Asp.Net MVC3，Bool Column null检查

Question

public Nullable<bool> BROUGHT { get; set; } // EDMX generate this code, so I can not change this

I want to null check for the BROUHGT (DB) column.

so I write code like

if (table.BROUGHT != DBNull.Value && Convert.ToBoolean(table.BROUGHT)){..}

but the error message say,

Error   2   Operator '!=' cannot be applied to operands of type 'bool?' and 'System.DBNull' ...

How I null check for that column?

Thank you!

Answer 1

Entity Framework is an ORM, and it's shiedling you from having to think about DBNull.Value . So just check against null like you would in other C# code:

if (table.BROUGHT != null && table.BROUGHT.Value){..}

Not that since it's a nullable type, to get the actual bool value you have to either use the .Value property (as above) or cast it to a bool .