SQL数据库无法在第二台PC上初始化，并显示消息“底层提供程序无法打开”

Question

I have a VSExpress 2013 solution (with 3 projects) with Entity Framework (ADO.NET) accessing a SQL Server database. I am able to publish my project to the original source PC, and it works as expected, but attempting to install on a second PC via CD fails. The installation is failing to instantiate or create the necessary database files on the local SQL Server (localDB), although SQL Server Express (LocalDB) installs correctly.

I tried adding the line:

Database.SetInitializer<PMMEntities>(new CreateDatabaseIfNotExists<PMMEntities>());

to MainWindow() on start-up to initialise the database. However, I still get the following error on running the application on the other PC:

A network-related or instance specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the the instance name is correct and that SQL Server is configured to allow remote connections. (provider: SQL Network Interfaces. error:26 - Error locating Server/Instance Specified)

The connection string in app.config is (note that I am not trying to access a shared database on a network, and each installation on another PC must create and run its own local DB):

<connectionStrings>
    <add name="PMMEntities" 
         connectionString="metadata=res://*/PMMData.csdl|res://*/PMMData.ssdl|res://*/PMMData.msl;provider=System.Data.SqlClient;provider connection string=&quot;data source=.\SQLEXPRESS;initial catalog=PMM;integrated security=True;MultipleActiveResultSets=True;App=EntityFramework&quot;" 
         providerName="System.Data.EntityClient" />
</connectionStrings>

I am using ClickOnce settings. What do I need to do to achieve effective installation on other PCs so that they will instantiate a new database on first execution?

Answer 1

听起来好像SQL Express尚未安装在第二台PC上，或者正在使用其他实例名称安装，或者在ClickOnce部署期间安装失败。