读写注册表

使用
RegistryManager rwRgs=new RegistryManager() ;
        private void button4_Click(object sender, System.EventArgs e)
        {
            string str1=rwRgs.ReadSettings("myName") ;
            if(str1!="")
                MessageBox.Show(str1) ;
        
        }


        private void button5_Click(object sender, System.EventArgs e)
        {
            if(rwRgs.SaveSettings("myName","furenjun"+System.DateTime.Now.ToString()))
                MessageBox.Show("save Success") ;

  
        }

        private void button6_Click(object sender, System.EventArgs e)
        {
            if(rwRgs.DeleteValue("myName"))
                MessageBox.Show("del Success") ;
        }

        private void button7_Click(object sender, System.EventArgs e)
        {
             if(rwRgs.CountValue() >0)
                 MessageBox.Show (rwRgs.CountValue().ToString() );
        }

        private void button8_Click(object sender, System.EventArgs e)
        {

            string[] str1=rwRgs.GetSubKeyValueNames();
            str1=rwRgs.GetMySubKeyNames();  
            if(str1!=null)
            {
                
                int i=str1.Length;
                MessageBox.Show(i.ToString() ) ;
                string s1="";
                for(int j=0;j<i;j++)
                {
                    s1+=str1[j]+" ";
                }
                MessageBox.Show(s1.ToString() ) ;

            }
        }

        private void button9_Click(object sender, System.EventArgs e)
        {
            MessageBox.Show ( Application.ProductName);
        }

using System;
using System.Windows.Forms;
using Microsoft.Win32;
namespace ReadWriteRegiest
{
    /**//// <summary>
    /// RegistryManager 的摘要说明。
    /// </summary>
    public class RegistryManager
    {
        public RegistryManager()
        {
            //
            // TODO: 在此处添加构造函数逻辑
            //
        }

        string myKeyStr="frj";
        string mySubKeyStr="frjChild";
        public string myKey
        {
            get{return myKeyStr;}
            set{myKeyStr=value;}

        }

        public string mySubKey
        {
            get{return mySubKeyStr;}
            set{mySubKeyStr=value;}

        }
        
        /**//// <summary>
        /// 保存键值
        /// </summary>
        /// <param name="mySetValueName"></param>
        /// <param name="mySetValue"></param>
        /// <returns></returns>
        public  bool SaveSettings(string mySetValueName,string mySetValue)
        {
            

            RegistryKey softwareKey=Registry.LocalMachine.OpenSubKey("Software\\Microsoft\\Windows",true);
            RegistryKey frjKey=softwareKey.CreateSubKey(myKey) ;
            RegistryKey frjSubKey=frjKey.CreateSubKey(mySubKey) ;
            try
            {    
                frjSubKey.SetValue(mySetValueName,mySetValue) ;
            }
            catch(System.Exception e1)
            {
                MessageBox.Show(e1.ToString(),"保存键值错误",MessageBoxButtons.OK ,MessageBoxIcon.Information );

                frjSubKey.Close();
                frjKey.Close();
                return false;
            }

            frjSubKey.Close();
            frjKey.Close();
            return true;
        }


        /**//// <summary>
        /// 读键值
        /// </summary>
        /// <param name="mySetValueName"></param>
        /// <returns></returns>
        public string  ReadSettings(string mySetValueName)
        {
            string ReadValueStr="";
            
            RegistryKey softwareKey=Registry.LocalMachine.OpenSubKey("Software\\Microsoft\\Windows",true);
            RegistryKey frjKey=softwareKey.OpenSubKey(myKey) ;
            if(frjKey==null)
            {
                frjKey.Close();
                return ReadValueStr;
            }
            RegistryKey frjSubKey=frjKey.OpenSubKey (mySubKey) ;
            try
            {    
                if(frjSubKey==null)
                {
                    frjSubKey.Close();
                    frjKey.Close();
                    return ReadValueStr;
                }
                ReadValueStr=frjSubKey.GetValue(mySetValueName).ToString()  ;
            }
            catch(System.Exception e1)
            {
                MessageBox.Show(e1.ToString(),"读注册表错误",MessageBoxButtons.OK ,MessageBoxIcon.Information );

            }
            
            frjSubKey.Close();
            frjKey.Close();
            return ReadValueStr;
            

        }


        /**//// <summary>
        /// 删除键值
        /// </summary>
        /// <param name="mySetValueName"></param>
        /// <returns></returns>
        public bool DeleteValue(string mySetValueName)
        {
            
            
            //                RegistryKey MyReg = Registry.CurrentUser.OpenSubKey
            //                ("SOFTWARE\\SomeCompany\\SomeApp\\SomeVer", true);

            RegistryKey softwareKey=Registry.LocalMachine.OpenSubKey("Software\\Microsoft\\Windows",true);
            
            RegistryKey frjKey=softwareKey.OpenSubKey(myKey) ;
            if(frjKey==null)
            {
                frjKey.Close();
                return false;
            }
            RegistryKey frjSubKey=frjKey.OpenSubKey (mySubKey) ;
            try
            {    
                if(frjSubKey==null)
                {
                    frjSubKey.Close();
                    frjKey.Close();
                    
                    return false;
                }
                //frjSubKey.DeleteSubKeyTree(mySubKey) ; //递归删除子项和任何子级子项。字符串 subKey 不区分大小写。
                //                备注
                //必须具有适当权限才能删除子项及其目录树。
                //警告   删除特定的项将移除目录树中该项下的所有项，并且不提供任何警告。
                //如果想仅在子项没有子级子项时才删除该子项，请改用 DeleteSubKey。

                frjSubKey.DeleteValue(mySetValueName,true);


            }
            catch(System.Exception e1)
            {
                MessageBox.Show(e1.ToString(),"删除键值出错",MessageBoxButtons.OK ,MessageBoxIcon.Information );
                
                frjSubKey.Close();
                frjKey.Close();
                return false;

            }
            
            frjSubKey.Close();
            frjKey.Close();
            return true;
            
        }


        /**//// <summary>
        /// 检索项中值的计数
        /// </summary>
        /// <returns></returns>
        public int  CountValue( )
        {
            int i=0;
            RegistryKey softwareKey=Registry.LocalMachine.OpenSubKey("Software\\Microsoft\\Windows",true);
            RegistryKey frjKey=softwareKey.OpenSubKey(myKey) ;
            if(frjKey==null)
            {
                frjKey.Close(); 
                return i;
            }
                
            RegistryKey frjSubKey=frjKey.OpenSubKey (mySubKey) ;
            try
            {    
                if(frjSubKey==null)
                {
                    frjSubKey.Close();
                    frjKey.Close();
                    return i;
                }
                
            }
            catch(System.Exception e1)
            {
                MessageBox.Show(e1.ToString(),"统计检索项中值出错",MessageBoxButtons.OK ,MessageBoxIcon.Information );
                frjSubKey.Close();
                frjKey.Close();
                return 0;

            }
            
            i=frjSubKey.ValueCount;  
            frjSubKey.Close();
            frjKey.Close();

            return i;
        }

         

        /**//// <summary>
        /// 检索与此项值关联的所有值名称的字符串数组
        /// </summary>
        /// <returns></returns>
        public string[] GetSubKeyValueNames()
        {
            string[] ValueNames=null; 
            RegistryKey softwareKey=Registry.LocalMachine.OpenSubKey("Software\\Microsoft\\Windows",true);
            RegistryKey frjKey=softwareKey.OpenSubKey(myKey) ;
            if(frjKey==null)
            {
                frjKey.Close(); 
                return ValueNames;
            }
                
            RegistryKey frjSubKey=frjKey.OpenSubKey (mySubKey) ;
            try
            {    
                if(frjSubKey==null)
                {
                    frjSubKey.Close();
                    frjKey.Close();
                    return ValueNames;
                }
                ValueNames=frjSubKey.GetValueNames() ;
            }
            catch(System.Exception e1)
            {
                MessageBox.Show(e1.ToString(),"统计检索项中值出错",MessageBoxButtons.OK ,MessageBoxIcon.Information );
                frjSubKey.Close();
                frjKey.Close();
                return ValueNames;

            }
            
              
            frjSubKey.Close();
            frjKey.Close();

            return ValueNames;

        }


        
        /**//// <summary>
        /// To obtain a list of all the subkeys (child keys) that exist within your present RegistryKey object
        /// </summary>
        /// <returns></returns>
        public string[] GetMySubKeyNames()
        {
            string[] mySubKeyNames=null; 
            RegistryKey softwareKey=Registry.LocalMachine.OpenSubKey("Software\\Microsoft\\Windows",true);
            RegistryKey frjKey=softwareKey.OpenSubKey(myKey) ;
            if(frjKey==null)
            {
                frjKey.Close(); 
                return mySubKeyNames;
            }
            mySubKeyNames=frjKey.GetSubKeyNames();  

            RegistryKey frjSubKey=frjKey.OpenSubKey (mySubKey) ;
            try
            {    
                if(frjSubKey==null)
                {
                    frjSubKey.Close();
                    frjKey.Close();
                    return mySubKeyNames;
                }
                //mySubKeyNames=frjSubKey.GetSubKeyNames()  ;
            }
            catch(System.Exception e1)
            {
                MessageBox.Show(e1.ToString(),"统计检索项中值出错",MessageBoxButtons.OK ,MessageBoxIcon.Information );
                frjSubKey.Close();
                frjKey.Close();
                return mySubKeyNames;

            }
            
              
            frjSubKey.Close();
            frjKey.Close();

            return mySubKeyNames;

        }

        public bool AutoRunProgram()
        {
            
            string Pname=Application.ProductName;
            string ProgramNameAndPath= Application.StartupPath+@"\"+Pname+".exe";
            RegistryKey softwareKey=Registry.LocalMachine.OpenSubKey("Software\\Microsoft\\Windows\\CurrentVersion\\Run",true);
            try
            {
                if(softwareKey==null)
                {
                    //如果子键不存在则创建之
                    softwareKey=Registry.LocalMachine.CreateSubKey("Software\\Microsoft\\Windows\\CurrentVersion\\Run");

                }
                string[] CheckPname=softwareKey.GetValueNames(); 
                int i=CheckPname.Length;
//                MessageBox.Show(i.ToString() ) ;
                bool find=false;
                int j=0;
                while(j<i && !find)
                {
                    if(CheckPname[j]==Pname)
                    {    
                        find=true;
//                        MessageBox.Show(j.ToString() +"   "+CheckPname[j] );
                    }
                    j++;

                }
                 
                if(!find)   
                {
                    //在注册表中设置自动启动程序
                    softwareKey.SetValue(Pname, ProgramNameAndPath) ;
                }
                else
                {
                    if(softwareKey.GetValue(Pname).ToString() !=ProgramNameAndPath )
                        softwareKey.SetValue(Pname, ProgramNameAndPath) ;
//                    else
//                        MessageBox.Show("已经有了") ;
                }
            }
            catch
            {
                softwareKey.Close();  
                return false;
            }
            softwareKey.Close(); 
            return true;
        }

    }
}