c# - 如何将泛型类型作为参数传递给 Enum.Parse()

Question

我有一个带有通用方法的类:

public record OperationCollectionGeneric<OPERATIONTYPE> where OPERATIONTYPE: notnull, Enum
{
    public OPERATIONTYPE Group { get; }

    public OperationCollectionGeneric(string part1, string? part2 = null, string? part3 = null)
    {
        Group = Enum.Parse<OPERATIONTYPE>(part1, true);
    }

Enum.Parse() 方法出现以下错误:

Error CS0453 The type 'OPERATIONTYPE' must be a non-nullable value type in order to use it as parameter 'TEnum' in the generic type or method 'Enum.Parse(ReadOnlySpan, bool)'

如何传递确保 OPERATIONTYPE 参数为 Enum 类型

我尝试使用 where 键设置 OPERATIONTYPE 的枚举类型，但它不起作用。

Answer 1

Enum.Parse仅限于struct，因此更改通用约束以匹配它:

public record OperationCollectionGeneric<OPERATIONTYPE> where OPERATIONTYPE : struct, Enum