Shulou(Shulou.com)06/03 Report--

What is the difference between (&, |) and (&, |) in C #? I believe many inexperienced people are at a loss about it. Therefore, this article summarizes the causes and solutions of the problem. Through this article, I hope you can solve this problem.

For (& &, | |), the operation object is a logical value, that is, True/False

& & equivalent to Chinese and, | | equivalent to Chinese or. (called logical operator, also called short-circuit operator)

The result of the operation is only in the following four cases.

True & & True = True (true on the left, true on the right and true returned) if this is a query condition, execute it. True & & False = False (true on the left, false on the right, and return the result false) if this is a query condition, do not execute. False & & True = False (false on the left, short circuit occurs. No more execution on the right, return directly to false). Also do not carry out. False & & False = False (ditto) True | | True = True (true on the left, short circuit occurs, do not execute on the right, return true directly). Execute True | | False = True (true on the left, short circuit occurs, do not execute on the right, return true directly). Execute False | | True = True (false on the left, true on the right and return the result true). Execute False | | False = False (false on the left, false on the right, and return the result false). Do not execute

For (&, |), the object of the operation is the bit, which is called the bit operator.

Understanding: 0 is false,1 and true (generic: 0 means false, and all non-zero numbers represent true. # easy to remember: 0, if nothing is deceived, it will be false) the result of the operation is only the following four cases.

1 & 1 = 11 & 0 = 00 & 1 = 00 & 0 = 01 | 1 = 11 | 0 = 10 | 1 = 10 | 0 = 0

& & and & the result is the same for their respective operands.

The following is a code to illustrate the application of | | in the actual code

Var data = svc.DeclarationHeads.Include ("TaxType") .Where (f = > f.CorporationCode = = param.CorporationCode & & f.FlowSign = = 2 & & (! param.TaxTypeId.HasValue | | f.TaxTypeId = = param.TaxTypeId)) .ToList ()

When TaxTypeId==null is passed in the parameter, param.TaxTypeId.HasValue is true, which causes a short circuit. If it is not executed on the right, the result true is returned.

Then the code is actually executed: var data = svc.DeclarationHeads.Include ("TaxType") .Where (f = > f.CorporationCode = = param.CorporationCode & & f.FlowSign = = 2) .ToList ()

When TaxTypeId==123 is passed in the parameter, param.TaxTypeId.HasValue is false, execute the code on the right, that is, f.TaxTypeId = = 123

Then the code is actually executed: var data = svc.DeclarationHeads.Include ("TaxType") .Where (f = > f.CorporationCode = = param.CorporationCode & & f.FlowSign = = 2 & & f.TaxTypeId = = 123) .ToList ()

Scope of application: when we check the conditions to query or manipulate the database, we can select any number of conditions to query, and only need to call the same method. (that is, a service completes multiple conditional queries) reduces redundant code.

After reading the above, have you mastered the difference between (&, |) and (&, |) in c #? If you want to learn more skills or want to know more about it, you are welcome to follow the industry information channel, thank you for reading!

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.