Question

d 想要写入一个 C 类, 以便它有一个静态字段, 该字段一次初始化, 并且对所有 C< & gt; 保持恒定。

有可能吗?

这里我所合作的例子如下:

void Main()
{
    Console.WriteLine (C<A>.Value);
    Console.WriteLine (C<B>.Value);
    Console.WriteLine (C<A>.Value2);
    Console.WriteLine (C<B>.Value2);
}

class C<T>
{
    static O O = new O();
    public static string Value { get { return "value of C<T> where T : " + typeof(T).Name; } }
    public static string Value2 { get { return O.ToString() ?? "value of C<T> where T : " + typeof(T).Name; } }
}

class O
{
    Guid guid;
    public O()
    {
        this.guid = Guid.NewGuid();
        Console.WriteLine ("O created {0}", this.guid);
    }
    public override string ToString()
    {
        return this.guid.ToString();
    }
}

class A
{
}

class B
{
}

<强>产出:

value of C<T> where T : A
value of C<T> where T : B
O created 05e6885b-2aa3-4d0d-aec1-fefbe5294f07
05e6885b-2aa3-4d0d-aec1-fefbe5294f07
O created 864554bf-6980-4a0f-9b63-4c0affa21222
864554bf-6980-4a0f-9b63-4c0affa21222

Answer 1

当然,从BaseC获得C, 并声明静态字段在那里,像这样:

class BaseC
{
    protected static O = new O();
}

class C<T>: BaseC ...

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