如何使用实体框架获取数据库表的数量？

Question

I've seen posts about MetadataWorkspace but no examples for this task. I want my code to detect if the database has had a new table added so I'm comparing the number of tables in the DB with 2 lists of known tables. A table can be either user data or system data and I want to delete all the data in the user tables.

If a new table is discovered, the code will ask the user to define whether it contains system or user data.

Answer 1

This should help you . Here is the relevant part of it for you:

var metadata = ((IObjectContextAdapter)db).ObjectContext.MetadataWorkspace;

    var tables = metadata.GetItemCollection(DataSpace.SSpace)
      .GetItems<EntityContainer>()
      .Single()
      .BaseEntitySets
      .OfType<EntitySet>()
      .Where(s => !s.MetadataProperties.Contains("Type") 
        || s.MetadataProperties["Type"].ToString() == "Tables");