asp.net 的错误处理机制讲解
2024-07-10 12:40:09
供稿：网友
程序健壮性最基本要求就是程序错误的处理与捕捉，在ASP.NET中，错误的处理有和其他编程语言一样的机制，可以使用Try…Catch…Finally等方式，这一点和ASP相比具有较大的进步。而且，使用这些错误处理方法，可以大大提高程序的可读性和程序调试速度，在这几个优势结合的情况下，我们更加应该注意这一点。
关于错误的处理，我们可以参考这篇文章:
Try...Catch...Finally in ASP.NET
Introduction
Error handling in Classic ASP was not the best. We were having only limited options available for error handling in Classic ASP such as, "On Error Resume Next". In ASP 3.0 we saw the new ASP object called Error Object. But we were not able to handle all exception/errors efficiently. Now in ASP.NET we have a new error handling mechanism which was already their in other languages such as C, C++ and JAVA. We can also call the try...catch mechanism as "Exception Handling"
What is Try...Catch....Finally
This is a new error handling mechanism in VB.NET, so as in ASP.NET. Well we have three blocks of code, were each block has it own functionality. The Try...Catch...Finally block of code surrounds the code where an exception might occur. The simple Try statement comes before the block of code, the Catch block of code is where we specify what type of error to look for, and the Finally block of code is always executed and contains cleanup routines for exception situations. Since the catch block is specific to the type of error we want to catch, we will often use multiple Catch blocks in our Try...Catch...Finally structure.
A simple Database operation
Dim mySqlConnection as New SqlConnection (ConnectionString)
Dim mySqlCommand as SqlCommand
Dim strSql as String
strSql = "insert into yourtable (f1, f2) values ('f1', 'f2')"
mySqlCommand = new SqlCommand(strSql, mySqlConnection)
