从MIF文件直接读取道路数据

string  file =   @" C:\Inetpub\wwwroot\SSWeb\node\Road.MIF " ; // 载入数据，使用绝对路径(单独制作的综合节点图层)
            StreamReader sr  =   new  StreamReader(file);
             string  nextLine, sTmp;
             long  nTmp, mTmp;
            nTmp  =  mTmp  =   0 ;
            TNode fNode, cNode;
            fNode  =  cNode  =   null ;
             while  ((nextLine  =  sr.ReadLine())  !=   null )
             {
                sTmp = nextLine.Trim();
                if (sTmp.Length > 14 && sTmp.Substring(0,14).CompareTo("Pline Multiple") == 0)
                {
                    nTmp = 0;
                    nTmp = Convert.ToInt32(sTmp.Substring(14));
                    for (long i=0; i < nTmp; i++)
                    {
                        if ((nextLine = sr.ReadLine()) == null)
                            break;

                        fNode = cNode = null;
                        mTmp = 0;
                        sTmp = nextLine.Trim();
                        mTmp = Convert.ToInt32(sTmp);
                        for (long n=0; n < mTmp; n++)
                        {
                            if ((nextLine = sr.ReadLine()) == null)
                                break;

                            sTmp = nextLine.Trim();
                            string delimStr = " ";
                            char [] delimiter = delimStr.ToCharArray();
                            string [] aTmp = sTmp.Split(delimiter,2);

                            fNode = cNode;
                            cNode = new TNode();
                            cNode.Sx = Convert.ToDouble(aTmp[0]);
                            cNode.Sy = Convert.ToDouble(aTmp[1]);
                            cNode.AddChild(fNode);
                            if (fNode != null)
                                fNode.AddChild(cNode);
                            
                            mDataList.Add(fNode);
                            mDataList.Add(cNode);
                        }
                    }
                }
                else if (sTmp.Length > 4 && sTmp.Substring(0,5).CompareTo("Pline") == 0)
                {
                    fNode = cNode = null;
                    nTmp = 0;
                    nTmp = Convert.ToInt32(sTmp.Substring(5));
                    for (long i=0; i < nTmp; i++)
                    {
                        if ((nextLine = sr.ReadLine()) == null)
                            break;

                        sTmp = nextLine.Trim();
                        string delimStr = " ";
                        char [] delimiter = delimStr.ToCharArray();
                        string [] aTmp = sTmp.Split(delimiter,2);

                        fNode = cNode;
                        cNode = new TNode();
                        cNode.Sx = Convert.ToDouble(aTmp[0]);
                        cNode.Sy = Convert.ToDouble(aTmp[1]);
                        cNode.AddChild(fNode);
                        if (fNode != null)
                            fNode.AddChild(cNode);

                        mDataList.Add(fNode);
                        mDataList.Add(cNode);
                    }
                }
            }
            sr.Close();