使用Linq-to-sql在enql-server中存储枚举

Question

How do you store enums in sql-server using linq-to-sql?

I end up having a lot of conversions to and from int in my code. There has to be a better way. What did I miss?

sqlItem.enumValue = (int)myEnumValue;
...
myEnumValue = (MyEnumType)sqlItem.enumValue

It does not matter if SQL server or LINQ stores the values as strings or ints in the database, I just want to avoid all these typecasts sprinkled all over my code.

Could it be solved by an extension method to my linq-to-sql-classes and if so what would that look like?

Answer 1

You can use a mapping for types from the database from within the DBML editor.

Assuming you're working from within Visual Studio (the order in which these actions are undertaken can get highly irritating, since it auto-deselects your current selection in the editor when opening the properties, and so on):

• open the DBML editor,
• open the "Properties" view/tab
• specify the type in the "Type" field.

In my experience, just inputting the type in the form of <namespace>.<type> is not always successful, I think this is the nuance that @leppie is referring to; for safety, use global::<namespace>.<type> .