Exploring Caller Info Attributes

Last year, Microsoft announced a simple new feature in C# 5: Caller Info Attributes.  These attributes let you to create methods with optional parameters and tell the compiler to pass the caller’s filepath, line number, or member name instead of the parameter’s default value.  This allows you to create logging methods that automatically know where they’re being called.

When the feature was announced, I wrote a couple of blog posts that delved into some of the corner cases of the new feature.  At the time, there was no public implementation, so they were pure conjecture.

This morning, Microsoft released the beta of Visual Studio 11, which is the first public build supporting these attributes.  Now, I can finally test my theories.  Here are the results:

Although these classes are new to the .Net Framework 4.5, you can still use this feature against older framework versions by creating your own classes in the System.Runtime.CompilerServices namespace.  However, the feature will only work if the code calling the method is compiled with the C# 5 compiler; older compilers will ignore the attributes and simply pass the parameters’ default values.

All of the attributes can only be applied to arguments of types that have standard (not custom) implicit conversions to int or string.  This means that it isn’t practical to overflow [CallerLineNumber] (the compiler ran out of memory first), so I can’t test how that behaves.

Using [CallerMemberName] on field initializers passes the field name, and on static or instances constructors passes the string ".cctor" or ".ctor" (as documented)  In indexers, it passes "Item".

If a class has a constructor that takes only caller info attribute parameters, and you create another class that inherits it and does not declare a constructor (thus implicitly passing optional parameters), it passes the line number and file name of the class keyword in the derived class, but leaves the declared default for the member name (I suspect that’s a bug). 

If you do declare a constructor, it passes the string ".ctor" as the member name for the implicit base() call (just like a normal method call from inside a constructor) and the line number of the beginning of the constructor declaration.  If you actually write a base() call, it passes the line number of the base keyword.

If a call spans multiple lines, [CallerLineNumber] passes the line containing the openning parenthesis.

Delegates are fully supported; if you call a delegate that has an argumented annotated with a caller info attribute, the compiler will insert the correct value, regardless of the method you’re actually calling (which the compiler doesn’t even know).

LINQ query comprehension syntax is not supported at all; if you create a (for example) Select() method that contains a caller info attribute, then call it from a LINQ query (not lambda syntax), the compiler will crash (!).  (they will fix that)

Expression trees do not support optional parameters at all, so that corner case is irrelevant.

Attributes are the most interesting story.  What should happen if you declare a custom attribute that takes parameters with caller info attributes, then apply that attribute in various cases?  This could potentially be very useful, since there is currently no way for an attribute to know what it’s being applied to. (I hadn’t thought of this usage when I wrote the original blog post)

The documentation says that this will work in all cases, and that [CallerMemberName] will pass whatever the attribute is being applied to.  However, in the beta build, this doesn’t always work.

Attributes applied to method arguments or return values do not pass any caller info at all.  Attributes applied to types or generic type arguments do not pass member names (this is very disappointing)

Hopefully, those will be fixed before release.


«Oldest   ‹Older   801 – 864 of 864   Newer›   Newest»

This is one of the most informative blogs which I have seen related to the security of the live/ video on demand. It is helpful in making an informed decision about the most useful method to secure your videos.

Very informative message! There is so much information here that can help any business start a successful social media campaign!
data science training in london

I recently found a lot of useful information on your website, especially on this blog page. Among the many comments on your articles. Thanks for sharing.

Data Analytics Course in Durgapur

A good blog always comes-up with new and exciting information and while reading I feel that this blog really has all those qualities that qualify a blog to be one.
business analytics course in hyderabad

I want to leave a little comment to support and wish you the best of luck.we wish you the best of luck in all your blogging enedevors
data science course delhi

I finally found great post here.I will get back here. I just added your blog to my bookmark sites. thanks.Quality posts is the crucial to invite the visitors to visit the web page, that's what this web page is providing.data science course in rohtak

Pretty good post. I just stumbled upon your blog and wanted to say that I have really enjoyed reading your blog posts. Anyway, I’ll be subscribing to your feed and I hope you post again soon.
data analytics course in hyderabad

Someone Sometimes with visits your blog regularly and recommended it in my experience to read as well.Data Science Course in Dombivli

Two full thumbs up for this magneficent article of yours. I've really enjoyed reading this article today and I think this might be one of the best article that I've read yet. Please, keep this work going on in the same quality. data science course

You re in point of fact a just right webmaster. The website loading speed is amazing. It kind of feels that you're doing any distinctive trick. Moreover, The contents are masterpiece. you have done a fantastic activity on this subject! data scientist course

Amazingly by and large very interesting post. I was looking for such an information and thoroughly enjoyed examining this one.
Keep posting. An obligation of appreciation is all together for sharing.
data science course in gwalior

I truly appreciate just perusing the entirety of your weblogs. Just needed to educate you that you have individuals like me who value your work. Unquestionably an extraordinary post. Caps off to you! The data that you have given is exceptionally useful.data scientist course in bhopal

I want to leave a little comment to support and wish you the best of luck.we wish you the best of luck in all your blogging enedevors
data science training in delhi

Your blog provided us with valuable information to work with. Each & every tips of your post are awesome. Thanks a lot for sharing. Keep blogging,
data science classes in hyderabad

Selenium is the widely used web-based automation testing technology that creates tremendous job opportunities for freshers and experienced candidates. The learning of the Selenium Course in Chennai brings worldwide opportunities to become automation engineers, QA professionals, Selenium Testing Engineer, etc.
Selenium Training in Chennai

I'm really getting a charge out of scrutinizing your exquisitely made articles. Apparently you consume a huge load of energy and time on your blog. I have bookmarked it and I am expecting to scrutinize new articles. Continue to do amazing.best data science course in bhubaneswar

I have read your article; it is very informative and helpful for me. I admire the valuable information you offer in your articles. Thanks for posting it.
data analytics course in hyderabad

Extremely overall quite fascinating post. I was searching for this sort of data and delighted in perusing this one.
Continue posting. A debt of gratitude is in order for sharing.
data science course in kolhapur

This is the first time I visit here. I found such a large number of engaging stuff in your blog, particularly its conversation. From the huge amounts of remarks on your articles, I surmise I am by all accounts not the only one having all the recreation here! Keep doing awesome. I have been important to compose something like this on my site and you have given me a thought. data analyst course malaysia

Hi, This article is probably where I got the most useful information for my research. Do you know of any other websites on this topic?
Data Analytics Course in Jalandhar

Get Data Science Certification from top-ranked universities UTM, Malaysia, and IBM. We provide extensive training for the future-ready workforce.data analytics course in rohtak

It is a subcategory of data analysis. It takes out the hidden patterns from big data. Its main task is to develop models for machine learning that is employed in AI.

Mathematical calculations have made it easy to get critical insight from data. The Self-driving Google car is the most prominent example of machine learning.data science training in varanasi

There are many jobs announced for data scientists every year. To conclude, it is right to say that the future of data science is bright.data science course in trichy

This post is very simple to read and appreciate without leaving any details out. Great work!data science course in chennai

It has made its worth due to the proficiency to find the secret datasets that make sense. Some people think that data science is still a successful career in 2021.data science training in Faridabad

Register for the Data Science training in Bangalore to gain knowledge and skill one needs to master to pursue a successful career in this challenging field. Learn to decipher the valuable insights hidden in data with techniques like Predictive Analysis, Forecasting, Optimization, and Text mining. Avail best-in-class curriculum curated by eminent faculty and industry leaders in the form of cases, videos, and live projects.Data Analytics Course in Durgapur

Get dual certification from IBM and UTM, Malaysia with a single Data Science Course at 360DigiTMG. Enroll now for a successful tomorrow!business analytics course in faridabad

Data Science demand is predicted to grow by 22 percent in the coming three years. Become a successful Data Scientist with 360DigiTMG's Data Science course.business analytics course in gurgaon!

Data science is a field that does not restrict the people to come towards it. Data science is not limited to only one area.
data science training in kanpur

The next time I read a blog, I hope that it doesnt disappoint me as much as this one. I mean, I know it was my choice to read, but I actually thought you have something interesting to say. All I hear is a bunch of whining about something that you could fix if you werent too busy looking for attention.data science course in surat

cool stuff you have and you keep overhaul every one of us data analytics course in pune

This is a good post. This post gives truly quality information. I’m definitely going to look into it. Really very useful tips are provided here. Thank you so much. Keep up the good works artificial intelligence classes in pune

When you start learning the discovery of data insight courses, you will have to develop an understanding of detecting complex behaviors and patterns of data.

data science training in lucknow

Data Analytics is a great field with multiple job opportunities. Start your career right with 360DigiTMG. Enroll today.business analytics course in kolkata

Accelerate your career with Data Analytics Certification. We provide everything you need to reach your mission. data analytics course in chennai

Are you worried that joining in a top-rated Data Science course will burn a hole in your pocket, fret not 360DigiTMG offers Data Science courses that are pocket friendly. Enroll now to learn more about the course and fee details.business analytics course in Durgapur

Data science comprises of various necessary processes. One of the essential things on which data science is centered is the programming languages.data science course in nashik

It would help if you learned programming and other fundamentals of computers that you can use throughout your life in any field you choose.data science course in kolkata

Machine learning is the core part of AI. Machines are trained to perform actions automatically like the friend suggestion on Facebook, the recommendations about a particular product on amazon.data science course in jalandhar

Learn to use analytics tools and techniques to manage and analyze large sets of data from Data Science training institutes in hyderabad. Learn to take on business challenges and solve problems by uncovering valuable insights from data. Learn from the comprehensively designed curriculum by the industry experts and work on live projects to sharpen your skills.data science training in hyderabad

I was learning about attributes of caller from video tutorials and wanted to download them but the download was not starting because of server error. So , with Surfshark coupon code , i bought a VPN so that i can connect to it's server and download the tutorial video on exploring caller attributes.

Learn to use analytics tools and techniques to manage and analyze large sets of data from Data Science training institutes in Bangalore. Learn to take on business challenges and solve problems by uncovering valuable insights from data. Learn from the comprehensively designed curriculum by the industry experts and work on live projects to sharpen your skills.
Data Scientist Course in Bangalore

Learn the fundamentals of Data Science and master the skills to handle epic amounts of data collected by organizations today. Gain expertise in organizing, analyzing, and transforming data to uncover its hidden power. Drive your career forward with a Data Science course in Bangalore and learn to uncover insights to present critical findings using visualization tools. Not only this, avail the best-in-class content delivered by stellar faculty who use a blended approach of theory as well as practical knowledge to ensure all the concepts are crystal clear.

Best Data Science Institute in Bangalore

If you have a statistics background, then R will be an excellent choice for you, and you can learn it quickly and accurately because R is based on statistical concepts.data science training in varanasi

Data science has been a great career for most people, and many struggles to come into this field.
data science course in gurgaon

All things considered I read it yesterday yet I had a few musings about it and today I needed to peruse it again in light of the fact that it is very elegantly composed. data analytics courses malaysia

It has increases the importance of the field. If you have also been attracted by the value of data science and want to learn it, you have to understand the basic courses of data science you need to learn to move successfully in the industry.

data science course in patna

Our Data Science certification training with a unique curriculum and methodology helps you to get placed in top-notch companies. Avail all the benefits and become a champion.data analytics course in nashik

Acquire a firm grounding in the theory of Data Science by signing up for the Data Science courses in Bangalore. Master the relevant skills along with all the essential tools and techniques of Data Science. Get to avail benefits like Flexible timings, Best industry trainers, and a meticulously crafted curriculum with hands-on projects that will give you exposure to a real-world working environment.
Data Scientist Course in Bangalore

Data science is an old term, but the work on this term started after 1940. Many scientists work on this term and publish different bookdata science course in vadodaras.

Very wonderful informative article. I appreciated looking at your article. Very wonderful reveal. I would like to twit this on my followers. Many thanks! .
Data Analytics training in Bangalore

Some are searching for the essential skills that can surely make their career successful in data science.data science training in rourkela

Get Data Science Certification from top-ranked universities UTM, Malaysia, and IBM.
data analytics course in pondicherry

et dual certification from IBM and UTM, Malaysia with a single Data Science Course at 360DigiTMG. Enroll now for a successful tomorrow!business analytics course in faridabad

You really make it look so natural with your exhibition however I see this issue as really something which I figure I could never understand. It appears to be excessively entangled and incredibly expansive for me. data analytics course

You can take admission to one of the top institutes that offer degrees in data science. In this way, you will learn all the requirements of the field under one roof.
data science training in lucknow

Thank you for sharing good content. I found your blog on google search it’s very helpful for me.Buy psychedelics online USA

Thank you quite much for discussing this type of helpful informative article. Will certainly stored and reevaluate your Website.
Data Analytics Course in Bangalore

360DigiTMG offers the best Data Science courses in the market. Join and become a professional Data Scientist.business analytics course in ludhiana

Register for the Data Scientist courses in Bangalore and learn to build your Data Science and Machine learning workflows. Build a portfolio of work to have on your resume with live projects which are supported by an industry-relevant curriculum. Get Access to our learning management system (LMS) that provides you with all the material and assignments that will help you master all the concepts for you to solve any problem related to deciphering the hidden meaning in data.

Data Science Course in Bangalore

But if you do not have a degree, you can join an institute for a degree or learn from the institutes that offer online data science courses.data science training in rourkela

I would like to thank you for the efforts you have made in writing this article.
Best Aviation Academy in Chennai 2022
Aviation Academy in Chennai

«Oldest ‹Older   801 – 864 of 864   Newer› Newest»

Post a Comment