How to Repair the System There is no key for Data.Edm.EdmEntityType.

System.InvalidCastException: Unable to cast object of type 'System.Int32' to type 'System.String'

I've been unable to solve this problem. I think the mistake happens when I try to populate a drop-down menu.... IEnumerable<Customer> values = db.Customers.SqlQuery("SELECT * FROM Customer").ToList().Cast<Customer>(); IEnumerable<SelectListItem> items = from value in values select new SelectListItem { Text = value.Customer...

Unable to cast Anonymous Type from 'System.Linq.IQueryable' to 'System.Data.Entity.Core.Objects.ObjectQuery'

The following query worked correctly with EF5 but fails with EF6. I employ CodeFirst and DbContext....EF6 raised an error:...Unable to cast the type 'System.Linq.IQueryable...1[[<>f__AnonymousType5...4[[System.Int32, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089],[System.Int32, mscorlib, Version=4.0.0.0, Culture=neutra...

LINQ to Entities does not recognize the method 'System.String StringConvert(System.Nullable`1[System.Double])

I had the similar issue and discovered that I was utilizing the incorrect kind of SqlFunctions. Verify that the proper namespace was referenced:...using System.Data.Entity.SqlServer; ...but not:...using System.Data.Objects.SqlClient;

Cannot implicitly convert type System.Data.Entity.Core.Objects.ObjectResult to System.Data.Objects.ObjectResult

None of these fixes worked for me when I experienced the bug (I was already utilizing...System.Data.Entity.Core.Objects... Moreover, it was in the...context.tt... , etc)....I finally realized the issue was between the chair and the keyboard. Even though the saved proc ended with a choose, I was attempting to:...MyStoredProc_Result r = dbcontext.MyS...

Error: Cannot implicitly convert type 'System.Data.Entity.DbSet' to 'System.Linq.IQueryable'

I'm attempting to adhere to the tutorial below: Web Forms for ASP.NET How to begin with Web Forms and Visual Studio (URL: ...http://www.asp.net/web-forms/overview/getting-started/getting-started-with-aspnet-45-web-forms/introduction-and-overview...)....Although my project uses different names, the concept is the same. I'm attempting to develop a re...

Update Database using Entity Framework having primary key on multiple Columns

I receive the following error message:...Store update, insert, or delete statement affected an unexpected number of rows (0). Entities may have been modified or deleted since entities were loaded. See ...http://go.microsoft.com/fwlink/?LinkId=472540... for information on understanding and handling optimistic concurrency exceptions....My model has a...

cannot convert from 'System.Data.Objects.ObjectParameter' to 'System.Data.Entity.Core.Objects.ObjectParameter'

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Method not found: 'Void System.Data.Entity.DbModelBuilder.RegisterEntityType(System.Type)'

I use EntityFramework, however occasionally I receive the following Exception:...threw an exception.", inner exception: "Method not found: 'Void System.Data.Entity.DbModelBuilder.RegisterEntityType(System.Type)'. ...Why is this anomaly occurring?...I discovered that this problem occurs when the system anticipates EF 6.1.3, but the referenced EF is ...

The argument types 'Edm.String' and 'Edm.Int32' are incompatible for this operation

You seem to be using the MVC design pattern....I had the same problem because I sent the id parameter as an integer rather than as a "string," as I had specified in my model....Sample:...public class Object { public string id { get; set; } public string property1{ get; set; } public string property2{ get; set; } public string proper...

Cannot convert from system.data.common.dbconnection to system.data,sqlconnection

I'm importing data into a SQL database from an Excel file. I'm use entity framework 6 and MVC 5. Both epplus and sqlbulkcopy are being used by me to import the data into SQL. I'm getting 3 mistakes: ExcelImportDBEntities.Database is number one. Connection 2) Although used as a type, sqlbulkcopy is a namespace. ObjectReader 3....public async System....