entity-framework-4

问题 I have a project which has an existing database structure and data. Currently project is running on PHP + MySQL and I'm trying to switch from PHP to C# EF 6.0 + MySQL Database first approach. I have installed NuGet Packages (EF 6.0 and MySQL.Data, MySQL.Web, MySQL.Data.Entity, MySQL.Data.Entities) and modified my app.config according to use MySQL data provider. Up to this state everything works perfectly, I can generate model from database and can insert data on each table without any issue

问题 I have a View Model that has some serious nesting. I need to populate it from Entity Framework 4. I tried creating one big linq statement to populate it, but it says it doesn't recognize the .ToList() methods. It compiles fine. Runtime error is LINQ to Entities does not recognize the method 'System.Collections.Generic.List`1[ProductDepartment] ToList[ProductDepartment] (System.Collections.Generic.IEnumerable`1[ProductDepartment])' method, and this method cannot be translated into a store

问题 I have been looking for a solution for days now. I have eight entities in my application, a base and seven entities that inherits from this base entity. Some of the child entities have same properties. public class LogEntry(){ public int LogEntryId{get;set;} public string ... } public class TestEntry : LogEntry{ .... public string SomeProperty{get;set;} //SomePropertyThatIsNotInBaseClass .... } public class XEntry : LogEntry{ .... public string SomeProperty{get; set;} .... } I am trying to

问题 How do I handle sorting in RadGrid (or any other Grid) using EntityDataSource on computed columns ( in EF partial classes eg.: DisplayName { get { retrun this.Name + " " + this.LastName;}} ) ? 回答1: Like this. 来源： https://stackoverflow.com/questions/3165187/sorting-entityframework-computed-columns

问题 I'm having an entity like that: public class Part : Entity { public int Id { get; set; } public string Name { get; set; } public IEnumerable<VersionSection> VersionSections { get { return Sections.Where(s => s is VersionSection).Cast<VersionSection>(); } } public virtual ICollection<Section> Sections { get; set; } public Part() { this.Sections = new List<Section>(); } } I would like to set the default value for the Sections collection very time when I create a new instance of Part following

问题 I am trying to implement search functionality on a list of customers, the functionality is detailed in this tutorial on the Asp.Net site, http://www.asp.net/entity-framework/tutorials/sorting-filtering-and-paging-with-the-entity-framework-in-an-asp-net-mvc-application In my controller i have the following public ViewResult Index(string sortOrder, string searchString) { ViewBag.CustomerNameSortParm = String.IsNullOrEmpty(sortOrder) ? "CustomerName desc" : ""; ViewBag.PrimaryContactNameSortParm

问题 I am trying to implement search functionality on a list of customers, the functionality is detailed in this tutorial on the Asp.Net site, http://www.asp.net/entity-framework/tutorials/sorting-filtering-and-paging-with-the-entity-framework-in-an-asp-net-mvc-application In my controller i have the following public ViewResult Index(string sortOrder, string searchString) { ViewBag.CustomerNameSortParm = String.IsNullOrEmpty(sortOrder) ? "CustomerName desc" : ""; ViewBag.PrimaryContactNameSortParm

问题 How to create Deep Clone from objects returned via Entity Framework ? The source object also have some other collections associated with it. In other words, how to clone an entity returned from Entity Framework ? 回答1: Just like how we deep clone any other objects. You need override the clone on source object and provide a implementation by copying each memberwise. http://msdn.microsoft.com/en-us/library/system.object.memberwiseclone.aspx How do you do a deep copy of an object in .NET (C#

问题 I have generated the data table model using the option "Generate model from database" in the entity framework and now the model contains the IDE generated code of the models. The models are working fine and now I have a problem, because I want to add custom validations to the table fields and the error messages & the field names should be taken from the resource file. The validation should be done in the ajax call. Can anyone help me to add these validations to the automatically generated

问题 I have generated the data table model using the option "Generate model from database" in the entity framework and now the model contains the IDE generated code of the models. The models are working fine and now I have a problem, because I want to add custom validations to the table fields and the error messages & the field names should be taken from the resource file. The validation should be done in the ajax call. Can anyone help me to add these validations to the automatically generated