C#异常处理中try和catch语句及finally语句的用法示例

class TestTryCatch
{
  static int GetInt(int[] array, int index)
  {
    try
    {
      return array[index];
    }
    catch (System.IndexOutOfRangeException e) // CS0168
    {
      System.Console.WriteLine(e.Message);
      // Set IndexOutOfRangeException to the new exception's InnerException.
      throw new System.ArgumentOutOfRangeException("index parameter is out of range.", e);
    }
  }
}

static void CodeWithoutCleanup()
{
  System.IO.FileStream file = null;
  System.IO.FileInfo fileInfo = new System.IO.FileInfo("C:\\file.txt");

  file = fileInfo.OpenWrite();
  file.WriteByte(0xF);

  file.Close();
}

static void CodeWithCleanup()
{
  System.IO.FileStream file = null;
  System.IO.FileInfo fileInfo = null;

  try
  {
    fileInfo = new System.IO.FileInfo("C:\\file.txt");

    file = fileInfo.OpenWrite();
    file.WriteByte(0xF);
  }
  catch(System.UnauthorizedAccessException e)
  {
    System.Console.WriteLine(e.Message);
  }
  finally
  {
    if (file != null)
    {
      file.Close();
    }
  }
}