在 EF Core model 构建器中获取实体 class 的命名空间

Question

I'm trying to establish a table naming convention such that the table name is a combination of the namespace and class. For example

namespace Sales;

public class Order { }

would translate to a table name of Sales_Order .

I've worked it out for the individual class

builder.ToTable($"{typeof(Order).Namespace}_{typeof(Order).Name}");

I'd like to set this as a default for all tables, if a ToTable was not explicitly set.

protected override void OnModelCreating(ModelBuilder builder)
{
    foreach(var entityType in builder.Model.GetEntityTypes())
    {
        if(entityType.ClrType == null) { continue; }
        {
            string tableName = entityType.GetTableName();
            string tableNamespace = entityType.GetType().Namespace;
            entityType.SetTableName($"{tableNamespace}_{tableName}");
        }
    }
}

but I can't get the namespace of the entity class. It is instead returning Microsoft.EntityFrameworkCore.Metadata.Internal

My entities will be in multiple different class libraries so I'm hoping to intercept and change the name in the model builder.

Any suggestions on how to determine the namespace of the entity from within modelbuilder?

Answer 1

entityType.GetType() is GetType method inherited from object so it will return underlying type for IMutableEntityType (collection of which is returned by builder.Model.GetEntityTypes() ), use entityType.ClrType :

string tableNamespace = entityType.ClrType.Namespace;

Answer 2

Here is the final solution.

protected override void OnModelCreating(ModelBuilder builder)
{
    foreach(var entityType in builder.Model.GetEntityTypes())
    {
        if (entityType.ClrType == null) { continue; }

        string entityName = entityType.Name.Split(".").Last();
        string tableName = entityType.GetTableName();

        if (tableName == entityName)
        {
            entityType.SetTableName($"{entityType.Name.Replace(".", "_")}");
        }

}

If the entity name matches the table name, the convention is applied. If an explicit ToTable was used to apply a different name, the convention is skipped.