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

For me this message was because of misunderstanding for TypeName in Column attribute.

Column Attribute: [Column (string name, Properties:[Order = int],[TypeName = string])

name: Name of a column in a db table.
Order: Order of a column, starting with zero index. (Optional)
TypeName: Data type of a column. (Optional)

This TypeName must be only name of the type and must not include precision or scale or length and any other thing. For example following will cause an error

[Column(TypeName = "nvarchar(600)")]

while below one will work fine however you might want to have specific size of the column and for that one way is to use fluent API

[Column(TypeName = "nvarchar")]