LocalReport.SubreportProcessing 事件

在处理子报表时发生。

命名空间：  Microsoft.Reporting.WebForms
程序集：  Microsoft.ReportViewer.WebForms（在 Microsoft.ReportViewer.WebForms.dll 中）

语法

声明
Public Event SubreportProcessing As SubreportProcessingEventHandler
用法
Dim instance As LocalReport
Dim handler As SubreportProcessingEventHandler

AddHandler instance.SubreportProcessing, handler

public event SubreportProcessingEventHandler SubreportProcessing

public:
 event SubreportProcessingEventHandler^ SubreportProcessing {
    void add (SubreportProcessingEventHandler^ value);
    void remove (SubreportProcessingEventHandler^ value);
}

member SubreportProcessing : IEvent<SubreportProcessingEventHandler,
    SubreportProcessingEventArgs>

注释

SubreportProcessing 事件是针对主报表中子报表的每个实例触发的，而不是针对每个子报表定义触发的。如果报表包含同一报表定义中的多个子报表实例，则可以针对每个实例触发此事件。

您必须为子报表中使用的所有数据源提供数据。为此，您必须为 SubreportProcessing 事件提供事件处理程序。

您可以通过检查 Parameters 属性及提供对应于传递到子报表的参数值的数据来检查那些参数值。

如果主报表有数个子报表，您可以检查 SubreportProcessingEventArgs 类的 ReportPath 属性来确定正在处理哪个子报表，从而为相应子报表提供数据。

有关传递到此事件处理程序的参数说明，请参阅 SubreportProcessingEventArgs。

示例

下面的代码示例实现了使用子报表的主/详细信息报表。该代码加载包含子报表的示例报表，并设置事件处理程序来处理 SubreportProcessing 事件。传递到 SubreportProcessing 事件处理程序的参数包括包装子报表的对象。在**“ReportViewer”**控件中呈现子报表之前，事件处理程序会先向此子报表添加数据源实例。

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using Microsoft.Reporting.WebForms;

public partial class _Default : System.Web.UI.Page 
{
    private DataTable orderDetailsData = null;

    private DataTable LoadOrdersData()
    {
        // Load data from XML file
        DataSet dataSet = new DataSet();
        dataSet.ReadXml(@"c:\My Reports\OrderData.xml");
        return dataSet.Tables[0];
    }

    private DataTable LoadOrderDetailsData()
    {
        // Load data from XML file
        DataSet dataSet = new DataSet();
        dataSet.ReadXml(@"c:\My Reports\OrderDetailData.xml");
        return dataSet.Tables[0];
    }

    void DemoSubreportProcessingEventHandler(object sender, SubreportProcessingEventArgs e)
    {
        if (orderDetailsData == null)
            orderDetailsData = LoadOrderDetailsData();
        e.DataSources.Add(new ReportDataSource("DataSet1_OrderDetails", orderDetailsData));
    }
    
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            // Set RDL file
            ReportViewer1.LocalReport.ReportPath = 
                @"c:\My Reports\Orders.rdlc";

            // Supply a DataTable corresponding to each report dataset
            ReportViewer1.LocalReport.DataSources.Add(
                new ReportDataSource("DataSet1_Orders", 
                    LoadOrdersData()));
    }
    // Add a handler for SubreportProcessing
    ReportViewer1.LocalReport.SubreportProcessing += new 
        SubreportProcessingEventHandler(DemoSubreportProcessingEventHandler);

    }
}

using System;
Imports System.Data
Imports Microsoft.Reporting.WebForms

Partial Class _Default
    Inherits System.Web.UI.Page

    Dim orderDetailsData As DataTable = Nothing

    Private Function LoadOrdersData() As DataTable
        Dim dataSet As New DataSet()
        dataSet.ReadXml("c:\My Reports\OrderData.xml")
        LoadOrdersData = dataSet.Tables(0)
    End Function

    Private Function LoadOrderDetailsData()
        Dim dataSet As New DataSet()
        dataSet.ReadXml("c:\My Reports\OrderDetailData.xml")
        LoadOrderDetailsData = dataSet.Tables(0)
    End Function

    Public Sub DemoSubreportProcessingEventHandler(ByVal sender As Object, ByVal e As SubreportProcessingEventArgs)
        If (orderDetailsData Is Nothing) Then
            orderDetailsData = LoadOrderDetailsData()
        End If
        e.DataSources.Add(New ReportDataSource("DataSet1_OrderDetails", orderDetailsData))

    End Sub


    Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

        If (Not IsPostBack) Then

            ' Set RDL file.
            ReportViewer1.LocalReport.ReportPath = "c:\My Reports\Orders.rdlc"

            ' Supply a DataTable corresponding to each report data source.
            Dim myReportDataSource = New ReportDataSource("DataSet1_Orders", LoadOrdersData())
            ReportViewer1.LocalReport.DataSources.Add(myReportDataSource)
        End If

        'Add a handler for drillthrough.
        AddHandler ReportViewer1.LocalReport.SubreportProcessing, AddressOf DemoSubreportProcessingEventHandler

    End Sub

End Class

请参阅

参考

LocalReport 类

Microsoft.Reporting.WebForms 命名空间