switch(expression){casevalue1:// 当 expression 等于 value1 时执行的代码break;casevalue2:// 当 expression 等于 value2 时执行的代码break;default:// 当没有匹配项时执行的代码} 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 2. 执行效率对比 从执行效率的角度来看,if-else和switch的性能可能因使用场景...
1. if-else 两个调用相同的Function,但是参数不同, 通常情况性能下降一半 2 使用Constants 或者Load/Fetch来替代大量的if-elseif实现查找表 lookup table 3 使用多个if语句替代if-elseif以使用少量的ALU来替代分支语句。 4 switch-case优化 1. if-else 两个调用相同的Function,但是参数不同, 通常情况性能下降一半...
The results show that the switch statement is faster to execute than the if-else-if ladder. This is due to the compiler's ability to optimise the switch statement. In the case of the if-else-if ladder, the code must process each if statement in the order determined by the programmer. ...
If vs Switch Caseis one of clarity. It shouldn't make much difference in term of performance.
Expression.SwitchCase Method (Expression, array<Expression[]) Microsoft Silverlight will reach end of support after October 2021. Learn more. Creates a SwitchCase for use in a SwitchExpression. Namespace: System.Linq.Expressions Assembly: System.Core (in System.Core.dll) Syntax VB 複製 'Dec...
Case Study: A Few Packets Are Dropped 2 Minutes After the Multicast Service Is Enabled on a SwitchInvolved Products and Versions S series switches of all versions Networking Description As shown in the figure, a switch is upstream to a multicast server and downstr...
Use of switch case statements as a cleaner, more maintainable way of doing something that you often see done with else/if statements.
'sender' parameter not working with switch/case block? 'SQL server Login Failed for User' error specifically when running windows service 'String was not recognized as a valid DateTime.' 'System.Array' does not contain a definition for 'Select' and no extension method 'Select' 'System.Windows...
statements_if_true case case_condition statements_if_true ... Otherwise_condition Statements_if_true end Explanation: The first two lines “switch_ condition, case_ condition” performs an evaluation of an expression and then make a choice for executing one of several statements. Each of such ch...
ExpressVPN is like many other VPN providers that program their internet kill switch to lock the entire network connection in the case of a failed VPN connection. This means that any program on your computer that wants to access the internet will go through ExpressVPN first. ...