Entity Framework 3.5：更改实体类的构造函数

发布于 2024-12-17 15:21:33 字数 441 浏览 0 评论 0原文

生成的实体框架实体文件中的默认构造函数是这样的：

public ProjectEntities() : base("name=ProjectEntities", "ProjectEntities")
{
    this.OnContextCreated();
}

我想将其更改为：

public ProjectEntities() : base(UtilClass.GetEnvDependantConnectionStringName(), "ProjectEntities")
{
    this.OnContextCreated();
}

这是因为我希望所有开发环境和生产环境都有不同的连接字符串，并且不可能将它们混淆（这是我的自定义方法检查的内容）。

我该怎么做？每次重新生成设计器文件时都会丢弃此代码。

原文

The default constructor in a generated Entity Framework Entities file is like this:

public ProjectEntities() : base("name=ProjectEntities", "ProjectEntities")
{
    this.OnContextCreated();
}

I want to change it to:

public ProjectEntities() : base(UtilClass.GetEnvDependantConnectionStringName(), "ProjectEntities")
{
    this.OnContextCreated();
}

This is because I want to have a different connection string for all the dev environments and the production environment, and have no chance they are mixed up (which is what my custom method checks).

How do I do that? This code is thrown away every time the designer file is regenerated.

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云之铃。 2024-12-24 15:21:33

您需要在自动创建的 ProjectEntities.Designer.cs 旁边创建另一个文件，例如 ProjectEntities.cs。因为您使用部分来扩展实体类的功能，如下所示：

public partial class ProjectEntities : ObjectContext
{
  partial void OnContextCreated()
  {
    this.Connection.ConnectionString = UtilClass.GetEnvDependantConnectionString();
  }
}

当您重新生成 .Designer.cs 文件时，该文件不会发生更改。您必须自己获取连接字符串......

You need to create another file alongside the auto-created ProjectEntities.Designer.cs, say ProjectEntities.cs. In that you use partial to extend the functionality of your entities class like this:

public partial class ProjectEntities : ObjectContext
{
  partial void OnContextCreated()
  {
    this.Connection.ConnectionString = UtilClass.GetEnvDependantConnectionString();
  }
}

The file won't then get changed when you regenerate the .Designer.cs file. You'll have to fetch the connection string yourself...

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阿楠 2024-12-24 15:21:33

我们通过调用我们的实体 ProjectEntitiesPrivate 来修复它，之前的 partial class ProjectEntities 现在是一个非partial class ProjectEntities : ProjectEntitiesPrivate，具有我需要的构造函数：

public class ProjectEntities: ProjectEntitiesPrivate
{
    public ProjectEntities():base(UtilClass.GetEnvDependantConnectionStringName())
    {

    }

....

We fixed it by calling our entities ProjectEntitiesPrivate, and what was partial class ProjectEntities before, is now a non partial class ProjectEntities : ProjectEntitiesPrivate, with the constructor I need:

public class ProjectEntities: ProjectEntitiesPrivate
{
    public ProjectEntities():base(UtilClass.GetEnvDependantConnectionStringName())
    {

    }

....

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