设置水晶报表参数值

从asp.net后台代码加载显示有参数的报表文件时,需要给参数赋值

using CrystalDecisions.Shared;
using CrystalDecisions.CrystalReports.Engine;

/// <summary>
/// 绑定显示报表
/// </summary>
private void BindReport()
{
        ReportDocument      report = new ReportDocument(); 

    
    //加载报表
    report.Load(Server.MapPath("./Report/xx.rpt"));

    //绑定报表数据源(crv:CrystalReportViewer报表预览控件名)
    report.SetDataSource(datatable);                          //设置报表数据源
    crv.ReportSource = report;                                //绑定报表文档到预览控件
    crv.ParameterFieldInfo = this.GetReportParameters();      //参数信息
    crv.PageZoomFactor = 100;                                 //缩放100
    crv.DataBind();                                           //绑定报表显示
}

/// <summary>
/// 获得报表参数信息
/// </summary>
private ParameterFields GetParameterFields()
{
    ParameterFields fields = new ParameterFields();

    //单位、部门、人员、日期范围参数
    fields.Add(this.CreateParameterField("@orgname", "单位"));
    fields.Add(this.CreateParameterField("@empname", "人员"));
    fields.Add(this.CreateParameterField("@daterange", "日期"));

    //返回
    return fields;
}

/// <summary>
/// 建立参数字段
/// </summary>
/// <param name="FieldName">字段名</param>
/// <param name="FieldValue">字段值</param>
/// <returns>参数字段</returns>
private ParameterField CreateParameterField(string FieldName, object FieldValue)
{
    ParameterField             field = new ParameterField();
    ParameterDiscreteValue     pvalue = new ParameterDiscreteValue();

    pvalue.Value = FieldValue;
    field.Name = FieldName;
    field.CurrentValues.Add(pvalue);

    //返回参数字段
    return field;
}