Question

我在aspx页面上有一个Crystal Report Viewer控件，该页面应该具有内置分页功能。

当我第一次点击“下一页”按钮时，我从第1页移到第2页，但是每隔一次我点击“下一页”，报告就会重新加载到第2页。

Answer 1

问题可能源于在ReportSource事件期间设置Crystal Report Viewer控件的Page_Load。这导致每次页面加载都会覆盖页面调度信息，因此当“页面”应该为2时，“当前页面”会重新设置为1.

作为一种简单的解决方案，您可以将设置ReportSource的代码移动到Page_Init

Answer 2

手动添加Page_Init（）事件并使用

将其连接到InitializeCompnent（）中

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

将Page_Load的内容移至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 3

if (!Page.IsPostBack)
{
  //Write your Report display code 

  crystalRep.Load(Server.MapPath("DueFD.rpt"));
  crystalRep.SetDatabaseLogon(DB_UId, DB_Pass, Serv_Name, DB_Name);
  CrystalReportViewer1.ReportSource = crystalRep;

  // session code
  ReportDocument doc = (ReportDocument)Session["ReportDocument"];
  CrystalReportViewer1.ReportSource = doc;
}
else
{
  ReportDocument doc = (ReportDocument)Session["ReportDocument"];
  CrystalReportViewer1.ReportSource = doc;
}

Answer 4

将报告源放在 Page_Init 而不是Page_Load中并报告参数 Page_Load 我认为它的工作原理可能

Answer 5

对我有用!!

ReportDocument rd = new ReportDocument();

        protected void Page_Load(object sender, EventArgs e)
        {           
            string rptpath = WebConfigurationManager.AppSettings["ReportPath"].Replace("{TID}", Convert.ToString(Session["TID"]));
            rd.Load(rptpath);

            DataTable dtable = TemplateModel.LoadChequeData(Convert.ToString(Session["CID"]));
            rd.SetDataSource(dtable);           
        }

        protected void Page_Init(object sender, EventArgs e)
        {
            CrystalReportViewer1.ReportSource = rd;
        }

Answer 6

我之前在visual studio 2008上遇到过这个问题，安装crystal report基本服务包1解决了问题

Answer 7

我也有这个问题，检查是否有其他WebControl干扰Crystal（回调问题？JavaScript？我不确定）。在我的特定情况下，当放入同一页面时，Dart File Upload和Crystal相处得不好。

Answer 8

我将所有加载报告放在Page_Init而不是Page_Load中。它运作正常。

Answer 9

对我来说，这一点工作正常，直到我从13.0.1升级到13.0.10，所以显然发生了一些变化。

我已经尝试了上述解决方案，但由于我们回发更新报告参数这一事实很复杂，如果您不在页面加载上设置报告参数，则刷新失败。所以截至今天，我还没有在页面加载中没有任何东西的情况下工作。

我怀疑我可能需要添加一些逻辑来检查更改的参数值，并且只有在更改后才刷新报告。

最后我删除了我们的＆＃34;侧栏＆＃34;页面向上/向下链接并使用查看器上的链接。鉴于页面挂钩可以使它工作，我看不出任何办法 - 设置报告参数会重置分页，但不设置它们意味着页面不会加载。

Answer 10

我有一些方法可以分享。我开发了一个简单的CR包装器，可以帮助渲染Crystal Reports。按原样使用此代码。请随意修改，扩展代码的任何部分。下载链接https://1drv.ms/u/s!AlTLBrnU_bLUiaoUxcxNiRCZRQjWng

示例如何使用enter code here实现IDisposable接口的CR包装类来利用包装器。在Page_Init中设置报告源并在Page_Load事件中报告参数并在Page_Unload事件中处理报告文档。
第二种方法使用静态类并在1处呈现报告，最后处理报告文档。报告源应保存到会话变量中。请注意，第二种方法并不适用于高流量Web应用程序，因为使用了静态类。如果两个用户同时运行任何报告，则会发生冲突。

方法1

using System;
using System.Linq;
using CrystalDecisions.Shared;
using System.Configuration;
using System.Web.Configuration;
using WebReports.Models.Helpers.CrystalReports; //Reference to CR wrapper


namespace YourNamespace
{
    public partial class ReportForm : System.Web.UI.Page
    {

        protected string _serverName;
        protected string _databaseName;
        protected string _schemaName;
        protected string _userId;
        protected string _userPassword;
        protected bool _integratedSecurity;
        protected string _databaseType;
        //Wrapper Report Document
        protected CReportDocument _reportDocument;

        /// <summary>
        /// Load report
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        protected void Page_Init(object sender, EventArgs e)
        {
            //Wrapper object
            this._reportDocument = new CReportDocument();

            //These settings should be initialized from i.e. web.config in Page_PreInit

            this._reportDocument.ServerName = this._serverName;
            this._reportDocument.DatabaseName = String.Empty;
            this._reportDocument.SchemaName = this._schemaName;
            this._reportDocument.DatabaseType = CReportDatabaseType.ORACLE;
            this._reportDocument.UserId = this._userId;
            this._reportDocument.UserPassword = this._userPassword;
            this._reportDocument.IntegratedSecurity = false;


            //Get report name from query string. Define Your own method to get report name
            var parReportName = Request.QueryString["reportname"];

            if (String.IsNullOrEmpty(parReportName))
            {
                lblConfigError.Text = "Crystal Report name is not being provided.";
                return;
            }

            //Set Report file
            this._reportDocument.ReportFile = Server.MapPath("~/ReportFiles/") + parReportName;
            //Set Report documant
            this._reportDocument.SetReportDocument();
            //Get Report Document
            crViewer.ReportSource = this._reportDocument.GetReportDocument();

        }

        protected void Page_Load(object sender, EventArgs e)
        {

            CReportParameter reportParameter;

            //Get parameters Your own method to provide report parameters
            var parFimYear = RouteData.Values["par1"];
            var parFimCityCode = RouteData.Values["par2"];

            if (par1 == null || par2 == null)
            {
                lblConfigError.Text = "Crystal Report parameters are not being provided.";
                return;
            }

            //Define Report Parameter
            reportParameter = new CReportParameter();
            reportParameter.ParameterName = "@parYear";
            reportParameter.ParameterValue = parFimYear;
            reportParameter.crParameterValueKind = ParameterValueKind.StringParameter;
            _reportDocument.AddCReportParameter(reportParameter);

            reportParameter = new CReportParameter();
            reportParameter.ParameterName = "@parCityCode";
            reportParameter.ParameterValue = parFimCityCode;
            reportParameter.crParameterValueKind = ParameterValueKind.StringParameter;
            _reportDocument.AddCReportParameter(reportParameter);

            //Set report parameters
            this._reportDocument.SetReportParameters();

        }

        protected void Page_Unload(object sender, EventArgs e)
        {
            this._reportDocument.Dispose();
        }

    }
}

方法2

using System;
using System.Linq;
using CrystalDecisions.Shared;
using System.Configuration;
using System.Web.Configuration;
using CrystalDecisions.CrystalReports.Engine;
using WebReports.Models.Helpers.CrystalReports; //Reference to CR wrapper

namespace YourNamespace
{
    public partial class ReportForm : System.Web.UI.Page
    {

        protected string _serverName;
        protected string _databaseName;
        protected string _schemaName;
        protected string _userId;
        protected string _userPassword;
        protected bool _integratedSecurity;
        protected string _databaseType;

        /// <summary>
        /// Load report
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        protected void Page_Init(object sender, EventArgs e)
        {
            CReportParameter reportParameter;

            //These settings should be initialized from i.e. web.config in Page_PreInit

            if (!IsPostBack)
            {
                if (this._databaseType == CReportDatabaseType.ORACLE.ToString())
                {
                    //static wrapper class
                    CReportDocumentManager.ServerName = this._serverName;
                    CReportDocumentManager.DatabaseName = String.Empty;
                    CReportDocumentManager.SchemaName = this._schemaName;
                    CReportDocumentManager.DatabaseType = CReportDatabaseType.ORACLE;
                    CReportDocumentManager.UserId = this._userId;
                    CReportDocumentManager.UserPassword = this._userPassword;
                    CReportDocumentManager.IntegratedSecurity = false;

                    //Get report name from query string. Define Your own method to get report name
                    var parReportName = Request.QueryString["reportname"];

                    if (String.IsNullOrEmpty(parReportName))
                    {
                        lblConfigError.Text = "Crystal Report name is not being provided.";
                        return;
                    }
                        //get par1. Your own method to provide report parameters. This is from MVC application
                        var par1 = RouteData.Values["par1"];
                        //get par2
                        var par2 = RouteData.Values["par2"];

                        if (par1 == null || par2 == null)
                        {
                            lblConfigError.Text = "Crystal Report parameters are not being provided.";
                            return;
                        }

                        reportParameter = new CReportParameter();
                        reportParameter.ParameterName = "@parYear";
                        reportParameter.ParameterValue = par1;
                        reportParameter.CReportParameterValueKind = ParameterValueKind.StringParameter;
                        CReportDocumentManager.AddCReportParameter(reportParameter);

                        reportParameter = new CReportParameter();
                        reportParameter.ParameterName = "@parCityCode";
                        reportParameter.ParameterValue = par2;
                        reportParameter.CReportParameterValueKind = ParameterValueKind.StringParameter;
                        CReportDocumentManager.AddCReportParameter(reportParameter);



                    CReportDocumentManager.ReportFile = Server.MapPath("~/ReportFiles/") + parReportName;
                    ReportDocument doc = CReportDocumentManager.GetCReportDocument();
                    crViewer.ReportSource = doc;
                    Session[parReportName] = doc;

                }
            }
            else
            {
                var parReportName = Request.QueryString["reportname"];
                ReportDocument doc = (ReportDocument)Session[parReportName];
                crViewer.ReportSource = doc;

            }                
        }

    }
}

Crystal Reports Viewer不会超过第2页

10 个答案: