Still celebrating National IT Professionals Day with 3 months of free Premium Membership. Use Code ITDAY17

x
?
Solved

Using EF and included tables

Posted on 2013-05-31
3
Medium Priority
?
243 Views
Last Modified: 2013-06-08
Experts,
Ok, so here is the scenario:
Assume that EF is initialized and has a good context to retrieve data from a database.  The database contains Tables called ObjectA and ObjectB and has data in them.

Check out the following code snippet:
Class ObjectA
{
	int ID;
	string Name;
	IEnumerable<ObjectB> objectB;
}

class ObjectB
{
	int ID;
	string Name;
	bool IsDeleted;
}

public IEnumerable<ObjectA> GetAllObjects(bool includeDeletedObjectB = false)
{
	var myobjects = GetAll()
		       .Include("ObjectB");
	if(!includeDeletedObjectB)
	{
                foreach(var item in myobjects)
                {
                    item.ObjectB.Where(y => y.IsDeleted == false);
                }
	}
	return myobjects;
}

Open in new window


Question:  Is there a way to pass in a parameter into the GetAllObjects, and somewhere in the var myobjects query, test the boolean includeDeletedObjectB and if true, include all sub ObjectBs (IsDeleted is true or false), but if false, only include those ObjectB whose IsDeleted flag is false.

Your assistance is greatly appreciated!
0
Comment
Question by:ericlockshine
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
3 Comments
 
LVL 64

Accepted Solution

by:
Fernando Soto earned 2000 total points
ID: 39212264
Hi ericlockshine;

This code snippet will do what you need

public IEnumerable<ObjectA> GetAllObjects(bool includeDeletedObjectB = false)
{
    // Set up the base query but don't execute it yet.
    var myObjects = from oA in DataContextInstance.ObjectA.Include("ObjectB")
                    select oA;
    
    // add the correct where clause to the above query
    if( includeDeletedObjectB )
        myObjects = myObjects.Where( oB => oB.IsDeleted == false || oB.IsDeleted == true );
    else
        myObjects = myObjects.Where( oB.IsDeleted == false );
    
    // Execute the query and return it to the caller    
    return myObjects.ToList();                    
}

Open in new window

0
 

Assisted Solution

by:ericlockshine
ericlockshine earned 0 total points
ID: 39216122
One change, and its in the else:
    if( includeDeletedObjectB )
        myObjects = myObjects.Where( oB => oB.IsDeleted == false || oB.IsDeleted == true );
    else
        myObjects = myObjects.Where( oB => oB.IsDeleted == false );

Open in new window


This works great.  Thanks for the assist.
0
 

Author Closing Comment

by:ericlockshine
ID: 39231315
Just the one bug, but thanks for the code.
0

Featured Post

Setting up LaraDock for Laravel

Learn how to set up LaraDock in a Laravel project - LaraDock gives us an easy way to run a Laravel application using Docker in a single command.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

In my previous two articles we discussed Binary Serialization (http://www.experts-exchange.com/A_4362.html) and XML Serialization (http://www.experts-exchange.com/A_4425.html). In this article we will try to know more about SOAP (Simple Object Acces…
A long time ago (May 2011), I have written an article showing you how to create a DLL using Visual Studio 2005 to be hosted in SQL Server 2005. That was valid at that time and it is still valid if you are still using these versions. You can still re…
This course is ideal for IT System Administrators working with VMware vSphere and its associated products in their company infrastructure. This course teaches you how to install and maintain this virtualization technology to store data, prevent vuln…
How to fix incompatible JVM issue while installing Eclipse While installing Eclipse in windows, got one error like above and unable to proceed with the installation. This video describes how to successfully install Eclipse. How to solve incompa…

704 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question