水晶报表和连接问题答案

【问题标题】：Crystal report and problem with connection水晶报表和连接问题
【发布时间】：2011-02-01 15:05:31
【问题描述】：

这个问题给有 CR 经验的人。

我在设置与 Crystal 报表的连接时遇到问题。我收到了客户的报告。数据库的结构在他和我的服务器上是相同的。但是 server 和 db 的名称不同。他正在使用“命令”来创建报告（在数据库字段中添加命令-> 数据库专家...）。该命令有一些返回数据的功能。我尝试在我的计算机上运行此报告，当我尝试执行 TestConnectivity() 时出现问题。此方法返回 false。我尝试调试，发现应用 ApplyLogOnInfo() 内部对象 RasTable 后有旧的 ConnectionInfo。

我正在使用下一个代码进行设置连接：

            private void ApplyConnection(ReportDocument report, ConnectionInfo connectionInfo)
    {
        ApplyLogOnInfo(report, connectionInfo);
        ApplyLogOnInfoForSubreports(report, connectionInfo);
    }

    private void ApplyLogOnInfo(ReportDocument reportDocument, ConnectionInfo connectionInfo)
    {
        foreach (Table table in reportDocument.Database.Tables)
        {
            table.LogOnInfo.ConnectionInfo.AllowCustomConnection = true;
            TableLogOnInfo tableLogonInfo = table.LogOnInfo;
            tableLogonInfo.ConnectionInfo = connectionInfo;
            table.ApplyLogOnInfo(tableLogonInfo);

            _log.InfoFormat("Table connection state: TableName = {0}, IsConnect = {1}", table.Name, table.TestConnectivity());
        }
    }

    private void ApplyLogOnInfoForSubreports(ReportDocument reportDocument, ConnectionInfo connectionInfo)
    {
        Sections sections = reportDocument.ReportDefinition.Sections;
        foreach (Section section in sections)
        {
            ReportObjects reportObjects = section.ReportObjects;
            foreach (ReportObject reportObject in reportObjects)
            {
                _log.InfoFormat("Type = {0}, Name = {1}",reportObject.Name, reportObject.Kind);
                if (reportObject.Kind == ReportObjectKind.SubreportObject)
                {
                    var subreportObject = (SubreportObject)reportObject;
                    ReportDocument subReportDocument = subreportObject.OpenSubreport(subreportObject.SubreportName);
                    ApplyLogOnInfo(subReportDocument, connectionInfo);
                }
            }
        }
    }

所以我的问题是：

如何设置与 Command 的正确连接？
为什么我不能更改连接？（如果报告是在其他服务器上创建的）。

【问题讨论】：

标签： c# crystal-reports

【解决方案1】：

几年前我曾经面临同样的问题，然后写了一门课。这是课程：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using CrystalDecisions.CrystalReports.Engine;
using CrystalDecisions.Shared;

namespace ReportExportDemo 
{ 
    class Reports 
{ 
    static TableLogOnInfo crTableLogonInfo; 
    static ConnectionInfo crConnectionInfo; 
    static Tables crTables; 
    static Database crDatabase; 

    public static void ReportLogin(ReportDocument crDoc, string Server, string Database, string UserID, string Password) 
    { 
        crConnectionInfo = new ConnectionInfo();
        crConnectionInfo.ServerName = Server;
        crConnectionInfo.DatabaseName = Database;
        crConnectionInfo.UserID = UserID;
        crConnectionInfo.Password = Password;
        crDatabase = crDoc.Database; crTables = crDatabase.Tables;

        foreach (CrystalDecisions.CrystalReports.Engine.Table crTable in crTables)
        { 
            crTableLogonInfo = crTable.LogOnInfo;
            crTableLogonInfo.ConnectionInfo = crConnectionInfo;
            crTable.ApplyLogOnInfo(crTableLogonInfo);
        }
    } 

    public static void ReportLogin(ReportDocument crDoc, string Server, string Database)
    {
        crConnectionInfo = new ConnectionInfo();
        crConnectionInfo.ServerName = Server;
        crConnectionInfo.DatabaseName = Database;
        crConnectionInfo.IntegratedSecurity = true;
        crDatabase = crDoc.Database; crTables = crDatabase.Tables;

        foreach (CrystalDecisions.CrystalReports.Engine.Table crTable in crTables)
        { 
            crTableLogonInfo = crTable.LogOnInfo;
            crTableLogonInfo.ConnectionInfo = crConnectionInfo;
            crTable.ApplyLogOnInfo(crTableLogonInfo);
        }
    }
}
}

如果您想知道如何使用，请在此处阅读更多信息：http://midnightprogrammer.net/post/Passing-Parameters-and-Loading-Crystal-Report-Programmatically.aspx

【讨论】：

【解决方案2】：

您只需要在方法定义中添加ref 字

如下

    private void ApplyConnection(ref ReportDocument report, ConnectionInfo connectionInfo)
{
    ApplyLogOnInfo(report, connectionInfo);
    ApplyLogOnInfoForSubreports(report, connectionInfo);
}

private void ApplyLogOnInfo(ref ReportDocument reportDocument, ConnectionInfo connectionInfo)
{
    foreach (Table table in reportDocument.Database.Tables)
    {
        table.LogOnInfo.ConnectionInfo.AllowCustomConnection = true;
        TableLogOnInfo tableLogonInfo = table.LogOnInfo;
        tableLogonInfo.ConnectionInfo = connectionInfo;
        table.ApplyLogOnInfo(tableLogonInfo);

        _log.InfoFormat("Table connection state: TableName = {0}, IsConnect = {1}", table.Name, table.TestConnectivity());
    }
}

private void ApplyLogOnInfoForSubreports(ref ReportDocument reportDocument, ConnectionInfo connectionInfo)
{
    Sections sections = reportDocument.ReportDefinition.Sections;
    foreach (Section section in sections)
    {
        ReportObjects reportObjects = section.ReportObjects;
        foreach (ReportObject reportObject in reportObjects)
        {
            _log.InfoFormat("Type = {0}, Name = {1}",reportObject.Name, reportObject.Kind);
            if (reportObject.Kind == ReportObjectKind.SubreportObject)
            {
                var subreportObject = (SubreportObject)reportObject;
                ReportDocument subReportDocument = subreportObject.OpenSubreport(subreportObject.SubreportName);
                ApplyLogOnInfo(subReportDocument, connectionInfo);
            }
        }
    }
}

【讨论】：