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Consult the .NET and SQL Server documentation for complete details of the structure and use of a DiffGram.
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XmlDataDocument Synchronization
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In addition to the XML features presented in Table 16-14, a DataSet can be synchronized with an XmlDataDocument. The utility of this relationship stems from the XmlDataDocument support for Document Object Model (DOM) manipulation as well as XPath queries and XSL Transformations. This provides both relational and hierarchical access to the same underlying data. Changes made through either the DataSet or the XmlDataDocument are immediately reflected in the corresponding view. To synchronize a DataSet with an XmlDataDocument, pass the DataSet instance as an argument to the XmlDataDocument constructor. For example:
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// Assume existing DataAdapter instance called myDataAdapter DataSet myDataSet = new DataSet(); myDataAdapater.Fill(myDataSet); // Create a new XmlDataDocument and synchronize with myDataSet XmlDataDocument myDataDoc = new XmlDataDocument(myDataSet);
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Alternatively, to create a DataSet from the contents of an XmlDataDocument, use the DataSet property. For example:
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// Assume existing XmlDataDocument instance called myDataDoc DataSet myDataSet = myDataDoc.DataSet;
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Consult 11 for details of DOM, XPath, and XSLT support in .NET.
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16. Database Connectivity
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Summary
This chapter has provided an overview of the data access capabilities provided by ADO.NET. The ADO.NET Data Provider architecture provides functionality comparable to that of JDBC. Although the .NET DataReader lacks some of the more advanced functionality of the ResultSet, the consolidation of the Command classes and the use of C# properties and indexers often results in cleaner code, in our opinion. The ADO.NET DataSet offers functionality similar to that of the JDBC RowSet interface. A DataSet can place heavy demands on the memory of a system and can be complex to configure correctly; however, the disconnected data management capabilities and extensive support for XML integration of a DataSet make it a valuable tool to simplify the development of any data-oriented application.
17. Security and Cryptography
17. Security and Cryptography
This chapter details the support for security and cryptography in the Microsoft .NET platform. The support for cryptographic operations and role-based security should be easily understood by experienced Java developers, but the .NET Code Access Security (CAS) model has no direct parallel in Java. Although some of the concepts may seem awkward, the system does offer significant benefits, especially for those programmers who write code to be used by third parties.
Code Access Security
The .NET Framework CAS model is similar to an expanded implementation of the Java security manager. CAS controls access to protected resources (such as the file system) and can be used to prevent applications from performing certain operations (such as opening a network connection or reading a file). We say that CAS is similar to an expanded Java security manager because the .NET Framework provides very fine grain controls for protected resources and the security model is tightly integrated into the runtime model. When a .NET application is started, the common language runtime (CLR) checks to see which permissions should be granted to the code; the CLR will throw a System.Security.SecurityException if an application attempts to perform an operation requiring a permission that has not been granted. The rules determining the set of permissions that should be granted are applied at the assembly level. Each assembly is evaluated individually to determine the policies that should be applied using a technique known as evidence-based security, by which characteristics of an assembly (such as the publisher or source URL) are assessed to determine which permission policies are relevant. The permissions defined by the policies that apply are then granted to the assembly.
Programming for CAS
Programmers aren't required to make explicit use of CAS in code, although there are benefits in doing so, especially for assemblies that are shipped to third parties. The benefits of CAS include the following:
CAS allows administrators to easily assess the security requirements of an assembly, allowing an informed decision to be made when determining the level of trust to grant an application or library. CAS allows programmers to tailor the behavior of an assembly to work within a security policy by requesting optional permissions; for example, a CD player can provide song lists to the user, but only if the security policy allows Internet connections to be made so that the player can look up the CD details. CAS allows programmers to protect their code against subversion; assemblies that never need access to a protected resource can be written to ensure that the code isn't tricked into performing a task that wasn't intended by a programmer.
Ignoring the CAS support doesn't exempt an assembly from security policies; administrators can still apply restrictions to an assembly. Code that has been written without taking CAS into
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