当我将数据库属性转换为不复制时，底层提供程序无法打开

Question

This is the connection string and when I change the property of the database file ( database1.mdf ) to "do not copy", it causes an error.

<connectionStrings>
    <add name="ClassLibrary1.Properties.Settings.Database1ConnectionString" 
         connectionString="Data Source=(LocalDB)\v11.0;AttachDbFilename=|DataDirectory|\Database1.mdf;Integrated Security=True" 
         providerName="System.Data.SqlClient" />
</connectionStrings>

Answer 1

That's probably because of AttachDbFilename=|DataDirectory|\\Database1.mdf that you can't not copy the database to the DataDirectory.

The connection string tries to find and attach the database from the given address and it can't find it. you can attach the db first and then use this connection strings:

<add provider connection string=&quot;data source=.;
    initial catalog=Database1;
    integrated security=True;/>