EF代码首先在使用sqlclient provider启动时创建数据库

Question

I'm trying to create a database on startup with this code:

class DataContext : DbContext
{
    public DbSet<Student> Students { get; set; }

    public DataContext() : base("Database")
    {
        Database.Initialize(true);

    }

}

/////////
try
{
var db = new DataContext();

db.Students.Add(new Student());

db.SaveChanges();
}

catch (Exception ex)
{

}

//app.config

<configuration>
  <configSections>
    <!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
    <section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
  </configSections>
    <connectionStrings>
        <add name="Database"
            connectionString="Server=(localdb)\v11.0;Integrated Security=true;
            AttachDbFileName=C:\Users\Aaron\Documents\visual studio 2015\Projects\EF Test\EF Test\bin\Debug\MyData.mdf"
            providerName="System.Data.SqlClient"/>
    </connectionStrings>
  <startup>
    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
  </startup>
  <entityFramework>
    <defaultConnectionFactory type="System.Data.Entity.Infrastructure.LocalDbConnectionFactory, EntityFramework">
      <parameters>
        <parameter value="mssqllocaldb" />
      </parameters>
    </defaultConnectionFactory>
    <providers>
      <provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
    </providers>
  </entityFramework>

I think my connection string is bad. I've tried about a dozen with no luck. I get an exception on my Initialize call. "An attempt to attach an auto-named database for file failed". thanks for the help.

EDIT Changed this:

<connectionStrings>
<add name="Database"
        connectionString="Server=(localdb)\v11.0;Integrated Security=true;
        database=C:\Users\Aaron\Documents\visual studio 2015\Projects\EF Test\EF Test\bin\Debug\MyData.mdf"
        providerName="System.Data.SqlClient"/>
</connectionStrings>\

and now i get "Additional information: Cannot open database "C:\\Users\\Aaron\\Documents\\visual studio 2015\\Projects\\EF Test\\EF Test\\bin\\Debug\\MyData.mdf" requested by the login. The login failed."

Answer 1

Try

    <connectionStrings>
        <add name="Database"
             connectionString="Data Source=(LocalDb);Database=MyData.mdf;Trusted_Connection=True" />
    </connectionStrings>

Answer 2

See here.

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <connectionStrings>
    <add name="SchoolDBConnectionString" 
    connectionString="Data Source=(localdb)\v11.0;Initial Catalog=SchoolDB-ByConnectionString;Integrated Security=true" 
    providerName="System.Data.SqlClient"/>
  </connectionStrings>
</configuration>

So Code First will create a new SchoolDB-ByConnectionString database.

Answer 3

Figured it out. So I created a local database in visual studios Server Explorer->Connect to database. Once I created the database I copied the connection string that looks like this:

<add name="dbtest" connectionString="Data Source=(LocalDB)\MSSQLLocalDB;AttachDbFilename=C:\Users\Aaron\Desktop\mydb.mdf;Integrated Security=True" providerName="System.Data.SqlClient"/>

and bam worked like a charm. Thanks all for the help.