.NET Framework 2.0 Performance Inspection Questions

From Guidance Share

- J.D. Meier, Srinath Vasireddy, Ashish Babbar, Rico Mariani, and Alex Mackman

Contents 1 Common Performance Issues 2 Arrays 3 Asynchronous Processing 4 Class Design Considerations 5 Code Access Security 6 Collections 7 Exception Handling 8 Locking and Synchronization 9 Looping and Recursion 10 Memory Management 11 Ngen.exe 12 Reflection and Late Binding 13 Serialization 14 String Operations 15 Threading 16 Visual Basic Considerations

Common Performance Issues

• Resource cleanup
• Exceptions
• String management
• Threading
• Boxing

Arrays

• Do you use strongly typed arrays?
• Do you use multidimensional arrays?

Asynchronous Processing

• Do you poll for asynchronous invocation resources?
• Do you call EndInvoke after calling BeginInvoke?

Class Design Considerations

• Do you use properties?
• Do you define only the required variables as public?
• Do you seal your classes or methods?

Code Access Security

• Do you use declarative security?
• Do you call unmanaged code?

Collections

• Have you considered arrays?
• Do you enumerate through collections?
• Do you initialize the collection to an approximate final size?
• Do you store value types in a collection?
• Have you considered strongly typed collections?
• Do you use ArrayList?
• Do you use Hashtable?
• Do you use SortedList?

Exception Handling

• Do you catch exceptions you cannot handle?
• Do you control application logic with exception handling?
• Do you use finally blocks to ensure resources are freed?
• Do you use exception handling inside loops?
• Do you re-throw exceptions?

Locking and Synchronization

• Do you use Mutex objects?
• Do you use the Synchronized attribute?
• Do you lock "this"?
• Do you lock the type of an object?
• Do you use ReaderWriterLocks?

Looping and Recursion

• Do you repetitively access properties?
• Do you use recursion?
• Do you use foreach?
• Do you perform expensive operations within your loops?

Memory Management

• Do you manage memory efficiently?
• Do you call GC.Collect?
• Do you use finalizers?
• Do you use unmanaged resources across calls?
• Do you use buffers for I/O operations?

Ngen.exe

• Do you precompile Windows Forms applications?
• Do you create large shared libraries?
• Do you use application domains?

Reflection and Late Binding

• Do you use .NET Framework classes that use reflection?
• Do you use late binding?
• Do you use System.Object to access custom objects?

Serialization

• Do you serialize too much data?
• Do you serialize DataSet objects?
• Do you implement ISerializable?

String Operations

• Do you concatenate strings?
• Do you use StringBuilder?
• Do you perform string comparisons?

Threading

• Do you create additional threads?
• Do you call Thread.Suspend or Thread.Resume?
• Do you use volatile fields?
• Do you execute periodic tasks?

Visual Basic Considerations

• Have you switched off int checking?
• Do you use on error goto?
• Do you turn on Option Strict and Explicit?
• Do you perform lots of string concatenation?