Imports CrystalDecisions.Shared Imports CrystalDecisions.CrystalReports.Engine
Private Const RPT_NAME As String = "CustomerOrders.rpt" Private Const PARAMETER_FIELD_NAME As String = "CustomerID"
Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load '在此处放置初始化页的用户代码
' 设置报表源 report = New ReportDocument() report.Load(GetReportPath(RPT_NAME))
' 设置参数 crvOrders.ParameterFieldInfo = GetParameterInfo(CType(Session("list"), ListItemCollection))
crvOrders.ReportSource = report
' 显示报表 crvOrders.DataBind()
End Sub '---------------------------------------------------------------- ' Function GetParameterInfo: ' 从复选框列表获取参数字段信息 ' Returns: ' 参数字段 ' Parameters: ' [in] list: 复选框列表 ' Throws: ' ' PreConditions: ' '---------------------------------------------------------------- Private Function GetParameterInfo(ByVal list As ListItemCollection) As ParameterFields
Dim item As ListItem Dim isEmpty As Boolean = True Dim itemCount As Integer = 0
' 声明将参数传递给查看器控件所需的变量。 Dim paramFields As New ParameterFields() Dim paramField As New ParameterField() Dim discreteVal As New ParameterDiscreteValue()
' 参数是具有多个值的离散参数。
' 设置参数字段的名称,它必须和报表中的参数相符。 paramField.ParameterFieldName = PARAMETER_FIELD_NAME
For Each item In list If item.Selected Then isEmpty = False itemCount += 1
' 设置一个离散值并将其传递给该参数 discreteVal.Value = item.Value paramField.CurrentValues.Add(discreteVal) ' 新建一个离散值 discreteVal = New ParameterDiscreteValue() End If Next
If isEmpty Then For Each item In list ' 设置一个离散值并将其传递给该参数 discreteVal.Value = item.Value paramField.CurrentValues.Add(discreteVal) ' 新建一个离散值 discreteVal = New ParameterDiscreteValue() Next End If
' 将该参数添加到参数字段集合。 paramFields.Add(paramField) GetParameterInfo = paramFields
End Function 
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