How Much Does .NET Reflection Impact Performance?

Performance Impact Analysis of .NET Reflection

Reflection in the .NET framework is powerful, allowing developers to inspect and manipulate types, methods, and properties at runtime. However, its use may affect performance.

Performance cost of reflection

Empirical evidence shows that reflections can significantly impact performance. Jeff Richter's research found that calling methods using reflection is approximately 1,000 times slower than using the conventional method calling mechanism.

Minimize performance impact

To minimize the performance impact of reflection, consider using delegates to cache results. If you need to call a method repeatedly, you can use reflection to get the method once and assign it to the delegate. After that, call the delegate instead of using reflection for every call. This approach optimizes performance by eliminating the overhead associated with runtime reflection.

Example

<code>// 使用委托优化的代码:
Type getType = typeof(MyClass);
MethodInfo method = getType.GetMethod("MyMethod");
Delegate myDelegate = (Delegate)Delegate.CreateDelegate(
    typeof(Delegate), method);
myDelegate.Invoke(new object[] { });</code>

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