错误信息:
"The model backing the 'AddressBook' context has changed since the database was created. Either manually delete/update the database, or call Database.SetInitializer with an IDatabaseInitializer instance. For example, the RecreateDatabaseIfModelChanges strategy will automatically delete and recreate the database, and optionally seed it with new data."
我正在尝试使用代码优先功能,以下是我编写的内容:
var modelBuilder = new ModelBuilder();
var model = modelBuilder.CreateModel();
using (AddressBook context = new AddressBook(model))
{
var contact = new Contact
{
ContactID = 10000,
FirstName = "Brian",
LastName = "Lara",
ModifiedDate = DateTime.Now,
AddDate = DateTime.Now,
Title = "Mr."
};
context.contacts.Add(contact);
int result = context.SaveChanges();
Console.WriteLine("Result :- "+ result.ToString());
}
上下文类:
public class AddressBook : DbContext
{
public AddressBook()
{ }
public AddressBook(DbModel AddressBook)
: base(AddressBook)
{
}
public DbSet<Contact> contacts { get; set; }
public DbSet<Address> Addresses { get; set; }
}
和连接字符串:
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<connectionStrings>
<add name="AddressBook" providerName="System.Data.SqlClient"
connectionString="Data Source=MyMachine;Initial Catalog=AddressBook;
Integrated Security=True;MultipleActiveResultSets=True;"/>
</connectionStrings>
</configuration>
因此,数据库名称是“AddressBook”,当我尝试将联系人对象添加到上下文时,会发生错误。我在这里遗漏了什么吗?
最佳答案
现在是:
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
Database.SetInitializer<YourDbContext>(null);
base.OnModelCreating(modelBuilder);
}
在您的 YourDbContext.cs 文件中。
关于.net - 自数据库创建以来,支持 <Database> 上下文的模型已发生更改,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/3600175/