c#文件操作（创建、添加）  

 

需求是对地图服务创建角色，如果sec文件不存在先创建，再新增role；如果sec文件存在，则直接增加role角色。

创建文件：

                                           using (StreamWriter sw = File.CreateText(strSecPath))

                                            {

                                                sw.WriteLine("<Permissions>");

                                                sw.WriteLine("\t<Allowed>");

                                                sw.WriteLine("\t\t<Principal>" + arrRoles[j] + "</Principal>");

                                                sw.WriteLine("\t</Allowed>");

                                                sw.WriteLine("\t<Denied>\r\n\t</Denied>");

                                                sw.WriteLine("</Permissions>");

                                            }

添加记录：

                                      StreamReader srOld = new StreamReader(strSecPath, System.Text.Encoding.Default);

                                        int iLineOld = 0;

                                        while(srOld.ReadLine()!=null)

                                        {

                                            iLineOld++;

                                        }

                                        srOld.Close();

                                        string[] arrNew = new string[iLineOld+1];

                                        StreamReader srNew = new StreamReader(strSecPath, System.Text.Encoding.Default);

                                        string strLine = null;

                                        int iFlag = -1;

                                        while((strLine=srNew.ReadLine())!=null)

                                        {

                                            iFlag++;

                                            if(iFlag<2)

                                            {

                                                arrNew[iFlag] = strLine;

                                            }else

                                            {

                                                int iLS = iFlag + 1;

                                                arrNew[iLS] = strLine;

                                            }

                                        }

                                        arrNew[2] = "\t\t<Principal>" + arrRoles[j] + "</Principal>";

                                        srNew.Close();

                                        File.Delete(strSecPath);

                                        using(StreamWriter swNew = File.CreateText(strSecPath))

                                        {

                                            for (int m = 0; m < arrNew.Length; m++)

                                            {

                                                swNew.WriteLine(arrNew[m]);

                                            }                                       

                                        }