我编写了以下代码来附加现有数据的数据,但我的代码覆盖了这一点
我应该怎么做代码附加数据的更改.
protected void Page_Load(object sender,EventArgs e)
{
fname = Request.Form["Text1"];
lname = Request.Form["Text2"];
ph = Request.Form["Text3"];
Empcode = Request.Form["Text4"];
string filePath = @"E:Employee.txt";
if (File.Exists(filePath))
{
//StreamWriter SW;
//SW = File.CreateText(filePath);
//SW.Write(text);
//SW.Close();
FileStream aFile = new FileStream(filePath,FileMode.Create,FileAccess.Write);
StreamWriter sw = new StreamWriter(aFile);
sw.WriteLine(Empcode);
sw.WriteLine(fname);
sw.WriteLine(lname);
sw.WriteLine(ph);
sw.WriteLine("**********************************************************************");
sw.Close();
aFile.Close();
}
else
{
//sw.Write(text);
//sw.Flush();
//sw.Close();
//StreamWriter SW;
//SW = File.AppendText(filePath);
//SW.WriteLine(text);
//SW.Close();
FileStream aFile = new FileStream(filePath,FileMode.Append,FileAccess.Write);
StreamWriter sw = new StreamWriter(aFile);
sw.WriteLine(Empcode);
sw.WriteLine(fname);
sw.WriteLine(lname);
sw.WriteLine(ph);
sw.WriteLine("**********************************************************************");
sw.Close();
aFile.Close();
//System.IO.File.WriteAllText(filePath,text);
}
Response.Write("Employee Add Successfully.........");
}
解决方法
FileMode.Append的
doc说：
Opens the file if it exists and seeks to the end of the file,or creates a new file. This operation requires FileIOPermissionAccess.Append permission. FileMode.Append can be used only in conjunction with FileAccess.Write. Trying to seek to a position before the end of the file throws an IOException exception,and any attempt to read fails and throws an NotSupportedException exception.
因此不再需要if语句,因为如果文件不存在,FileMode.Append会自动创建该文件.
因此,完整的解决方案是：
using (FileStream aFile = new FileStream(filePath,FileAccess.Write))
using (StreamWriter sw = new StreamWriter(aFile)) {
sw.WriteLine(Empcode);
sw.WriteLine(fname);
sw.WriteLine(lname);
sw.WriteLine(ph);
sw.WriteLine("**********************************************************************");
}
