由 C# 记事本

Question

我是编程新手，我开始创建一个简单的记事本，只有 4 个按钮(打开、保存、新建和字体)。

如果我打开或保存我收到一个错误:这是我的代码:

        //Declare save as a new SaveFileDailog
        SaveFileDialog save = new SaveFileDialog();
        //Declare filename as a String equal to the SaveFileDialog's FileName
        String filename = save.FileName;
        //Declare filter as a String equal to our wanted SaveFileDialog Filter
        String filter = "Text Files|*.txt|All Files|*.*";
        //Set the SaveFileDialog's Filter to filter
        save.Filter = filter;
        //Set the title of the SaveFileDialog to Save
        save.Title = "Save";
        //Show the SaveFileDialog
        if (save.ShowDialog(this) == DialogResult.OK)
        {
            //Write all of the text in txtBox to the specified file
            System.IO.File.WriteAllText(filename, textBox1.Text);
        }
        else
        {
            //Return
            return;
        }//Declare save as a new SaveFileDailog
        SaveFileDialog save = new SaveFileDialog();
        //Declare filename as a String equal to the SaveFileDialog's FileName
        String filename = save.FileName;
        //Declare filter as a String equal to our wanted SaveFileDialog Filter
        String filter = "Text Files|*.txt|All Files|*.*";
        //Set the SaveFileDialog's Filter to filter
        save.Filter = filter;
        //Set the title of the SaveFileDialog to Save
        save.Title = "Save";
        //Show the SaveFileDialog
        if (save.ShowDialog(this) == DialogResult.OK)
        {
            //Write all of the text in txtBox to the specified file
            System.IO.File.WriteAllText(filename, textBox1.Text);
        }
        else
        {
            //Return
            return;
        }

有什么想法吗？感谢和问候

oopss 我忘记写错误了，抱歉:这是错误:“错误:ArgumentException 未处理。空路径名不合法”

如果我打开一个文本文件，我会得到这个。然后它突出显示了这一行代码:textBox1.Text=System.IO.File.ReadAllText(文件名,System.Text.Encoding.Default);

如果我保存什么也不会发生。

谢谢

Answer 1

我希望您应该在用户使用对话框后读取文件名:

System.IO.File.WriteAllText(save.FileName, textBox1.Text);

此外 - SaveFileDialog 是 IDisposable，因此您应该“使用”它...

using (SaveFileDialog save = new SaveFileDialog())
{
    // your code that involves "save"
}