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How To Fix Error 3034 Entity Framework
If you have Error 3034 Entity Framework then we strongly recommend that you download and run this (Error 3034 Entity Framework) repair tool.
Symptoms & Summary
Error 3034 Entity Framework and other critical errors can occur when your Windows operating system becomes corrupted. Opening programs will be slower and response times will lag. When you have multiple applications running, you may experience crashes and freezes. There can be numerous causes of this error including excessive startup entries, registry errors, hardware/RAM decline, fragmented files, unnecessary or redundant program installations and so on.
In order to fix your error, it is recommended that you download the 'Error 3034 Entity Framework Repair Tool'. This is an advanced optimization tool that can repair all the problems that are slowing your computer down. You will also dramatically improve the speed of your machine when you address all the problems just mentioned.
Recommended: In order to repair your system and Error 3034 Entity Framework, download and run Reimage. This repair tool will locate, identify, and fix thousands of Windows errors. Your computer should also run faster and smoother after using this software.
File Size 746 KB
Compatible Windows XP, Vista, 7 (32/64 bit), 8 (32/64 bit), 8.1 (32/64 bit) Windows 10 (32/64 bit)
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Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, entity framework error 26 - error locating server/instance specified helping each other. Join them; it only takes a minute: Sign up Problem in mapping fragments in Entity Framework up vote 7 down vote favorite 2 I am using entity framework and I ran into an odd build
error. I am building a forum and I set up a table in the database for "ignores" when people don't like each other they will ignore someone. The table has two columns and together they are the primary keys. PK InitiatingUser PK IgnoredUser When EF maps this table I get this error: Error 7 Error 3034: Problem in mapping fragments starting at lines 1467, 1477:Two entities with possibly different keys are mapped to the same row. Ensure entity framework error 11007 entity type is not mapped these two mapping fragments map both ends of the AssociationSet to the corresponding columns. I opened up the edmx in the xml editor and navigated to the offending lines.
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MVC» Mobile Development» Android Apps» Cordova/PhoneGap» Windows Apps» Xamarin Development» Database Development» Dynamics GP» MDX - entity framework error 2062 MultiDimensional eXpressions» MySQL» NoSQL» Apache Cassandra DB» Apache CouchDB» MongoDB» SSAS – SQL Server Analysis Service» SQL Server Integration Services – SSIS» SQL Server Reporting Services – http://stackoverflow.com/questions/4821606/problem-in-mapping-fragments-in-entity-framework SSRS» Business Intelligence» Portfolio» Clients» Navigation Fixed: Visual Studio Entity Framework Error 3034 Nov132012 In Visual Studio using Entity Framework 5.0, I receive the following error when working with link tables (many-to-many mapping tables): Error 3034: Problem in mapping fragments starting at lines:Two entities with possibly different keys are mapped to the same row. Ensure http://www.acumensoftwaredesign.com/entity-framework/fixed-visual-studio-entity-framework-error-3034-2 these two mapping fragments map both ends of the AssociationSet to the corresponding columns. First, it really helps to clearly understand how Entity Framework handles many to many mapping tables. If a linking table has any fields other than the two linking ID fields, it will cause Entity Framework some trouble, but doesn't cause this error. It is also important to specify the foreign keys so Entity Framework knows what the fields are for. For great detail, see http://weblogs.asp.net/zeeshanhirani/archive/2008/08/21/many-to-many-mappings-in-entity-framework.aspx After a lot of searching and manipulation of Primary Keys (PK) and Foreign Keys (FK) I found that no logical action fixed the problem. Theoretically you could edit the EDMX (XML) file and fix something, but it can be thousands of lines long and very cryptic. You aren't supposed to have to edit the EDMX file - certainly not for an error like this. Again, theoretically you should be able to "Update Model from Database", but it doesn't resolve this problem. Resolution The resolution that seems
ASP.NET Community Standup Forums Help Home/ASP.NET Forums/Data Access/ADO.NET, Entity Framework, LINQ to SQL, NHibernate/How do I get the Entity designer to properly update database changes? How do I get the Entity designer to properly update database changes? [Answered]RSS 3 replies Last post Jul 29, 2010 11:54 AM by cucho ‹ Previous Thread|Next Thread › Print Share Twitter Facebook Email Shortcuts Active Threads Unanswered Threads Unresolved Threads Support Options Advanced Search Reply cucho Member 5 Points 25 Posts How do I get the Entity designer to properly update database changes? Jul 26, 2010 02:18 PM|cucho|LINK I recently encountered an annoying problem, and was wondering how to get around it: I had three tables in my .edmx designer. Two of the tables, A and B, had a 1:many relationship (A:B). The third table, C, had no relationship defined, because I forgot. I added a new many:many relationship from B:C at the database level. I then right clicked and updated my Entity model, and attempted to compile, encountering a 3034 exception: