Changing schema name on runtime - Entity Framework

Question

I need to change the storage schema of the entities on runtime. I\'ve followed a wonderful post, available here: http://blogs.microsoft.co.il/blogs/idof/archive/2008/08/22/c

Answer 1

I had a lot of problems getting this to work when using EF6 with an OData Data Service, so I had to find an alternate solution. In my case, I didn't really need to do it on the fly. I could get away with changing the schema when deploying to some test environments, and in the installer.

Use Mono.Cecil to rewrite the embedded .ssdl resources straight in the DLLs. This works just fine in my case.

Here is a simplified example of how you can do this:

var filename = "/path/to/some.dll"
var replacement = "Schema=\"new_schema\"";

var module = ModuleDefinition.ReadModule(filename);
var ssdlResources = module.Resources.Where(x => x.Name.EndsWith(".ssdl"));

foreach (var resource in ssdlResources)
{
    var item = (EmbeddedResource)resource;
    string rewritten;

    using (var reader = new StreamReader(item.GetResourceStream()))
    {
        var text = reader.ReadToEnd();
        rewritten = Regex.Replace(text, "Schema=\"old_schema\"", replacement);
    }

    var bytes = Encoding.UTF8.GetBytes(rewritten);
    var newResource = new EmbeddedResource(item.Name, item.Attributes, bytes);

    module.Resources.Remove(item);
    module.Resources.Add(newResource);
}