水晶报表查看器下一页不工作

Question

我正在使用 Visual Studio 2010 和 Crystal Report 13.0

报表查看器正确显示第一页。但是下一页按钮不起作用。如果我单击下一页按钮，则它会显示加载消息并仅停留在那里。所有报告查看器控件都不起作用。

请帮帮我

Answer 1

我找到了解决方案。 手动添加 Page_Init() 事件并将其连接到 InitializeCompnent() 与

this.Init += new System.EventHandler(this.Page_Init).

将Page_Load的内容移动到Page_Init()。

在PageInIt 中添加if (!IsPostBack) 条件。

protected void Page_Init(object sender, EventArgs e)
{

        if (!IsPostBack)
        {
             ReportDocument crystalReportDocument = new ReportDocumment();
             crystalReportDocument.SetDataSource(DataTableHere);
             _reportViewer.ReportSource = crystalReportDocument;
             Session["ReportDocument"] = crystalReportDocument;
        }
        else
        {
              ReportDocument doc = (ReportDocument)Session["ReportDocument"];
              _reportViewer.ReportSource = doc;
        }
   }

Answer 2

您可以将 CrystalReportViewer AutoDataBind 属性与 DataBinding 事件结合使用，而不是手动识别要绑定的时刻。

自动绑定定义：

    // Summary:
    //     Boolean. Gets or sets whether automatic data binding to a report source is
    //     used. If the value is set to True, the DataBind() method is called after
    //     OnInit() or Page_Init().
    [Category("Data")]
    [DefaultValue(false)]
    [DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]
    public bool AutoDataBind { get; set; }

您可以通过以下方式使用此属性：

在 ASPX 中：

<CR:CrystalReportViewer ID="_reportViewer" runat="server" AutoDataBind="true" OnDataBinding="_reportViewer_DataBinding" />

在 ASPX.CS 中：

protected void _reportViewer_DataBinding(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        ReportDocument crystalReportDocument = new ReportDocumment();
        crystalReportDocument.SetDataSource(DataTableHere);
        _reportViewer.ReportSource = crystalReportDocument;
        Session["ReportDocument"] = crystalReportDocument;
    }
    else
    {
        ReportDocument doc = (ReportDocument)Session["ReportDocument"];
        _reportViewer.ReportSource = doc;
    }
}

Answer 3

完成！将您的页面加载事件转换为页面初始化事件。

Answer 4

 protected void Page_Load(object sender, EventArgs e)
 {
     if (IsPostBack)
     {
           int pageIndex =((CrystalDecisions.Shared.PageRequestContext)  
            CrystalReportViewer1.RequestContext).PageNumber;

           //Bind Report with filter and datasource

           string ControID = GetPostBackControlName(this);
          //get and check Crystal Report Navigation button event after Bind Report

           if (ControID == null)
           {  
              ((CrystalDecisions.Shared.PageRequestContext)
              CrystalReportViewer1.RequestContext).PageNumber = pageIndex;      
            }
      }
 }

 public string GetPostBackControlName(Page Page)
    {
        Control control = null;

        string ctrlname = Page.Request.Params["__EVENTTARGET"];
        if (ctrlname != null && ctrlname != String.Empty)
        {
            control = Page.FindControl(ctrlname);
        }
        else
        {
            string ctrlStr = String.Empty;
            Control c = null;
            foreach (string ctl in Page.Request.Form)
            {
                if (ctl.EndsWith(".x") || ctl.EndsWith(".y"))
                {
                    ctrlStr = ctl.Substring(0, ctl.Length - 2);
                    c = Page.FindControl(ctrlStr);
                }
                else
                {
                    c = Page.FindControl(ctl);
                }
                if (c is System.Web.UI.WebControls.Button ||
                         c is System.Web.UI.WebControls.ImageButton)
                {
                    control = c;
                    break;
                }
            }
        }
        if (control == null)
        {
            return null;
        }
        else
        {
            return control.ID;
        }
    }