AI导航网
微信公众号搜"智元新知"关注
微信扫一扫可直接关注哦！

使用Entity Framework和WCF Ria Services开发SilverLight之1：简单模型

分类：Silverlight作者：编程之家

本文目的是通过Silverlight ria service完成一次数据的读取过程，并且在此基础上建立测试项目。

Ria service借助于WCF和ADO.NET Entity Framework构建分布式开发框架。使用它可以快速构建自己的开发模式。

1：基础结构

首先，创建SL APP，如下：

image

然后，选择创建web：

image

可以，也可以不勾选enable wcf ria service，如果勾选了，在SL APP中会多几个DLL的引用，其它没有任何差别。如图：

image

2：创建一个示例数据库

这是一个小而轻型的数据库，在mdsN的课程中有使用到它。如下：

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO

USE [master];
GO

IF EXISTS (SELECT * FROM sys.databases WHERE name = 'School')
	DROP DATABASE School;
GO

-- Create the School database.
CREATE DATABASE School;
GO

-- Specify a simple recovery model 
-- to keep the log growth to a minimum.
ALTER DATABASE School 
	SET RECOVERY SIMPLE;
GO

USE School;
GO

-- Create the Department table.
IF NOT EXISTS (SELECT * FROM sys.objects 
		WHERE object_id = OBJECT_ID(N'[dbo].[Department]') 
		AND type in (N'U'))
BEGIN
CREATE TABLE [dbo].[Department](
	[DepartmentID] [int] NOT NULL,[Name] [nvarchar](50) NOT NULL,[Budget] [money] NOT NULL,[StartDate] [datetime] NOT NULL,[Administrator] [int] NULL,CONSTRAINT [PK_Department] PRIMARY KEY CLUSTERED 
(
	[DepartmentID] ASC
)WITH (IGnorE_DUP_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]
END
GO

-- Create the Person table.
IF NOT EXISTS (SELECT * FROM sys.objects 
		WHERE object_id = OBJECT_ID(N'[dbo].[Person]') 
		AND type in (N'U'))
BEGIN
CREATE TABLE [dbo].[Person](
	[PersonID] [int] IDENTITY(1,1) NOT NULL,[LastName] [nvarchar](50) NOT NULL,[FirstName] [nvarchar](50) NOT NULL,[HireDate] [datetime] NULL,[EnrollmentDate] [datetime] NULL,CONSTRAINT [PK_School.Student] PRIMARY KEY CLUSTERED 
(
	[PersonID] ASC
)WITH (IGnorE_DUP_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]
END
GO

-- Create the OnsiteCourse table.
IF NOT EXISTS (SELECT * FROM sys.objects 
		WHERE object_id = OBJECT_ID(N'[dbo].[OnsiteCourse]') 
		AND type in (N'U'))
BEGIN
CREATE TABLE [dbo].[OnsiteCourse](
	[CourseID] [int] NOT NULL,[Location] [nvarchar](50) NOT NULL,[Days] [nvarchar](50) NOT NULL,[Time] [smalldatetime] NOT NULL,CONSTRAINT [PK_OnsiteCourse] PRIMARY KEY CLUSTERED 
(
	[CourseID] ASC
)WITH (IGnorE_DUP_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]
END
GO

-- Create the OnlineCourse table.
IF NOT EXISTS (SELECT * FROM sys.objects 
		WHERE object_id = OBJECT_ID(N'[dbo].[OnlineCourse]') 
		AND type in (N'U'))
BEGIN
CREATE TABLE [dbo].[OnlineCourse](
	[CourseID] [int] NOT NULL,[URL] [nvarchar](100) NOT NULL,CONSTRAINT [PK_OnlineCourse] PRIMARY KEY CLUSTERED 
(
	[CourseID] ASC
)WITH (IGnorE_DUP_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]
END
GO

--Create the StudentGrade table.
IF NOT EXISTS (SELECT * FROM sys.objects 
		WHERE object_id = OBJECT_ID(N'[dbo].[StudentGrade]') 
		AND type in (N'U'))
BEGIN
CREATE TABLE [dbo].[StudentGrade](
	[EnrollmentID] [int] IDENTITY(1,[CourseID] [int] NOT NULL,[StudentID] [int] NOT NULL,[Grade] [decimal](3,2) NULL,CONSTRAINT [PK_StudentGrade] PRIMARY KEY CLUSTERED 
(
	[EnrollmentID] ASC
)WITH (IGnorE_DUP_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]
END
GO

-- Create the CourseInstructor table.
IF NOT EXISTS (SELECT * FROM sys.objects 
		WHERE object_id = OBJECT_ID(N'[dbo].[CourseInstructor]') 
		AND type in (N'U'))
BEGIN
CREATE TABLE [dbo].[CourseInstructor](
	[CourseID] [int] NOT NULL,[PersonID] [int] NOT NULL,CONSTRAINT [PK_CourseInstructor] PRIMARY KEY CLUSTERED 
(
	[CourseID] ASC,[PersonID] ASC
)WITH (IGnorE_DUP_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]
END
GO

-- Create the Course table.
IF NOT EXISTS (SELECT * FROM sys.objects 
		WHERE object_id = OBJECT_ID(N'[dbo].[Course]') 
		AND type in (N'U'))
BEGIN
CREATE TABLE [dbo].[Course](
	[CourseID] [int] NOT NULL,[Title] [nvarchar](100) NOT NULL,[Credits] [int] NOT NULL,[DepartmentID] [int] NOT NULL,CONSTRAINT [PK_School.Course] PRIMARY KEY CLUSTERED 
(
	[CourseID] ASC
)WITH (IGnorE_DUP_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]
END
GO

-- Create the OfficeAssignment table.
IF NOT EXISTS (SELECT * FROM sys.objects 
		WHERE object_id = OBJECT_ID(N'[dbo].[OfficeAssignment]')
		AND type in (N'U'))
BEGIN
CREATE TABLE [dbo].[OfficeAssignment](
	[InstructorID] [int] NOT NULL,[Timestamp] [timestamp] NOT NULL,CONSTRAINT [PK_OfficeAssignment] PRIMARY KEY CLUSTERED 
(
	[InstructorID] ASC
)WITH (IGnorE_DUP_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]
END
GO

-- Define the relationship between OnsiteCourse and Course.
IF NOT EXISTS (SELECT * FROM sys.foreign_keys 
       WHERE object_id = OBJECT_ID(N'[dbo].[FK_OnsiteCourse_Course]')
       AND parent_object_id = OBJECT_ID(N'[dbo].[OnsiteCourse]'))
ALTER TABLE [dbo].[OnsiteCourse]  WITH CHECK ADD  
       CONSTRAINT [FK_OnsiteCourse_Course] FOREIGN KEY([CourseID])
REFERENCES [dbo].[Course] ([CourseID])
GO
ALTER TABLE [dbo].[OnsiteCourse] CHECK 
       CONSTRAINT [FK_OnsiteCourse_Course]
GO

-- Define the relationship between OnlineCourse and Course.
IF NOT EXISTS (SELECT * FROM sys.foreign_keys 
       WHERE object_id = OBJECT_ID(N'[dbo].[FK_OnlineCourse_Course]')
       AND parent_object_id = OBJECT_ID(N'[dbo].[OnlineCourse]'))
ALTER TABLE [dbo].[OnlineCourse]  WITH CHECK ADD  
       CONSTRAINT [FK_OnlineCourse_Course] FOREIGN KEY([CourseID])
REFERENCES [dbo].[Course] ([CourseID])
GO
ALTER TABLE [dbo].[OnlineCourse] CHECK 
       CONSTRAINT [FK_OnlineCourse_Course]
GO

-- Define the relationship between StudentGrade and Course.
IF NOT EXISTS (SELECT * FROM sys.foreign_keys 
       WHERE object_id = OBJECT_ID(N'[dbo].[FK_StudentGrade_Course]')
       AND parent_object_id = OBJECT_ID(N'[dbo].[StudentGrade]'))
ALTER TABLE [dbo].[StudentGrade]  WITH CHECK ADD  
       CONSTRAINT [FK_StudentGrade_Course] FOREIGN KEY([CourseID])
REFERENCES [dbo].[Course] ([CourseID])
GO
ALTER TABLE [dbo].[StudentGrade] CHECK 
       CONSTRAINT [FK_StudentGrade_Course]
GO

--Define the relationship between StudentGrade and Student.
IF NOT EXISTS (SELECT * FROM sys.foreign_keys 
       WHERE object_id = OBJECT_ID(N'[dbo].[FK_StudentGrade_Student]')
       AND parent_object_id = OBJECT_ID(N'[dbo].[StudentGrade]'))
ALTER TABLE [dbo].[StudentGrade]  WITH CHECK ADD  
       CONSTRAINT [FK_StudentGrade_Student] FOREIGN KEY([StudentID])
REFERENCES [dbo].[Person] ([PersonID])
GO
ALTER TABLE [dbo].[StudentGrade] CHECK 
       CONSTRAINT [FK_StudentGrade_Student]
GO

-- Define the relationship between CourseInstructor and Course.
IF NOT EXISTS (SELECT * FROM sys.foreign_keys 
   WHERE object_id = OBJECT_ID(N'[dbo].[FK_CourseInstructor_Course]')
   AND parent_object_id = OBJECT_ID(N'[dbo].[CourseInstructor]'))
ALTER TABLE [dbo].[CourseInstructor]  WITH CHECK ADD  
   CONSTRAINT [FK_CourseInstructor_Course] FOREIGN KEY([CourseID])
REFERENCES [dbo].[Course] ([CourseID])
GO
ALTER TABLE [dbo].[CourseInstructor] CHECK 
   CONSTRAINT [FK_CourseInstructor_Course]
GO

-- Define the relationship between CourseInstructor and Person.
IF NOT EXISTS (SELECT * FROM sys.foreign_keys 
   WHERE object_id = OBJECT_ID(N'[dbo].[FK_CourseInstructor_Person]')
   AND parent_object_id = OBJECT_ID(N'[dbo].[CourseInstructor]'))
ALTER TABLE [dbo].[CourseInstructor]  WITH CHECK ADD  
   CONSTRAINT [FK_CourseInstructor_Person] FOREIGN KEY([PersonID])
REFERENCES [dbo].[Person] ([PersonID])
GO
ALTER TABLE [dbo].[CourseInstructor] CHECK 
   CONSTRAINT [FK_CourseInstructor_Person]
GO

-- Define the relationship between Course and Department.
IF NOT EXISTS (SELECT * FROM sys.foreign_keys 
       WHERE object_id = OBJECT_ID(N'[dbo].[FK_Course_Department]')
       AND parent_object_id = OBJECT_ID(N'[dbo].[Course]'))
ALTER TABLE [dbo].[Course]  WITH CHECK ADD  
       CONSTRAINT [FK_Course_Department] FOREIGN KEY([DepartmentID])
REFERENCES [dbo].[Department] ([DepartmentID])
GO
ALTER TABLE [dbo].[Course] CHECK CONSTRAINT [FK_Course_Department]
GO

--Define the relationship between OfficeAssignment and Person.
IF NOT EXISTS (SELECT * FROM sys.foreign_keys 
   WHERE object_id = OBJECT_ID(N'[dbo].[FK_OfficeAssignment_Person]')
   AND parent_object_id = OBJECT_ID(N'[dbo].[OfficeAssignment]'))
ALTER TABLE [dbo].[OfficeAssignment]  WITH CHECK ADD  
   CONSTRAINT [FK_OfficeAssignment_Person] FOREIGN KEY([InstructorID])
REFERENCES [dbo].[Person] ([PersonID])
GO
ALTER TABLE [dbo].[OfficeAssignment] CHECK 
   CONSTRAINT [FK_OfficeAssignment_Person]
GO

-- Create InsertOfficeAssignment stored procedure.
IF NOT EXISTS (SELECT * FROM sys.objects 
		WHERE object_id = OBJECT_ID(N'[dbo].[InsertOfficeAssignment]') 
		AND type in (N'P',N'PC'))
BEGIN
EXEC dbo.sp_executesql @statement = N'
CREATE PROCEDURE [dbo].[InsertOfficeAssignment]
		@InstructorID int,@Location nvarchar(50)
		AS
		INSERT INTO dbo.OfficeAssignment (InstructorID,Location)
		VALUES (@InstructorID,@Location);
		IF @@ROWCOUNT > 0
		BEGIN
			SELECT [Timestamp] FROM OfficeAssignment 
				WHERE InstructorID=@InstructorID;
		END
' 
END
GO

--Create the UpdateOfficeAssignment stored procedure.
IF NOT EXISTS (SELECT * FROM sys.objects 
		WHERE object_id = OBJECT_ID(N'[dbo].[UpdateOfficeAssignment]') 
		AND type in (N'P',N'PC'))
BEGIN
EXEC dbo.sp_executesql @statement = N'
CREATE PROCEDURE [dbo].[UpdateOfficeAssignment]
		@InstructorID int,@Location nvarchar(50),@OrigTimestamp timestamp
		AS
		UPDATE OfficeAssignment SET Location=@Location 
		WHERE InstructorID=@InstructorID AND [Timestamp]=@OrigTimestamp;
		IF @@ROWCOUNT > 0
		BEGIN
			SELECT [Timestamp] FROM OfficeAssignment 
				WHERE InstructorID=@InstructorID;
		END
' 
END
GO

-- Create the DeleteOfficeAssignment stored procedure.
IF NOT EXISTS (SELECT * FROM sys.objects 
		WHERE object_id = OBJECT_ID(N'[dbo].[DeleteOfficeAssignment]') 
		AND type in (N'P',N'PC'))
BEGIN
EXEC dbo.sp_executesql @statement = N'
CREATE PROCEDURE [dbo].[DeleteOfficeAssignment]
		@InstructorID int
		AS
		DELETE FROM OfficeAssignment
		WHERE InstructorID=@InstructorID;
' 
END
GO

-- Create the DeletePerson stored procedure.
IF NOT EXISTS (SELECT * FROM sys.objects 
		WHERE object_id = OBJECT_ID(N'[dbo].[DeletePerson]') 
		AND type in (N'P',N'PC'))
BEGIN
EXEC dbo.sp_executesql @statement = N'
CREATE PROCEDURE [dbo].[DeletePerson]
		@PersonID int
		AS
		DELETE FROM Person WHERE PersonID = @PersonID;
' 
END
GO

-- Create the UpdatePerson stored procedure.
IF NOT EXISTS (SELECT * FROM sys.objects 
		WHERE object_id = OBJECT_ID(N'[dbo].[UpdatePerson]') 
		AND type in (N'P',N'PC'))
BEGIN
EXEC dbo.sp_executesql @statement = N'
CREATE PROCEDURE [dbo].[UpdatePerson]
		@PersonID int,@LastName nvarchar(50),@FirstName nvarchar(50),@HireDate datetime,@EnrollmentDate datetime
		AS
		UPDATE Person SET LastName=@LastName,FirstName=@FirstName,HireDate=@HireDate,EnrollmentDate=@EnrollmentDate
		WHERE PersonID=@PersonID;
' 
END
GO

-- Create the InsertPerson stored procedure.
IF NOT EXISTS (SELECT * FROM sys.objects 
		WHERE object_id = OBJECT_ID(N'[dbo].[InsertPerson]') 
		AND type in (N'P',N'PC'))
BEGIN
EXEC dbo.sp_executesql @statement = N'
CREATE PROCEDURE [dbo].[InsertPerson]
		@LastName nvarchar(50),@EnrollmentDate datetime
		AS
		INSERT INTO dbo.Person (LastName,FirstName,HireDate,EnrollmentDate)
		VALUES (@LastName,@FirstName,@HireDate,@EnrollmentDate);
		SELECT ScopE_IDENTITY() as NewPersonID;
' 
END
GO

-- Create GetStudentGrades stored procedure.
IF NOT EXISTS (SELECT * FROM sys.objects 
            WHERE object_id = OBJECT_ID(N'[dbo].[GetStudentGrades]') 
            AND type in (N'P',N'PC'))
BEGIN
EXEC dbo.sp_executesql @statement = N'
CREATE PROCEDURE [dbo].[GetStudentGrades]
            @StudentID int
            AS
            SELECT EnrollmentID,Grade,CourseID,StudentID FROM dbo.StudentGrade
            WHERE StudentID = @StudentID
' 
END
GO

-- Create GetDepartmentName stored procedure.
IF NOT EXISTS (SELECT * FROM sys.objects 
            WHERE object_id = OBJECT_ID(N'[dbo].[GetDepartmentName]') 
            AND type in (N'P',N'PC'))
BEGIN
EXEC dbo.sp_executesql @statement = N'
CREATE PROCEDURE [dbo].[GetDepartmentName]
      @ID int,@Name nvarchar(50) OUTPUT
      AS
      SELECT @Name = Name FROM Department
      WHERE DepartmentID = @ID
'
END
GO

-- Insert data into the Person table.
USE School
GO
SET IDENTITY_INSERT dbo.Person ON
GO
INSERT INTO dbo.Person (PersonID,LastName,EnrollmentDate)
VALUES (1,'Abercrombie','Kim','1995-03-11',null);
INSERT INTO dbo.Person (PersonID,EnrollmentDate)
VALUES (2,'Barzdukas','Gytis',null,'2005-09-01');
INSERT INTO dbo.Person (PersonID,EnrollmentDate)
VALUES (3,'Justice','Peggy','2001-09-01');
INSERT INTO dbo.Person (PersonID,EnrollmentDate)
VALUES (4,'Fakhouri','Fadi','2002-08-06',EnrollmentDate)
VALUES (5,'Harui','Roger','1998-07-01',EnrollmentDate)
VALUES (6,'Li','Yan','2002-09-01');
INSERT INTO dbo.Person (PersonID,EnrollmentDate)
VALUES (7,'norman','Laura','2003-09-01');
INSERT INTO dbo.Person (PersonID,EnrollmentDate)
VALUES (8,'Olivotto','Nino',EnrollmentDate)
VALUES (9,'Tang','Wayne',EnrollmentDate)
VALUES (10,'Alonso','Meredith',EnrollmentDate)
VALUES (11,'Lopez','Sophia','2004-09-01');
INSERT INTO dbo.Person (PersonID,EnrollmentDate)
VALUES (12,'browning','2000-09-01');
INSERT INTO dbo.Person (PersonID,EnrollmentDate)
VALUES (13,'Anand','Arturo',EnrollmentDate)
VALUES (14,'Walker','Alexandra',EnrollmentDate)
VALUES (15,'Powell','Carson',EnrollmentDate)
VALUES (16,'Jai','damien',EnrollmentDate)
VALUES (17,'Carlson','Robyn',EnrollmentDate)
VALUES (18,'Zheng','2004-02-12',EnrollmentDate)
VALUES (19,'Bryant',EnrollmentDate)
VALUES (20,'Suarez',EnrollmentDate)
VALUES (21,'Holt',EnrollmentDate)
VALUES (22,'Alexander',EnrollmentDate)
VALUES (23,'Morgan','Isaiah',EnrollmentDate)
VALUES (24,'Martin','Randall',EnrollmentDate)
VALUES (25,'Kapoor','Candace','2001-01-15',EnrollmentDate)
VALUES (26,'Rogers','Cody',EnrollmentDate)
VALUES (27,'Serrano','Stacy','1999-06-01',EnrollmentDate)
VALUES (28,'White','Anthony',EnrollmentDate)
VALUES (29,'Griffin','Rachel',EnrollmentDate)
VALUES (30,'Shan','Alicia',EnrollmentDate)
VALUES (31,'Stewart','Jasmine','1997-10-12',EnrollmentDate)
VALUES (32,'Xu','Kristen','2001-7-23',EnrollmentDate)
VALUES (33,'Gao','Erica','2003-01-30');
INSERT INTO dbo.Person (PersonID,EnrollmentDate)
VALUES (34,'Van Houten','2000-12-07',null);
GO
SET IDENTITY_INSERT dbo.Person OFF
GO

-- Insert data into the Department table.
INSERT INTO dbo.Department (DepartmentID,[Name],Budget,StartDate,Administrator)
VALUES (1,'Engineering',350000.00,'2007-09-01',2);
INSERT INTO dbo.Department (DepartmentID,Administrator)
VALUES (2,'English',120000.00,6);
INSERT INTO dbo.Department (DepartmentID,Administrator)
VALUES (4,'Economics',200000.00,4);
INSERT INTO dbo.Department (DepartmentID,Administrator)
VALUES (7,'Mathematics',250000.00,3);
GO


-- Insert data into the Course table.
INSERT INTO dbo.Course (CourseID,Title,Credits,DepartmentID)
VALUES (1050,'Chemistry',4,1);
INSERT INTO dbo.Course (CourseID,DepartmentID)
VALUES (1061,'Physics',DepartmentID)
VALUES (1045,'Calculus',7);
INSERT INTO dbo.Course (CourseID,DepartmentID)
VALUES (2030,'Poetry',2,2);
INSERT INTO dbo.Course (CourseID,DepartmentID)
VALUES (2021,'Composition',3,DepartmentID)
VALUES (2042,'Literature',DepartmentID)
VALUES (4022,'Microeconomics',4);
INSERT INTO dbo.Course (CourseID,DepartmentID)
VALUES (4041,'Macroeconomics',DepartmentID)
VALUES (4061,'Quantitative',DepartmentID)
VALUES (3141,'Trigonometry',7);
GO

-- Insert data into the OnlineCourse table.
INSERT INTO dbo.OnlineCourse (CourseID,URL)
VALUES (2030,'http://www.fineartschool.net/Poetry');
INSERT INTO dbo.OnlineCourse (CourseID,URL)
VALUES (2021,'http://www.fineartschool.net/Composition');
INSERT INTO dbo.OnlineCourse (CourseID,URL)
VALUES (4041,'http://www.fineartschool.net/Macroeconomics');
INSERT INTO dbo.OnlineCourse (CourseID,URL)
VALUES (3141,'http://www.fineartschool.net/Trigonometry');

--Insert data into OnsiteCourse table.
INSERT INTO dbo.OnsiteCourse (CourseID,Location,Days,[Time])
VALUES (1050,'123 Smith','MTWH','11:30');
INSERT INTO dbo.OnsiteCourse (CourseID,[Time])
VALUES (1061,'234 Smith','TWHF','13:15');
INSERT INTO dbo.OnsiteCourse (CourseID,[Time])
VALUES (1045,'121 Smith','MWHF','15:30');
INSERT INTO dbo.OnsiteCourse (CourseID,[Time])
VALUES (4061,'22 Williams','TH','11:15');
INSERT INTO dbo.OnsiteCourse (CourseID,[Time])
VALUES (2042,'225 Adams','11:00');
INSERT INTO dbo.OnsiteCourse (CourseID,[Time])
VALUES (4022,'23 Williams','MWF','9:00');

-- Insert data into the CourseInstructor table.
INSERT INTO dbo.CourseInstructor(CourseID,PersonID)
VALUES (1050,1);
INSERT INTO dbo.CourseInstructor(CourseID,PersonID)
VALUES (1061,31);
INSERT INTO dbo.CourseInstructor(CourseID,PersonID)
VALUES (1045,5);
INSERT INTO dbo.CourseInstructor(CourseID,PersonID)
VALUES (2030,4);
INSERT INTO dbo.CourseInstructor(CourseID,PersonID)
VALUES (2021,27);
INSERT INTO dbo.CourseInstructor(CourseID,PersonID)
VALUES (2042,25);
INSERT INTO dbo.CourseInstructor(CourseID,PersonID)
VALUES (4022,18);
INSERT INTO dbo.CourseInstructor(CourseID,PersonID)
VALUES (4041,32);
INSERT INTO dbo.CourseInstructor(CourseID,PersonID)
VALUES (4061,34);
GO

--Insert data into the OfficeAssignment table.
INSERT INTO dbo.OfficeAssignment(InstructorID,Location)
VALUES (1,'17 Smith');
INSERT INTO dbo.OfficeAssignment(InstructorID,Location)
VALUES (4,'29 Adams');
INSERT INTO dbo.OfficeAssignment(InstructorID,Location)
VALUES (5,'37 Williams');
INSERT INTO dbo.OfficeAssignment(InstructorID,Location)
VALUES (18,'143 Smith');
INSERT INTO dbo.OfficeAssignment(InstructorID,Location)
VALUES (25,'57 Adams');
INSERT INTO dbo.OfficeAssignment(InstructorID,Location)
VALUES (27,'271 Williams');
INSERT INTO dbo.OfficeAssignment(InstructorID,Location)
VALUES (31,'131 Smith');
INSERT INTO dbo.OfficeAssignment(InstructorID,Location)
VALUES (32,'203 Williams');
INSERT INTO dbo.OfficeAssignment(InstructorID,Location)
VALUES (34,'213 Smith');

-- Insert data into the StudentGrade table.
INSERT INTO dbo.StudentGrade (CourseID,StudentID,Grade)
VALUES (2021,4);
INSERT INTO dbo.StudentGrade (CourseID,Grade)
VALUES (2030,3.5);
INSERT INTO dbo.StudentGrade (CourseID,3);
INSERT INTO dbo.StudentGrade (CourseID,6,2.5);
INSERT INTO dbo.StudentGrade (CourseID,Grade)
VALUES (2042,7,8,Grade)
VALUES (4041,9,10,null);
INSERT INTO dbo.StudentGrade (CourseID,11,12,Grade)
VALUES (4061,Grade)
VALUES (4022,14,13,15,16,2);
INSERT INTO dbo.StudentGrade (CourseID,17,19,20,21,22,23,Grade)
VALUES (1045,1.5);
INSERT INTO dbo.StudentGrade (CourseID,Grade)
VALUES (1061,24,25,Grade)
VALUES (1050,26,27,28,29,30,4);
GO

3：RIA之ADO.NET ENTITY DATA MODEL

为web创建ADO.NET ENTITY DATA MODEL，如图：

image

注意，习惯命名规则：Model数据库名.edmx。

在下一步中，我们选择刚才创建的数据库：

image

选择新建连接，按照指示完成数据库连接配置。

进入下一步：

image

在这一步中，注意一定要选择第一个红框中的内容，否则默认不能生成联表查询。在下一步中，我们选择“Generate from database”，如下：

image

点击Finish后，VS为我们生成了一个以edmx为后缀的文件。OK，到此暂停，我们先来看看这个edmx文件是干什么用的，为我们完成了什么工作。

3.1：什么是EDM

ENTITY DATA MODEL，简写为EDM，中文为实体数据模型。它由三个概念组成。概念模型由概念架构定义语言文件 (.csdl)来定义，映射由映射规范语言文件 (.msl)，存储模型（又称逻辑模型）由存储架构定义语言文件 (.ssdl)来定义。这三者合在一起就是EDM模型。EDM模型在项目中的表现形式就是扩展名为.edmx的文件。

Entity Framework实现了一套类似于ADO.NET2.0中的连接类来操作EDM完成持久化。EntityFramework中所有发往EDM的操作都是经过EntityClient，包括使用LINQ to Entity进行的操作。目前可用操作如下：

image

4：针对web EMD的测试

理解了EMD在开发中所处的作用，我们就可以针对EDM来写个测试项目。为了简便期间，我们直接在EMD中的SchoolEntities类型的构造方法中直接创建测试（严格意义来说，这不是个单元测试，这仅是测试）。

image

针对这个操作，会在测试项目中生成一个SchoolEntitiesTest的类型，同时，在这个类型中会生成一个SchoolEntitiesConstructorTest的方法，如下：

image

由于我们仅仅测试EDM，而跟WEB本身没有关系，所有我们注释掉了红框中的内容。同时我们写入真正的测试代码，如下：

image

这里的一个小细节是，连接字符串我们通过编码的方式传入到测试方法。EDM的连接字符串和ADO.NET的连接字符串有很大不同，在这里，可公开一下我们的生成EDM连接字符串的方法：

        public string GetConnectionString()
        {
            string providerName = "System.Data.sqlClient";
            string serverName = "192.168.0.96";
            string databaseName = "mysample";
            sqlConnectionStringBuilder sqlBuilder = new sqlConnectionStringBuilder();
            sqlBuilder.DataSource = serverName;
            sqlBuilder.InitialCatalog = databaseName;
            sqlBuilder.IntegratedSecurity = false;
            sqlBuilder.UserID = "sa";
            sqlBuilder.Password = "sasa";
            string providerString = sqlBuilder.ToString();
            EntityConnectionStringBuilder entityBuilder = new EntityConnectionStringBuilder();
            entityBuilder.Provider = providerName;
            entityBuilder.ProviderConnectionString = providerString;
            entityBuilder.Provider = providerName;
            entityBuilder.Metadata = "res://*/Modelmysample.csdl|res://*/Modelmysample.ssdl|res://*/Modelmysample.msl";
            return entityBuilder.ToString();
        }

调试我们的测试代码，最终我们会获取到数据库中的4条记录。

image

通过了以上的阐述，我们了解了EDM的作用，以及如何测试EDM。接下来，我们需要知道如何在SL APP中调用WEB中的EDM。

5：Domain Service Class

在SL APP中调用EDM是通过WEB的Domain Service Class来实现的。简单的说来，它是RIA SERVICE框架中的一个重要内容。

在WEB选择添加新项，选择Domain Service Class，命名，下一步会出现如下界面：

image

我们可以做出如上勾选。确定后，编译整个解决方法，会发现目前的解决方案结构会变成如下形式：

image

注意，第一个红框部分，是VS自动为我们在SL APP生成的。它是第二个红框在客户端的对应版本。我们需要将它包含到项目中去。它包含了所有服务端版本类中定义的方法、实体等，而可在客户端直接调用。

6：Ria Service数据流转

好了，经过以上的描述我们知道了：

EDM：直接操作数据库；

Domain Service Class：调用EDM，并把数据接口通过WCF的形式开放给客户端；

*.Web.g.cs：调用Domain Service Class，完成对数据的读取，并最终呈现给UI；

7：最终展示

在SL APP中的UI调用呈现数据。前台：

image

后台，直接使用*.Web.g.cs中的DomainServiceMySample 加载数据：

        public MainPage()
        {
            InitializeComponent();
            DomainServiceMySample context = new DomainServiceMySample();
            context.Load(context.GetEmpQuery());
            lb1.ItemsSource = context.emps;
        }

最后界面显示：

image

8：问题

该示例演示了使用Entity Framework和WCF Ria Services进行Silverlight开发。我们当然可以继续使用此模式完善功能，知道一个功能复杂的应用程序开发完毕。但是，当前，此示例起码存在如下几个问题。

1：实体模型被紧耦合在EDM中，同时它不能项目（模块）使用。随着每一次更新EDM，实体模型会被覆盖；

2：EDM和BLL紧耦合在一起；

3：没有提炼出数据接口，导致我们没有办法在此示例中进行单元测试。示例中虽然存在测试项目，但那是数据库相关的，达不到单元测试的要求；

下篇我们将继续重构该示例，以逐步解决这些问题。

本示例源码下载：SilverlightApplicationSchool20110612.zip

版权声明：本文内容由互联网用户自发贡献，该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务，不拥有所有权，不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容， 请发送邮件至 [email protected] 举报，一经查实，本站将立刻删除。

相关推荐

c# – 如何在Silverlight 4中绑定ContextMenu的IsEnabled属性？
如何在Silverlight4(XAML)中绑定IsEnabled属性？我试过简单的IsEnabled=“{BindingABC}”,但这不起作用–MenuItem总是启用.提前感谢您的线索！干杯编辑：有趣的是,当设置Mode=TwoWay时,绑定似乎有效.但是,在菜单项上...
c# – 使用Silverlight / windows手机式控件设置我的.Net桌面应用程序GUI
我正在编写我的第一个vb.net应用程序(但我也会在这里标记c#,因为我确信即使是一个c#人也可以使用类似的.net实现来回答这个问题).我申请的简短说明：我的桌面应用程序将仅在win平台上运行,使用vb.net,它是一个简单的网...
c# – Silverlight：将服务调用和文件处理移动到后台线程
ProcessFile()是在UIThread上运行还是在单独的线程上运行.如果它在UIThread上,如何将文件请求和ProcessFile()移动到单独的线程？varxClient=newServiceReference1.Service1SoapClient();xClient.Retrieve_File_Compl...
c# – 如何从ASP.NET / Silverlight开发人员成为sharepoint开发人员？
我从同行那里听说,对sharepoint的了解对职业生涯有益.我们不在办公室使用sharepoint.所以不知道如何开始.这些是我的新手问题>学习共享点值得努力吗？>学习sharepoint的资源在哪里？>我是否应该考虑开发哪些...
c# – Windows Phone 8 – 将列表保存到IsolatedStorage
我正在尝试保存一个类我的类对象的集合.我收到一个错误说明：Thecollectiondatacontracttype‘System.Collections.Generic.Listcannotbedeserializedbecauseitdoesnothaveapublicparameterlessconstructor.Addingapu...
c# – 在XAML中使用绑定设置样式
我需要根据Silverlight中的某些配置值设置给定控件的Style.我想有可能从两种可用的样式(静态资源)中选择一个控件样式.我试图做一些像：<TextBoxStyle="{BindingABC}"/>哪里publicstringABC{get{retu...
Android设备上的Silverlight / Moonlight
我刚买了第一台Android设备,我喜欢它…我也很喜欢你可以创建自己的应用程序并随意分发它们.我已经阅读了一些关于Monodroid的内容,而且显然微软希望将Silverlight放在这些设备上,尽管没有太多关于它们的信息……但是M...
c# – 从silverlight应用程序访问SQL Server数据库
我们的ASP.NET网站允许用户执行各种查询,并根据从数据库查询的结果显示网络图(如UML图).目前,我们正在生成一个位图并显示它.但由于我们需要支持允许用户以交互方式显示/隐藏某些块的功能,因此我们计划使用Silverligh...
c# – 自定义Silverlight启动画面导致白屏死机
我正在开发一个Silverlight4应用程序,我已经创建了一个自定义的启动画面.乍一看,自定义启动画面运行良好–非常好.几天后,我开始注意到闪屏不再显示,屏幕仍然是空白.这似乎只发生在我打开多个指向同一个应用程序的IE选...
c# – 使用带偏移的RotateTransform问题旋转图像
这是我的XAML：<ImageVerticalAlignment="Center"HorizontalAlignment="Center"Source="{BindingInput,Converter={StaticResourceByteArrayToBitmapConverter}}"><Image.Ren...
    pythonJavaScriptjavaHTMLreactjsC#AndroidCSSNode.jssqlrpython-3.xMysqLjQueryc++pandasFlutterangularIOSdjangolinuxswifttypescript路由器JSON路由器设置无线路由器h3c华三华三路由器设置华三路由器电脑软件教程arraysdocker软件图文教程Cvue.jslaravelspring-bootreact-native