最近做了个小东西,要用到打印--数据输出,所以想到用水晶报表。
先说说水晶报表,这个东东,的确是不错。功能很强大,特别是对于输出格式,几乎满足工作中的绝大多数要求。十分灵活好用。具体一些技术性的东西,我就不一一赘述了,有兴趣的可以去找些书去看看。
我用的是水晶报表10。对于在报表了连接数据库,相对比较简单,就不说了,现在来看看,如何让报表动态地接受参数,然后形成报表文件,这可能在实际工作地很多情况下,都用得到。
我用到的前台技术是ASP.NET。那么来看看,.NET下关于水晶报表参数的一些API:parameterfields类、parameterfield类、parameterdiscretevalue类、parameterrangevalue类等。关于这些API的一些具体的用法,可以参考MSDN.
还要注意使用这些类的时候,要加上如下命名空间:
using CrystalDecisions.CrystalReports .Engine ;
using CrystalDecisions.Shared ;
下面来看看具体的代码使用:
using CrystalDecisions.Shared ;
下面来看看具体的代码使用:
#region--------------向报表传递参数--------------------
ParameterFields paraFields =new ParameterFields ();
ParameterField[] paraField=new ParameterField [8];
ParameterDiscreteValue[] discreteValue=new ParameterDiscreteValue [8];
ParameterRangeValue rangeValue=new ParameterRangeValue ();
ParameterField[] paraField=new ParameterField [8];
ParameterDiscreteValue[] discreteValue=new ParameterDiscreteValue [8];
ParameterRangeValue rangeValue=new ParameterRangeValue ();
paraField[0]=new ParameterField ();
paraField[0].ParameterFieldName ="Name";
discreteValue[0]=new ParameterDiscreteValue ();
discreteValue[0].Value =(string)Session["Name"];
paraField[0].CurrentValues .Add (discreteValue[0]);
paraField[0].ParameterFieldName ="Name";
discreteValue[0]=new ParameterDiscreteValue ();
discreteValue[0].Value =(string)Session["Name"];
paraField[0].CurrentValues .Add (discreteValue[0]);
paraField[1]=new ParameterField ();
paraField[1].Name ="MajorName";
discreteValue[1]=new ParameterDiscreteValue ();
discreteValue[1].Value =(string)Session["MajorName"];
paraField[1].CurrentValues .Add (discreteValue[1] );
paraField[1].Name ="MajorName";
discreteValue[1]=new ParameterDiscreteValue ();
discreteValue[1].Value =(string)Session["MajorName"];
paraField[1].CurrentValues .Add (discreteValue[1] );
paraField[2]=new ParameterField ();
paraField[2].Name ="YearName";
discreteValue[2]=new ParameterDiscreteValue ();
discreteValue[2].Value =(string)Session["YearName"];
paraField[2].CurrentValues .Add (discreteValue[2]);
paraField[2].Name ="YearName";
discreteValue[2]=new ParameterDiscreteValue ();
discreteValue[2].Value =(string)Session["YearName"];
paraField[2].CurrentValues .Add (discreteValue[2]);
paraField[3]=new ParameterField ();
paraField[3].Name ="TuitionPay";
discreteValue[3]=new ParameterDiscreteValue ();
discreteValue[3].Value =Convert.ToDecimal (Session["TuitionPay"]);
paraField[3].CurrentValues .Add (discreteValue[3]);
paraField[3].Name ="TuitionPay";
discreteValue[3]=new ParameterDiscreteValue ();
discreteValue[3].Value =Convert.ToDecimal (Session["TuitionPay"]);
paraField[3].CurrentValues .Add (discreteValue[3]);
paraField[4]=new ParameterField ();
paraField[4].Name ="TuitionOwed";
discreteValue[4]=new ParameterDiscreteValue ();
discreteValue[4].Value =Convert.ToDecimal (Session["TuitionOwed"]);
paraField[4].CurrentValues .Add (discreteValue[4]);
paraField[4].Name ="TuitionOwed";
discreteValue[4]=new ParameterDiscreteValue ();
discreteValue[4].Value =Convert.ToDecimal (Session["TuitionOwed"]);
paraField[4].CurrentValues .Add (discreteValue[4]);
paraField[5]=new ParameterField ();
paraField[5].Name ="Year";
discreteValue[5]=new ParameterDiscreteValue ();
discreteValue[5].Value =(string)Session["Year"];
paraField[5].CurrentValues .Add (discreteValue[5]);
paraField[5].Name ="Year";
discreteValue[5]=new ParameterDiscreteValue ();
discreteValue[5].Value =(string)Session["Year"];
paraField[5].CurrentValues .Add (discreteValue[5]);
paraField[6]=new ParameterField ();
paraField[6].Name ="Month";
discreteValue[6]=new ParameterDiscreteValue ();
discreteValue[6].Value =(string)Session["Month"];
paraField[6].CurrentValues .Add (discreteValue[6]);
paraField[6].Name ="Month";
discreteValue[6]=new ParameterDiscreteValue ();
discreteValue[6].Value =(string)Session["Month"];
paraField[6].CurrentValues .Add (discreteValue[6]);
paraField[7]=new ParameterField ();
paraField[7].Name ="Day";
discreteValue[7]=new ParameterDiscreteValue ();
discreteValue[7].Value =(string)Session["Day"];
paraField[7].CurrentValues .Add (discreteValue[7]);
foreach(ParameterField pf in paraField)
{
paraFields.Add (pf);
}
ReportDocument rptdoc=new ReportDocument ();
rptdoc.Load (Server.MapPath ("../agreementTest.rpt"));
this.CrystalReportViewer1.ReportSource =rptdoc;
this.CrystalReportViewer1.ParameterFieldInfo =paraFields;
this.CrystalReportViewer1 .DataBind ();
//this.CrystalReportViewer1 .RefreshReport ();
#endregion
paraField[7].Name ="Day";
discreteValue[7]=new ParameterDiscreteValue ();
discreteValue[7].Value =(string)Session["Day"];
paraField[7].CurrentValues .Add (discreteValue[7]);
foreach(ParameterField pf in paraField)
{
paraFields.Add (pf);
}
ReportDocument rptdoc=new ReportDocument ();
rptdoc.Load (Server.MapPath ("../agreementTest.rpt"));
this.CrystalReportViewer1.ReportSource =rptdoc;
this.CrystalReportViewer1.ParameterFieldInfo =paraFields;
this.CrystalReportViewer1 .DataBind ();
//this.CrystalReportViewer1 .RefreshReport ();
#endregion
需要说明的是,必须在水晶报表里面先创建这些参数,才可以使用(而且报表里的参数和代码里的参数保持一致)。另外就是在水晶报表10里参数创建的时候,可以选择创建离散值参数(discrete),也可以选择创建连续值参数(range),那么对应的代码中要用不同的类(parameterdiscretevalue和parameterrangevalue)。