Effective C#（第3版）：编写高质量C#代码的50条有效方法（英文版）

本书的作者，也是.NET专家Bill Wanger给出我们50条利用C#优点以及特性来写出健壮的，高效的，易于维护的代码的高效法则。同时，本书也反映出了C#语言愈发高级的特性以及关于它的开发社区。本书同时也给出了大量新颖的方法让你能够写出高效可靠的代码。*的第三版囊括了一些泛型和一些其他的语言集成查询（LINQ），还包括了对异常高级实践这一新的章节。

Bill Wagner是世界上最著名的C#开发者之一，是ECMA C#标准委员会的成员。他是Humanitarian Toolbox的主席，连续11年被授予Mcrosoft Regional Director和.NET MVP荣誉称号，最近刚刚被委派到.NET基础顾问理事会任职。 影印版，无译者……………

Chapter 1 C# Language Idioms .................................................................. 1

Item 1: Prefer Implicitly Typed Local Variables ........................................................... 1

Item 2: Prefer readonly to const ..................................................................................... 7

Item 3: Prefer the is or as Operators to Casts ............................................................... 12

Item 4: Replace string.Format() with Interpolated Strings ........................................... 19

Item 5: Prefer FormattableString for Culture-Specific Strings .................................... 23

Item 6: Avoid String-ly Typed APIs ............................................................................ 26

Item 7: Express Callbacks with Delegates ................................................................... 28

Item 8: Use the Null Conditional Operator for Event Invocations ............................... 31

Item 9: Minimize Boxing and Unboxing ..................................................................... 34

Item 10: Use the new Modifier Only to React to Base Class Updates ......................... 38

Chapter 2 .NET Resource Management .................................................. 43

Item 11: Understand .NET Resource Management ...................................................... 43

Item 12: Prefer Member Initializers to Assignment Statements ................................... 48

Item 13: Use Proper Initialization for Static Class Members ....................................... 51

Item 14: Minimize Duplicate Initialization Logic ........................................................ 53

Item 15: Avoid Creating Unnecessary Objects ............................................................ 61

Item 16: Never Call Virtual Functions in Constructors ................................................ 65

Item 17: Implement the Standard Dispose Pattern ....................................................... 68

Chapter 3 Working with Generics ........................................................... 77

Item 18: Always Define Constraints That Are Minimal and Sufficient ....................... 79

Item 19: Specialize Generic Algorithms Using Runtime Type Checking .................... 85

Item 20: Implement Ordering Relations with IComparable＜T＞ and IComparer＜T＞ .. 92

Item 21: Always Create Generic Classes That Support Disposable Type Parameters . 98

Item 22: Support Generic Covariance and Contravariance ........................................ 101

Item 23: Use Delegates to Define Method Constraints on Type Parameters ............. 107

Item 24: Do Not Create Generic Specialization on Base Classes or Interfaces .......... 112

Item 25: Prefer Generic Methods Unless Type Parameters Are Instance Fields ....... 116

Item 26: Implement Classic Interfaces in Addition to Generic Interfaces ................. 120

Item 27: Augment Minimal Interface Contracts with Extension Methods ................ 126

Item 28: Consider Enhancing Constructed Types with Extension Methods .............. 130

Chapter 4 Working with LINQ .............................................................. 133

Item 29: Prefer Iterator Methods to Returning Collections ........................................ 133

Item 30: Prefer Query Syntax to Loops ...................................................................... 139

Item 31: Create Composable APIs for Sequences ...................................................... 144

Item 32: Decouple Iterations from Actions, Predicates, and Functions ..................... 151

Item 33: Generate Sequence Items as Requested ....................................................... 154

Item 34: Loosen Coupling by Using Function Parameters......................................... 157

Item 35: Never Overload Extension Methods ............................................................ 163

Item 36: Understand How Query Expressions Map to Method Calls ........................ 167

Item 37: Prefer Lazy Evaluation to Eager Evaluation in Queries .............................. 179

Item 38: Prefer Lambda Expressions to Methods ...................................................... 184

Item 39: Avoid Throwing Exceptions in Functions and Actions ............................... 188

Item 40: Distinguish Early from Deferred Execution ................................................ 191

Item 41: Avoid Capturing Expensive Resources ........................................................ 195

Item 42: Distinguish between IEnumerable and IQueryable Data Sources ............... 208

Item 43: Use Single() and First() to Enforce Semantic Expectations on Queries ...... 212

Item 44: Avoid Modifying Bound Variables .............................................................. 215

Chapter 5 Exception Practices ................................................................ 221

Item 45: Use Exceptions to Report Method Contract Failures ................................... 221

Item 46: Utilize using and try/finally for Resource Cleanup...................................... 225

Item 47: Create Complete Application-Specific Exception Classes .......................... 232

Item 48: Prefer the Strong Exception Guarantee ........................................................ 237

Item 49: Prefer Exception Filters to catch and re-throw ............................................ 245

Item 50: Leverage Side Effects in Exception Filters .................................................. 249

Index .......................................................................................................... 253