Linq - Interroger une table et retour des résultats en XML

Question

je la structure de tableau suivant:

CREATE TABLE [Report].[MesReport](
    [MesReportID] [int] IDENTITY(1,1) NOT NULL, 
    [ParentID] [int] NOT NULL, 
    [ReportTitle] [nvarchar](80) NOT NULL, 
    [ReportName] [nvarchar](80) NOT NULL, 
    [DatabaseServer] [nvarchar](80) NOT NULL, 
    [DatabaseName] [nvarchar](50) NOT NULL, 
    [Login] [nvarchar](80) NOT NULL, 
    [ReportFile] [varbinary](max) NULL 

Je veux créer une requête Linq qui interrogera ce tableau et de générer le code XML suivant. Quelqu'un peut-il aider avec cela?

<MesReports> 
    <MesReport> 
     <ReportTitle>Mes to Sap Reconciliation Reports</ReportTitle> 
     <ReportName>None</ReportName> 
     <DatabaseServer>None</DatabaseServer> 
     <Database>None</Database> 
     <Login>None</Login> 
     <MesReportId>1</MesReportId> 
     <ParentId>-1</ParentId> 
    </MesReport> 
    <MesReport> 
     <ReportTitle>Finished Goods</ReportTitle> 
     <ReportName>None</ReportName> 
     <DatabaseServer>None</DatabaseServer> 
     <Database>None</Database> 
     <Login>None</Login> 
     <MesReportId>2</MesReportId> 
     <ParentId>1</ParentId> 
    </MesReport> 
    <MesReport> 
     <ReportTitle>Semi-Finished Goods</ReportTitle> 
     <ReportName>None</ReportName> 
     <DatabaseServer>None</DatabaseServer> 
     <Database>None</Database> 
     <Login>None</Login> 
     <MesReportId>3</MesReportId> 
     <ParentId>1</ParentId> 
    </MesReport> 
    <MesReport> 
     <ReportTitle>Warranty Reports</ReportTitle> 
     <ReportName>None</ReportName> 
     <DatabaseServer>None</DatabaseServer> 
     <Database>None</Database> 
     <Login>None</Login> 
     <MesReportId>4</MesReportId> 
     <ParentId>-1</ParentId> 
    </MesReport> 
    <MesReport> 
     <ReportTitle>Box - PBG</ReportTitle> 
     <ReportName>Warranty Box - PBG</ReportName> 
     <DatabaseServer>MyServer</DatabaseServer> 
     <Database>MESProduction</Database> 
     <Login>6QDI+IoQbkZKJpVBcRJcNtoqR62606Q2</Login> 
     <MesReportId>5</MesReportId> 
     <ParentId>4</ParentId> 
    </MesReport> 
    <MesReport> 
     <ReportTitle>Box - FFO</ReportTitle> 
     <ReportName>Warranty Box - FFO</ReportName> 
     <DatabaseServer>MyServer</DatabaseServer> 
     <Database>MESProduction</Database> 
     <Login>6QDI+IoQbkZKJpVBcRJcNtoqR62606Q2</Login> 
     <MesReportId>6</MesReportId> 
     <ParentId>4</ParentId> 
    </MesReport> 
    <MesReport> 
     <ReportTitle>Bin Count - PBG</ReportTitle> 
     <ReportName>Bin Count - PBG</ReportName> 
     <DatabaseServer>MyServer</DatabaseServer> 
     <Database>MESProduction</Database> 
     <Login>6QDI+IoQbkZKJpVBcRJcNtoqR62606Q2</Login> 
     <MesReportId>7</MesReportId> 
     <ParentId>4</ParentId> 
    </MesReport> 
    <MesReport> 
     <ReportTitle>Bin Count - FFO</ReportTitle> 
     <ReportName>Bin Count - FFO</ReportName> 
     <DatabaseServer>MyServer</DatabaseServer> 
     <Database>MESProduction</Database> 
     <Login>6QDI+IoQbkZKJpVBcRJcNtoqR62606Q2</Login> 
     <MesReportId>8</MesReportId> 
     <ParentId>4</ParentId> 
    </MesReport> 
</MesReports> 

Answer 1

L'astuce est ici que vous avez besoin de deux LINQ déclaration séparée, un LINQ to SQL pour lire les données, et un LINQ-à-xml pour l'écrire.

var reportdata = from r in db.MesReport 
//    where r.whatever ...... 
       select r; 

var reportXmlItems = from rx in reportData 
       select new XElement("MesReport", 
        new XElement("ReportTitle", rx.ReportTitle), 
        new XElement("ReportName", rx.ReportName 
        new XElement("DatabaseServer", rx.DatabaseServer 
        new XElement("Database", rx.Database 
        new XElement("Login", rx.Login 
        new XElement("MesReportId", rx.MesReportId 
        new XElement("ParentId", rx.ParentId) 
       ); 

var reportXml = new XElement("MesReports", reportXmlItems);