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。
{
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
([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
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)
{
IExecuteResult result = this.ExecuteMethodCall(this, ((MethodInfo)(MethodInfo.GetCurrentMethod())),iD,fname, lname);
return (int)result.ReturnValue;
}
[Function(Name = "Employees_Delete")]
public int DeleteEmployee([Parameter(Name = "ID", DbType = "Int")] System.Nullable<int> iD)
{
IExecuteResult result = this.ExecuteMethodCall(this, ((MethodInfo)(MethodInfo.GetCurrentMethod())), iD);
return (int)result.ReturnValue;
}
好了，方法创建好了，接下来就是在ASP.NET Web Form中对这些方法进行调用。
添加一个DetailsView 控件。对它进行数据的绑定，方法和（1）中的基本一样
{
string strConn = ConfigurationManager.ConnectionStrings["connstr"].ConnectionString;
NorthwindDb db = new NorthwindDb(strConn);
ISingleResult<Employee> results = db.GetAllEmployees();
DetailsView1.DataSource = results;
DetailsView1.DataBind();
}
利用DetailsView 控件对数据执行增加，删除，修改的操作
{
string strConn = ConfigurationManager.ConnectionStrings["connstr"].ConnectionString;
NorthwindDb db = new NorthwindDb(strConn);
db.UpdateEmployee((int)DetailsView1.SelectedValue,((TextBox)DetailsView1.Rows[1].Cells[1].Controls[0]).Text, ((TextBox)DetailsView1.Rows[2].Cells[1].Controls[0]).Text);
}
protected void DetailsView1_ItemInserting(object sender, DetailsViewInsertEventArgs e)
{
string strConn = ConfigurationManager.ConnectionStrings["connstr"].ConnectionString;
NorthwindDb db = new NorthwindDb(strConn);
db.InsertEmployee(((TextBox)DetailsView1.Rows[1].Cells[1].Controls[0]).Text, ((TextBox)DetailsView1.Rows[2].Cells[1].Controls[0]).Text);
}
protected void DetailsView1_ItemDeleting(object sender, DetailsViewDeleteEventArgs e)
{
string strConn = ConfigurationManager.ConnectionStrings["connstr"].ConnectionString;
NorthwindDb db = new NorthwindDb(strConn);
db.DeleteEmployee((int)DetailsView1.SelectedValue);
}
这样通过存储过程对数据操作就搞定了。
源码：/Files/gaoweipeng/aspLINQ2.rar