C#对INI文件进行读写操作的示例代码

 string filePath;
        private void btnModify_Click(object sender, EventArgs e)
        {
            if (string.IsNullOrEmpty(filePath) || !File.Exists(filePath))
            {
                using (SaveFileDialog sfd=new SaveFileDialog())
                {                    
                    sfd.Filter= "初始化文件(*.INI)|*.INI";
                    if (sfd.ShowDialog() == DialogResult.OK)
                    {
                        FileStream fs = System.IO.File.Create(sfd.FileName);
                        fs.Dispose();
                        filePath = sfd.FileName;
                    }
                }
            }
            INIHelper.WriteToINI(filePath, "ConnectString", "Data Source", txtServer.Text);
            INIHelper.WriteToINI(filePath, "ConnectString", "DataBase", txtDataBase.Text);
            INIHelper.WriteToINI(filePath, "ConnectString", "Uid", txtSid.Text);
            INIHelper.WriteToINI(filePath, "ConnectString", "Pwd", txtPwd.Text);
            MessageBox.Show("保存成功！");
        }
 
        private void Form1_Load(object sender, EventArgs e)
        {
 
        }
 
        private void toolStripButton1_Click(object sender, EventArgs e)
        {
            using(OpenFileDialog ofd=new OpenFileDialog())
            {
                ofd.Filter = "初始化文件(*.INI)|*.INI";
                ofd.Multiselect = false;
                if (ofd.ShowDialog() == DialogResult.OK)
                {
                     filePath = ofd.FileName;
                    string source = INIHelper.ReadFromINI(filePath, "ConnectString", "Data Source");
                    string dataName= INIHelper.ReadFromINI(filePath, "ConnectString", "DataBase");
                    string uid= INIHelper.ReadFromINI(filePath, "ConnectString", "Uid", "未设置");
                    string pwd= INIHelper.ReadFromINI(filePath, "ConnectString", "Pwd","未设置");
                    txtServer.Text = source;
                    txtDataBase.Text = dataName;
                    txtSid.Text = uid;
                    txtPwd.Text = pwd;
                }
            }
        }
    }
    /// <summary>
    /// 对INI文件进行读写
    /// </summary>
    class INIHelper
    {
        /// <summary>
        /// 从INI文件中读取数据
        /// </summary>
        /// <param name="filePath">INI文件的全路径</param>
        /// <param name="rootValue">根节点值，例如根节点[ConnectString]的值为：ConnectString</param>
        /// <param name="key">根节点下的键</param>
        /// <param name="defValue">当标记值未设定或不存在时的默认值</param>
        /// <returns></returns>
        public static string ReadFromINI(string filePath, string rootValue,string key,string defValue="")
        {
            StringBuilder sb = new StringBuilder(1024);
            GetPrivateProfileString(rootValue, key, defValue, sb, 1024, filePath);
            return sb.ToString();
        }
        public static void WriteToINI(string filePath, string rootValue, string key, string newVal)
        {
           
            WritePrivateProfileString(rootValue, key, newVal, filePath);
           
        }
        
        /// <summary>
        /// 对INI文件进行读取操作
        /// </summary>
        /// <param name="IpAppName">表示INI文件内部根节点的值</param>
        /// <param name="IpKeyName">表示根节点下子标记的值</param>
        /// <param name="IpDefault">表示当标记值未设定或不存在时的默认值</param>
        /// <param name="IpReturnString">返回读取节点的值</param>
        /// <param name="nSize">读取的节点内容的最大容量</param>
        /// <param name="IpFileName">文件的全路径</param>
        /// <returns></returns>
        [System.Runtime.InteropServices.DllImport("kernel32")]
        static extern int GetPrivateProfileString(string IpAppName, string IpKeyName, string IpDefault, StringBuilder IpReturnString, int nSize, string IpFileName);
        /// <summary>
        /// 对INI文件进行写入操作
        /// </summary>
        /// <param name="mpAppName">INI文件内部根节点的值</param>
        /// <param name="mpKeyName">将要修改的标记名称</param>
        /// <param name="mpDefault">想要修改的内容</param>
        /// <param name="mpFileName">INI文件的全路径</param>
        /// <returns></returns>
        [System.Runtime.InteropServices.DllImport("kernel32")]
        static extern long WritePrivateProfileString(string mpAppName, string mpKeyName, string mpDefault, string mpFileName);
    }