上一篇Using LINQ in ASP.NET (1) 中介绍了利用LINQ to SQL实现对数据的增删改的操作，但是在实 际的项目应用中，我们经常会使用到存储过程。本篇将介绍如何利用LINQ对存储过程进行操作。
我们利用的还是Northwind数据库，首先创建存储过程：
（1）返回所有EMPLOYEES 的信息
CREATE PROCEDURE [dbo].[Employees_GetAll]
AS
SELECT * FROM EMPLOYEES ORDER BY EMPLOYEEID
（2）根据EMPLOYEEID获得信息
CREATE PROCEDURE [dbo].[Employees_GetByID]
(
@ID int
)
AS
SELECT * FROM EMPLOYEES WHERE EMPLOYEEID=@ID
（3）添加职员信息
CREATE PROCEDURE [dbo].[Employees_Insert]
(
@FIRSTNAME NVARCHAR(20),
@LASTNAME NVARCHAR(20)
)
AS
INSERT INTO EMPLOYEES(FIRSTNAME,LASTNAME)
VALUES(@FIRSTNAME,@LASTNAME)
（4）更新职员信息
CREATE PROCEDURE [dbo].[Employees_Update]
(
@ID INT,
@FIRSTNAME NVARCHAR(20),
@LASTNAME NVARCHAR(20)
)
AS
UPDATE EMPLOYEES
SET FIRSTNAME=@FIRSTNAME,
LASTNAME=@LASTNAME
WHERE EMPLOYEEID=@ID
（5）删除职员信息
CREATE PROCEDURE [dbo].[Employees_Delete]
(
@ID INT
)
AS
DELETE FROM EMPLOYEES WHERE EMPLOYEEID=@ID
前面我们知道了如何将一个数据表映射为实体类，现在我们要将存储过程也相应的映射成为实体类， 创建LINQ to SQL 的类文件。
[Function(Name = "Employees_GetAll")]
public ISingleResult<Employee> GetAllEmployees()
{
IExecuteResult result = this.ExecuteMethodCall
(this, ((MethodInfo)(MethodInfo.GetCurrentMethod())));
return ((ISingleResult<Employee>)(result.ReturnValue));
}
GetAllEmployees() 方法利用[Function]属性进行描述，由于存储过程的返回值可能是一个或多个 记录，方法返回值的类型必须和ISingleResult类型相匹配。存储过程返回的字段页必须和Employee类中 声明的相一致。
GetEmployeeByID() 接收一个参数，并且返回一行
[Function(Name="Employees_GetByID")]
public ISingleResult<Employee> GetEmployeeByID
([Parameter(Name = "ID", DbType = "Int")]
System.Nullable<int> iD)
{
IExecuteResult result = this.ExecuteMethodCall
(this, ((MethodInfo)(MethodInfo.GetCurrentMethod())),
iD);
return ((ISingleResult<Employee>)(result.ReturnValue));
}
调用存储过程的时候需要传入一个参数，方法的参数和存储类型的参数可以用[Parameter] 进行匹配 。参数传给ExecuteMethodCall() 方法。大多数的代码都是差不多的。
下面是对数据添加，删除，修改的方法
[Function(Name = "Employees_Insert")]
public int InsertEmployee([Parameter(Name = "FirstName", DbType = "nvarchar (20)")] string fname, [Parameter(Name = "LastName", DbType = "nvarchar(20)")]string lname)
{
IExecuteResult result = this.ExecuteMethodCall(this, ((MethodInfo) (MethodInfo.GetCurrentMethod())),fname,lname);
return (int)result.ReturnValue;
}
[Function(Name = "Employees_Update")]
public int UpdateEmployee([Parameter(Name = "ID", DbType = "Int")] System.Nullable<int> iD, [Parameter(Name = "FirstName", DbType = "nvarchar(20)")] string fname, [Parameter(Name = "LastName", DbType = "nvarchar(20)")]string lname)
{
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