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HomeHomeDevelopment and...Development and...DNN Platform (o...DNN Platform (o...two Linq to Sql bugstwo Linq to Sql bugs
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7/22/2008 12:55 AM
 
Saeed Ali hosseini


www.saeedalhs.net
Joined: 6/10/2007
Posts: 31

Creating a new dotnetnuke module using LinqToSql based on LinqThings4Sale example, I created a table named Emplyees (from Northwind database) and then use this table in a Linq to SQL Class (IDE: Visual Web Developer 2008 Express Edition), I faced with 2 problems below:

  1. Singularization Problem: The wizard automatically converts table's Plural name to Singular noun --> Employees converted to Employee  --> There will arise some errors like " Bad type casting", "Unable to convert data types", ...
    • Solution: Rename the table class by hand to correspond it with it's database defined table name.
  2. Self Returning Association: Employees table has field " ReportsTo" which refers to EmployeeID in the same table, compiling the web site results error: Error 1 'Employees': member names cannot be the same as their enclosing type E:\Visual Studio 2008 Express\Websites\LinqWebSite\App_Code\ActivitiesManagementSystem\ActivitiesManagementSystem.designer.cs 623 32 http://...
    • Soultion: Just remove the self-association relation.

 

سعید علی حسینی

w w w . a l i h o s s e i n i . n e t

 
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7/22/2008 7:50 AM
 
Michael Washington


Michael Washington's Avatar

www.LightSwitchHelpWebsite.com
Joined: 7/17/2004
Posts: 3526

Saeed Alhs wrote

  1. Singularization Problem: The wizard automatically converts table's Plural name to Singular noun --> Employees converted to Employee  --> There will arise some errors like " Bad type casting", "Unable to convert data types", ...
    • Solution: Rename the table class by hand to correspond it with it's database defined table name.
  2. Self Returning Association: Employees table has field " ReportsTo" which refers to EmployeeID in the same table, compiling the web site results error: Error 1 'Employees': member names cannot be the same as their enclosing type E:\Visual Studio 2008 Express\Websites\LinqWebSite\App_Code\ActivitiesManagementSystem\ActivitiesManagementSystem.designer.cs 623 32 http://...
    • Soultion: Just remove the self-association relation. 

1. The singularization is not the problem, it does that with all tables that end in an "s". It must conflict with another class named Employee somewhere. What was the exact conflict?

2. If you do need self association use Linq to Entities. This is still in Beta at the moment.


Michael Washington
http://ADefWebserver.com
www.ADefHelpDesk.com
A Free Open Source DotNetNuke Help Desk Module
 
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