Entity Framework 6 set connection string in code

Entity Framework 6 set connection string in code

You can set the connection string for an Entity Framework 6 context in code by passing the connection string to the context's constructor.

Here's an example:

using System.Data.Entity; public class MyContext : DbContext { public MyContext(string connectionString) : base(connectionString) { } public DbSet<MyEntity> MyEntities { get; set; } }

In this example, we're creating a MyContext class that inherits from DbContext. We're passing a connection string to the base constructor of the context. The connection string can be a full connection string or just the name of a connection string in the app.config or web.config file.

To create an instance of the context with a connection string, you can call the constructor with the connection string as a parameter. Here's an example:

string connectionString = "Data Source=MyServer;Initial Catalog=MyDatabase;Integrated Security=True"; using (var context = new MyContext(connectionString)) { // Use the context here. }

In this example, we're creating a connection string and passing it to the MyContext constructor to create an instance of the context. We're using the context within a using statement to ensure that it is disposed of properly when we're done using it.

Note that if you don't pass a connection string to the context's constructor, Entity Framework will look for a connection string with the same name as the context class in the app.config or web.config file.

Examples

  1. Entity Framework 6 set connection string in code example

    var connectionString = "YourConnectionStringHere"; var dbContext = new YourDbContext(connectionString);

    This code snippet demonstrates setting the connection string when instantiating your DbContext class.

  2. C# Entity Framework 6 set connection string dynamically

    var dbContext = new YourDbContext(); dbContext.Database.Connection.ConnectionString = "YourConnectionStringHere";

    By accessing the Database.Connection.ConnectionString property, you can dynamically assign a connection string to your DbContext instance.

  3. Entity Framework 6 set connection string from configuration file

    var connectionString = ConfigurationManager.ConnectionStrings["YourConnectionStringName"].ConnectionString; var dbContext = new YourDbContext(connectionString);

    Retrieve the connection string from your application's configuration file and pass it to your DbContext constructor.

  4. C# Entity Framework 6 set connection string in web.config or app.config

    <connectionStrings> <add name="YourConnectionStringName" connectionString="YourConnectionStringHere" providerName="System.Data.SqlClient" /> </connectionStrings>

    Define your connection string in the <connectionStrings> section of your web.config or app.config file.

  5. Entity Framework 6 code-first set connection string

    public class YourDbContext : DbContext { public YourDbContext() : base("YourConnectionStringName") { } }

    When defining a code-first DbContext class, pass the connection string name to the base class constructor.

  6. C# Entity Framework 6 change connection string at runtime

    var dbContext = new YourDbContext("InitialConnectionString"); dbContext.Database.Connection.ConnectionString = "NewConnectionString";

    After instantiating your DbContext class, you can change the connection string dynamically by modifying the Database.Connection.ConnectionString property.

  7. Entity Framework 6 set connection string with integrated security

    var connectionString = "Data Source=YourServer;Initial Catalog=YourDatabase;Integrated Security=True"; var dbContext = new YourDbContext(connectionString);

    If your connection string includes integrated security, you can set it directly when instantiating your DbContext class.

  8. C# Entity Framework 6 set connection string using SqlConnectionStringBuilder

    var builder = new SqlConnectionStringBuilder(); builder.DataSource = "YourServer"; builder.InitialCatalog = "YourDatabase"; builder.IntegratedSecurity = true; var connectionString = builder.ToString(); var dbContext = new YourDbContext(connectionString);

    Use SqlConnectionStringBuilder to construct your connection string dynamically, providing more flexibility and ease of configuration in your code.

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