c# - 如何将泛型类型参数传递给从构造函数调用的方法？

Question

这是构造函数:

 public PartyRoleRelationship(PartyRole firstRole, PartyRole secondRole)
        {
            if (firstRole == secondRole)
                throw new Exception("PartyRoleRelationship cannot relate a single role to itself.");

            if (firstRole.OccupiedBy == null || secondRole.OccupiedBy == null)
                throw new Exception("One or both of the PartyRole parameters is not occupied by a party.");

            // Connect this relationship with the two roles.
            _FirstRole = firstRole;
            _SecondRole = secondRole;


            T = _FirstRole.GetType().MakeGenericType();

            _SecondRole.ProvisionRelationship<T>(_FirstRole); // Connect second role to this relationship.
        }

在最后一行，它在 _SecondRole 上调用 ProvisionRelationship，它给我运行时错误:找不到类型或命名空间“T”...

我如何 (a) 正确分配 T，或 (b) 使用构造函数传递通用类型？我一直在浏览很多帖子，但由于缺乏理解，可能遗漏了一些东西。任何人对此的帮助将不胜感激。

Answer 1

您的类(class)需要通用。所以 PartyRoleRelationship 需要看起来像这样:

public class PartyRoleRelationship<T>
{
    public PartyRoleRelationship(T arg, ...)
    {
    }
}

在此处阅读有关泛型类的更多信息:

http://msdn.microsoft.com/en-us/library/sz6zd40f(v=vs.80).aspx

http://msdn.microsoft.com/en-us/library/ms379564(v=vs.80).aspx

编辑:

你可能会简化你的代码并像这样做:

public class RoleRelationship<T>
{
    public RoleRelationship(T firstRole, T secondRole)
    {
        if (firstRole.OccupiedBy == null || secondRole.OccupiedBy == null)
            throw new Exception("One or both of the Role parameters is not occupied by a party.");

        // Connect this relationship with the two roles.
        _FirstRole = firstRole;
        _SecondRole = secondRole;

        _SecondRole.ProvisionRelationship<T>(_FirstRole);
    }
}