how to generate barcode in c# How to Create Assembly Declarations in C#.NET

Paint QR in C#.NET How to Create Assembly Declarations

How to Create Assembly Declarations
Quick Response Code Generation In Visual C#
Using Barcode creation for VS .NET Control to generate, create Quick Response Code image in Visual Studio .NET applications.
www.OnBarcode.com
Decode QR In C#
Using Barcode decoder for .NET framework Control to read, scan read, scan image in .NET applications.
www.OnBarcode.com
The following code sample shows an assembly that requires CAS read access to the C:\boot.ini file. If security policy does not grant that permission to the assembly, the runtime throws an exception before running the assembly.
Bar Code Generation In C#
Using Barcode creator for .NET framework Control to generate, create bar code image in VS .NET applications.
www.OnBarcode.com
Recognizing Bar Code In C#.NET
Using Barcode reader for Visual Studio .NET Control to read, scan read, scan image in .NET framework applications.
www.OnBarcode.com
' VB Imports System.Security.Permissions <Assembly: FileIOPermissionAttribute(SecurityAction.RequestMinimum, _ Read := "C:\boot.ini")> Module Module1 Sub Main() Console.WriteLine("Hello, World!") End Sub End Module // C# using System.Security.Permissions; [assembly:FileIOPermissionAttribute(SecurityAction.RequestMinimum, Read=@"C:\boot.ini")] namespace DeclarativeExample { class Program { static void Main(string[] args) { Console.WriteLine("Hello, World!"); } } }
Printing QR Code In VS .NET
Using Barcode generation for ASP.NET Control to generate, create QR Code ISO/IEC18004 image in ASP.NET applications.
www.OnBarcode.com
Generate QR Code 2d Barcode In .NET
Using Barcode printer for .NET framework Control to generate, create QR-Code image in .NET applications.
www.OnBarcode.com
NOTE What you say you need and what you really need
QR Code Creation In Visual Basic .NET
Using Barcode drawer for Visual Studio .NET Control to generate, create QR-Code image in Visual Studio .NET applications.
www.OnBarcode.com
USS Code 39 Printer In C#
Using Barcode creator for VS .NET Control to generate, create ANSI/AIM Code 39 image in Visual Studio .NET applications.
www.OnBarcode.com
The sample assembly doesn t actually access the C:\boot.ini file. CAS declarations are completely arbitrary. It s up to you to make sure they re consistent with your application s requirements.
Creating GTIN - 12 In Visual C#.NET
Using Barcode creation for .NET Control to generate, create UPC-A image in .NET applications.
www.OnBarcode.com
Encoding Denso QR Bar Code In Visual C#
Using Barcode maker for VS .NET Control to generate, create QR Code image in Visual Studio .NET applications.
www.OnBarcode.com
11
Matrix 2D Barcode Printer In C#
Using Barcode creator for .NET Control to generate, create 2D Barcode image in Visual Studio .NET applications.
www.OnBarcode.com
Painting OneCode In C#.NET
Using Barcode creation for .NET framework Control to generate, create OneCode image in .NET applications.
www.OnBarcode.com
Application Security
Barcode Generation In Java
Using Barcode generator for BIRT Control to generate, create barcode image in Eclipse BIRT applications.
www.OnBarcode.com
Make QR Code ISO/IEC18004 In Java
Using Barcode generation for Android Control to generate, create QR Code 2d barcode image in Android applications.
www.OnBarcode.com
The preceding examples used SecurityAction.RequestMinimum to cause the .NET Framework runtime to throw an exception if the assembly did not have CAS permissions to read the C:\boot.ini file. This ensures that the assembly will not run unless the runtime provides the required permission, therefore preventing the application from experiencing problems while running. However, throwing the exception does not improve the security of the assembly because it does nothing to restrict the assembly s permissions.
Paint Code128 In Objective-C
Using Barcode creation for iPhone Control to generate, create USS Code 128 image in iPhone applications.
www.OnBarcode.com
Draw Code 39 Full ASCII In Visual Studio .NET
Using Barcode printer for Reporting Service Control to generate, create Code-39 image in Reporting Service applications.
www.OnBarcode.com
Exam Tip
Making Code 128 Code Set B In None
Using Barcode creation for Font Control to generate, create Code 128C image in Font applications.
www.OnBarcode.com
Creating Code-39 In None
Using Barcode encoder for Software Control to generate, create USS Code 39 image in Software applications.
www.OnBarcode.com
For the exam, remember that CAS is significant only for partially trusted assemblies. The runtime completely ignores CAS declarations for fully trusted assemblies.
UCC - 12 Scanner In Java
Using Barcode decoder for Java Control to read, scan read, scan image in Java applications.
www.OnBarcode.com
GS1 128 Creator In None
Using Barcode creation for Software Control to generate, create UCC - 12 image in Software applications.
www.OnBarcode.com
To improve the assembly s security, specify the SecurityAction.RequestOptional or SecurityAction.RequestRefuse enumerations for the permission s Action property. Optionally, you can combine multiple declarations in a single assembly. For example, if you want the runtime to throw an exception if you don t have access to the HKEY_ LOCAL_MACHINE\Software registry key, and you don t want any other CAS permissions (except, of course, the Enable Assembly Execution security permission), you would use the following declarations:
' VB <Assembly: RegistryPermission(SecurityAction.RequestMinimum, _ Read:="HKEY_LOCAL_MACHINE\Software")> <Assembly: UIPermission(SecurityAction.RequestOptional, _ Unrestricted:=True)> <Assembly: RegistryPermission(SecurityAction.RequestOptional, _ Read:="HKEY_LOCAL_MACHINE\Software")> // C# [assembly:RegistryPermission(SecurityAction.RequestMinimum, Read=@"HKEY_LOCAL_MACHINE\Software")] [assembly: UIPermission(SecurityAction.RequestMinimum, Unrestricted = true)] [assembly: RegistryPermission(SecurityAction.RequestOptional, Read=@"HKEY_LOCAL_MACHINE\Software")]
If you use any SecurityAction.RequestOptional declarations and you want to debug your assembly, you must also declare the UIPermission attribute and set the Unrestricted parameter to True, as shown in the second line of the previous example. You can specify either SecurityAction.RequestOptional or SecurityAction.RequestMinimal for the UIPermission attribute. Otherwise, your assembly will not have permission to interact with the debugger. You will be able to run the assembly without a debugger, however.
Lesson 2: Using Declarative Security to Protect Assemblies
You can combine RequestMinimum, RequestOptional, and RequestRefuse, but combining RequestOptional and RequestRefuse might accomplish nothing. After all, RequestOptional refuses all permissions except those explicitly listed. The only case in which you would combine RequestOptional and RequestRefuse is to refuse a subset of the specified RequestOptional permissions. For example, the following declarations would cause the runtime to throw an exception if the assembly did not have CAS printing permissions. The runtime would deny all CAS permissions except printing, opening Windows, and file system access to the C drive. Access to the C:\Windows directory would also be denied.
' VB <Assembly: PrintingPermission(SecurityAction.RequestMinimum)> <Assembly: UIPermission(SecurityAction.RequestOptional, _ Unrestricted:=True)> <Assembly: FileIOPermissionAttribute(SecurityAction.RequestOptional, _ Read:="C:\")> <Assembly: FileIOPermissionAttribute(SecurityAction.RequestRefuse, _ Read:="C:\Windows\")> // C# [assembly: PrintingPermission(SecurityAction.RequestMinimum)] [assembly: UIPermission(SecurityAction.RequestMinimum, Unrestricted = true)] [assembly: FileIOPermissionAttribute(SecurityAction.RequestOptional, Read = @"C:\")] [assembly: FileIOPermissionAttribute(SecurityAction.RequestRefuse, Read = @"C:\Windows\")]
If you use any SecurityAction.RequestOptional declarations, you must also declare the UIPermission attribute and set the Unrestricted parameter to True to be able to run the assembly with a debugger, as shown in the second line of the previous example. Otherwise, your assembly will not have permission to communicate with the debugger.
BEST PRACTICES Use SecurityAction.RequestOptional assembly declarations
There are whole books about writing secure code, and you should always follow secure coding best practices. We re just human, though. Sometimes, you might simply forget to validate an input or to use strong typing. Other times, you might be rushing to finish a project and just get careless. Using SecurityAction.RequestOptional assembly declarations is the one security best practice that you should always follow. These declarations take very little time to write because it s just a couple lines of code, they re easy to debug because the runtime will throw an easily identifiable exception, and they offer protection for every line of code in your assembly. As an assembly grows in size, this projection decreases some, so you should use method declarations, as discussed in Lesson 3.
Copyright © OnBarcode.com . All rights reserved.