转载：加密配置文件 和 解密配置文件 - Mini Sky

转载：加密配置文件 和 解密配置文件

ASP.NET 2.0加密网站配置文件
    /// <summary>
     /// 加密配置文件
     /// </summary>
     /// <param name="sectionName">要加密的 节（"appSettings"或"connectionStrings"）</param>
     /// <param name="provider">加密的程序名（"DataProtectionConfigurationProvider"）</param>
     private void ProtectSection(string sectionName, string provider)
     {
         Configuration config =
             System.Web.Configuration.WebConfigurationManager.
                 OpenWebConfiguration(Request.ApplicationPath);

         ConfigurationSection section = config.GetSection(sectionName);

         if (section != null && !section.SectionInformation.IsProtected)
         {
             section.SectionInformation.ProtectSection(provider);
             config.Save();
         }
     }

     /// <summary>
     /// 解密配置文件
     /// </summary>
     /// <param name="sectionName">要解密的 节 （"appSettings"或"connectionStrings"）</param>
     private void UnProtectSection(string sectionName)
     {
         Configuration config =
             System.Web.Configuration.WebConfigurationManager.
                 OpenWebConfiguration(Request.ApplicationPath);

         ConfigurationSection section = config.GetSection(sectionName);

         if (section != null && section.SectionInformation.IsProtected)
         {
             section.SectionInformation.UnprotectSection();
             config.Save();
         }
     }
WebConfig文件中包含了很多重要的配置信息,部署的时候我们需要对其进行加密.
加密方法:
在命令行中输入,
aspnet_regiis.exe      -pef "connectionStrings"      "D:\Project\Asp.netTest\"
(aspnet_regiis.exe在C:\WINDOWS\Microsoft.Net\Framework\v2.0.50727文件夹里)

-pef   对指定物理（非虚拟）目录中的 Web.config 文件的指定配置节进行加密。
对应的这个解密则是
-pdf 参数   对指定物理（非虚拟）目录中的 Web.config 文件的指定配置节进行解密。

connectionStrins是要加密的部分,后面的是工程的路径.

获取
<connectionStrings>
   <add name="CJGLConnectionString" c
    providerName="System.Data.SqlClient" />
</connectionStrings>
中的连接自符串:

         System.Configuration.ConnectionStringSettings s =   ConfigurationManager.ConnectionStrings["CJGLConnectionString"];
         this.Label1 .Text = s.ConnectionString ;
还要添加对System.Configuration.dll 文件的引用

1.写入连接字符串
protected void Page_Load(object sender, EventArgs e)
     {
         if (!Page.IsPostBack)
         {
           
           // Create a new ConnectionStringSettings object and populate it
             ConnectionStringSettings conn = new ConnectionStringSettings();
             conn.ConnectionString =
                  "Server=localhost;User ID=sa;Password=123456; " +
                  "Database=Northwind;Persist Security Info=True";
             conn.Name = "AppConnectionString2";
             conn.ProviderName = "System.Data.SqlClient";
            // Add the new connection string to the web.config
             Configuration config = System.Web.Configuration.WebConfigurationManager.OpenWebConfiguration("example");
             config.ConnectionStrings.ConnectionStrings.Add(conn);
             config.Save();
         }
     }
2.修改连接字符串
protected void Page_Load(object sender, EventArgs e)
     {
        // Retrieve an existing connection string into a Connection String Builder
         System.Data.SqlClient.SqlConnectionStringBuilder builder = new
             System.Data.SqlClient.SqlConnectionStringBuilder();
       // Change the connection string properties
         builder.DataSource = "localhost";
         builder.InitialCatalog = "Northwind1";
         builder.UserID = "sa";
         builder.Password = "password";
         builder.PersistSecurityInfo = true;
       // Save the connection string back to the web.config
         Configuration config = System.Web.Configuration.WebConfigurationManager.OpenWebConfiguration("/Chapter11");
         config.ConnectionStrings.ConnectionStrings["AppConnectionString1"].ConnectionString =
             builder.ConnectionString;
         config.Save();
     }

获取
<appSettings>
   <add key="ConnectionString" value="Data Source=218.98.101.165;Initial Catalog=HRMS;User ID=hrms;Password=123456"/>
</appSettings>
中的连接自符串:
string str = System.Configuration.ConfigurationSettings.AppSettings["ConnectionString"];