2006-12-10 10:10:59

asp.net优化(二)

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Do not rely on exceptions in your code: Exceptions are very expensive and should rarely occur in your code. You should never use exceptions as a way to control normal program flow. If it is possible to detect in code a condition that would cause an exception, you should do that instead of waiting to catch the exception before handling that condition. Common scenarios include checking for null, assigning to a string that will be parsed into a numeric value, or checking for specific values before applying math operations. For example:

// Consider changing this:try {   result = 100 / num;}catch (Exception e) {  result = 0;}// To this:if (num != 0)   result = 100 / num;else  result = 0;

' Consider changing this:Try   result = 100 / numCatch (e As Exception)  result = 0End Try// To this:If Not (num = 0)   result = 100 / numElse  result = 0End If

// Consider changing this:try {   result = 100 / num;}catch (e:Exception) {  result = 0;}// To this:if (num != 0)   result = 100 / num;else  result

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