相关疑难解决方法(0)

当我使用默认连接字符串(从中读取app.config)创建上下文时,将创建数据库并且迁移工作 - 基本上所有内容都是有序的.而以编程方式(使用SqlConnectionStringBuilder)创建连接字符串时:

• 数据库不存在时不创建数据库(场景A);
• CreateDbIfNotExists()创建最新版本的数据库模型,但不调用迁移机制(方案B).

在A我希望访问数据库时抛出异常,因为 - 显然 - 它不在那里.在B数据库中创建正确的迁移机制不会被调用,就像标准连接字符串中的情况一样.

app.config:" Data Source=localhost\\SQLEXPRESS;Initial Catalog=Db13;User ID=xxx;Password=xxx"

建设者:

sqlBuilder.DataSource = x.DbHost;
sqlBuilder.InitialCatalog = x.DbName;
sqlBuilder.UserID = x.DbUser;
sqlBuilder.Password = x.DbPassword;

初始化程序:

Database.SetInitializer(
    new MigrateDatabaseToLatestVersion<
        MyContext,
        Migrations.Configuration
    >()
);

规范:实体框架:5.0,DB:SQL Server Express 2008

我有一个自定义DatabaseInitialiser,如下所示

/// <summary>
/// Implements the IDatabaseInitializer to provide a custom database initialisation for the context.
/// </summary>
/// <typeparam name="TContext">TContext is the DbContext</typeparam>
public class ParikshaDataBaseInitializer<TContext> : IDatabaseInitializer<TContext> where TContext : DbContext
{
    /// <summary>
    /// The method to Initialise the database.
    /// Takes care of the database cannot be dropped since it is in use problem while dropping and recreating the database.
    /// </summary>
    /// <param name="context">The DbContext on which to run the initialiser</param>
    public void InitializeDatabase(TContext context) …