c#文件读取

最后的方法

internal void modify_byte_jcw(string name, string path, string path2)
        {
            byte[] byData = null;
            char[] charData = null;
            FileStream aFile = null;
            try
            {
                aFile = new FileStream(path + @"/" + path2, FileMode.Open);
                byData = new byte[aFile.Length];
                charData = new Char[aFile.Length];
                aFile.Seek(0, SeekOrigin.Begin);
                aFile.Read(byData, 0, (int)aFile.Length);
            }
            catch (IOException e)
            {
                MessageBox.Show(e.ToString());
                return;
            }
            Decoder d = Encoding.UTF8.GetDecoder();
            d.GetChars(byData, 0, byData.Length, charData, 0);

            StringBuilder sb = new StringBuilder(256);
            sb.Append("\r\r\n\t");
            sb.Append("<project>");
            sb.Append("\r\r\n\t");
            sb.Append("<path>" + name + @"\" + name + ".jcp</path>");
            sb.Append("\r\r\n\t");
            sb.Append("</project>");
            sb.Append("\r\r\n\t");
            sb.Append("</projects>");
            sb.Append("\r\r\n\t");
            
            char[] charData2 = new char[sb.Length];
            charData2 = sb.ToString().ToCharArray();;
            byte[] byData2 = new byte[charData2.Length];
            string a = "";

            FileStream wFile = null;
            try
            {
                wFile = new FileStream(path + @"/temp.jcw", FileMode.Create);
                wFile.Seek(0, SeekOrigin.Begin);

                int num = 0;
                for (int i = 0; i < charData.Length; i++)
                {
                    a = a + charData[i];

                    if (a.Contains("</projects>"))
                    {
                        wFile.Write(byData, 0, i - 12);
                        Encoder e = Encoding.UTF8.GetEncoder();
                        e.GetBytes(charData2, 0, charData2.Length, byData2, 0, true);
                        wFile.Write(byData2, 0, byData2.Length);
                        a = "";
                        num = i;
                        break;
                    }

                }
                wFile.Write(byData, num + 3, byData.Length - num - 3);

            }
            catch (Exception e)
            {
                MessageBox.Show(e.ToString());
                return;
            }
            finally
            {
                aFile.Close();
                wFile.Close();
            }

          
            
        }

 

Filestream读写文件总结

http://www.cnblogs.com/Fskjb/archive/2010/03/12/1684753.html

别人的c#读写文件的总结

http://www.cnblogs.com/qiantuwuliang/archive/2009/03/12/1409417.html

stream写文件的方式

internal void creatfile_xml_jcu(string name, string path, string path2)
        {
            //MessageBox.Show();
            try
            {
                StreamWriter sw = File.AppendText(path + "/" + path2 + ".jcu");//这是你要建立的XML路径，可以不存在
                sw.Write("<?xml version=\"1.0\" encoding=\"utf-8\" ?>");
                sw.Write("\r\r\n\r\r\n");
                sw.Write("<workspace_user>");
                sw.Write("\r\r\n\t");
                sw.Write("<active_project>");
                sw.Write("\r\r\n\t\t");
                sw.Write("<label>" + path2 + "</label>");
                sw.Write("\r\r\n\t");
                sw.Write("</active_project>");
                sw.Write("\r\r\n\t");
                sw.Write("<projects>");
                sw.Write("\r\r\n\t");
                sw.Write("<project>");
                sw.Write("\r\r\n\t\t\t");
                sw.Write("<label>" + name + "</label>");
                sw.Write("\r\r\n\t\t\t");
                sw.Write("<showfiles>false</showfiles>");
                sw.Write("\r\r\n\t\t");
                sw.Write("</project>");
                sw.Write("\r\r\n\t");
                sw.Write("</projects>");
                sw.Write("\r\r\n\t");
                sw.Write("<open_files>");
                sw.Write("\r\r\n\t\t");
               
                sw.Write("<docitem>");
                sw.Write("\r\r\n\t\t\t");

                sw.Write("<path>"+name+@"\Program.java</path>");
                sw.Write("\r\r\n\t\t\t");
                sw.Write("<source>true</source>");
                sw.Write("\r\r\n\t\t\t");
                sw.Write("<index>0</index>");
                sw.Write("\r\r\n\t\t\t");
                sw.Write("<active>true</active>");
                sw.Write("\r\r\n\t\t");

                sw.Write("</docitem>");
                sw.Write("\r\r\n\t");
                sw.Write("</open_files>");
                sw.Write("\r\r\n");
                sw.Write("</workspace_user>");
                sw.Flush();
                sw.Close();
            }
            catch (Exception ex)
            {
                MessageBox.Show("错误的输出" + ex.Message);
            }
        }

 

 

stream插入行的方式，并写入文件，stream读取数据可能会失真,所以最后放弃了这种方法

internal void modify_stream_jcw(string name, string path, string path2)
        {
            //MessageBox.Show(path + @"/" + path2);
            try
            {
                //使用StreamReader类来读取文件
                StreamReader sr = new StreamReader(path + @"/" + path2);
                sr.BaseStream.Seek(0, SeekOrigin.Begin);

                //准备写temp文件
                StreamWriter sw = File.AppendText(path + @"/temp.jcw");

                StringBuilder sb = new StringBuilder(128);
                while (sb.Append(sr.ReadLine())!=null)
                {
                    if (sb.ToString().Trim().Length == 0)
                        break;

                    if (!sb.ToString().Contains("</projects>"))
                    {
                        sw.Write(sb.ToString());
                    }
                    else
                    {
                        sw.Write("<project>");
                        sw.Write("\r\r\n\t");
                        sw.Write("<path>" + name + @"\" + name + ".jcp</path>");
                        sw.Write("\r\r\n\t");
                        sw.Write("</project>");
                        sw.Write("\r\r\n\t");
                        sw.Write(sb.ToString());
                    }
                    MessageBox.Show(sb.ToString());
                    sb.Remove(0,sb.Length);
                    //sb.Append(sr.ReadLine());
                }
                //关闭此StreamReader对象
                //MessageBox.Show(sb.ToString());

                sr.Close();

                sw.Flush();
                sw.Close();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString());
            }

        }