C#中的SaveFileDialog、OpenFileDialog控件用法

目录

​​一、OpenFileDialog用法：​​

​​二、SaveFileDialog用法：​​

​​三、获取文件路径和文件名、扩展名​​

​​四、textBox中光标定位到最后一行​​

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一、OpenFileDialog用法：

private void mi_OpenFile_Click(object sender, EventArgs e)
        {
            if (openFileDialog1.ShowDialog()==DialogResult.OK)
            {
                _FileName = openFileDialog1.FileName;
                System.IO.StreamReader sr;//申明一个流读取器类变量 sr
                sr = new System.IO.StreamReader(_FileName,Encoding.UTF8);
                textBox1.Text = sr.ReadToEnd();//读取文本文件中的所有数据
                sr.Close();

                this.Text = _FileName;
                _IsSaved = true;
            }
        }

二、SaveFileDialog用法：

private void SaveTextFile(string fileName)
        {
            StreamWriter sw = new StreamWriter(fileName);//申明一个流写入器类型的变量sw并实例化了
            sw.WriteLine(textBox1.Text);//textBox1中的内容写入sw流中
            sw.Flush();//流内容写入磁盘文件中
            sw.Close();//最后要关闭写入状态

            _IsSaved = true;
            this.Text = fileName;
        }

        private void mi_SaveAs_Click(object sender, EventArgs e)
        {
            if (_FileName == "")
                _FileName = this.Text;

            saveFileDialog1.FileName = _FileName;
            if(saveFileDialog1.ShowDialog()==DialogResult.OK)
            {
                _FileName = saveFileDialog1.FileName;
                SaveTextFile(_FileName);
            }
        }

三、获取文件路径和文件名、扩展名

string fullPath = @"e:/xxx/csharp_teach/week09/notepad.exe";

string fileName = System.IO.Path.GetFileName(fullPath);//文件名 “notepad.exe”
string extFile = System.IO.Path.GetExtension(fullPath);//扩展名 “.exe”
string mainFile = System.IO.Path.GetFileNameWithoutExtension(fullPath);// 主文件名（无扩展名） “notepad”