edmx

问题 I work with EF 4 (not with Self-tracking entities currently). I've added some columns (non of them is a key and all of the are nullable) to one of my entities, and got the Number of members in conceptual type does not match with number of members on object side type exception. I've followed the accepted answer here but all I got from that was that this entity does not appear in my edmx anymore. I've re-added it from DB, but I keep getting the same exception. I think the problem is that I've

问题 This is driving me crazy. I am getting error that object doesn't contain definition for DeleteObject. Here is my line of code that produces an error: ctx.Tanks.DeleteObject(Tank); I tried to reference another object from another edmx file that my friend has created and then everything is fine, DeleteObject exists. I don't think I miss any references in my project. And project itself contains edmx file and I used DBContext to create POCOs. Any ideas? 回答1: The DbContext API defines DbSet s not

问题 I'm having a lot of issues with the templates of Visual Studio 2010 SP1 & ADO.NET Entity Framework 4.1 I noticed that other people had these problems, and asked similar questions, but I don't think they gave enough information to make it solve-able. The Problem: ADO.NET Entity Data Model Templates are not appearing whatsoever Screenshot: http://c0848462.cdn.cloudfiles.rackspacecloud.com/f067439f6e8f25d5fd36761fd1efc88a74fd765ff1.png Solution File Microsoft Visual Studio Solution File, Format

问题 I have set of Entities generated according to DB First work flow in EntityFramework. The Entities have in proper names so i decide to change them but when i change the Entity name, the navigation property keeps the pluralization and the singularization of the old name like the following : Two Entities ( SREmp ,SRPic ) SREmp SRPic Id id name content phone note - - - - - - SRPics SREmp Now when i change the names of my entities to ( Employee,EmpPhoto ), the navigation properties didn't change !

问题 When working with an EF4 (edmx) model, we frequently need to process an "Update Model From Database". Commonly, we need to just delete table(s) and let them fully regenerate from the database. The issue at hand is that we have multiple recursive relationships/properties. By default, the "update Model From Database" process creates the property with the object's name and then adds a 1, 2, 3, etc. for each additional relationship. So if I have a table of "companies" where it points to itself

问题 I am nearly sure this was available and working before, but at this site I have a very recent upgrade from VS2010 to VS2012. I find that if I double click an .edmx file, it by default opens in an XML editor. Also, the Enterprise Data Model item template is missing, so I must open the project in VS2010 just to add a new data model. Are there any known issues that could cause this? 回答1: you have to select the Microsoft Web Developer Tools in the VS2012 setup to get EF back. Now I have the

问题 I'm trying to create an EDMX file using VS2013 so I can read/write from a DB2 Database. I go through the same process as creating the EDMX from my SQL tables (Right click on project -> Add New Item -> ADO.NET Entity Data Model -> EF Designer from database -> Not using SQL this time so: new connection -> Change data source) but in the Data Source option, DB2 is not available. I have 2 SQL options and that's it. Data Source So after doing some investigating around here along with some other

问题 in a C# project, using EF Database first I've added a foreign key to a table using SQL server management studio. After that, back to Visual Studio I've updated the model from the database but I couldn't see the "link" (i.e. the line joining the two tables in the .edmx diagram) between the two affected tables. So in the dropdown over the child table I saw this option "Entity key" and when I clicked it the "link" appeared. To be honest, I don't know and I can't understand what it does, cause I

问题 I have 3 entities: BaseUser , AuthenticationUser and User . AuthenticationUser inherit from BaseUser and User inherit from AuthenticationUser . User entity has scalar property of type Binary (photo) so I would like to split the User entity into User and UserPhoto . I did exactly what this nice article sais: http://www.deveducate.com/blog/post/2010/12/14/Entity-Framework-Modeling-Table-Splitting.aspx Here is an image of my edmx: When I validate the edmx I keep getting this error: Error 3033:

问题 currently i create dynamic database using CreateDatabase() method in Entity Framework. it executes sucessfully and it creates database at following path: "c:\Program Files\Microsoft SQL Server\MSSQL10.SQLEXPRESS\MSSQL\DATA" but i want to create database in my application's directory. how to do this? please help me. 回答1: Normally all databases are created on default path configured in SQL Server. Only if you are using SQL Server Express and if you define connection string which specifies