... into the entity classes at key
points in time.
Finally, query expressions provide that warm fuzzy feeling when first seeing a LINQ query that
makes you want to get on board with LINQ. Nothing ... name);
}
Listing 2- 18 is the equivalent query using the query expression syntax:
Rattz_789-3C 02. fm Page 37 Tuesday, October 16, 20 07 2: 19 PM
44
CHAPTER 2
■ C# 3.0 LANGUAG...
... mapping file to perform
a LINQ to SQL query without using any attributes.
Listing 16-9. The Third DataContext Constructor Prototype Connecting to a Database and Using a
Mapping File
string ... Source=.\SQLEXPRESS;Initial Catalog=Northwind ;Integrated Security=SSPI;",
nwindMap);
IQueryable<Linqdev.Customer> query =
from cust in db.GetTable<Linqdev.Customer>()
wh...
... Service-Oriented
Architecture, 3e
Beginning ASP.NET 3.5
Data Access, 2e
Beginning
C# 20 08 Databases
Beginning C# 20 08
Pro LINQ: Language
Integrated Query
in C# 20 08
www .apress. com
SOURCE CODE ONLINE
Companion eBook
... ROADMAP
Silverlight and .NET 3.5
Recipes in C# 20 08
Pro C# 20 08 and the
.NET 3.5 Platform
Pro WPF in C# 20 08, 2e
Illust...
... example:
2
2
2
2
2
2
2
2
2
2
Rattz_789-3.book Page 129 Tuesday, October 16, 20 07 2: 21 PM
1 52
CHAPTER 5
■ NONDEFERRED OPERATORS
Exceptions
ArgumentNullException is thrown if any arguments are null.
InvalidOperationException ... example.
Reprinted Here for Convenience Is Listing 1-3
using System;
using System .Linq;
using System.Data .Linq;
using nwind;
Northwind db = new Nor...
... understanding of LINQ to Objects and just what LINQ can
do for you, it’s time to learn about using LINQ to query and generate XML. This functionality is called
LINQ to XML and, not so coincidentally, ... element at index 3 is retrieved. Now I will try a query with an invalid index
using the code in Listing 5-36.
Listing 5-36. Calling the ElementAtOrDefault Operator with an Inv...
... Tuesday, October 23 , 20 07 4:37 PM
25 2
CHAPTER 7
■ THE LINQ TO XML API
XProcessingInstruction.Target on XProcessingInstruction Objects and
XProcessingInstruction.Data on XProcessingInstruction Objects
To ... value of a processing instruction, simply modify the Target and Data properties of the
XProcessingInstruction object. Listing 7- 72 is an example.
Listing 7- 72. Updating a Pro...
... Mary Doe 10 02 Motorcycle $1 ,20 0.00
1999-01 -25 Dee Linquent 1007 Racing Bicycle $175.00
1999- 02- 08 Jack Sprat 1007 Racing Bicycle $20 0.00
1999- 02- 12 Roger Smith 1007 Racing Bicycle $22 5.00
OK, come ... $55.00
1999- 02- 14 Tom Jones 10 02 Motorcycle $400.00
1999- 02- 16 Mary Doe 10 02 Motorcycle $600.00
1999- 02- 17 Dee Linquent 10 02 Motorcycle $800.00
1999- 02- 25 Roger Smith 1...
... do?
The LINQ to DataSet operators allow a developer to perform LINQ queries on a DataSet, and
since a DataSet can be obtained using normal ADO.NET SQL queries, LINQ to DataSet allows LINQ
queries ... 329 Tuesday, October 16, 20 07 2: 21 PM
CHAPTER 10 ■ LINQ TO DATASET OPERATORS
347
dataRow.Field<int>(0),
dataRow.Field<string>(1));
}
except = seq1.Except(seq2);
Cons...
... with this option.
In Visual Studio 20 08 Beta 2, the valid choices are
Sql2000Provider, Sql2005Provider, and SqlProvider. All of
these provider classes are in the System.Data .Linq. SqlClient
namespace ... SQL, thrown in to boot.
■Tip LINQ to SQL is an entry-level ORM tool that permits powerful SQL queries.
In addition to providing LINQ query capabilities, as long as your...
... the appropriate
Table<T>. Listing 14 -22 contains an example of removing the relationship.
Listing 14 -22 . Removing a Relationship Between Two Entity Objects
Northwind db = new Northwind(@"Data ... to the query for the respective column. Listing 14-16 contains an example programmati-
cally building a query for such an interface.
Listing 14-16. Programmatically Building a Que...