Asp.net LINQ为日志记录生成的SQL

我有这个查询，它的结果实现了

IEnumerable

RoutesEntities routesModel = new RoutesEntities();
LocalesEntities localesModel = new LocalesEntities();

var routesQuery = from rs in routesModel.Routes.ToList()
                  join ls in localesModel.Locales.ToList() 
                  on rs.LocaleID equals ls.LocaleID
                  select new
                  {
                      LocaleID = rs.LocaleID,
                      RouteName = rs.RouteName
                  };

问题：如何从此查询中获取生成的SQL，或者如何将其类型转换为

ObjectQuery

以使用

routesQuery.ToTraceString（）

？可能吗

原因：我想将所有SQL查询记录到DB，但我不想为连接的上下文（表）创建新对象

重要：我最初不能使用

ObjectQuery

，因为毕竟我使用了

ListView.DataSource = routesQuery;
ListView.DataBind() 

而且它可能会导致一个数据源使用不同的上下文（DB表）时出错

那么，我应该如何获得生成的SQL查询呢

---

提前感谢。

您使用两种不同的数据上下文，因此您将对每种数据上下文运行不同的查询，并将结果加入客户端。对于LINQ到SQL上下文，数据库中的查询可以记录为Femaref已经指出的内容。EF仍然需要努力赶上LINQtoSQL，并且不提供日志记录。但是，不会返回查询文本。无法记录客户端中的加入，因为。。。它不存在。它不是SQL查询，而是LINQ到对象的循环

var routesQuery = from rs in routesModel.Routes.ToList() 
                  join ls in localesModel.Locales.ToList()  

设置此查询的方式是将整个Routes表加载到内存中，并将整个Locales表加载到内存中。您的查询（有两个）如下所示：

select fieldlist
from tablename

您应该将这两个查询分离为单独的ObjectQuery实例，并分别记录它们。但除此之外，您可能不应该将表中未过滤的内容读入内存

答案是：

public static EntityConnection setSchema(string[] edmxFiles) 
{
            XNamespace edmxns = "http://schemas.microsoft.com/ado/2007/06/edmx";
            XNamespace edmns = "http://schemas.microsoft.com/ado/2006/04/edm";
            XmlDocument edmxXml = new XmlDocument();
            XmlNamespaceManager nameSpace = new XmlNamespaceManager(edmxXml.NameTable);

            List<XmlReader> ssdlReader = new List<XmlReader>();
            List<XmlReader> csdlReader = new List<XmlReader>();
            List<XmlReader> mslReader = new List<XmlReader>();

            foreach (string edmxFile in edmxFiles)
            {
                edmxXml.Load(edmxFile);
                nameSpace.AddNamespace("edmx", edmxns.NamespaceName);

                XmlNode ssdlNode = edmxXml.SelectSingleNode("//edmx:StorageModels", nameSpace);
                XmlNode csdlNode = edmxXml.SelectSingleNode("//edmx:ConceptualModels", nameSpace);
                XmlNode mslNode = edmxXml.SelectSingleNode("//edmx:Mappings", nameSpace);

                ssdlReader.Add(XmlReader.Create(new StringReader(ssdlNode.InnerXml)));
                csdlReader.Add(XmlReader.Create(new StringReader(csdlNode.InnerXml)));
                mslReader.Add(XmlReader.Create(new StringReader(mslNode.InnerXml)));
            }

            StoreItemCollection storageCollection = new StoreItemCollection(ssdlReader);
            EdmItemCollection edmCollection = new EdmItemCollection(csdlReader);
            StorageMappingItemCollection mappingCollection = new StorageMappingItemCollection(edmCollection, storageCollection, mslReader);

            MetadataWorkspace workSpace = new MetadataWorkspace();
            workSpace.RegisterItemCollection(storageCollection);
            workSpace.RegisterItemCollection(edmCollection);
            workSpace.RegisterItemCollection(mappingCollection);

            SqlConnection metaConnect = new SqlConnection(ConfigurationManager.ConnectionStrings["CustomSqlConnection"].ToString());
            EntityConnection entityConnect = new EntityConnection(workSpace, metaConnect);

            return entityConnect;
}

EntityConnection entityConnection = Connector.setSchema(new string[] {
                Path.GetFullPath(AppDomain.CurrentDomain.BaseDirectory + "/App_Model/RoutesModel.edmx"),
                Path.GetFullPath(AppDomain.CurrentDomain.BaseDirectory + "/App_Model/LocalesModel.edmx")
});

entityConnection.Open();
String queryData = "SELECT rs.RouteID, rs.RouteURL, ls.LocaleName, ls.IsActive, ls.LocaleDescription FROM RoutesEntities.Routes AS rs INNER JOIN LocalesEntities.Locales AS ls ON ls.LocaleID = rs.LocaleID";
EntityCommand queryCommand = new EntityCommand(queryData, entityConnection);
DbDataReader routesReader = queryCommand.ExecuteReader(CommandBehavior.SequentialAccess);

ListView.DataSource = routesReader;
ListView.DataBind();