我想在C#中实现以下功能：当文件不存在时，创建；当文件存在时，改写。
我下面的代码编译没有问题，但是不能创建和改写文件。请指点
string filePath = "test.txt";
//Response.Write(filePath);
StreamWriter sw = new StreamWriter(filePath, false, Encoding.Unicode);
string content = "aaaaaaaaaaaaaaaa";
sw.Write(content);
sw.Flush();
sw.Close();
------解决方案--------------------------------------------------------
- C# code
if (File.Exists(Server.MapPath("Test.txt"))) { FileStream fs = new FileStream(Server.MapPath("Test.txt"),FileMode.OpenOrCreate,FileAccess.Write); StreamWriter sw = new StreamWriter(fs); sw.WriteLine("测试"); sw.Close(); fs.Close(); } else { File.Create(Server.MapPath("Test.txt")); FileStream fs = new FileStream(Server.MapPath("Test.txt"), FileMode.Open, FileAccess.Write); StreamWriter sw = new StreamWriter(fs); sw.WriteLine("测试"); sw.Close(); fs.Close(); }