ASP.NET创建XML Web服务全接触(7)

作者：风未起时来源：中国站长学院发布时间：2007-2-6 17:02:53

设计方针(2)

　　通过因特网产生许多服务请求可能影响客户应用程序的性能。当设计你的XML Web服务时，通过创建把有关信息集中在一起的方法可以有效利用服务请求。例如，假定你有一个XML Web服务，用来检索一本书的信息。我们可以创建一个在一条服务请求中返回所有的信息的方法，来代替单独的检索书名、作者和出版社的方法。一次传送大块的信息比多次传送小块的信息更有效率。

　　下面的代码示例解释如何把有关信息组织到单个XML Web服务方法中。

[C#]
＜%@ WebService Language="C#" Class="DataService" %＞
using System;
using System.Data;
using System.Data.SqlClient;
using System.Web.Services;
public class DataService {
[WebMethod]
public DataSet GetTitleAuthors() {
SqlConnection myConnection = new SqlConnection("Persist Security Info=False;Integrated Security=SSPI;server=localhost;database=pubs");
SqlDataAdapter myCommand1 = new SqlDataAdapter ("select * from Authors", myConnection);
SqlDataAdapter myCommand2 = new SqlDataAdapter("select * from Titles", myConnection);
DataSet ds = new DataSet();
myCommand1.Fill(ds, "Authors");
myCommand2.Fill(ds, "Titles");
return ds;
}
}
[Visual Basic]
＜%@ WebService Language="VB" Class="DataService" %＞
Imports System
Imports System.Data
Imports System.Data.SqlClient
Imports System.Web.Services
Public Class DataService
＜WebMethod＞ _
Public Function GetTitleAuthors() As DataSet
Dim myConnection As New SqlConnection("Persist Security Info=False;Integrated Security=SSPI;server=localhost;database=pubs")
Dim myCommand1 As New SqlDataAdapter("select * from Authors", myConnection)
Dim myCommand2 As New SqlDataAdapter("select * from Titles", myConnection)
Dim ds As New DataSet()
myCommand1.Fill(ds, "Authors")
myCommand2.Fill(ds, "Titles")
Return ds
End Function
End Class

　　当设计你的XML Web服务时，请确保使用标准的面向对象编程操作。使用封装来隐藏实现细节。对于更复杂的XML Web服务，你可以使用继承和多态性来再次使用代码并简化你的设计。

　　下面的代码示例显示如何使用继承来创建一个执行数学计算的XML Web服务。

[C#]
＜%@ WebService Language="C#" Class="Add" %＞
using System;
using System.Web.Services;
abstract public class MathService : WebService
{
　[WebMethod]
　abstract public float CalculateTotal(float a, float b);
}
public class Add : MathService
{
　[WebMethod]
　override public float CalculateTotal(float a, float b)
　{
　　return a + b;
　}
}
public class Subtract : MathService
{
　[WebMethod]
　override public float CalculateTotal(float a, float b)
　{
　　return a - b;
　}
}
public class Multiply : MathService
{
　[WebMethod]
　override public float CalculateTotal(float a, float b)
　{
　　return a * b;
　}
}
public class Divide : MathService
{
　[WebMethod]
　override public float CalculateTotal(float a, float b)
　{
　　if (b==0)
　　　return -1;
　　else
　　　return a / b;
　}
}
[Visual Basic]
＜%@ WebService Language="VB" Class="Add" %＞
Imports System
Imports System.Web.Services
MustInherit Public Class MathService : Inherits WebService
＜WebMethod＞ _
Public MustOverride Function CalculateTotal(a As Single, _
b As Single) As Single
End Class
Public Class Add : Inherits MathService
＜WebMethod＞ Public Overrides Function CalculateTotal(a As Single, b As Single) As Single
Return a + b
End Function
End Class
Public Class Subtract : Inherits MathService
＜WebMethod＞ Public Overrides Function CalculateTotal(a As Single, b As Single) As Single
Return a - b
End Function
End Class
Public Class Multiply : Inherits MathService
＜WebMethod＞ Public Overrides Function CalculateTotal(a As Single, b As Single) As Single
Return a * b
End Function
End Class
Public Class Divide : Inherits MathService
＜WebMethod＞ Public Overrides Function CalculateTotal(a As Single, b As Single) As Single
　If b = 0 Then
　　Return - 1
　Else
　　Return a / b
　End If
End Function
End Class