Question

我有一个从ObjectContext继承的类：

public class MyObjectContext: ObjectContext {

   [.....]

    public MyObjectContext()
        : base("name=MyObjectContext", "MyObjectContext")
    {
        ContextOptions.LazyLoadingEnabled = true;
    }

    public MyObjectContext(string connectionString)
        : base(connectionString, "MyObjectContext")
    {
        ContextOptions.LazyLoadingEnabled = true;
    }

    [.....]
}

还有一个配置文件，我有一个用于db的连接字符串：

  <connectionStrings>
      <add name="RepoContext"
           connectionString="metadata=res://*/Repo.RepoModel.csdl|res://*/Repo.RepoModel.ssdl|res://*/Repo.RepoModel.msl;provider=System.Data.SqlServerCe.4.0;provider connection string=&quot;Data Source=|DataDirectory|\MyDb.sdf;Password=12345&quot;"
           providerName="System.Data.EntityClient" />
  </connectionStrings>

也就是说，我想从配置文件中完全删除密码，并在MyObjectContext类内部动态加载它-密码。其余的connectionString必须保留在配置中。

我该怎么做？

我不想加密配置文件中的connectionString。

Answer 1

您可以将基本构造函数与带有连接字符串的重载一起使用：

public MyObjectContext(string connectionString)
                 : base(connectionString)
{
     ContextOptions.LazyLoadingEnabled = true;
}

并这样称呼它：

var cxt = new MyObjectContext(new EntityConnectionStringBuilder() {
                Metadata= "metadata=res://*/Repo.RepoModel.csdl|res://*/Repo.RepoModel.ssdl|res://*/Repo.RepoModel.msl;provider=System.Data.SqlServerCe.4.0;provider connection string=&quot;Data Source=|DataDirectory|\MyDb.sdf;Password=+"PASSWORD"+&quot;",
                Provider = "System.Data.EntityClient"
            }.ConnectionString);

Answer 2

像这样从MyObjectContext的构造函数调用函数

 public MyObjectContext()
        : base(GetConnectionString())
    {
        ContextOptions.LazyLoadingEnabled = true;
    }

在您的函数中获取连接字符串

private static string GetConnectionString()
{
  var connectStringValue = ConfigurationManager.ConnectionStrings["MyObjectContext"].ConnectionString;
  var entityBuilder = new EntityConnectionStringBuilder(connectStringValue);
  var factory = DbProviderFactories.GetFactory(entityBuilder.Provider);
  var providerBuilder = factory.CreateConnectionStringBuilder();

  if (providerBuilder == null)
        return entityBuilder.ToString();

  providerBuilder.ConnectionString = entityBuilder.ProviderConnectionString;
  providerBuilder.Add("Password", "**yourpassword**");

  entityBuilder.ProviderConnectionString = providerBuilder.ToString();

  return entityBuilder.ToString();
}

希望这会有所帮助

在配置文件中将ObjectContext与connectionString一起使用并动态加载密码

2 个答案: