C#操作注册表的方法

using microsoft.win32 ;  

1.读取指定名称的注册表的值  

private string getregistdata(string name)
{
string registdata;
registrykey hkml = registry.localmachine;
registrykey software = hkml.opensubkey("software",true);
registrykey aimdir = software.opensubkey("xxx",true);
registdata = aimdir.getvalue(name).tostring();
return registdata;
}

以上是读取的注册表中hkey_local_machine\software目录下的xxx目录中名称为name的注册表值； 

2.向注册表中写数据  

private void wtregedit(string name,string tovalue)
{
registrykey hklm = registry.localmachine;
registrykey software = hklm.opensubkey("software",true);
registrykey aimdir = software.createsubkey("xxx");
aimdir.setvalue(name,tovalue);
}

以上是在注册表中hkey_local_machine\software目录下新建xxx目录并在此目录下创建名称为name值为tovalue的注册表项； 

3.删除注册表中指定的注册表项  

private void deleteregist(string name)
{
string[] aimnames;
registrykey hkml = registry.localmachine;
registrykey software = hkml.opensubkey("software",true);
registrykey aimdir = software.opensubkey("xxx",true);
aimnames = aimdir.getsubkeynames();
foreach(string aimkey in aimnames)
{
if(aimkey == name)
aimdir.deletesubkeytree(name);
}
}

以上是在注册表中hkey_local_machine\software目录下xxx目录中删除名称为name注册表项； 

4.判断指定注册表项是否存在  

private bool isregeditexit(string name)
{
bool _exit = false;
string[] subkeynames;
registrykey hkml = registry.localmachine;
registrykey software = hkml.opensubkey("software",true);
registrykey aimdir = software.opensubkey("xxx",true);
subkeynames = aimdir.getsubkeynames();
foreach(string keyname in subkeynames)
{
if(keyname == name)
{
_exit = true;
return _exit;
}
}
return _exit;
}

以上是在注册表中hkey_local_machine\software目录下xxx目录中判断名称为name注册表项是否存在，这一方法在删除注册表时已经存在，在新建一注册表项时也应有相应判断； 

using system.windows.forms;
using microsoft.win32;

namespace regeditmanager
{
    public partial class form1 : form
    {
        public form1()
        {
            initializecomponent();
        }
        //创建并写入
        private void button1_click(object sender, eventargs e)
        {
            registrykey key = registry.localmachine;
            try
            {
                registrykey software = key.createsubkey("software\\labmanager");
                software = key.opensubkey("software\\labmanager", true);
                software.setvalue("address", @"c:\program files\实验室管理系统\dbcom.xml");
            }
            catch (exception ex)
            {
                messagebox.show(ex.tostring());
            }
            finally
            {
                key.close();
            }
        }
        //读取
        private void button2_click(object sender, eventargs e)
        {
            string info = string.empty;
            registrykey key=registry.localmachine;
            try
            {
                key = key.opensubkey("software\\labmanager");
                if (isregeditkeyexit("software\\labmanager", "address"))
                {
                    info = key.getvalue("address").tostring();
                    messagebox.show("注册表里的信息为:" + info);
                }
                else
                {
                    messagebox.show("键值address不存在;");
                }
            }
            catch (exception ex)
            {
                messagebox.show(ex.tostring());
            }
            finally
            {
                key.close();
            }
        }
        //删除
        private void button3_click(object sender, eventargs e)
        {
            registrykey key = registry.localmachine;
            try
            {
                key = key.opensubkey("software\\labmanager",true);
                if (isregeditkeyexit("software\\labmanager", "address"))
                {
                    key.deletevalue("address");
                    messagebox.show("删除成功");
                }
                else
                {
                    messagebox.show("键值address不存在;");
                }
            }
            catch (exception ex)
            {
                messagebox.show(ex.tostring());
            }
            finally
            {
                key.close();
            }
        }

        /// <summary>
        /// 判断键值是否存在
        /// </summary>
        /// <param name="registrystr">注册表项</param>
        /// <param name="keystr">键值</param>
        /// <returns></returns>
        private bool isregeditkeyexit(string registrystr,string keystr)
        {
            string[] subkeynames;

            registrykey hkml = registry.localmachine;

            registrykey software = hkml.opensubkey(registrystr);

            subkeynames = software.getvaluenames();

            foreach (string keyname in subkeynames)
            {
                if (keyname == keystr)  //判断键值的名称
                {
                    hkml.close();

                    return true;
                }
            }
            hkml.close();

            return false;
        }

        /// <summary>
        /// 判断注册表项是否存在
        /// </summary>
        /// <param name="registryname">例如:software</param>
        /// <param name="valuestr">例如:labmanager</param>
        /// <returns></returns>
        private bool isregedititemexist(string registryname,string valuestr)
        {
            string[] subkeynames;

            registrykey hkml = registry.localmachine;

            registrykey software = hkml.opensubkey(registryname);

            subkeynames = software.getsubkeynames();

            //取得该项下所有子项的名称的序列，并传递给预定的数组中

            foreach (string keyname in subkeynames)  //遍历整个数组
            {
                if (keyname == valuestr) //判断子项的名称
                {
                    hkml.close();
                    return true;
                }
            }
            hkml.close();
            return false;

        }
    }
}