名称空间“CrystalDecisions.Web”中不存在类型或命名空间名称“CrystalReportViewer”（您是否缺少程序集引用？）

Question

我在asp.net 3.5 a3层应用程序中使用crystal报表时出现以下错误

名称空间“CrystalDecisions.Web”中不存在类型或命名空间名称“CrystalReportViewer”（您是否缺少程序集引用？）

我包含的名称空间是：

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Xml.Linq;
using MorvelNew.Report;
using System.Data.Sql;
using System.Data.SqlClient;
using System.Data.SqlTypes;
using CrystalDecisions.CrystalReports.Engine;
using CrystalDecisions.Web;

Answer 1

1. 右键单击“引用”并选择“添加引用...”
2. 转到“扩展”
3. 找到“CrystalDecisions.Web”

并添加命名空间

Answer 2

在web.config中错过了几个程序集

    <add assembly="CrystalDecisions.ReportAppServer.ClientDoc, Version=10.5.3700.0, Culture=neutral, PublicKeyToken=692fbea5521e1304"/>
    <add assembly="CrystalDecisions.Enterprise.Framework, Version=10.5.3700.0, Culture=neutral, PublicKeyToken=692fbea5521e1304"/>

<add assembly="CrystalDecisions.Web, Version=10.5.3700.0, Culture=neutral, PublicKeyToken=692FBEA5521E1304"/>
<add assembly="CrystalDecisions.Shared, Version=10.5.3700.0, Culture=neutral, PublicKeyToken=692FBEA5521E1304"/>
<add assembly="CrystalDecisions.ReportSource, Version=10.5.3700.0, Culture=neutral, PublicKeyToken=692FBEA5521E1304"/>
<add assembly="CrystalDecisions.CrystalReports.Engine, Version=10.5.3700.0, Culture=neutral, PublicKeyToken=692FBEA5521E1304"/>
    <add assembly="CrystalDecisions.ReportAppServer.ClientDoc, Version=10.5.3700.0, Culture=neutral, PublicKeyToken=692fbea5521e1304"/>
    <add assembly="CrystalDecisions.Enterprise.Framework, Version=10.5.3700.0, Culture=neutral, PublicKeyToken=692fbea5521e1304"/>
    <add assembly="CrystalDecisions.Enterprise.InfoStore, Version=10.5.3700.0, Culture=neutral, PublicKeyToken=692fbea5521e1304"/></assemblies>