DbSet table name

Extension methods for DbContext and ObjectContext:

public static class ContextExtensions
{
    public static string GetTableName<T>(this DbContext context) where T : class
    {
        ObjectContext objectContext = ((IObjectContextAdapter) context).ObjectContext;

        return objectContext.GetTableName<T>();
    }

    public static string GetTableName<T>(this ObjectContext context) where T : class
    {
        string sql = context.CreateObjectSet<T>().ToTraceString();
        Regex regex = new Regex("FROM (?<table>.*) AS");
        Match match = regex.Match(sql);

        string table = match.Groups["table"].Value;
        return table;
    }
}

Using a ObjectContext object:

ObjectContext context = ....;
string table = context.GetTableName<Foo>();

Using a DbContext object:

DbContext context = ....;
string table = context.GetTableName<Foo>();

More info here:

Entity Framework: Get mapped table name from an entity

You can apply extension method to get Table name from your entity class
In this case, You wont need DbContext to get table name , it gets it inside extension method

public static string GetTableName<T>(this T entity) where T : class
{
    var object_context = GetObjectContext(entity);

    if (object_context == null || object_context.TransactionHandler == null)
        return null;

     var dbcontext=object_context.TransactionHandler.DbContext;
    var query= dbcontext.Set(entity.GetType()).ToString();
    var reg = new Regex(@"FROM \[dbo\]\.\[(?<table>.*)\] AS");
    var match = reg.Match(query);

    var tableName= match.Groups["table"].Value;
    return tableName;
}

private static ObjectContext GetObjectContext(object entity)
{
    var field = entity.GetType().GetField("_entityWrapper");

    if (field == null)
        return null;

    var val= field.GetValue(entity);
    var property = val.GetType().GetProperty("Context");
    var context = (ObjectContext)property.GetValue(val, null);

    return context;
}

This is where we reach to DbContext:

var object_context = GetObjectContext(entity)

Usage:

var tableName = entity.GetTableName();