C＃中的try-catch-ELSE [英] C# try-catch-else

问题描述

这已经窃听我的异常处理在Python来C＃的一件事是，在C＃中似乎没有被指定else子句中的任何方式。例如，在Python我可以写这样的事情（注意，这只是一个例子我不要求什么是读取文件的最好方法。）：

One thing that has bugged me with exception handling coming from Python to C# is that in C# there doesn't appear to be any way of specifying an else clause. For example, in Python I could write something like this (Note, this is just an example. I'm not asking what is the best way to read a file):

try
{
    reader = new StreamReader(path);
}
catch (Exception)
{
    // Uh oh something went wrong with opening the file for reading
}
else
{
    string line = reader.ReadLine();
    char character = line[30];
}

从我在大多数的C＃代码的人会像下面所看到的：

From what I have seen in most C# code people would just write the following:

try
{
    reader = new StreamReader(path);
    string line = reader.ReadLine();
    char character = line[30];
}
catch (Exception)
{
    // Uh oh something went wrong, but where?
}

这个麻烦的是，我不想赶超出范围异常的原因是，在该文件中的第一行可以不包含多于30个字符来。我只想赶有关文件流的读取例外。是否有任何类似的结构，我可以在C＃中使用来实现同样的事情？

The trouble with this is that I don't want to catch out of range exception coming from the fact that the first line in the file may not contain more than 30 characters. I only want to catch exceptions relating to the reading of the file stream. Is there any similar construct I can use in C# to achieve the same thing?

推荐答案

捕捉特定类的异常

try
{
    reader = new StreamReader(path);
    string line = reader.ReadLine();
    char character = line[30];
}
catch (IOException ex)
{
    // Uh oh something went wrong with I/O
}
catch (Exception ex)
{
    // Uh oh something else went wrong
}

的

第二个catch是可选的，当然。

The second catch is optional, of course.

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