Sequence contains no matching element - EntityFramework

Question

I\'m using EF 6.1.0 and was creating a WCF Service.

First I created a Class Library containing my entities, Mappers and Context for initializing EF. I\'ve also creat

Answer 1

Entity Framework throws this exception if the column type is invalid. For example:

// This will throw an error. There is no such type name.
[Column(TypeName = "Invalid")]
public string Column1 { get; set; }

// Works.
[Column(TypeName = "varchar")]
public string Column1 { get; set; }

See these examples:

• Example 1
• Example 2
• Other examples in comments.