从文本读指定行C#源码

sp;    {
                    str_path = Application.StartupPath + "\\config\\" + filename;  //路径可以指定特定的路径
                    strOne = System.IO.Path.GetFileNameWithoutExtension(str_path);

                    if (File.Exists(str_path))
                    {
                        str_temp = Cont_Reader(strOne, key, "", str_path);
                    }
                }
                catch (Exception ex)
                {
                   MessageBox.Show(ex.Message, "系统温馨提示");
                }
                return str_temp;
            }

             //上个函数的字函数,读取数据,必须加载
                    public string Cont_Reader(string area, string key, string def, string fullpath)
                    {
                        StringBuilder stringBuilder = new StringBuilder(1024);
                        GetPrivateProfileString(area, key, def, stringBuilder, 1024, fullpath);
                        return stringBuilder.ToString();
                    }

             //上个函数的字函数，系统的底层函数，读取数据
                            [DllImport("kernel32")]
                            private static extern int GetPrivateProfileString(
                                string lpAppName,
                                string lpKeyName,
                                string lpDefault,
                                StringBuilder lpReturnedString,
                                int nSize,
                                string lpFileName);

注意：
1.必须加载命名空间 using System.IO;  System.Runtime.InteropServices；
2.文本文件的格式有要求，第一行必须为[文本文件名]，不带后缀
3.后续的行格式：key1=。。。。。。
        key2=。。。。。。

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