如何读取注册表项的值 c#
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How to read value of a registry key c#
提问by Scalahansolo
At start up of my application I am trying to see if the user has a specific version of a software installed, specifically the MySQL connector, all using c#. In the registry, the MySQL contains a version entry. So what I am trying to accomplish is this.
在我的应用程序启动时，我试图查看用户是否安装了特定版本的软件，特别是 MySQL 连接器，全部使用 c#。在注册表中，MySQL 包含一个版本条目。所以我想要完成的是这个。
My app starts up. Somewhere in the start up code I need to do the following things in order. Check to see if the user has the MySQL connector installed, which is located at...
我的应用程序启动。在启动代码的某个地方，我需要按顺序执行以下操作。检查用户是否安装了 MySQL 连接器，它位于...
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\MySQL AB\MySQL Connector/Net
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\MySQL AB\MySQL Connector/Net
If the user has the connector installed, I wanted to check what version they have, which is stored as Name = "Version" and Data = x.x.x (Picture below)
如果用户安装了连接器，我想检查他们有什么版本，存储为 Name = "Version" and Data = xxx (下图)
Now if the user has a specific version installed, then I will execute other code, which is where I can take from.
现在，如果用户安装了特定版本，那么我将执行其他代码，这是我可以从中获取的。
What would be the best way of going about this?
解决这个问题的最佳方法是什么？
EDIT:Below is the code I currently have and I am getting an error on line 19 (It is commented). My error says "error CS1001: Identifier Expected" I wasnt able to figure out what that means. Any help?
编辑：下面是我目前拥有的代码，我在第 19 行出现错误（已注释）。我的错误说“ error CS1001: Identifier Expected”我无法弄清楚这意味着什么。有什么帮助吗？
using System;
using Microsoft.Win32;
using System.Data;
public class regTest
{
public static void Main()
{
try
{
RegistryKey key = Registry.LocalMachine.OpenSubKey("Software\Wow6432Node\MySQL AB\MySQL Connector\Net");
if (key != null)
{
Object o = key.GetValue("Version");
if (o != null)
{
Version version = new Version(o as String); //"as" because it's REG_SZ...otherwise ToString() might be safe(r)
Version broken = new Version("6.7.4");
if (version.Equals.(broken)) //This is where the error is occuring
{
DataSet dataSet = ConfigurationManager.GetSection("system.data") as ystem.Data.DataSet;
DataView vi = dataSet.Tables[0].DefaultView;
vi.Sort = "Name";
if (vi.Find("MySql") == -1)
{
dataSet.Tables[0].Rows.Add("MySql"
, "MySql.Data.MySqlClient"
, "MySql.Data.MySqlClient"
,
typeof(MySql.Data.MySqlClient.MySqlClientFactory).AssemblyQualifiedName);
}
}
}
}
}
catch (Exception ex) //just for demonstration...it's always best to handle specific exceptions
{
//react appropriately
}
}
}
采纳答案by DonBoitnott
You need to first add using Microsoft.Win32;to your code page.
您需要先添加using Microsoft.Win32;到您的代码页。
Then you can begin to use the Registryclasses:
然后你就可以开始使用这些Registry类了：
try
{
using (RegistryKey key = Registry.LocalMachine.OpenSubKey("Software\Wow6432Node\MySQL AB\MySQL Connector\Net"))
{
if (key != null)
{
Object o = key.GetValue("Version");
if (o != null)
{
Version version = new Version(o as String); //"as" because it's REG_SZ...otherwise ToString() might be safe(r)
//do what you like with version
}
}
}
}
catch (Exception ex) //just for demonstration...it's always best to handle specific exceptions
{
//react appropriately
}
BEWARE:unless you have administrator access, you are unlikely to be able to do much in LOCAL_MACHINE. Sometimes even reading values can be a suspect operation without admin rights.
注意：除非您拥有管理员访问权限，否则您不太可能在LOCAL_MACHINE. 有时，即使读取值也可能是没有管理员权限的可疑操作。
回答by Manuel
Change:
改变：
using (RegistryKey key = Registry.LocalMachine.OpenSubKey("Software\Wow6432Node\MySQL AB\MySQL Connector\Net"))
To:
到：
using (RegistryKey key = Registry.LocalMachine.OpenSubKey("Software\Wow6432Node\MySQL AB\MySQL Connector\Net"))
