XML Web Service 数据交换
客户端调用服务器端的 Web 服务并传递包含数据的 DataSet (ds)：
Private Sub Synchronize() Dim username As String = "JohnS" Dim blnSuccess As Boolean ' 使用 XML Web Service 进行同步 Cursor.Current = Cursors.WaitCursor Dim wsFeedback As New wsFeedback.feedback blnSuccess = wsFeedback.InsertFeedback(ds, username)
Cursor.Current = Cursors.DefaultEnd Sub
服务器端的 Web 服务接受 DataSet 并将 XML 直接传递到 SQL Server 2000 存储的过程中，该过程使用 SQLXML（英文）和 OPENXML 解析 XML 并将新数据插入适当的表格。
_Public Function InsertFeedback(ByVal ds As DataSet, ByVal username As String) As Boolean Dim con As New SqlConnection(connectionstring) Dim cmd As New SqlCommand("p_Feedback_i", con) cmd.CommandType = CommandType.StoredProcedure
' 设置参数 Dim prmXML As SqlParameter = cmd.Parameters.Add("@XML", SqlDbType.NText) prmXML.Direction = ParameterDirection.Input prmXML.Value = ds.GetXml
Dim prmUsername As SqlParameter = cmd.Parameters.Add("@Username", SqlDbType.NVarChar) prmUsername.Direction = ParameterDirection.Input prmUsername.Value = username

Try con.Open() cmd.ExecuteNonQuery() Catch ex As Exception ' 处理、记录并重掷错误 Throw ex
Finally con.Close() End Try
Return True
End Function
The stored procedure inserts the new data:
CREATE PROCEDURE p_Feedback_i @XML ntext, @Username nvarchar(50)
AS
SET NOCOUNT ON
DECLARE @iDoc integerDECLARE @Error integer
/* Create XML document. */EXEC sp_xml_preparedocument @iDoc OUTPUT, @XML
/* Insert new records */INSERT INTO Feedback ( FeedbackID, PlantSection, Part, DefectScope, ScopeID, DefectType, RichInk, Username )SELECT ID, PlantSection, Part, DefectScope, ScopeID, DefectType, RichInk, @UsernameFROM OPENXML (@iDoc, '/DataSet/Feedback',2) WITH ( ID uniqueidentifier, PlantSection int, Part int, DefectScope int, ScopeID nvarchar(50), DefectType int, RichInk nvarchar(50) )
SELECT @Error = @@ERRORIF (@Error <> 0)BEGIN GOTO ErrorhandlerEND
/* Remove the XML document*/EXEC sp_xml_removedocument @iDoc
RETURN
Errorhandler:
IF NOT @iDoc IS NULL EXEC sp_xml_removedocument @iDoc
RAISERROR (@Error,16,1)
RETURN

.net中判断该应用程序是否已经启动,防止重复启动 开发花絮：一个DataList的ItemCommand事件意外

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