Change Entity Framework Connection at Runtime with C#

If you're working with Entity Framework in your C# project, you may encounter a scenario where you need to change the connection string at runtime. This can be necessary when you have multiple databases or need to switch between environments (e.g. development vs production).

├Źndice
  1. Step 1: Create a New Connection String
  2. Step 2: Modify the DbContext Connection
  3. Step 3: Dispose of Old DbContext Connection

Step 1: Create a New Connection String

The first step is to create a new connection string with the desired parameters. You can do this using the EntityConnectionStringBuilder class, which allows you to construct a connection string using the Entity Framework metadata and a provider connection string.

<code>
var builder = new EntityConnectionStringBuilder();
builder.Metadata = "res://*/MyModel.csdl|res://*/MyModel.ssdl|res://*/MyModel.msl";
builder.Provider = "System.Data.SqlClient";
builder.ProviderConnectionString = "Data Source=(local);Initial Catalog=MyDatabase;Integrated Security=True";
string connectionString = builder.ToString();
</code>

In this example, we're creating a connection string for a SQL Server database named "MyDatabase" running on the local machine. Note that the metadata parameter should be set to the location of your Entity Framework metadata files.

Step 2: Modify the DbContext Connection

The next step is to modify the connection used by your DbContext instance. You can do this by calling the Database.Connection.ConnectionString property and setting it to the new connection string.

<code>
using (var context = new MyDbContext())
{
    context.Database.Connection.ConnectionString = connectionString;
    // use the context
}
</code>

In this example, we're creating a new instance of our DbContext class and setting its connection string to the one we created in step 1.

Step 3: Dispose of Old DbContext Connection

Finally, it's important to dispose of the old DbContext connection to avoid resource leaks. You can do this by calling the Dispose method on the old connection.

<code>
using (var context = new MyDbContext())
{
    var oldConnection = context.Database.Connection;
    context.Database.Connection.ConnectionString = connectionString;
    oldConnection.Dispose();
    // use the context
}
</code>

By following these three steps, you can change the Entity Framework connection at runtime in your C# project. This can be useful in a variety of scenarios and allows for greater flexibility in your application.

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