E

EDM (Entity Data Model), 15, 163, 204–207

Element method, 183

element operators, 109–113

ElementAt operator, 112

ElementAtOrDefault operator, 112

Elements method, 183–184

elements, LINQ to XML queries, 183–186

ElementsAfterSelf method (XNode), 186

ElementsBeforeSelf method (XNode), 186

Empty operator, 104

EncodeName method (XmlConvert), 172

EncodeNmToken method (XmlConvert), 172

entities.

See also LINQ to Entities

associations between, 132–139

creating databases from, 157–158

creating from databases, 158

data querying and, 149–150

defined, 163

LINQ to SQL, 124–126

manipulating, 214–216

querying, 207–213

entity classes, 127–129, 153

entity constraints, 132

Entity Data Model (EDM), 15, 163, 204–207

entity inheritance, 129–131

entity relationships

data updates and, 153

join clause, 4

LINQ to Entities, 163

navigating, 6–8

entity updates, 152–154

EntityRef wrapper class, 133–134, 139

EntitySet wrapper class

associations between entities, 139

graph consistency, 138

grouping entities, 163

LINQ to Entities, 164

overview, 134–138

Enumerable class

extension methods, 74

overview, 25

query operators, 73

Select method, 73

Where method, 73

enumeration

C# support, 25–28

foreach statement, 27, 125

generics support, 27

LINQ to Objects, 28

MidpointRounding, 159

MoveNext method, 25, 27

object types, 27

System.Collections namespace, 25

equality operator, 114

EqualityComparer class, 85

Equals method, 92–93, 114

equals sign (=), 57

Except operator, 92–94

Exchange, 17

ExecuteMethodCall method (DataContext), 143

ExecuteQuery method (DataContext), 150

Explicit operator, 171–172

explicit relationships, 6

expression trees

deferred execution method, 126

defined, 125

lambda expressions, 31, 35–36

LINQ to SQL, 116

projections, 141

query expressions and, 73

expressions

object initialization, 57

XML literals, 63–64

Extensible Markup Language. See XML (Extensible Markup Language)

Extensible Stylesheet Language for Transformations (XSLT), 167, 184

Extension attribute, 55

extension methods

C# support, 36–42

data domains, 4, 15

deferred query evaluation, 188–189

defined, 4

Enumerable class, 74

example, 37

extending classes, 4

instance methods over, 40

LINQ to XML support, 168

overloading, 39

resolving, 39, 41

static classes and, 37

type considerations, 38

Visual Basic support, 54–56

XPath and, 187–188

extension methods resolution, 116–117

ExtensionMethods class, 55

Extensions class, 192, 194

external mapping, 158–159