【C#】对文本、图片、音频文件的读取与写入

对于文件的存储都采用流（System.IO.Stream）形式存储与读取

1.文件流——FileStream 包括： StreamWriter和 BinaryWriter

2.缓存流——BufferStream

3.内存流——MemoryStream

4.网络流——NetworkStream

注：针对文本形式的采用————StreamWriter和 StreamReader类；

对与图片，压缩文件等二进制流文件采用———— BinaryWriter和 BinaryReader类

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一、 //对文本的操作，即读取与写入（ StreamWriter和 StreamReader）

public void OperatFile()
{
if (ishe==false )
{
SaveFileDialog sfd1 = new SaveFileDialog();
sfd1.InitialDirectory = @"C:\My\Text";
//设置文件保存类型
sfd1.Filter = "txt文件|*.txt|所有文件|*.*";
//如果用户没有输入扩展名，自动追加后缀
sfd1.AddExtension = true;
//设置标题
sfd1.Title = "file";
if (sfd1.ShowDialog() == DialogResult.OK)
{
FileStream fs = new FileStream(Path.GetFileName(sfd1.FileName), FileMode.Open, FileAccess.ReadWrite);
StreamWriter sw = new StreamWriter(fs);
sw.Write(textBoxX1.Text,Encoding.Default);
sw.Close();
fs.Close();

}
labelX1.Text = "文件保存成功！";
}
else
{
OpenFileDialog ofd1 = new OpenFileDialog();
ofd1.Filter = "txt文件|*.txt|所有文件|*.*";
if (ofd1.ShowDialog() == DialogResult.OK)
{
FileStream fs = new FileStream(ofd1.FileName, FileMode.Open, FileAccess.ReadWrite);
StreamReader sr = new StreamReader(fs, Encoding.Default);

s = sr.ReadLine();
while (sr.Peek() != -1)
{
textBoxX1.Text += s;
s = sr.ReadLine();
}
sr.Close();
fs.Close();

}
labelX1.Text = "打开文件：" + ofd1.FileName;
}
labelX1.Text = "文件保存成功！";
}

二、 //对图片的操作，即读取与写入（ BinaryWriter和 BinaryReader ）

public void OperatImage()
{
if (ishe == false)
{
OpenFileDialog ofd1 = new OpenFileDialog();
// ofd1.Filter = "bin文件|*.bin";
ofd1.Filter = "jpg图片|*.jpg|gif图片|*.gif|png图片|*.png";
if (ofd1.ShowDialog() == DialogResult.OK)
{
FileStream fs = new FileStream(ofd1.FileName, FileMode.Open);
BinaryReader br = new BinaryReader(fs);
int lenth = Convert.ToInt32(br.BaseStream.Length);

bytes = br.ReadBytes(lenth);
using (FileStream fs1 = new FileStream(@"G:\My\Picture\text.bin", FileMode.Create))
{
BinaryWriter bw = new BinaryWriter(fs1);
for (int i = 0; i < bytes.Length; i++)
{
bw.Write(bytes[i]);
}
bw.Close();
}
br.Close();
fs.Close();
MemoryStream ms = new MemoryStream(bytes);
//设置图片框 pictureBox1中的图片
this.pictureBox1.Image = Image.FromStream(ms);
}

}
else
{
OpenFileDialog ofd1 = new OpenFileDialog();
ofd1.Filter = "bin文件|*.bin";
// ofd1.Filter = "jpg图片|*.jpg|gif图片|*.gif|png图片|*.png";
if (ofd1.ShowDialog() == DialogResult.OK)
{
FileStream fs = new FileStream(ofd1.FileName, FileMode.Open);
BinaryReader br = new BinaryReader(fs);
int lenth = Convert.ToInt32(br.BaseStream.Length);
bytes = br.ReadBytes(lenth);
br.Close();
fs.Close();
//实例化一个内存流--->把从文件流中读取的内容[字节数组]放到内存流中去
MemoryStream ms = new MemoryStream(bytes);
//设置图片框 pictureBox1中的图片
this.pictureBox1.Image = Image.FromStream(ms);
}
labelX2.Text = "打开文件：" + ofd1.FileName;
}
}

三、 //对音频的操作，即读取与写入（ BinaryWriter和 BinaryReader ）

public void OperatAudio()
{
if (ishe == false)
{
OpenFileDialog ofd1 = new OpenFileDialog();
ofd1.Filter = "mp3音频|*.mp3|wma音频|*.wma";
if (ofd1.ShowDialog() == DialogResult.OK)
{
FileStream fs = new FileStream(ofd1.FileName, FileMode.Open);
BinaryReader br = new BinaryReader(fs);
int lenth = Convert.ToInt32(br.BaseStream.Length);

bytes = br.ReadBytes(lenth);
using (FileStream fs1 = new FileStream(@"G:\My\Video\text.bin", FileMode.Create))
{
BinaryWriter bw = new BinaryWriter(fs1);
for (int i = 0; i < bytes.Length; i++)
{
bw.Write(bytes[i]);
}
bw.Close();
}
br.Close();
fs.Close();

}

}
else
{
OpenFileDialog ofd1 = new OpenFileDialog();
ofd1.Filter = "bin文件|*.bin";
if (ofd1.ShowDialog() == DialogResult.OK)
{
FileStream fs = new FileStream(ofd1.FileName, FileMode.Open);
BinaryReader br = new BinaryReader(fs);
FileStream fs1 = new FileStream(@"G:\My\Video\text.mp3", FileMode.Create);
BinaryWriter bw = new BinaryWriter(fs1);

int lenth = Convert.ToInt32(br.BaseStream.Length);
bytes = br.ReadBytes(lenth);
bw.Write(bytes);
bw.Close();
fs1.Close();
br.Close();
fs.Close();
}
labelX2.Text = "打开文件：" + ofd1.FileName;
}

}