通过对象和ExportToStream填充Crystal Report数据源

Question

我使用的是VS 2015，Crystal Report也是最新的SQL Server 2012。

我想通过viewmodel类填充Crystal Report数据源并将其导出为PDF

 ReportDocument rptH = new ReportDocument();
 rptH.FileName = Server.MapPath("~/reports/InvoiceReportsSample1.rpt");

 var showInvoices =
               (from ids in context.Invoices
                where ids.InvoiceNumber == "01-04-2017-1"
                select new Invoice_Report_ViewModel()
                {
                    Invoiceid = ids.Invoiceid,
                    InvoiceNumber = ids.InvoiceNumber,
                    CustomerCompanyName = ids.CustomerCompanyName,
                    FirstBlankSpaceForPanel1 = ids.FirstBlankSpaceForPanel1,
                    MainDiscount = ids.MainDiscount,
                    MainTaxes = ids.MainTaxes,
                    MainTotal = ids.MainTotal,
                    TypeOfPortals = ids.TypeOfPortals,
                    TypeOfTickets = ids.TypeOfTickets,
                    SecondBlankSpaceForPanel2 = ids.SecondBlankSpaceForPanel2,
                }).First();

        var showInvoiceDetails = (from ids in context.InvoiceDetailses
                                  where
                                      ids.Invoiceid == showInvoices.Invoiceid
                                  select new InvoiceDetails_Report_ViewModel()
                                  {

                                  }).ToList();
       var querylist = new List<Invoice_Report_ViewModel> { showInvoices };
        rptH.Database.Tables[0].SetDataSource(querylist);
        rptH.Database.Tables[0].SetDataSource(showInvoiceDetails);
        rptH.Refresh();           
        Stream stream = rptH.ExportToStream(CrystalDecisions.Shared.ExportFormatType.PortableDocFormat);
        return File(stream, "application/pdf"); 

请帮助我得到一个错误

数据源登录失败

但是我没有将报表连接到数据库，而且我已经使用.NET对象配置了报表

请帮忙

Answer 1

我假设您正在尝试设置两个数据源。 您需要将它们设置为相关的数据表。 您可以尝试以下类似方法。

 rptH.Database.Tables[0].SetDataSource(querylist);
 rptH.Database.Tables[1].SetDataSource(showInvoiceDetails);

Answer 2

我遇到了此错误，首先您需要创建一个自定义DataTable，其中包含不同表中的字段。

那么您需要添加此代码。ToDatable来自ReportHelper

    //domResult -> List of your View Model
     DataTable dt = ReportHelper.ToDataTable(domResult);
    // LCDraft_Domestic--> Crystal Report
     LCDraft_Domestic rpt = new LCDraft_Domestic();
   //My Data Table
      rpt.Database.Tables["DraftData"].SetDataSource(dt);

为了避免Crystal报表引发的系统可为空的错误，您需要将列表查询转换为DataTable

创建一个静态的类名ReportHelper

 public static class ReportHelper
{



    public static DataTable ToDataTable<T>(this IList<T> items)
    {
        var tb = new DataTable(typeof(T).Name);

        PropertyInfo[] props = typeof(T).GetProperties(BindingFlags.Public | BindingFlags.Instance);

        foreach (PropertyInfo prop in props)
        {
            Type t = GetCoreType(prop.PropertyType);
            tb.Columns.Add(prop.Name, t);
        }

        foreach (T item in items)
        {
            var values = new object[props.Length];

            for (int i = 0; i < props.Length; i++)
            {
                values[i] = props[i].GetValue(item, null);
            }

            tb.Rows.Add(values);
        }

        return tb;
    }

    /// <summary>
    /// Determine of specified type is nullable
    /// </summary>
    public static bool IsNullable(Type type)
    {
        return !type.IsValueType || (type.IsGenericType && type.GetGenericTypeDefinition() == typeof(Nullable<>));
    }

    /// <summary>
    /// Return underlying type if type is Nullable otherwise return the type
    /// </summary>
    public static Type GetCoreType(Type type)
    {
        if (type != null && IsNullable(type))
        {
            if (!type.IsValueType)
            {
                return type;
            }
            else
            {
                return Nullable.GetUnderlyingType(type);
            }
        }
        else
        {
            return type;
        }
    }
    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);
        }
    }
    //No Login
    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);
        }
    }

}