Hi Experts,
i'm a newbie on CSLA.Net Framework.
Currently i'm working on a project using CSLA.Net Framework, and for data access i'm using LinQ to SQL.
for example i have a Business List for Student. (CourseList)
my question is :
1. From this object, how do i add several parameters?
2. Multiple set of criteria e.g. search by FirstName and DOB / Just search by ID
cause when i'm adding 2 parameters on DataPortal.Fetch (Factory Method) it showed error
"No Overload for method 'Fetch' takes '2' arguments"
So do i need to create a complex criteria if i'd like to filter several parameters in this BusinessList ?
can somebody provide me the code....?
Thx
1. You should create a complex object that inherits from CriteriaBase and use managed properties. Example
[Serializable]
public class CreateCriteria : CriteriaBase
{
public static readonly PropertyInfo<Guid> ProjectIdProperty = RegisterProperty<CreateCriteria, Guid>(p => p.ProjectId);
public Guid ProjectId
{
get { return ReadProperty(ProjectIdProperty); }
set { LoadProperty(ProjectIdProperty, value); }
}
public static readonly PropertyInfo<int> RoleProperty = RegisterProperty<CreateCriteria, int>(p => p.Role);
public int Role
{
get { return ReadProperty(RoleProperty); }
set { LoadProperty(RoleProperty, value); }
}
}
2. Multiple sets of criterias can be cumbersome. Out-of-the-box - you will have to create separate sets of LINQ queries. Or download and use LinqKit from Joe and Ben albahari, http://www.albahari.com/nutshell/linqkit.aspx , and use the PredicateBuilder to build dynamic where statements in LINQ.
Hi JonnyBee,
thanks for your quick reply...
do mean that i have to use combining expressions on LINQKit, by calling invoke and expand methods?
or maybe i rather should ask that what is your best recommended for my problem?
Hi,
1. In order to send multiple parameters to the fetch method you should create a CriteriaObject.
2. LINQKit's PredicateBuilder will help you create dynamic where statements in your data access. Read this article:
http://www.albahari.com/nutshell/predicatebuilder.aspx
I'd also recommend LinqPad for testing your queries. You can add a reference to your EF or L2S objects assembly - add LinqKit (or other assemblies) and write dynamic queries on your own data access assembly. You can also watch the video tutorials here: http://oreilly.com/pub/e/1295
Hi JonnyBee..
thx for your reply... its a wonderful source for me 
thx a lot.. i've tried and it works... thumb up for you 
once again thanks...,
Stone
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