您是否正在使用Sessions和PostBack，必须将查看器保持在Session中，而使用POSTBACK是唯一方法吗？

这对我有用，很可惜您没有发布所有代码：

受保护的无效Page_Init（对象发送者，EventArgs e）

{

System.Drawing.Printing.PrintDocument pDoc =新的System.Drawing.Printing.PrintDocument（）;

rd =新的CrystalDecisions.CrystalReports.Engine.ReportDocument（）;

CrystalDecisions.CrystalReports.Engine.Database crDatabase;

CrystalDecisions.CrystalReports.Engine.Tables crTables;

CrystalDecisions.Shared.TableLogOnInfo tblogoninfo;

CrystalDecisions.Shared.ConnectionInfo cninfo;

字符串url ="/inetpub/wwwroot/WebSite7VS2015/Reports/test.rpt";

rd.FileName = url;

#region会话

if（Session [" rd"] == null）

{

尝试

{

rd.Load（url，OpenReportMethod.OpenReportByTempCopy）; Session.Add（" rd"，rd）; }

最后

{

//打开数据库连接

//myConnection.Close（）;

}

}

#endregion会话

CrystalReportViewer1.Height = 300;

CrystalReportViewer1.Width = 300;

CrystalReportViewer1.ToolPanelView = CrystalDecisions.Web.ToolPanelViewType.None;

//设置格式导出类型：

int myFOpts =（int）（

CrystalDecisions.Shared.ViewerExportFormats.RptFormat |

CrystalDecisions.Shared.ViewerExportFormats.PdfFormat |

CrystalDecisions.Shared.ViewerExportFormats.RptrFormat |

//CrystalDecisions.Shared.ViewerExportFormats.XLSXFormat |

//CrystalDecisions.Shared.ViewerExportFormats.CsvFormat |

//CrystalDecisions.Shared.ViewerExportFormats.EditableRtfFormat |

//CrystalDecisions.Shared.ViewerExportFormats.ExcelRecordFormat |

//CrystalDecisions.Shared.ViewerExportFormats.RtfFormat |

//CrystalDecisions.Shared.ViewerExportFormats.WordFormat |

CrystalDecisions.Shared.ViewerExportFormats.XmlFormat |

CrystalDecisions.Shared.ViewerExportFormats.ExcelFormat |

//CrystalDecisions.Shared.ViewerExportFormats.AllFormats |

CrystalDecisions.Shared.ViewerExportFormats.ExcelRecordFormat）;

//CrystalDecisions.Shared.ViewerExportFormats.NoFormat）; //不允许出口

//int myFOpts =（int）（CrystalDecisions.Shared.ViewerExportFormats.AllFormats）;

CrystalReportViewer1.AllowedExportFormats = myFOpts;

CrystalReportViewer1.ID =" ReportUsageDetailByArea";

CrystalReportViewer1.ReportSource =会话[" rd"];

CrystalReportViewer1.EnableParameterPrompt = true;

CrystalReportViewer1.HasToggleParameterPanelButton = true;

}

销售人员会向您出售一个案例以寻求支持，只需问问他们。 如果您与之交谈的人不知道告诉他们去询问，那么只有一个案例而无需支持合同。

祝你好运

Don