public static C[] link_insert<P, C>(ref P parent, ref int count, string css)
        where P : Control
        where C : Control, new()
    {
        C[] childs = new C[count];
        for (int j = 0; j < count; j++)
        {
            childs[j] = new C();
            childs[j].CssClass = css + j.ToString();
            parent.Controls.Add(childs[j]);
        }
        return childs;
    }

这段代码，错在哪里？


如果把C的约束换成其他具体控件 就可以调用cssclass属性

public static C[] link_insert<P, C>(ref P parent, ref int count, string css)
        where P : Control
        where C : Button, new()
    {
        C[] childs = new C[count];
        for (int j = 0; j < count; j++)
        {
            childs[j] = new C();
            childs[j].CssClass = css + j.ToString();
            parent.Controls.Add(childs[j]);
        }
        return childs;
    }
比如这样写 就可以调用cssclass属性，不过这样写就限制了我传入的泛型c的类型