Question

我有一个尖锐的代码，用于每个循环打印list.Code中的项目

    static bool Process_component_statement(List<Evl_component> components,
         Evl_statement s)
    {
        Debug.Assert(!(s.type == Evl_statement.Statement_type.ENDMODULE));
        State_Type state = State_Type.INIT;
        Evl_component comp = new Evl_component();
        Evl_pin pin = new Evl_pin();
        while(s.tokens.Count != 0 && (state != State_Type.DONE))
        {

            Evl_token t = s.tokens.First();
            s.tokens.Remove(s.tokens.First());
            //  branches here to compute state transitions
            if (state == State_Type.INIT)
            {
                if (t.type == Evl_token.Token_type.NAME)
                {
                    comp.type = t.str;
                    comp.name = "NONE";
                    state = State_Type.TYPE;
                }
            }
            else if (state == State_Type.TYPE)
            {
                if (t.type == Evl_token.Token_type.NAME)
                {
                    comp.name = t.str;
                    state = State_Type.NAME;
                }
                else if (t.str == "(")
                {
                    state = State_Type.PINS;
                }
            }
            else if (state == State_Type.NAME)
            {
                if (t.str == "(")
                {
                    state = State_Type.PINS;
                }
            }
            else if (state == State_Type.PINS)
            {
                if (t.type == Evl_token.Token_type.NAME)
                {
                    pin.name = t.str; pin.bus_msb = -1; pin.bus_lsb = -1;
                    state = State_Type.PIN_NAME;

                }
            }
            else if (state == State_Type.PIN_NAME)
            {
                if (t.str == ",")
                {
                    comp.pins.Add(pin);
                    state = State_Type.PINS;
                }
                else if (t.str == ")")
                {
                    comp.pins.Add(pin);
                    state = State_Type.PINS_DONE;
                }
            }
            else if (state == State_Type.PINS_DONE)
            {
                if (t.str == ";")
                {
                    state = State_Type.DONE;
                }
            }
            else if (state == State_Type.DONE)
            {
                return true;
            }
            else
            {
                Debug.Assert(false); // shouldn't reach here;
            }
        }
        components.Add(comp);
        if (s.tokens.Count != 0 || (state != State_Type.DONE))
        {
            Console.Error.WriteLine("something wrong with the statement");
            return false;
        }
        return true;
    }

并且在main中如果我使用输入，输出我看到的只是最后一个元素的重复，似乎只有最后一个元素在列表中添加并且它在输出中重复。

component not NONE 3
pin in2 -1 -1
pin in2 -1 -1
pin in2 -1 -1

如何获得类似

的输出

component  not NONE 3
pin out -1 -1
pin in1 -1 -1
pin in2 -1 -1

Answer 1

更改看起来像的所有代码：

comp.pins.Add(pin);

为：

comp.pins.Add(pin);
pin = new Evl_pin();

您的代码（按原样）的问题是您重复添加相同的引脚。所以问题不在于output i see is repetition of only last element - 它是你的第一，第二，第三元素等都是相同的元素。上述变化应该解决这个问题。

foreach在c sharp中重复返回最后一项

1 个答案: