动态更改Crystal Report的连接

Question

我正在使用CrystalReportViewer和CrystalReportSource在我的应用程序中加载和显示.rpt文件。

我的情况是这样的：

说一个人创造了一个水晶报表我的应用程序之外和数据源设置为数据库A，然后我用.rpt文件在我的应用程序，但我需要它绑定到不同的数据库（与表结构和列名称相同，但使用不同的用户名和密码的不同连接字符串）。我如何在C＃中做到这一点？

目前我使用加载报告：

this.CrystalReportSource1.ReportDocument.Load(reportsSubfolder + report.ReportFileName); 
//it is here that I need to change the connection data of the report. 

Answer 1

我用一个函数类似下面的连接信息，在运行时分配。

private void SetDBLogonForReport(CrystalDecisions.Shared.ConnectionInfo connectionInfo, CrystalDecisions.CrystalReports.Engine.ReportDocument reportDocument) 
{ 
    CrystalDecisions.CrystalReports.Engine.Tables tables = reportDocument.Database.Tables; 

    foreach (CrystalDecisions.CrystalReports.Engine.Table table in tables) 
    { 
     CrystalDecisions.Shared.TableLogOnInfo tableLogonInfo = table.LogOnInfo; 

     tableLogonInfo.ConnectionInfo = connectionInfo; 
     table.ApplyLogOnInfo(tableLogonInfo); 
    } 
} 

您应该能够简单地创建一个新的ConnectionInfo对象提供必要的信息，并把它传递到功能与报表文档一起。希望这可以帮助。

Answer 2

VB代码：

Dim report = New ReportDocument 

    Try 
     'open report 
     report.Load(filename, OpenReportMethod.OpenReportByTempCopy) 

     'do this for each distinct database connection, rather than for table 
     report.SetDatabaseLogon("user", "password", "server", "database") 

    Catch ex As Exception 
     'preserve the stack trace information 
     Throw 

    End Try 

Answer 3

您可以使用下面的代码应用某些连接详细信息在运行时的报告。

请在加载报告rpt文件后使用该方法，并将所需的连接详细信息传递给方法，它将从传递的连接详细信息中获取报告数据。

public static void CrystalReportLogOn(ReportDocument reportParameters, 
              string serverName, 
              string databaseName, 
              string userName, 
              string password) 
    { 
     TableLogOnInfo logOnInfo; 
     ReportDocument subRd; 
     Sections sects; 
     ReportObjects ros; 
     SubreportObject sro; 

     if (reportParameters == null) 
     { 
      throw new ArgumentNullException("reportParameters"); 
     } 

     try 
     { 
      foreach (CrystalDecisions.CrystalReports.Engine.Table t in reportParameters.Database.Tables) 
      { 
       logOnInfo = t.LogOnInfo; 
       logOnInfo.ReportName = reportParameters.Name; 
       logOnInfo.ConnectionInfo.ServerName = serverName; 
       logOnInfo.ConnectionInfo.DatabaseName = databaseName; 
       logOnInfo.ConnectionInfo.UserID = userName; 
       logOnInfo.ConnectionInfo.Password = password; 
       logOnInfo.TableName = t.Name; 
       t.ApplyLogOnInfo(logOnInfo); 
       t.Location = t.Name; 
      } 
     } 
     catch 
     { 
      throw; 
     } 

     sects = reportParameters.ReportDefinition.Sections; 
     foreach (Section sect in sects) 
     { 
      ros = sect.ReportObjects; 
      foreach (ReportObject ro in ros) 
      { 
       if (ro.Kind == ReportObjectKind.SubreportObject) 
       { 
        sro = (SubreportObject)ro; 
        subRd = sro.OpenSubreport(sro.SubreportName); 
        try 
        { 
         foreach (CrystalDecisions.CrystalReports.Engine.Table t in subRd.Database.Tables) 
         { 
          logOnInfo = t.LogOnInfo; 
          logOnInfo.ReportName = reportParameters.Name; 
          logOnInfo.ConnectionInfo.ServerName = serverName; 
          logOnInfo.ConnectionInfo.DatabaseName = databaseName; 
          logOnInfo.ConnectionInfo.UserID = userName; 
          logOnInfo.ConnectionInfo.Password = password; 
          logOnInfo.TableName = t.Name; 
          t.ApplyLogOnInfo(logOnInfo); 
         } 
        } 
        catch 
        { 
         throw; 
        } 
       } 
      } 
     } 
    }