entity-framework

问题 I've been wrestling with this a little while and it's starting to look like it may not be possible. I want to Concat() two IQueryable s and then execute the result as a single query. I tried something like this: var query = from x in ... select new { A = ... B = ... C = ... }; var query2 = from y in ... select new { A = ... B = ... C = ... }; var query3 = query.Concat(query2); However, the last line gives me the following error: 'System.Linq.IQueryable' does not contain a definition for

问题 I am using Linq to entities to query the database to get the list of int for further processing. I have two ways to get the list as below: First is: List<int> lstBizIds = new List<int>() { 1, 2, 3, 4, 5 }; List<int> lstProjectIds = context.Projects.Where(x => lstBizIds.Contains(x.businessId)).Select(x => x.projectId).ToList(); Second is: List<int> lstBizIds = new List<int>() { 1, 2, 3, 4, 5 }; List<int> lstProjectIds = context.Projects.Join(lstBizIds, p => p.businessId, u => u, (p, u) => p

问题 Lets say that I have a particular way of deciding whether some strings "match", like this: public bool stringsMatch(string searchFor, string searchIn) { if (string.IsNullOrEmpty(searchFor)) { return true; } return searchIn != null && (searchIn.Trim().ToLower().StartsWith(searchFor.Trim().ToLower()) || searchIn.Contains(" " + searchFor)); } I would like to pull matches out of a database using Linq To Entities and this helper. However, when I try this: IQueryable<Blah> blahs = query.Where(b =>

问题 Lets say that I have a particular way of deciding whether some strings "match", like this: public bool stringsMatch(string searchFor, string searchIn) { if (string.IsNullOrEmpty(searchFor)) { return true; } return searchIn != null && (searchIn.Trim().ToLower().StartsWith(searchFor.Trim().ToLower()) || searchIn.Contains(" " + searchFor)); } I would like to pull matches out of a database using Linq To Entities and this helper. However, when I try this: IQueryable<Blah> blahs = query.Where(b =>

问题 I'm evaluating unit tests using EF6 in combination with http://effort.codeplex.com/ and SQL CE Server (Local DB file) http://www.codeproject.com/Articles/460175/Two-strategies-for-testing-Entity-Framework-Effort was a quite good reference but now I'm stuck. I have 2 test projects (one for Effort and the other for SQL CE). If I'm running both separately everthing's fine. Running both in a row with the ReSharper test runner the last test project always fails. Either System

问题 I'm evaluating unit tests using EF6 in combination with http://effort.codeplex.com/ and SQL CE Server (Local DB file) http://www.codeproject.com/Articles/460175/Two-strategies-for-testing-Entity-Framework-Effort was a quite good reference but now I'm stuck. I have 2 test projects (one for Effort and the other for SQL CE). If I'm running both separately everthing's fine. Running both in a row with the ReSharper test runner the last test project always fails. Either System

问题 I'm evaluating unit tests using EF6 in combination with http://effort.codeplex.com/ and SQL CE Server (Local DB file) http://www.codeproject.com/Articles/460175/Two-strategies-for-testing-Entity-Framework-Effort was a quite good reference but now I'm stuck. I have 2 test projects (one for Effort and the other for SQL CE). If I'm running both separately everthing's fine. Running both in a row with the ReSharper test runner the last test project always fails. Either System

问题 I'm evaluating unit tests using EF6 in combination with http://effort.codeplex.com/ and SQL CE Server (Local DB file) http://www.codeproject.com/Articles/460175/Two-strategies-for-testing-Entity-Framework-Effort was a quite good reference but now I'm stuck. I have 2 test projects (one for Effort and the other for SQL CE). If I'm running both separately everthing's fine. Running both in a row with the ReSharper test runner the last test project always fails. Either System

问题 I'm trying to setup the Entity Framework with SQL Server 2008. I'm using Guids for the keys on my tables. Is there a way to set it up so the keys are automatically generated by the database? I tried setting "RowGuid" to true and also set the column's default value to be "(newid())". Either way the mapped class still needs me to give it a Guid on the C# side. Any ideas? 回答1: Not yet: 17.4.Can I use a server-generated guid as my entity key? Unfortunately, in v1 of the EF this is not supported.

问题 I have searched a few posts, but have come up short. I am using EF6 code first trying to get results from a stored procedure that is already setup in a database. My application is simple, it takes data from two different servers, performs some business logic, and then shows the user. I can use the .edmx file fine, which maps the function in the xml file. When I use Power Tools to show myself the XML file I do not see the function import from my code below so I am either missing a setup or I