I am writing an application where I need to abstract the DbSet table name. Instead of calling _db.Activities.ToList() (where Activity is a table in Sql) the code below will work for any variable table input.
Now I wanted to use .Where(),.OrderBy(),.FromSqlRaw() and other methods on top of the existing code.
How can I write _db.Activities.FromSqlRaw(...) for example, with a variable table name, just like it is doing for the GetAll method.
This is my DbSet for Activity
public virtual DbSet<Activity> Activities { get; set; } = null!;
This is the method to get all records from a variable table
public dynamic GetAll(string Table)
{
var curEntityPI = _db.GetType().GetProperty(Table);
var curEntityType = curEntityPI.PropertyType.GetGenericArguments().First();
// Getting Set<T> method
var method = _db.GetType().GetMember("Set").Cast<MethodInfo>().Where(x => x.IsGenericMethodDefinition).FirstOrDefault();
// Making Set<SomeRealCrmObject>() method
var genericMethod = method.MakeGenericMethod(curEntityType);
// invoking Setmethod into invokeSet
dynamic invokeSet = genericMethod.Invoke(_db, null);
// invoking ToList method from Set<> invokeSet
return Enumerable.ToList(invokeSet);
}
The general idea comes from this post
Define return type of method as List< dynamic> instead of dynamic
public List<dynamic> GetAll(string Table)
{
//your code...
return Enumerable.ToList(invokeSet);
}
Activity Class:
public class Activity
{
public int Field1 { get; set; }
public string Field2 { get; set; }
}
So, you can use all methods of List type
var activityList = GetAll("Activities");
var filteredList = activities.Where(x => x.Field1 > 1);
var orderedList = filteredList.OrderBy(x => x.Field2);
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