two types, is there a way to do that easily ?

Answer 1

C# 7.3 includes an Enum contraint that you can use to enforce the type to be any enumeration type:

public class ExcelReader<T> where T : Enum
{
    internal Dictionary<T, StorageFile> ExcelDataFiles { get; set; }

    internal async Task SetupExcelFiles(Dictionary<T, string> fileKeyNames, StorageFolder filesDirectory)
    {
        //code sample here
    }
}

There is no support in the language for specifying specific types of enums though, at least not at compile time. You can always check the type at runtime:

internal async Task SetupExcelFiles(Dictionary<T, string> fileKeyNames, StorageFolder filesDirectory)
{
    if (typeof(T) != typeof(LigneComponent) && typeof(T) != typeof(PosteComponent))
        throw new InvalidOperationException("Invalid type argument");

    //code sample here
}