本文精选了Epan和Citi两家公司的C#面试题目，涵盖了IDisposable模式、二进制转换、集合性能、表达式树等知识点，并深入讨论了引用类型与值类型的差异、不可变性、Lambda表达式及反射等核心概念。
当然面试问题不可能这么少，我只是把我觉得有意义和我当时答的不好拿出来
Epan面试：
1.简述IDisposable pattern，how it works?
2. Easiest way to convert 5 to 101 which is binary format?
answer: can use >> operator
3. C# collection complexity performance?
answer: There is a really good website to explain http://geekswithblogs.net/BlackRabbitCoder/archive/2011/06/16/c.net-fundamentals-choosing-the-right-collection-class.aspx
4. Expression tree.
5. Volatile. When and how to use it?
Citi面试：
1. Reference type and value type. Difference? Tell more. string type is reference type? why?
Answer: http://www.albahari.com/valuevsreftypes.aspx
2. immutable and mutable difference? why immutable?
3. What is Lambda expression?
有时候其实经常用，可如果不好好看看一些概念的具体定义的话，面试的时候很吃亏的
4. What is Delegate? definition?
5. int ? int32 ? int64 ? relationship?
6. Object class all the method inside? why we need equals and referenceequals? why we need gethashcode?
7. Reflection definition?
8. Assembly contains?
answer: metadata, resource, IL
9. .Net Garbage collection
10. What is thread safe? how to make it thread safe?
11. How to implement an notification service using WCF?
asnwer: duplex
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