为什么这个IF语句失败了？

Question

如果变量path为空editor.Text且不为空,则应显示SaveFileDialog.

现在,为什么这个该死的东西失败了？

我尝试了许多不同的代码变体,结果相同:失败:

if(path.Length >= 1) // path contains a path. Save changes instead of creating NEW file.
{
   File.WriteAllText(path, content);
}
else
{
   // no path defined. Create new file and write to it.
   using(SaveFileDialog saver = new SaveFileDialog())
   {
      if(saver.ShowDialog() == DialogButtons.OK)
      {
         File.WriteAllText(saver.Filename, content);
      }
   }
}

在代码文件的顶部我有:

path = String.Empty;

那么为什么即使在尝试了以下所有变化后,每次都会失败呢？

if(path.Length > 1) // path contains a path. Save changes instead of creating NEW file.
{
   File.WriteAllText(path, content);
}
else
{
   // no path defined. Create new file and write to it.
   using(SaveFileDialog saver = new SaveFileDialog())
   {
      if(saver.ShowDialog() == DialogButtons.OK)
      {
         File.WriteAllText(saver.Filename, content);
      }
   }
}

和

if(String.IsNullOrEmpty(path)) // path contains a path. Save changes instead of creating NEW file.
{
   File.WriteAllText(path, content);
}
else
{
   // no path defined. Create new file and write to it.
   using(SaveFileDialog saver = new SaveFileDialog())
   {
      if(saver.ShowDialog() == DialogButtons.OK)
      {
         File.WriteAllText(saver.Filename, content);
      }
   }
}

和

if(String.IsNullOrWhiteSpace(path)) // path contains a path. Save changes instead of creating NEW file.
{
   File.WriteAllText(path, content);
}
else
{
   // no path defined. Create new file and write to it.
   using(SaveFileDialog saver = new SaveFileDialog())
   {
      if(saver.ShowDialog() == DialogButtons.OK)
      {
         File.WriteAllText(saver.Filename, content);
      }
   }
}

这让我非常生气.怎么会失败？

设置断点显示肯定path是/ . null""

Answer 1

你为什么写:

if(saver.ShowDialog() == DialogButtons.OK)

代替:

if(saver.ShowDialog() == DialogResult.OK)