C# 如何强制执行到 Catch 块？
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How Can I Force Execution to the Catch Block?
提问by user983738
I am wondering can try..catchforce execution to go into the catchand run code in there?
我想知道可以try..catch强制执行进入catch并在那里运行代码吗？
here example code:
这里示例代码：
try {
if (AnyConditionTrue) {
// run some code
}
else {
// go catch
}
} catch (Exception) {
// run some code here...
}
采纳答案by cadrell0
Rather than throwing an Exception in the else, I would recommend extracting the code from your catchinto a method and call that from your else
与其在 中抛出异常else，我建议您将代码从您catch的方法中提取到一个方法中，然后从您的 else 中调用它
try
{
if (AnyConditionTrue)
{
MethodWhenTrue();
}
else
{
HandleError();
}
}
catch(Exception ex)
{
HandleError();
}
回答by user983738
try{
if (AnyConditionTrue){
//run some code
}
else{
throw new Exception();
}
}
catch(){
//run some code here...
}
But like Yuck has stated, I wouldn't recommend this. You should take a step back at your design and what you're looking to accomplish. There's a better way to do it (i.e. with normal conditional flow, instead of exception handling).
但就像 Yuck 所说的那样，我不推荐这个。您应该退后一步，了解您的设计以及您希望实现的目标。有一个更好的方法来做到这一点（即使用正常的条件流，而不是异常处理）。
回答by mdm
Yes, if you throwthe exception that you intend to catchfrom within the try, it will be caught in the catch section.
是的，如果您throw打算catch在 try 中处理异常，它将在 catch 部分中捕获。
I have to ask you why you would want to do this though? Exception handling is not meant to be a substitute for control flow.
我不得不问你为什么要这样做？异常处理并不意味着要替代控制流。
回答by juergen d
You could throw an exception to force a catch
您可以抛出异常以强制捕获
throw new Exception(...);
回答by Chuck
why are you catching an exception? Why not just run the code in your "else" block? If you MUST do it that way, just throw a new exception
你为什么要捕捉异常？为什么不直接在“else”块中运行代码？如果你必须这样做，就抛出一个新的异常
throw new Exception();
回答by jug
Yes, you have to throw exception :
是的，你必须抛出异常：
try
{
throw new Exception("hello");
}
catch (Exception)
{
//run some code here...
}
回答by Mark Schultheiss
I think what you want is a finallyblock: http://msdn.microsoft.com/en-us/library/zwc8s4fz(v=vs.80).aspx
我认为你想要的是一个finally块：http: //msdn.microsoft.com/en-us/library/zwc8s4fz(v=vs.80).aspx
see this
看到这个
try
{
doSomething();
}
catch
{
catchSomething();
throw an error
}
finally
{
alwaysDoThis();
}
This is different if/when you do this:
如果/当您这样做时，情况会有所不同：
try
{
doSomething();
}
catch
{
catchSomething();
throw an error
}
alwaysDoThis();// will not run on error (in the catch) condition
the the this last instance, if an error occurs, the catch will execute but NOT the alwaysDoThis();. Of course you can still have multiple catchas always.
最后一个实例，如果发生错误，catch 将执行，但不会执行alwaysDoThis();. 当然，您仍然可以catch像往常一样拥有多个。
回答by Ian
As cadrel said, but pass through an Exception to provide more feedback, which will be shown in the innerException:
正如cadrel所说，但是通过一个Exception来提供更多的反馈，会在innerException中显示：
try
{
if (AnyConditionTrue)
{
MethodWhenTrue();
}
else
{
HandleError(new Exception("AnyCondition is not true"));
}
}
catch (Exception ex)
{
HandleError(ex);
}
...
...
private void HandleError(Exception ex) {
throw new ApplicationException("Failure!", ex);
}
回答by Marinha do Nascimento
if(conditiontrue)
{
}
else{
throw new Exception();
}
回答by Muzafar Hasan
public class CustomException: Exception
{
public CustomException(string message)
: base(message) { }
}
//
//
if(something == anything)
{
throw new CustomException(" custom text message");
}
you can try this
你可以试试这个
