c#文件操作（创建、添加）

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]);
                                            }                                       
                                        }