问题描述
解决如何完成这项工作的问题:
public class Visitor<T>
{
public VisitorMember<T,TMember> Next<TMember>(Expression<Func<T,TMember>> member)
{
return new VisitorMember<T,TMember>(member);
}
}
public class VisitorMember<T,TMember>
{
private Visitor<T> _root;
private Expression<Func<T,TMember>> _member;
public VisitorMember(Visitor<T> root,Expression<Func<T,TMember>> member)
{
_root = root;
_member = member;
}
public VisitorMember<T,TNextMember> Next<TNextMember>(Expression<Func<TMember,TNextMember>> nextMember)
{
return new VisitorMember<T,TNextMember>(_root,obj =>
{
/*
* If remove expressions and stay Func<> then works:
* var member = _member.Invoke(obj);
* return _nextMember.Invoke(member);
*
* But how to do this with expressions?
*/
})
}
}
如何通过调用 second 和 first 的结果将两个表达式合并为一个?输出类型需要是 Expression
解决方法
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