C#流

在顶端加入using System.IO就可以使用流

 

StreamReder a = new StreamReder();//读取前面什么都可以 = sr.ReadToEnd();//用法StreamWriter a = new StreamWriter();//写入

窗体对话框

ColorDialog //选择颜色的对话框FloderBrowserDialog //弹出一个对话框提示用户选择文件夹FontDialog //弹出一个对话框提示用户选择字体或者字体颜色OpenFileDialog //弹出一个对话框提示用户打开文件夹SeveFileDialog //弹出一个对话框提示用户选择保存文件的位置//字体用法DialogResult a = fontDialog1.ShowDialog();            if (a == DialogResult.OK)            {                textBox1.Font = fontDialog1.Font;                textBox1.ForeColor = fontDialog1.Color;            }//打开用法openFileDialog1.Filter = "文本文件|*.txt";            DialogResult a = openFileDialog1.ShowDialog();            if (a == DialogResult.OK)            {                string b = openFileDialog1.FileName;                StreamReader sr = new StreamReader(b, Encoding.Default);                textBox1.Text = sr.ReadToEnd();            }//保存用法    string f = "";        private void 保存SToolStripMenuItem_Click(object sender, EventArgs e)        {            if (f.Length <= 0)            {                saveFileDialog1.Filter = "文本文件|*.txt";                saveFileDialog1.FileName = "新建文本文档";                DialogResult a = saveFileDialog1.ShowDialog();                if (a == DialogResult.OK)                {                    string s = saveFileDialog1.FileName;                    StreamWriter sr = new StreamWriter(s);                    sr.Write(textBox1.Text);                    sr.Flush();                    f = s;                }            }            else            {                StreamWriter sr = new StreamWriter(f);                sr.Write(textBox1.Text);                sr.Flush();            }        }//另存为用法            saveFileDialog1.Filter = "文本文件|*.txt";            saveFileDialog1.FileName = "新建文本文档";            DialogResult a = saveFileDialog1.ShowDialog();            if (a == DialogResult.OK)            {                string s = saveFileDialog1.FileName;                StreamWriter sr = new StreamWriter(s);                sr.Write(textBox1.Text);                sr.Flush();            }