asp net entity framework tutorial

//entity is empty is the database context validates the physical validation varentity = db. Userinfo.where (U = u.mobile = =mobile). FirstOrDefault (); if(Entity! =NULL) {Mobilelogmodel.addmobilelog (Dvid, Dvtype,"User Registration","Mobile is registered","Userinfo-register"); returnJson (result, jsonrequestbehavior.allowget); } Public Static voidAddmobilelog

Entity Framework tutorial -- DBContext, entitydbcontext DBContext: In the previous section "create an object data model", EDM creates a SchoolDBEntities class for us.System. Data. Entity. DbContextThis class. This DbContext is called the context class in EF. Before EF4.1, the context class generated by EDM is derived

would throw an exception because it must match column names:using (varnew schooldbentities ()) { //This wouldthrow an exception var studentname = ctx. Students.sqlquery ("from where studentname='New Student1' "). ToList ();}SQL query for non-entity types:A SQL Query Returning instances of any type, including primitive types, can is created using the SQLQuery method on the database class. For example: usin

Bytes Intent -. NET Framework 3.5 Data Development Guide ASP. NET ArticleWen/YU zhongcheng (welcome and scattered) This article, I wrote a few stories about my website. 1. for the first time, I used the segmented syntax. In the past, the simplified syntax was a word sentiment. I think it is often used by the readers to

: Instantiate DbContext to perform crud operations. 1 2 using (varnew schooldbentities ()) 3 { 4 5 // perform crud operations here: 6 } 7 View Code Get ObjectContext from DbContext: The APIs in DbContext in common tasks are easier to use than the ObjectContext API. Of course you can also get ObjectContext references from DbContext to use some of these methods. Can be done with Iobjectcontextadpter. 1 2 using (varnew schooldbentities ()) 3 { 4

This document is mainly introduced. NET development of two new technologies,. NET Platform Language Integration query technology-LINQ, and ado.net new data access layer design technology ado.net Entity Framework. Ado. NET's LINQ to entity section is based on LINQ, First intr

The ASP. NET Web API displays entity Link-related aspects, apilink Sometimes, when we request an object from the server, we want to return the following format: Links :[Href: http: // localhost: 8901/api/user/diaries/2013-08-17,Rel: "self ",Method: "GET ",IsTemplated: false],CurrentDate: "2013-08-17" First, a Link-related class is abstracted: public class Lin

on. Composite types are used for different purposes.enum Types: enum types are some enumerations that can be used for EF.Associations: The Relationship list contains foreign key relationships between all entities.function Imports: The Functions Import list contains the stored procedures that are mapped and the functions that return table values (functions in the database), and so on. In EF, they are used as functions (functions in a programming class) instead of as

Service:The Object service accesses the primary portal of the database and returns the data that is accessed. It is primarily responsible for specific things, such as getting data from the entity client data provider (its next layer) and converting it to a solid object.Entity Client Data Provider:The primary responsibility of this layer is to translate queries provided by LINQ to Entities or entity SQL int

Previously, we have been able to easily create an MVC4 project. Next, we will add a class library to the project. This class library is used to create EF and plays the role of the Model layer in MVC. First, add the "ADO. NET Object Data Model" (I use the Simplified Chinese version). Although it is easy to build, it takes care of beginners. In this way, EF is created. As mentioned in the previous article, Code First is started through a small Demo. Us

Notes on learning ASP. NET MVC5 framework-ASP. net mvc Routing2. cache of AreaRegistration The registration of Area (mainly the registration of Area-based route ing) is completed through the specific AreaRegistration. When the application is started,

Learning ASP. NET MVC5 framework secrets notes-ASP. net mvc routing (5), mvc5-asp.net2. cache of AreaRegistration The registration of Area (mainly the registration of Area-based route ing) is completed through the specific AreaRegistration. When the application is started,

. net mvc topic Article writing conventions The prerequisite for this article is. NET 3.5, but I will try my best to write it in a program compatible with. NET2.0 SP1. The IDE used in the text is basically C for Visual Studio 2008 (Chinese) Language # However, to facilitate your understanding, there may be some Visual Basic My computer operating system is Windows 2003 std/Windows Vista/Windows 7 I will

/* Rating I believe this is something that many comrades like me working on Enterprise Asp.net are doing or have already done. But in any case, Microsoft cannot stop others. It is also a good thing. People in the province shouted to support enterprise development, but they didn't even have a decent enterprise framework. Not to mention the support of others. It's just another product ...... I hope that this is not the first time you get involved, even

BKJIA exclusive interview] BKJIA development channel has been paying attention to the development of ASP. net mvc Framework, and has launched the ASP. net mvc Framework video tutorial f

. Message); } Else { //logging .... } } } } returnobj; } #endregion } /////////////////////do you have any good ideas, please give a suggestion//[email protected]////////////////// Public classHttprequesthelperwhereT:class,New() { #regionForm conversion to solid model/// ///form conversion to solid m

Lazy Loading:One of the important functions of the Entity Framework is the lazy loading. Lazy loading means delaying the loading of related data, until you specifically request for it. For example, the Student class contains studentaddress as a complex property. So, the context first loads all the students from the database and then it'll load the address of a particular student when We access Studentaddres

Iis/asp.netPipingASP. NET MVCis built onASPplatform based onMVCmode ofWebapplication framework, in-depth understandingASP . NET MVCthe premise is toASPa deep understanding of piping design. BecauseASP . NET Webapplications are mostly hosted inIIS, the next step is to introduce3a majorIISversion to the respectiveWebhow

Learning the secrets of ASP. NET MVC5 framework-How ASP. net mvc runs (III)Controller Activation ASP. net mvc routing system implements route resolution for the current HTTP request thr

Explicit Loading with DBContextEven with lazy loading disabled, it's still possible to lazily load related entities, but it must was done with an Explici T call. Use the Load method of Dbentityentry object to accomplish this.The following code explicitly loads standard of particular Student using the Reference () method of Dbentityentry:using(varContext =Newschooldbentities ()) { //Disable Lazy LoadingContext. configuration.lazyloadingenabled =false; varStudent = ( fromSinchcontext. Studentsw