c# 创建指定大小的空字符填充的文本文件 在指定位置读写相关内容

private void button1_Click(object sender, EventArgs e)

{

string strFilePath = @"F:\empty.txt";

//创建用指定大小的空字符填充的文本文件

FileStream fs = new FileStream(strFilePath, FileMode.OpenOrCreate);

byte[] byteArray = new byte[1024];

fs.Write(byteArray, 0, byteArray.Length);

fs.Close();

//在指定位置填写相关内容

FileStream fsA = new FileStream(strFilePath, FileMode.Open);

byte[] byteA = System.Text.Encoding.Default.GetBytes("http://freeliver54.cnblogs.com/");

fsA.Seek(150, SeekOrigin.Current);

fsA.Write(byteA, 0, byteA.Length);

fsA.Close();

FileStream fsB = new FileStream(strFilePath, FileMode.Open);

byte[] byteB = System.Text.Encoding.Default.GetBytes("hello");

fsB.Seek(10, SeekOrigin.Current);

fsB.Write(byteB, 0, byteB.Length);

fsB.Close();

//从指定位置读相关内容

FileStream fsC = new FileStream(strFilePath, FileMode.Open);

byte[] byteC = new byte[7];

fsC.Seek(9, SeekOrigin.Current);

fsC.Read(byteC, 0, byteC.Length);

fsC.Close();

//string str = System.Text.Encoding.Default.GetString(byteC); //读出内容为 \0hello\0

string strArray = "";

for (int i = 0; i < byteC.Length; i++)

{

strArray += byteC[i].ToString() + " ";

}

this.textBox1.Text = strArray;

}