【在线等】这段简单的C#程序哪里错了？

[gg882]

用头插法插入结点，最后输出，没有显示错误，但是结果输出的不正确，高手帮看看！

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;

namespace 支援
{
class TeacherList
{
public TeacherNode HeadNode;//头节点
public TeacherList(string Path)//从文件构造
{
HeadNode = new TeacherNode();
StreamReader sr = new StreamReader(Path,System.Text.Encoding.Default);
string line;
while ((line = sr.ReadLine()) != null)
{
Console.WriteLine(line);
TeacherNode node = new TeacherNode(line);
InsFirst(node);
}
sr.Close();
}

public void InsFirst(TeacherNode node)
{
node.NextNode = HeadNode.NextNode;
HeadNode.NextNode = node;
}
public void Display()
{
TeacherNode node = HeadNode.NextNode;
while (node != null)
{
node.Display();
node = node.NextNode;
}
}

}

}

[l527391549]

把Linq发出来看下

[yangqidong]

TeacherNode也贴出来看看

[gg882]

好啊！你的QQ是多少？

[gg882]

这个是TeacherNode
TeacherNode是正确的


using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace 支援
{
class TeacherNode
{
public TeacherRecord Record;
public TeacherNode NextNode;
public TeacherNode()
{
Record = null;
NextNode = null;
}
public TeacherNode(string line)
{
Record = new TeacherRecord(line);
NextNode = null;
}
public void Display()
{
if (Record != null)
{
Record.Display();
}
}
}
}

[heruoyong]

有可能是null的问题,Node.next为空,然后再使用该对象就出问题了
最好贴出来TeacherNode看看

[gg882]

TeacherNode 我已经贴出来了 呵呵

[gg882]

TeacherNode 我已经贴出来了 呵呵

[yangqidong]

没看出什么错，能说明一下运行结果是什么样的错误吗

[li45214521]

public void InsFirst(TeacherNode node) 
{ 
  node.NextNode = HeadNode.NextNode; 
  HeadNode.NextNode = node; 
} 

不对吧，

public void InsFirst(TeacherNode node) 
{ 
  node.NextNode = HeadNode; 
  HeadNode = node; 
}

[li45214521]

public class SimpleList<T>
    {
        private Node Header;

        public void InsertHeader(T t)
        {
            Node insert = new Node();
            insert.Data = t;
            if (Header == null)
            {
                insert = Header;
            }
            else
            {
                insert.Next = Header;
                Header = insert;
            }
        }

        private class Node
        {
            public Node Next = null;
            public T Data;
        }
    }

[十八道胡同]

太晚了，不想写了，lz好好检查下各个指针吧，

[heruoyong]

public void InsFirst(TeacherNode node)
{
node.NextNode = HeadNode.NextNode;
HeadNode.NextNode = node;
}

node这里的node如果是null就会出错
TeacherNode node = new TeacherNode(line);
InsFirst(node); 这里没有判断node是不是为空