VS2005＋SQL2005 Reporting动态增加报表(*.rdlc)数据源

前言：

在阅读本篇文章前，我建议您先阅读我之前写的另一篇关于VS2005中如何将datast动态绑定到reportViewer的文章：VS2005＋SQL2005 Reporting Service动态绑定报表（Web），因为该篇可以说是对上一篇的补充。

关于本例子的例程下载：https://files.cnblogs.com/carlwave/exdynamicreport.rar

目的：

通过代码生成ado.net DataSet，然后绑定到reportViewer，基本上实现完全代码化，动态化，使对报表操作更方便。

在上篇中我对如何使用ado.net DataSet动态绑定到reportViewer作了详细介绍，只是上篇中自己留下个疑问，就是对report这个xml文件本身的设计变得相当复杂，通过和网上朋友的交流以及查询资料，写了一个对报表xml文件操作的类，基本实现完全动态化报表操作。

对报表（*.rdlc）文件进行操作：

其实，要生成一个rdlc文件并绑定上数据是有很多方法的。

1、静态：使用微软自带的向导生成dataset，绑定上报表。

2、完全动态：由于rdlc文件原本就是一个XML文件，所以你可以完全自行在代码中生成一个xml文件，但是这个方案也不让人满意，原因是：所有的报表对象都得自己生成，没有可视化工具的设计既繁琐又复杂。特别是如果设计几个line，然后再来上几个分组的话，工作量巨大。

3、部分动态：首先加载rdlc文件到一个XmlDocument对象；然后修改xml内容；把xml序列化成字节流，交给ReportViewer显示。该方案缺点在于每次运行都需要重新加载rdlc，修改，增加了代码复杂度和运算量。

4、 动态修改rdlc文件－>静态调用：这个方案就是我这里要介绍的方案，该方案通过对已经生成的rdlc文件进行读写操作，动态加入了ado.net dataset生成的字段和数据源。
优点在于只需要在第一次和dataset数据源变化的时候对报表的数据源部分进行重新读写就可。

PS：关于完全动态和部分动态可以参考：http://www.weste.net/2006/5-29/15422156045.html

详细操作步骤：

1、新建一个解决方案，增加一个Web项目。

2、增加一个报表文件。（图）

3、增加报表xml操作的RdlcDataSet类，这个类是我纯粹为了报表文件关于数据连接写的，由于使用性比较单一，实现了大部分功能，但是总的来说封装的不是最好，如果你要对报表文件有更多的需求，可以重新封装这个类，具体怎么调用看代码。

'------------------------------------------------------------------------------
2

'--ClassName: RdlcDataSet
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'--Description: for reset the report file(*.rdlc),add the DataSets files and datasources
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'-- If you want to use this class, you should do:
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'-- First:Use Vs2005 to creat a report file(*.rdlc)
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'-- Second:create a ado.net dataset and pass it to this class
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'-- Third:run in your codes EX:Dim objRdlcDataSet As New RdlcDataSet
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'-- objRdlcDataSet.RdlcDataSetNew("Reports\temp.rdlc", "Northwind", "Northwind", dataset)
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'-- Your just need to run it only once.
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'--Input: ado.net dataset, DataSourceName,dataSetName
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'--Output :
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'--08/31/06 - Created (Fei)
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'-- just run once
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'-- ex:Dim objRdlcDataSet As New RdlcDataSet
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'-- objRdlcDataSet.RdlcDataSetNew("Reports\temp.rdlc", "Northwind", "Northwind", dataset)
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'--
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'-- if you just want to add a dataset in exist datasets
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'-- ex:Dim objRdlcDataSet As New RdlcDataSet
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'-- objRdlcDataSet.RdlcFileCheck("Reports\temp.rdlc")
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'-- objRdlcDataSet.AddDataSet(DataSetName, DataSourceName, DataSetAdd)
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Imports System.Data
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Imports System.Data.SqlClient
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Imports System.Xml
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Imports System.IO
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Public Class RdlcDataSet
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Inherits System.Web.UI.Page
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Private mErrorMessage As String
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Private mXmlReport As XmlDocument
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Private mRdlcPath As String
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Private mNodeReport As XmlNode
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Public Property ErrorMessage() As String
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Get
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Return mErrorMessage
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End Get
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Set(ByVal Value As String)
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mErrorMessage = Value
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End Set
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End Property
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'the path of the *.rdlc
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'ex:"Report\temp.rdlc"
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Public Property RdlcPath() As String
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Get
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Return mRdlcPath
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End Get
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Set(ByVal Value As String)
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mRdlcPath = Value
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End Set
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End Property
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Public Property XmlReport() As XmlDocument
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Get
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Return mXmlReport
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End Get
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Set(ByVal Value As XmlDocument)
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mXmlReport = Value
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End Set
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End Property
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Public Property NodeReport() As XmlElement
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Get
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Return mNodeReport
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End Get
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Set(ByVal Value As XmlElement)
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mNodeReport = Value
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End Set
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End Property
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'for reset the rdlc file and add datasources and datasets
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'ex:objRdlcDataSet.RdlcDataSet("Reports\temp.rdlc", "Northwind", "Northwind", dataset)
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Public Function RdlcDataSetNew(ByVal RdlcPath As String, ByVal DataSourceName As String, ByVal DataSetName As String, ByVal DataSetAdd As DataSet) As Boolean
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Dim blnResult As Boolean
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blnResult = RdlcFileCheck(RdlcPath)
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If blnResult = False Then
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Return False
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Exit Function
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End If
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Call RdlcDataSetInit()
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Call AddDataSource(DataSourceName)
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Call AddDataSet(DataSetName, DataSourceName, DataSetAdd)
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End Function
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'for check the rdlc file
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'in this class it can only for the *.rdlc which is grnerate by VS2005
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Public Function RdlcFileCheck(ByVal RdlcPath As String) As Boolean
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Dim strChkRdlc As String
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strChkRdlc = RdlcPath.Substring(RdlcPath.Length - 4, 4)
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strChkRdlc = strChkRdlc.ToLower
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'if not report file return false
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If strChkRdlc.CompareTo("rdlc") <> 0 Then
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Me.ErrorMessage = "File is not a report file.(With *.rdlc)"
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Return False
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Exit Function
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End If
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RdlcPath = Server.MapPath(RdlcPath)
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Dim xmlReport As New XmlDocument
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xmlReport.Load(RdlcPath)
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Dim nodeReport As XmlNode
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nodeReport = xmlReport.ChildNodes(1)
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If nodeReport.Name.CompareTo("Report") <> 0 Then
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Me.ErrorMessage = "File is not a report file grnerate by VS2005."
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Return False
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Exit Function
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End If
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Me.NodeReport = nodeReport
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Me.RdlcPath = RdlcPath
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Me.XmlReport = xmlReport
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Return True
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End Function
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'for Rdlc init
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'delete all datasets and datasources
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'and add new empty datasets and datasources
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Public Sub RdlcDataSetInit()
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Call DelReportNodes("DataSources")
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Call DelReportNodes("DataSets")
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Call AddReportNodes("DataSources")
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Call AddReportNodes("DataSets")
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Me.XmlReport.Save(Me.RdlcPath)
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End Sub
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Private Sub DelReportNodes(ByVal strDelName As String)
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Dim nodelistDel As XmlNodeList
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nodelistDel = Me.NodeReport.ChildNodes
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Dim elmDel As XmlElement
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Dim i As Int32
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For i = 0 To nodelistDel.Count - 1
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elmDel = nodelistDel.Item(i)
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If elmDel.Name.CompareTo(strDelName) = 0 Then
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Me.NodeReport.RemoveChild(elmDel)
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i = i - 1
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End If
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If i = nodelistDel.Count - 1 Then
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Exit For
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End If
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Next
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End Sub
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Private Sub AddReportNodes(ByVal strAddName As String)
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Dim elmAdd As XmlElement
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elmAdd = Me.XmlReport.CreateElement("", strAddName, "")
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elmAdd.SetAttribute("xmlns", Me.NodeReport.NamespaceURI)
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Me.NodeReport.AppendChild(elmAdd)
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End Sub
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'add datasource
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'xml:<DataSources>
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'<DataSource Name="DataSourceName">
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' <ConnectionProperties>
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' <ConnectString />
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' <DataProvider>SQL</DataProvider>
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' </ConnectionProperties>
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'</DataSource>
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'</DataSources>
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Public Sub AddDataSource(ByVal DataSourceName As String)
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Dim i As Int32
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Dim blnResult As Boolean = False
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Dim nodeDataSources As XmlNode = Me.NodeReport
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Dim nodelistAddDataSource As XmlNodeList
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nodelistAddDataSource = Me.NodeReport.ChildNodes
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Dim elmDataSources As XmlElement
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For i = 0 To nodelistAddDataSource.Count - 1
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elmDataSources = nodelistAddDataSource.Item(i)
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If elmDataSources.Name.CompareTo("DataSources") = 0 Then
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nodeDataSources = elmDataSources
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blnResult = True
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Exit For
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End If
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Next
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If blnResult = False Then
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Me.ErrorMessage = "node DataSources hasn't found"
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Exit Sub
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End If
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Dim elmDataSource As XmlElement
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elmDataSource = Me.XmlReport.CreateElement("DataSource")
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elmDataSource.SetAttribute("Name", DataSourceName)
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Dim elmConnectionProperties As XmlElement
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elmConnectionProperties = Me.XmlReport.CreateElement("ConnectionProperties")
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Dim elmConnectString As XmlElement
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elmConnectString = Me.XmlReport.CreateElement("ConnectString")
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Dim elmDataProvider As XmlElement
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elmDataProvider = Me.XmlReport.CreateElement("DataProvider")
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elmDataProvider.InnerText = "SQL"
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elmConnectionProperties.AppendChild(elmconnectstring)
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elmConnectionProperties.AppendChild(elmDataProvider)
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elmDataSource.AppendChild(elmConnectionProperties)
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nodeDataSources.AppendChild(elmDataSource)
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Me.XmlReport.Save(Me.RdlcPath)
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End Sub
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'--------------------------------------------------------------------------
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'--add datasets
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'--xml:
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'--<DataSets>
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'-- <DataSet Name="DataSetName">
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'-- <Fields>
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'-- <Field Name="DataFieldName">
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'-- <DataField>DataFieldName</DataField>
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'-- </Field>
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'-- </Fields>
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'-- <Query>
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'-- <DataSourceName>DataSourceName</DataSourceName>
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'-- <CommandText>
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'-- </CommandText>
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'-- <Timeout>30</Timeout>
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'-- </Query>
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'-- </DataSet>
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'--</DataSets>
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'----------------------------------------------------------------------
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Private Sub AddDataSet(ByVal DataSetName As String, ByVal DataSourceName As String, ByVal dsAdd As DataSet)
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Dim i As Int32
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Dim blnResult As Boolean = False
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Dim nodeDataSets As XmlNode = Me.NodeReport
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Dim nodelistAddDataSource As XmlNodeList
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nodelistAddDataSource = Me.NodeReport.ChildNodes
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Dim elmDataSources As XmlElement
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For i = 0 To nodelistAddDataSource.Count - 1
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elmDataSources = nodelistAddDataSource.Item(i)
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If elmDataSources.Name.CompareTo("DataSets") = 0 Then
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nodeDataSets = elmDataSources
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blnResult = True
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Exit For
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Else
228

229

End If
230

Next
231

If blnResult = False Then
232

Me.ErrorMessage = "node DataSets hasn't found"
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Exit Sub
234

End If
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Dim elmDataSet As XmlElement
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elmDataSet = Me.XmlReport.CreateElement("DataSet")
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elmDataSet.SetAttribute("Name", DataSetName)
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Dim elmFields As XmlElement
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elmFields = Me.XmlReport.CreateElement("Fields")
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Dim elmField As XmlElement
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For i = 0 To dsAdd.Tables(0).Columns.Count - 1
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elmField = Me.XmlReport.CreateElement("Field")
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elmField.SetAttribute("Name", dsAdd.Tables(0).Columns(i).ToString)
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Dim elmDataField As XmlElement
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elmDataField = Me.XmlReport.CreateElement("DataField")
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elmDataField.InnerText = dsAdd.Tables(0).Columns(i).ToString
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'Dim elmTypeName As XmlElement
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'elmTypeName = Me.XmlReport.CreateElement("rd:TypeName")
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'elmTypeName.InnerText = dsAdd.Tables(0).Columns(i).DataType.ToString
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elmField.AppendChild(elmDataField)
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'elmField.AppendChild(elmTypeName)
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elmFields.AppendChild(elmField)
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Next
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Dim elmQuery As XmlElement
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elmQuery = Me.XmlReport.CreateElement("Query")
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Dim elmDataSourceName As XmlElement
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elmDataSourceName = Me.XmlReport.CreateElement("DataSourceName")
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elmDataSourceName.InnerText = DataSourceName
259

Dim elmCommandText As XmlElement
260

elmCommandText = Me.XmlReport.CreateElement("CommandText")
261

Dim elmTimeout As XmlElement
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elmTimeout = Me.XmlReport.CreateElement("Timeout")
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elmTimeout.InnerText = "30"
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elmQuery.AppendChild(elmDataSourceName)
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elmQuery.AppendChild(elmCommandText)
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elmQuery.AppendChild(elmTimeout)
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elmDataSet.AppendChild(elmFields)
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elmDataSet.AppendChild(elmQuery)
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nodeDataSets.AppendChild(elmDataSet)
270

271

Me.XmlReport.Save(RdlcPath)
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End Sub
273

274

End Class

4、在代码中生成ado.net dataset，动态调用报表，运行一次（运行一次即可，以后除非dataset的数据源变了，否则可以注释掉）

Partial Class exLoadReport
2

Inherits System.Web.UI.Page
3

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
5

If Not Page.IsPostBack Then
6

LoadCustomersReport("Reports\Customers.rdlc", "Northwind", "dsCustomers")
7

End If
8

End Sub
9

Private Function GetCustomers() As DataSet
11

Dim dsGetCustomers As New DataSet
12

Dim sqlGetCustomers As String = "SELECT * from Customers where city in (select city from Customers group by city having count(city)>=2)"
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Using connection As New SqlConnection("Data Source=(local);Initial Catalog=Northwind;User ID=sa;Password=;")
14

Dim command As New SqlCommand(sqlGetCustomers, connection)
15

Dim adpGetCustomers As New SqlDataAdapter(command)
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adpGetCustomers.Fill(dsGetCustomers, "dsGetCustomers")
17

End Using
18

Return dsGetCustomers
19

End Function
20

Private Sub LoadCustomersReport(ByVal RdlcPath As String, ByVal DataSourceName As String, ByVal DataSetName As String)
22

'get the dataset
23

Dim tmpDs As DataSet
24

tmpDs = GetCustomers()
25

'------------------------------------------------------------------
26

'you must run these codes blew before the first time you load the report.
27

'After that, if you haven't changer the ado.net dataset, you don't need
28

'to run it again.
29

'------------------------------------------------------------------
30

'reset the report file(*.rdlc) add 'DataSets' and 'DataSource'
31

'Dim objRdlcDataSet As New RdlcDataSet
33

'objRdlcDataSet.RdlcDataSetNew(RdlcPath, DataSourceName, DataSetName, tmpDs)
34

'------------------------------------------------------------------
35

'set the reportViewer
37

rpvEx.ProcessingMode = ProcessingMode.Local
38

Dim localReport As LocalReport
39

localReport = rpvEx.LocalReport
40

localReport.ReportPath = RdlcPath
41

'Create a report data source for the sales order data
42

Dim dsCustomers As New ReportDataSource()
43

dsCustomers.Name = DataSetName
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dsCustomers.Value = tmpDs.Tables(0)
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localReport.DataSources.Add(dsCustomers)
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localReport.Refresh()
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End Sub
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End Class

5、设计报表，增加一个table，在table的属性中输入dataset的名字，注意：这个名字必须和你写报表文件所使用的dataset名字相同，否则会报错，找不到dataset。（图）

6、再次运行即可。

PS：例程中的报表文件加入了一些分组以及函数的调用，关于报表的使用我就不描述了，这方面的资料还是比较多的。写的比较仓促，欢迎大家给出意见。

posted on 2011-04-22 08:17 追梦人RUBY 阅读(300) 评论(0) 收藏举报