Method-Based Query Syntax Examples: Element Operators
The examples in this topic demonstrate how to use the First method to query the AdventureWorks Sales Model using method-based query syntax. The AdventureWorks Sales Model used in these examples is built from the Contact, Address, Product, SalesOrderHeader, and SalesOrderDetail tables in the AdventureWorks sample database.
The example in this topic uses the following using/Imports statements:
Option Explicit On
Option Strict On
Imports System.Data.Objects
Imports System.Globalization
using System;
using System.Data;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.Objects;
using System.Globalization;
using System.Data.EntityClient;
using System.Data.SqlClient;
using System.Data.Common;
First
Example
The following example uses the First method to find the first e-mail address that starts with 'caroline'.
Dim name = "caroline"
Using context As New AdventureWorksEntities
Dim contacts As ObjectSet(Of Contact) = context.Contacts
Dim query = contacts.First(Function(cont) _
cont.EmailAddress.StartsWith(name))
Console.WriteLine("An email address starting with 'caroline': {0}", _
query.EmailAddress)
End Using
string name = "caroline";
using (AdventureWorksEntities context = new AdventureWorksEntities())
{
ObjectSet<Contact> contacts = context.Contacts;
Contact query = contacts.First(contact =>
contact.EmailAddress.StartsWith(name));
Console.WriteLine("An email address starting with 'caroline': {0}",
query.EmailAddress);
}