大家看下面一段代码：必须包含指向 Table 类的完整命名空间路径，使其与 System.Web.UI.WebControls 命名空间的 Table 类区分开来？

Question

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using CrystalDecisions.CrystalReports.Engine;
using CrystalDecisions.Shared;
using System.Web.UI.HtmlControls;public partial class Testreport : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        ConfigrationReports();
        
    }
    private ReportDocument NorthwindCustomersReport;    private void ConfigrationReports()
    {
        ConnectionInfo connectionInfo = new ConnectionInfo();
        connectionInfo.DatabaseName = "Northwind";
        connectionInfo.UserID = "sa";
        connectionInfo.Password = "sasa";
        SetDBLogonForReport(connectionInfo ,NorthwindCustomersReport );        NorthwindCustomersReport = new ReportDocument();
        string reportPath = Server.MapPath("NorthwindCustomers.rpt");
        NorthwindCustomersReport.Load(reportPath);
        CrystalReportViewer1.ReportSource = NorthwindCustomersReport;
    
    }
    private void SetDBLogonForReport(ConnectionInfo connectionInfo,ReportDocument reportDocument)
    {
        //using (CrystalDecisions.CrystalReports.Engine ) 
        Tables tables = reportDocument.Database.Tables;       foreach (CrystalDecisions.CrystalReports.Engine.Table table in tables )
        {
            TableLogOnInfo tableLogonInfo = Table.LogOnInfo;
            TableLogOnInfo.ConnecitonInfo = ConnectionInfo;
            table.ApplyLogOnInfo(tableLogOnInfo);
        }
 
        
    }
   
       }如上必须包含指向 Table 类的完整命名空间路径，使其与 System.Web.UI.WebControls 命名空间的 Table 类区分开来？，怎么做，我是新手，请高手给以指点？我不会区分，具体在哪声明以区分开啊，

Answer 1

错误 1 “Table”是“System.Web.UI.WebControls.Table”和“CrystalDecisions.CrystalReports.Engine.Table”之间的不明确的引用 c:\inetpub\wwwroot\costsites\Testreport.aspx.cs 48 45 http://localhost/costsites/
这是具体 的错误信息，请高手帮忙啊，

Answer 2

CrystalDecisions.CrystalReports.Engine.Table tables = reportDocument.Database.Tables;

Answer 3

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using CrystalDecisions.CrystalReports.Engine;
using CrystalDecisions.Shared;
using System.Web.UI.HtmlControls;    public partial class Testreport : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            ConfigrationReports();        }
        private ReportDocument NorthwindCustomersReport;        private void ConfigrationReports()
        {
            //定义登录数据库的具体内容
            ConnectionInfo connectionInfo = new ConnectionInfo();
            connectionInfo.DatabaseName = "Northwind";
            connectionInfo.UserID = "sa";
            connectionInfo.Password = "sasa";
            //执行登录
            SetDBLogonForReport(connectionInfo, NorthwindCustomersReport);
            //绑定报表到VIEWER中
            NorthwindCustomersReport = new ReportDocument();
            string reportPath = Server.MapPath("NorthwindCustomers.rpt");
            NorthwindCustomersReport.Load(reportPath);
            CrystalReportViewer1.ReportSource = NorthwindCustomersReport;        }
        //列出登录数据库的方法
        private void  SetDBLogonForReport （ConnectionInfo connectionInfo, ReportDocument reportDocument)
        {
           Tables tables = reportDocument.Database.Tables;
            foreach (CrystalDecisions.CrystalReports.Engine.Table  table in tables)
            {
                    
                TableLogOnInfo tableLogonInfo = table.LogOnInfo;
                tableLogonInfo.ConnectionInfo = connectionInfo;
                table.ApplyLogOnInfo(tableLogonInfo);
            }
            
        }
         
           }
更改了，大小写的问题，但是还有错误：
未将对象引用设置到对象的实例。 
说明: 执行当前 Web 请求期间，出现未处理的异常。请检查堆栈跟踪信息，以了解有关该错误以及代码中导致错误的出处的详细信息。 异常详细信息: System.NullReferenceException: 未将对象引用设置到对象的实例。源错误: 
行 46: 
行 47: 
行 48:            Tables tables = reportDocument.Database.Tables;
行 49:             foreach (CrystalDecisions.CrystalReports.Engine.Table  table in tables)
行 50:             {
 源文件: c:\Inetpub\wwwroot\costsites\Testreport.aspx.cs    行: 48 
请大家看看是什么问题？
在SetDBLogonForReport方法中，从 ReportDocument 参数的 Database 属性的 Tables 属性，检索 Tables 实例。 
注意   Tables 是包含 Table 类实例的索引类。我该怎么做才不出错误呢

Answer 4

朋友们，解决了，要将//执行登录
            SetDBLogonForReport(connectionInfo, NorthwindCustomersReport);
放到绑定的下面执行就可以了，呵。多多交流