c# - Error validating exception when using System.Reflection -

we're developing sharepoint webpart sandboxed solution in visual studio 2013 sharepoint online. use external dll library itextsharp reading , writing pdf. having problem when activating our solution.

our error message is:

error validating assembly itextsharp.dll.

this solution references prohibited type system.reflection.bindingflags , cannot used on site collection.

you've answered question already:

this solution references prohibited type system.reflection.bindingflags , cannot used on site collection.

you can't use system.reflection namespace sharepoint online solutions (for part). allowed members system.reflection are:

• getvalue name
• getcustomattributes
• propertytype
• getvalue setvalue

i recommend taking @ microsoft's documentation developing sharepoint online solutions (link) there quite few namespaces available sharepoint development prohibited.

here's microsoft has this:

because multi-tenant environment, when upload sandboxed solution solution gallery, sharepoint online performs further round of validation checks, in addition performed on-premise sharepoint installations. sandboxed solution cannot activated if contains code calling of following namespaces:

and here's list of prohibited namespaces (see documentation exceptions):

• microsoft.sqlserver
• microsoft.win32
• system.data.sql
• system.data.sqlclient
• system.data.sqltypes
• system.io.pipes
• system.io.ports
• system.reflection
• system.runtime.interopservices
• system.runtime.remoting
• system.threading
• array.createinstance()
• system.delegate
• type.gettype(string)
• type.invokemember()