如果从C＃中的try或catch块返回，将会执行finally块如果是这样，返回还是之后？ [英] Will finally blocks be executed if returning from try or catch blocks in C#? If so, before returning or after?

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推荐答案

是的， finally 执行，但流程离开 try 块 - 无论是到达结束，返回还是抛出异常。

Yes, the finally block is executed however the flow leaves the try block - whether by reaching the end, returning, or throwing an exception.

从C＃4规范，第8.10节：

From the C# 4 spec, section 8.10:

当控件离开一个try
时，finally块的语句总是执行声明。这是真的，无论控制转移是由于正常的
执行的结果而发生的，因为执行break，continue，goto或return语句，或者作为
的结果，将异常传播出来尝试语句。

The statements of a finally block are always executed when control leaves a try statement. This is true whether the control transfer occurs as a result of normal execution, as a result of executing a break, continue, goto, or return statement, or as a result of propagating an exception out of the try statement.

（当然，第8.10节还有更多的细节。）

(Section 8.10 has a lot more detail on this, of course.)

请注意，返回值在之前确定为终止块执行，所以如果您这样做：

Note that the return value is determined before the finally block is executed though, so if you did this:

int Test()
{
    int result = 4;
    try
    {
        return result;
    }
    finally
    {
        // Attempt to subvert the result
        result = 1;
    }
}

...值仍然会返回，不是1 - 最终块中的赋值将无效。

... the value 4 will still be returned, not 1 - the assignment in the finally block will have no effect.

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