问题描述
我正在使用Crystl Report XI和WFP查看器在窗口上查看报告。
I am using Crystl Report XI and WFP viewer to view the report on a window.
我正在尝试使用RefreshReport()方法刷新Crystal报表。但是它在 Me.irRapportViewer.ViewerCore.RefreshReport()
行中获得 NULLReferanceException
。
I am trying to refresh my Crystal Report using the RefreshReport() method. But it gets a NULLReferanceException
at the line Me.irRapportViewer.ViewerCore.RefreshReport()
.
如果我删除这一行,报告将被加载,但不是最新的。要获取最新版本,我必须在查看器上单击 Refresh
按钮。这就是为什么我需要从代码中刷新它的原因。
If i remove this line the report gets loaded but its not the latest one. To get the latest one i have to click on the Refresh
button on the viewer. Thats why I need to refresh it from the code.
下面是代码。我找不到我在做什么错。
Bellow is the code. I can't find what I am doing wrong.
Private Sub Window_Loaded(sender As System.Object, e As System.Windows.RoutedEventArgs) Handles MyBase.Loaded
Dim cryRpt As New ReportDocument()
Dim crtableLogoninfos As New TableLogOnInfos()
Dim crtableLogoninfo As New TableLogOnInfo()
Dim crConnectionInfo As New ConnectionInfo()
Dim CrTables As Tables
Dim startupPath As String = Directory.GetParent(Directory.GetCurrentDirectory()).Parent.FullName
cryRpt.Load(startupPath & "\Reports\IrReport2.rpt")
Dim connectionString As String = ConfigurationManager.ConnectionStrings("ReportConnStr").ConnectionString
Dim conn = New SqlConnectionStringBuilder(connectionString)
crConnectionInfo.ServerName = conn.DataSource
crConnectionInfo.DatabaseName = conn.InitialCatalog
crConnectionInfo.UserID = conn.UserID
crConnectionInfo.Password = conn.Password
CrTables = cryRpt.Database.Tables
For Each CrTable As CrystalDecisions.CrystalReports.Engine.Table In CrTables
crtableLogoninfo = CrTable.LogOnInfo
crtableLogoninfo.ConnectionInfo = crConnectionInfo
CrTable.ApplyLogOnInfo(crtableLogoninfo)
Next
Me.irRapportViewer.ViewerCore.ReportSource = cryRpt
Me.irRapportViewer.ViewerCore.ReuseParameterWhenRefresh = True
Me.irRapportViewer.ViewerCore.RefreshReport()
End Sub
XAML如下所示
<Window x:Class="IrRptWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:cr="clr-namespace:SAPBusinessObjects.WPF.Viewer;assembly=SAPBusinessObjects.WPF.Viewer"
Title="IrRptWindow" Height="700" Width="800" WindowStartupLocation="CenterScreen">
<Grid>
<cr:CrystalReportsViewer Name="irRapportViewer" ToggleSidePanel="None"></cr:CrystalReportsViewer>
</Grid>
</Window>
推荐答案
看了几个小时之后,终于想到了为什么而不是尝试刷新 ReportDocument
,而且效果惊人。在将报告设置为查看器之前,我尝试过 cryRpt.Refresh()
。以下是修改后的窗口加载事件的最后三行。
After hours of looking here and there finally I thought why not try refreshing the ReportDocument
and amazingly it works. I tried cryRpt.Refresh()
before setting the report to the viewer. Following are the modified last three lines of my window load event.
cryRpt.Refresh()
Me.irRapportViewer.ViewerCore.ReportSource = cryRpt
'Me.irRapportViewer.ViewerCore.ReuseParameterWhenRefresh = True (No Need)
'Me.irRapportViewer.ViewerCore.RefreshReport() (No Need)
在此答案下,您可以发表评论。
Comments are appreciated under this answer.
这篇关于在WPF中刷新Crystal Report时出现异常的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!