我想定义一个类，ClassA，它可以作为参数传递给项目中的任何方法或类（全局范围）。然而，我想强制执行一个约束，以确保ClassA只能在单个ClassB的范围内实例化。换句话说，我希望该类具有相对于＜code＞ClassA＜/code＞的私有作用域，同时仍然能够将该对象作为参数传递给分布在整个项目中的方法和类。
这可能吗？
您可以使＜code＞ClassA＜/code＞抽象，并使具体实现为＜code＞ClassB＜/code＜私有（作为嵌套类）。
您可以使用内部构造函数使ClassA成为公共抽象类。
然后，ClassB可以定义从中派生的类，并创建“真实”实例。这将阻止程序集之外的任何人生成ClassA类型。
如果我能正确地理解你想在这里做什么。。。。。
使ClassB成为ClassA的嵌套类，并使ClassA的构造函数私有。
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