Microsoft Windows NT 4.0 Guide Manual de usuario descargar pdf (Pagina 138)

Microsoft

Windows Server

™

2003 White Paper

Windows NT 4.0 Server Upgrade Guide 133

Although the runtime provides you with the ability to create side-by-side applications, side-by-side

execution is not automatic. For more information, see Side-by-Side Execution

on the MSDN Web

site and the .NET Framework Software Development Kit Help.

Changes that Affect Backward or Forward Compatibility

A strong effort has been made to ensure that applications compiled against version 1.0 of the

framework can run against version 1.1. Applications compiled against version 1.1 may also work

against 1.0 in some cases, but the primary concern has been to support compatibility from 1.0 to

1.1.

With any new version, some changes may cause an application to behave differently or break.

Some of the main concerns are as follows:

• Change in trust attributes. In version 1.0 and 1.1, applications that receive less than full trust

from the runtime code access security system cannot call shared managed libraries unless the

library writer specifically allows them to through the use of the

AllowPartiallyTrustedCallersAttribute attribute. If you plan on using libraries from partially trusted

code, you need to be aware that some libraries will not be available to your code. In version 1.1,

System.Web.dll, System.Web.Mobile.dll, and System.Web.RegularExpressions.dll are included in

the list of assemblies that have the AllowPartiallyTrustedCallersAttribute and can be called from

partially trusted code.

• Change in default security policy. Default security policy has been changed so that applications

executing from the Internet zone and assigned to the Internet zone code group now receive

permissions associated with the Internet permission set. As a result, applications from the Internet

now receive sufficient permission to execute. In the .NET Framework 1.0 Service Pack 1 (SP1)

and Service Pack 2 (SP2), such applications received the permissions associated with the

Nothing permission set and could not execute.

For more information about these changes, refer to the Help included with the .NET Framework

Software Development Kit.

For a detailed list of all the changes that may affect backward and forward compatibility, see

Backwards Breaking Changes from Version 1.0 to 1.1

on the Got Dot Net Web site, the .NET

Framework community site, at

http://www.gotdotnet.com/team/changeinfo/Backwards1.0to1.1/default.aspx.

Side-by-Side Execution Examples

The following illustration shows several applications using two different versions of the runtime on

the same computer. Applications A, B, and C use runtime version 1.0, while application D uses

runtime version 1.1.

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Microsoft Windows NT 4.0 Guide Manual de usuario Pagina 138