Crystal Report僅顯示第一頁

Question

我正在使用ASP.NET，SQL和Crystal Report。我已成功生成單頁報告。但是，當報表大小超過一頁以上時，Crystal Report僅顯示首頁數據。當我點擊下一個按鈕時，它顯示「源空或找不到源」，如消息。

Protected Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click 
    Dim rptDoc As New ReportDocument 
    Dim ds As New StudentDataSet 
    Dim sqlCon As SqlConnection 
    Dim dt As New DataTable 
    dt.TableName = "Crystal Report Example" 
    sqlCon = New SqlConnection(myCon) 
    Dim da As New SqlDataAdapter("select * from tblStudent", sqlCon) 
    da.Fill(dt) 
    ds.Tables(0).Merge(dt) 
    rptDoc.Load(Server.MapPath("~\Reports\StudentList.rpt")) 
    rptDoc.SetDataSource(ds) 
    CrystalReportViewer1.ReportSource = rptDoc 

    End Sub 

Answer 1

加載該報告必須在每個回發執行的代碼。
Page_Init是您可以放置​​此代碼的正確位置（Page_Load可能導致一些錯誤）。

嘗試這種變化（對不起，VB的錯誤，我使用C＃）：

Protected Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click 
ButtonClicked = true 
ShowReport() 

Protected void Page_Init(object sender, EventArgs e) 
ShowReport() 

Protected Sub ShowReport() 
Dim rptDoc As New ReportDocument 
Dim ds As New StudentDataSet 
Dim sqlCon As SqlConnection 
Dim dt As New DataTable 
dt.TableName = "Crystal Report Example" 
sqlCon = New SqlConnection(myCon) 
Dim da As New SqlDataAdapter("select * from tblStudent", sqlCon) 
da.Fill(dt) 
ds.Tables(0).Merge(dt) 
rptDoc.Load(Server.MapPath("~\Reports\StudentList.rpt")) 
rptDoc.SetDataSource(ds) 
CrystalReportViewer1.ReportSource = rptDoc 

End Sub 

嘿，這是reccomended關閉的ReportDocument在每一頁上卸載;這可以避免報表計數器上的不受控制的增加，從而停止應用程序

protected void Page_Unload(object sender, EventArgs e) 
{ 
    if (reportDocument != null) 
     reportDocument.Close(); 
}