空路径名不合法错误 [英] empty path name is not legal Error

问题描述

我在打开对话框中单击取消"后单击打开或保存命令n时在记事本应用程序上工作，但出现错误.

im working on a notepad application when i click on open or save command n after click on cancel in opendialoge box i got error.

private void openToolStripMenuItem_Click(object sender, EventArgs e)
       {
           OpenFileDialog dlg = new OpenFileDialog();
           dlg.Title = "Open";
           dlg.Filter = "Text Documents(*.*)|*.*|All Files(*.*)|*.*";
           dlg.ShowDialog();
           richTextBox1.LoadFile(dlg.FileName);

       }

       private void saveToolStripMenuItem_Click(object sender, EventArgs e)
       {
           SaveFileDialog dlg = new SaveFileDialog();
           dlg.Title = "Open";
           dlg.Filter = "Text Documents(*.*)|*.*|All Files(*.*)|*.*";
           dlg.ShowDialog();
           richTextBox1.SaveFile(dlg.FileName);
       }

推荐答案

这表明文件名变量引用的是空字符串.
加载文件之前，您应该进行更多检查:

That suggests that the filename variable refers to an empty string.
You should include more checks before loading file:

OpenFileDialog dlg = new OpenFileDialog();
            dlg.Title = "Open";
            dlg.Filter = "Text Documents(*.*)|*.*|All Files(*.*)|*.*";
            if (dlg.ShowDialog() == System.Windows.Forms.DialogResult.OK)
            {
                if (!string.IsNullOrEmpty(dlg.FileName))
                {
                    richTextBox1.LoadFile(dlg.FileName);
                }
            }

始终检查返回值:

Always check the return value:

private void openToolStripMenuItem_Click(object sender, EventArgs e)
{
    OpenFileDialog dlg = new OpenFileDialog();
    dlg.Title = "Open";
    dlg.Filter = "Text Documents(*.*)|*.*|All Files(*.*)|*.*";
    if (dlg.ShowDialog() == DialogResult.OK)
    {
        richTextBox1.LoadFile(dlg.FileName);
    }
}

private void saveToolStripMenuItem_Click(object sender, EventArgs e)
{
    SaveFileDialog dlg = new SaveFileDialog();
    dlg.Title = "Open";
    dlg.Filter = "Text Documents(*.*)|*.*|All Files(*.*)|*.*";
    if (dlg.ShowDialog() == DialogResult.OK)
    {
        richTextBox1.SaveFile(dlg.FileName);
    }
}

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