2024 Entity framework objectcontext

Entity framework objectcontext

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WebOct 6, 2012 · You cannot use DbContext API until your entities are POCOs (no EntityObject parent). Btw. you can use code only mapping with ObjectContext (and POCOs) without ever using DbContext. You just need to: Create EntityTypeConfiguration or ComplexTypeConfiguration based class for each your POCO entity / complex type … WebMar 7, 2010 · 5. We have a multi-layered Asp.NET Web Forms application. The data layer has a class called DataAccess which impements IDisposable and has an instance of our Entity Framework Object Context as a private field. The class has a number of public methods returning various collections of Entities and will dispose its Object Context …

WebJan 27, 2013 · Right-click on the design surface of the edmx and choose "Add code generation item" and select DbContext Generator from the Add New Item dialog (you may have to look in online templates). This will create a t4 template that generates a DbContext. If you want to keep working with the ObjectContext API, but sometimes want to switch … WebJun 14, 2012 · You'd have to use DbContext, which is a wrapper around ObjectContext with additional methods, added in EF 4.3 4.1(correction thanks to Slauma) as far as I remember - also there's a way to extract the ObjectContext from DbContext when needed: ObjectContext context = ((IObjectContextAdapter)yourDbContext).ObjectContext; … country american cookware

Managing Entity Framework ObjectContext in ASP.NET

WebAug 11, 2013 · I just found that the Enumerable result should be evaluated because the Refresh method gets it as object and doesn't evaluate it.. var context = ((IObjectContextAdapter)myDbContext).ObjectContext; var refreshableObjects = (from entry in context.ObjectStateManager.GetObjectStateEntries( EntityState.Added … WebC# EF5 ObjectContext：如何替换IQueryable<；T>；。使用context.T.Attach（）包含（路径）,c#,entity-framework,reflection,C#,Entity Framework,Reflection,我将EntityFramework5与ObjectContext一起用于一个相对较大且复杂的数据模型。 brett beer recipe

C# SqlBulkCopy在实体框架和经典Ado.net之间的单个事务或批量插入操作下插入多个表_C#_Sql Server_Entity ...

WebMar 13, 2014 · As per ObjectContext class meta data they are as follow: CreateQuery():Creates an System.Data.Objects.ObjectQuery in the current object context by using the specified query string. Returned -> System.Data.Objects.ObjectQuery ExecuteFunction(): Executes a stored procedure … WebAug 23, 2016 · Mapping EF Entity Columns with Translate. I'm using Entity Framework. I am calling a stored procedure that returns multiple data sets. One of the result sets maps to an entity that I have defined an enumeration for, and have defined a string backing property to receive the result and parse out the enumeration. country americain radioWebMar 19, 2011 · Your using clause is disposing of (read: destroying) the MatchGamingEntities db context before the View has a chance to use it. So while you can just enumerate the items before (or as) you pass the Users to the View, a better approach is to drop your use of the using clause and let natural garbage collection do its work after you truly done with it- … country american flag decor

"WebApr 24, 2012 · var parameters = new ObjectParameter[] {new ObjectParameter("FirstName", "Bob")}; return this._repositoryContext.ObjectContext.ExecuteFunction("GetByName", parameters); The stored procedures can also be mapped as function in the context and … " - Entity framework objectcontext

Entity framework objectcontext

C# 为什么SelectMany会执行多个SQL查询而不是单个联接？_C#_Linq_Entity Framework_Entity ...

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WebAug 8, 2016 · the DbContext is a smaller API exposing the most commonly used features of the ObjectContext. In some cases, those features are mirrored in the DbContext API. In other cases, the Entity Framework team has simplified more complex coding by providing us with methods like Find or properties like DbSet.Local. WebNov 5, 2012 · Turns out there's an EntityConnection.StoreConnection property which gets you a connection to the underlying DBMS. So executing "native" SQL is as easy as this: static void ExecuteSql (ObjectContext c, string sql) { var entityConnection = (System.Data.EntityClient.EntityConnection)c.Connection; DbConnection conn = …

WebExecutes a stored procedure or function that is defined in the data source and mapped in the conceptual model, with the specified parameters. Returns a typed ObjectResult . Execute Store Command (String, Object []) Executes an arbitrary command directly against the data source using the existing connection. Web,c#,linq,entity-framework,entity-framework-6,C#,Linq,Entity Framework,Entity Framework 6,我有以下扩展方法： public static decimal? GetValue(this Member member) { return member.Readings.SelectMany(r => r.Measurements).GetLatestValue(); } GetLatestValue是另一个只使用其他LINQ扩展的扩展：OrderBy、Where、Select和First …

WebOct 14, 2024 · With previous version of Entity Framework a model created with the EF Designer would generate a context that derived from ObjectContext and entity classes that derived from EntityObject. Starting with EF4.1 we recommended swapping to a code generation template that generates a context deriving from DbContext and POCO entity … http://duoduokou.com/csharp/50857592833100334411.html

WebC# 实体框架在高容量IIS网站上运行时会失败吗,c#,multithreading,entity-framework,iis,objectcontext,C#,Multithreading,Entity Framework,Iis,Objectcontext,我们一直在尝试分析这一例外情况：消息：错误：对象引用未设置为对象的实例。。 Stacktrace:at System.RuntimeTypeHandle.CreateInstance ...

WebMy application runs on .NET framework 4.7 and I'm using Entity Framework 6.1.3. Currently, my code uses some classes from the namespace System.Data.SqlClient such as SqlParameter. I want to switch to Microsoft.Data.SqlClient. However, I'm not sure if EF6 is compatible with Microsoft.Data.SqlClient. brett beebe dds long beach caWebAug 11, 2014 · 2. 1 is best solution. In NHibernate world is called session-per-request. You can instantiate ObjectContext in BeginRequest and flush/commit it in EndRequest. 1 is better than 3 because you start working with ORM (Entity Framework in your case) when a request arrives. country americana picturesWebC# 实体框架在高容量IIS网站上运行时会失败吗,c#,multithreading,entity-framework,iis,objectcontext,C#,Multithreading,Entity Framework,Iis,Objectcontext,我们一直在尝试分析这一例外情况：消息：错误：对象引用未设置为对象的实例。。 Stacktrace:at System.RuntimeTypeHandle.CreateInstance ... brett behrends century 21 krogman \\u0026 companyWebC# SqlBulkCopy在实体框架和经典Ado.net之间的单个事务或批量插入操作下插入多个表,c#,sql-server,entity-framework,ado.net,C#,Sql Server,Entity Framework,Ado.net,我有两个表需要在应用程序运行时插入。假设我有如下表格 tbl_第一表和tbl_第二表我的问题是数 … country anagram pairs monkey wrenchWebReturns the Entity Framework ObjectContext that is underlying this context. Skip to main content. This browser is no longer supported. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. ... System.Data.Entity.Core.Objects.ObjectContext System.Data.Entity.Infrastructure ... country amish furnitureWebJun 11, 2013 · For MySQL Provider: My SQL connection string formats have a support for setting the default command timeout explicitly. You can find the details here. You can mention a custom default command timeout value in the MySQL connection string like this -. default command timeout=200; Share. country ampWebSep 24, 2013 · How do I "close" a database connection that's been made against my entity model? If I create a new database using the model (see "First Question", first paragraph), then try to delete it (using ObjectContext.DeleteDatabase), I get an "already in use" exception when attempting the second operation. (It's as if the connection, even when … country american girl dolls