ASP.NET中应用XML技术实现Web报表打印

　　笔者为了能够快速实现简单的报表打印，设计了下面的方案。编写一个通用打印页面，要打印报表将参数写入一个XML文档，调用页面XMLReport.aspx?report=报表名，即可完成报表的制作

　　3.1 创建自定义的XML报表文件

　　XML主要用来描述打印报表的名称，数据来源，格式，分页打印等信息，具体标签可自己定义，下面是笔者针对会员管理系统报表打印所制定的XML文档：

MemberList.xml

<?xml version="1.0" encoding="utf-8" ?>

<XmlReport>

     <Page>

         <Title>Member Information</Title>

         <ApplyXSLT></ApplyXSLT>

     </Page>

     <Report>

         <Title>Member List</Title>

         <TableName>MemberList</TableName>

         <SQLdataConnection>Data Source=localhost;User ID=sa;password=;Initial Catalog=XMLReport;</SQLdataConnection>

         <OleDbConnection></OleDbConnection>

         <Sql>Select MemberID, prefix+'. '+ firstname+' '+ surname AS [Member Name],CityOrTown,State,PostCode, '$'+convert(varchar(12),FeesPaid) As Fees From Members;</Sql>

         <PageSize>10</PageSize>

     </Report>

     <Report>

         <Title>Member Summary</Title>

         <TableName>MemberSummary</TableName>

         <SQLdataConnection>Data Source=localhost;User ID=sa;password=;Initial Catalog=XMLReport;</SQLdataConnection>

         <OleDbConnection></OleDbConnection>

         <Sql>Select Count(MemberID) As [Member Count], '$'+convert(varchar(12),Sum(FeesPaid)) As [Fees Total] From Members;</Sql>

         <PageSize></PageSize>

     </Report>

</XmlReport>

标签说明：

Page Title:报表标题

ApplyXSLT:应用样式表定制报表

SQLdaraConnection: 数据源连接字串，数据提供者为SQL server

OleDbConnection:数据源连接字串，数据提供者为OleDb

Sql:选取报表数据的sql语句

PageSize:分页打印，每页显示的记录条数

读者还可以自定义一些更精确的标签来控制报表。

　　3.2 创建通用打印页面

　　page_load时读取要打印的报表名

xmlFile = Request.QueryString["report"].ToString() + ".xml";

        

private void BindReports()

{

     DataSet dsXml = new DataSet();

     try

     {

         dsXml.ReadXml(Server.MapPath("Reports//" + xmlFile));

         DataTable dtPage = dsXml.Tables["Page"];

         DataTable dtReport = dsXml.Tables["Report"];

         labelPageTitle.Text = dtPage.Rows[0]["Title"].ToString();

         for(int i = 0;i < dtReport.Rows.Count; i++)

         {

              GetLabel(i).Text = dtReport.Rows[i]["Title"].ToString();

              if(dtReport.Rows[i]["SQLdataConnection"].ToString() != String.Empty || dtReport.Rows[i]["Sql"].ToString() != String.Empty || dtReport.Rows[i]["OleDbConnection"].ToString() != String.Empty)

              {

                   DataGrid dg = GetDataGrid(i);

                   if(dtReport.Rows[i]["PageSize"].ToString() != String.Empty)

                   {

                       //分页打印

                       dg.AllowPaging = true;

                       dg.PagerStyle.Mode = PagerMode.NumericPages;

                       dg.PagerStyle.PageButtonCount = 10;

                       dg.PageSize = Convert.ToInt32(dtReport.Rows[i]["PageSize"].ToString());

                   }

                   DataSet ds = new DataSet();

                   //从Report.xml读取数据源信息

                   if(dtReport.Rows[i]["SQLdataConnection"].ToString() != String.Empty)

                   {

                       //数据提供者为SQL Server

                       SqlConnection Conn = new SqlConnection(dtReport.Rows[i]["SQLdataConnection"].ToString());

                       SqlDataAdapter myDataAdapt = new SqlDataAdapter(dtReport.Rows[i]["Sql"].ToString(),Conn);

                       myDataAdapt.Fill(ds,dtReport.Rows[i]["TableName"].ToString());

                   }

                   else if(dtReport.Rows[i]["OleDbConnection"].ToString() != String.Empty)

                   {

                       //数据提供者为OLE DB

                       OleDbConnection Conn = new OleDbConnection(dtReport.Rows[i]["OleDbConnection"].ToString());

                       OleDbDataAdapter myDataAdapt = new OleDbDataAdapter(dtReport.Rows[i]["Sql"].ToString(),Conn);

                       myDataAdapt.Fill(ds,dtReport.Rows[i]["TableName"].ToString());

                   }

                       //用通用页面显示报表

                       dg.DataSource = ds;

                       dg.DataBind();

              }   

         }

     }

     catch

     {

         labelPageTitle.Text = "The requested report could not be found";

     }

}

　　3.3 创建定制打印页面

　　需要在XML文档ApplyXSLT标签内添加对应的xslt文件名，并制作相应的样式表放在项目的xslt文件夹下即可。如下代码添加到通用打印程序中。

if(dtPage.Rows[0]["ApplyXSLT"].ToString() != string.Empty )

{

     //用xsl显示报表

     XmlDataDocument xmlDoc = new XmlDataDocument(ds);

     XslTransform xslTran = new XslTransform();

     xslTran.Load(Server.MapPath("xslt//"+dtPage.Rows[0]["ApplyXSLT"].ToString()));

     XmlTextWriter writer = new XmlTextWriter(Server.MapPath("XSLTReports.aspx"), System.Text.Encoding.UTF8);

     xslTran.Transform(xmlDoc, null, writer);

     writer.Close();

     Response.Redirect("XSLTReports.aspx");

}

　　应用xslt样式表可以制作出专业的报表样式，为方便制作，在此推荐使用XMLSpy带的Stylesheet。