Question

c#在d盘根目录下创建TXT的代码

Answer 1

 if (!File.Exists("D:\\TestTxt.txt"))
            {
                FileStream fs1 = new FileStream("D:\\TestTxt.txt", FileMode.Create, FileAccess.Write);//创建写入文件 
                StreamWriter sw = new StreamWriter(fs1);
                sw.WriteLine(this.textBox3.Text.Trim() + "+" + this.textBox4.Text);//开始写入值
                sw.Close();
                fs1.Close();
}
            else
            {
                FileStream fs = new FileStream("D:\\TestTxt.txt", FileMode.Open, FileAccess.Write);
                StreamWriter sr = new StreamWriter(fs);
                sr.WriteLine("Hello");//开始写入值
                sr.Close();
                fs.Close();
            }

Answer 2

File.AppendAllText("D:\\TestTxt.txt", textBox1.Text, Encoding.Default);