Question

我正在使用Web Api / AngularJs / Entity Framework 6将Windows窗体应用程序迁移到Web环境。此应用程序具有报告功能，基本上用户从一组报告中选择并创建按日期过滤数据的查询， ID范围和状态。下面显示的方法构建SELECT / WHERE语句并将结果作为绑定到datagridview的数据表返回，因此代码非常通用且灵活。我想将其迁移到EF，我想知道什么是最好的方法...... 1.创建表示每个select语句（正文）的接口和DTO？ 2.我如何将din子句中的where子句标记为EF lambda表达式？这是最好的选择吗？

我对如何以优雅高效的方式处理这项任务持开放态度。

   public DataTable GetReportData(ReportArgs rArgs)
    {
        string strSql = string.Empty;
        string whereClause = string.Format(" WHERE {0} {1}",GetDateRange(rArgs), GetIdRange(rArgs));
        string fechaI = rArgs.MatchesFechaI ? string.Format("'{0}'", rArgs.FechaI.ToShortDateString()) : "NULL";
        string fechaF = rArgs.MatchesFechaF == EnumCompararFecha.igual ? string.Format("'{0}'", rArgs.FechaF.ToShortDateString()) : "NULL";
        try
        {
            switch ((EnumReportes)rArgs.ReportNumber)
            {

                case EnumReports.GainTotal:
                    strSql = string.Format("SELECT Id,DateInitial as [Date Initial], WeightInitial as [Weight Initial], DateFinal AS [Date Final], Weightfinal as [Weight Final], Gainday as Gain FROM RepGainTotal {0} ", whereClause);
                    break;

                    ...

                    case EnumReports.GainByPeriod:
                    // In this case the Where clause is built inside of buildStringGainPeriodo(rArgs)
                    strSql = buildStringGainPeriodo(rArgs);
                    SetRepGainsPeriodo(rArgs, strSql);
                    strSql = strSql + " ORDER BY 2";
                    break;
                case EnumReports.Bulls:
                    strSql = string.Format("SELECT Id,Weight,Date1,Date2,Date3,LastGain,Total as [G. Total],round(WeightHoy,0) as [Weight Hoy]  FROM ANALISIS_CEBA {0} ", whereClause);
                    break;
                case EnumReports.SalesVsbuys:
                    strSql = string.Format("SELECT Id,Date_Sale as [Date Sale],Weight_Sale as [Weight Sale],Precio_kilo as [Precio Kilo]," +
                                           "Date_buy as [Date buy], Kilos_buy as [Weight (c)],cost_kilo as [cost Kilo], " +
                                           "GainDailyWeights as [G/day (Weights)],GainDailyGrams as [G/day (Grams)] " +
                                           " FROM SalesVsbuys {0} ", whereClause);
                    SetRepSalesVsbuys(rArgs, whereClause);
                    break;
                case EnumReports.SalesByPeriod:
                    strSql = string.Format("SELECT * FROM Sales {0} ", whereClause);
                    SetRepSales(rArgs, whereClause);
                    break;
                case EnumReports.BuysByPeriodo:
                    strSql = string.Format("SELECT * FROM buys {0} ", whereClause);
                    SetRepbuys(rArgs, whereClause);
                    break;
                case EnumReports.TasksByPeriod:
                    strSql = string.Format("SELECT Date, Task, TotalFROM RepMovimientos {0} ", whereClause);
                    SetRepMvtos(rArgs, whereClause);
                    break;
                case EnumReports.WeightsByPeriod:
                    strSql = string.Format("SELECT Date, Id, Weight FROM WeightHistory {0} order by Date,ID", whereClause);
                    SetRepPesajes(rArgs, whereClause);
                    break;
        }
    }
}

Answer 1

我找到了一个解决方案：使用EF SqlQuery方法加载代表视图的DTO。所以我仍然获得ad-hoc sql的灵活性，然后我可以使用linq，数据绑定等：

''” string strSql = string.Format（“SELECT InitialDate，etc FROM RepLifetimeGain”）; string whereClause = WhereClauseBuilder.BuildWhereClause（rArgs）;

使用（GlContext gContext = new GlContext（）） { var gvida = await gContext.RepLifetimeGain.SqlQuery（string.Format（“{0} {1}”，strSql，whereClause））。ToListAsync（）;

... }

将Datatable函数迁移到Entity Framework的最佳方法

1 个答案: