c# - 是否可以创建没有类型参数的泛型类？

Question

据我所知，这是不可能的，但我宁愿问并让自己出丑:P。

所以，我有通用类 Operation<T>哪里T是该操作的返回值。这个类还告诉我操作是否成功，如果不成功，则会显示消息(例如异常消息等)

public class Operation<T>
{

    public T Value { get; set; }
    public bool Succeeded { get; set; }
    public string[] Messages { get; set; }

    internal Operation(T value)
    {
        Value = value;
        Succeeded = true;
    }

    internal Operation(bool succeeded, string[] messages = null)
    {
        Succeeded = succeeded;
        Messages = messages;
    }


    public static Operation<T> Completed(T value)
    {
        return new Operation<T>(value);
    }

    public static Operation<T> Success()
    {
        return new Operation<T>(true);
    }

    public static Operation<T> Failure(string[] messages)
    {
        return new Operation<T>(false, messages);
    }
}

某些情况下，我只想说操作成功与否，不需要 T值。

伪代码示例:

    // Example operation where I need T value
    Operation<int> op = _SumTwoIntegersService.Sum(1, 2); 
    Console.WriteLine(operation.Value); // 3

    // Example operation where I only need the operation status
    Operation op = _UserService.Add(user); // Is this possible? Initiate Operation without the type argument
    if (op.Succeeded)
        return Ok();
    else
        return BadRequest(op.Messages);

Answer 1

In some cases, I only want to say that the operation was successful or not, and I don't need the T value.

在这种情况下，我基本上会遵循 Task 的模型和Task<T> :有一个非泛型基类，其中包含不依赖于 T 的所有内容，以及所有事物的通用派生类 T -具体:

public class Operation
{
    public bool Succeeded { get; set; }
    public string[] Messages { get; set; }

    // Constructors, other methods
}

public class Operation<T> : Operation
{
    public T Value { get; set; }

    // Constructors, other methods
}