判断已经有了 这里给出追加的 using System; using System.IO; using System.Text;class Test { public static void Main() { string path = @"c:\temp\MyTest.txt"; // This text is added only once to the file. if (!File.Exists(path)) { // Create a file to write to. string createText = "Hello and Welcome" + Environment.NewLine; File.WriteAllText(path, createText); } // This text is always added, making the file longer over time // if it is not deleted. string appendText = "This is extra text" + Environment.NewLine; File.AppendAllText(path, appendText); // Open the file to read from. string readText = File.ReadAllText(path); Console.WriteLine(readText); } }
public void OK() { string path = "";//文件路径 System.IO.StreamWriter writer = null;//写文件的类 if (System.IO.File.Exists(path)) { writer = new System.IO.StreamWriter(System.IO.File.OpenWrite(path)); } else { writer = new System.IO.StreamWriter(System.IO.File.Create(path)); } //writer.Write();//写入一个字符串 //writer.WriteLine();//写入字符串之后换行 writer.Close();//写完之后关闭 }
StreamReader reader = null;
reader=new StreamReader(Server.MapPath("foot.txt"),System.Text.Encoding.Default);
string str_foot=reader.ReadToEnd().Trim();
if(str_foot!=null)
{
2个问题不会
}
这里给出追加的
using System;
using System.IO;
using System.Text;class Test
{
public static void Main()
{
string path = @"c:\temp\MyTest.txt"; // This text is added only once to the file.
if (!File.Exists(path))
{
// Create a file to write to.
string createText = "Hello and Welcome" + Environment.NewLine;
File.WriteAllText(path, createText);
} // This text is always added, making the file longer over time
// if it is not deleted.
string appendText = "This is extra text" + Environment.NewLine;
File.AppendAllText(path, appendText); // Open the file to read from.
string readText = File.ReadAllText(path);
Console.WriteLine(readText);
}
}
public void OK()
{
string path = "";//文件路径
System.IO.StreamWriter writer = null;//写文件的类
if (System.IO.File.Exists(path))
{
writer = new System.IO.StreamWriter(System.IO.File.OpenWrite(path));
}
else
{
writer = new System.IO.StreamWriter(System.IO.File.Create(path));
}
//writer.Write();//写入一个字符串
//writer.WriteLine();//写入字符串之后换行
writer.Close();//写完之后关闭
}