最近想用silverlight做过网站，在做记录网站访问总人数和在线人数这个小功能时候，不想采用读取数据库，然后再写入数据库的方式，因为觉的只是简单的记录，没必要那么麻烦，于是采取直接读取写入txt记事本的方法，没想到其中碾碾转转，采取几种方式，最终才实现完成，下面我想谈谈自己的完成的整个过程，包括失败的：
方式一：采取的是在客户端直接读取写入方式。
代码如下：StreamResourceInfo text = Application.GetResourceStream(new Uri("txt/河流总集合.txt", UriKind.RelativeOrAbsolute));
using (StreamReader read = new StreamReader(text.Stream))
{
string line = read.ReadLine();
read.Close();
}
using (StreamWriter writer= new StreamWriter(text.Stream))
{
writer.WriterLine((Convert.ToInt32(line) + 1).ToString());
read.Close();
}
这种方式在客户端读取是没问题的，但是在写入writer时候就会抛出异常，说是权限问题，不知道是否有其他的方法在客户端直接写入的？
方式二：采用独立存储文件方式IsolatedStorageFile
代码如下： ////////////////////////////////读txt
IsolatedStorageFile isf = IsolatedStorageFile.GetUserStoreForApplication();
Stream stream = new IsolatedStorageFileStream("MyText.txt", System.IO.FileMode.Open, System.IO.FileAccess.Read, isf);
System.IO.TextReader reader = new System.IO.StreamReader(stream);
string sLine = reader.ReadLine();
reader.Close(); // Close the reader
stream.Close(); // Close the stream
//////////////////////////////////写txt
IsolatedStorageFile isf1 = IsolatedStorageFile.GetUserStoreForApplication();
Stream stream1 = new IsolatedStorageFileStream("MyText.txt", System.IO.FileMode.Create, System.IO.FileAccess.Write, isf1);
System.IO.TextWriter writer = new System.IO.StreamWriter(stream1);
writer.WriteLine((Convert.ToInt32(sLine) + 1).ToString());
writer.Close(); // Close the reader
stream1.Close(); // Close the stream
这种方式在单机运行，没发布时候是没有问题的，具体问题见：http://bbs.csdn.net/topics/390304940，到现在我也不明白为什么会这样，以IP形式运行就会出现异常，以localhost形式就没问题，不知道是否也是权限访问问题没？
方式三：在论坛里，luoSaiMingJavaAndC网友给我指点了，比较麻烦点的方式-WCF，调用发布服务的形式，在此十分感谢luoSaiMingJavaAndC给我的思路，思路如下：现在后台发布好服务，然后在前台调用。
后台服务模块： [WebMethod]
public string Readtxt(string path)
{
string line = "";
try
{
using (StreamReader myreader = new StreamReader("F:/" + path + ".txt"))
{
line = myreader.ReadLine();
myreader.Close();
}
}
catch (Exception e)
{
MessageBox.Show(e.Message);
}
return line;
}
/// <summary>
/// 登录时候添加在线人数、总人数 +1
/// </summary>
/// <param name="path"></param>
/// <param name="Readline"></param>
[WebMethod]
public void WritetxtAdd(string path, string Readline)
{
//string line = "";
try
{
using (StreamWriter mywrite = new StreamWriter("F:/" + path + ".txt"))
{
mywrite.WriteLine((Convert.ToInt32(Readline) + 1).ToString());
mywrite.Close(); // Close the reader
}
}
catch (Exception e)
{
MessageBox.Show(e.Message);
}
//return line;
}
/// <summary>
/// 注销时候、退出时候在线人数、总人数-1
/// </summary>
/// <param name="path"></param>
/// <param name="Readline"></param>
[WebMethod]
public void WritetxtSub(string path, string Readline)
{
//string line = "";
try
{
using (StreamWriter mywrite = new StreamWriter("F:/" + path + ".txt"))
{
if (Convert.ToInt32(Readline) - 1 >= 0)
{
mywrite.WriteLine((Convert.ToInt32(Readline) - 1).ToString());
}
else
{
mywrite.WriteLine("0");
}
mywrite.Close(); // Close the reader
}
}
catch (Exception e)
{
MessageBox.Show(e.Message);
}
//return line;
}
客户端调用服务代码：
MytxtSoapClient = new Mytxt.MytxtSoapClient();
MytxtSoapClient.ReadtxtCompleted += new EventHandler<Mytxt.ReadtxtCompletedEventArgs>(MytxtSoapClient_ReadtxtCompleted);
MytxtSoapClient.ReadtxtAsync("访问总人数");
MytxtSoapClient1 = new Mytxt.MytxtSoapClient();
MytxtSoapClient1.ReadtxtCompleted += new EventHandler<Mytxt.ReadtxtCompletedEventArgs>(MytxtSoapClient_ReadtxtCompleted1);
MytxtSoapClient1.ReadtxtAsync("当前在线人数");
/// <summary>
/// 先读访问总人数txt，再访问总人数+1
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void MytxtSoapClient_ReadtxtCompleted(object sender, Mytxt.ReadtxtCompletedEventArgs e)
{
string readtxt = e.Result.ToString();
MytxtSoapClient2 = new Mytxt.MytxtSoapClient();
MytxtSoapClient2.WritetxtAddAsync("访问总人数", readtxt);
// login = true;
}
/// <summary>
/// 先读当前在线人数txt，再当前在线人数+1
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
//bool login = false;
private void MytxtSoapClient_ReadtxtCompleted1(object sender, Mytxt.ReadtxtCompletedEventArgs e)
{
string readtxt = e.Result.ToString();
MytxtSoapClient3 = new Mytxt.MytxtSoapClient();
MytxtSoapClient3.WritetxtAddAsync("当前在线人数", readtxt);
//InitialPage myp = this.Parent as InitialPage;
//myp.gotopage(new MainPage());
//login = true;
}
/// <summary>
/// 先读当前在线人数txt，再当前在线人数-1
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void MytxtSoapClient_ReadtxtCompleted2(object sender, Mytxt.ReadtxtCompletedEventArgs e)
{
string readtxt = e.Result.ToString();
MytxtSoapClient4 = new Mytxt.MytxtSoapClient();
MytxtSoapClient4.WritetxtSubAsync("当前在线人数", readtxt);
}
这种方式也有个问题必须要控制好，那就是同步异步问题，我在实现的过程中就出现一点问题，在登陆页面登陆时候实现了总人数、在线人数均+1，但是跳到主页面时候，却没有同步更新，主页面读取的还是原来的数据，必须要刷新一次才显示新的txt数据。
登陆页面的登陆按钮事件：
private void Login_click(object sender, RoutedEventArgs e)
{
MytxtSoapClient = new Mytxt.MytxtSoapClient();
MytxtSoapClient.ReadtxtCompleted += new EventHandler<Mytxt.ReadtxtCompletedEventArgs>(MytxtSoapClient_ReadtxtCompleted);
MytxtSoapClient.ReadtxtAsync("访问总人数");
MytxtSoapClient1 = new Mytxt.MytxtSoapClient();
MytxtSoapClient1.ReadtxtCompleted += new EventHandler<Mytxt.ReadtxtCompletedEventArgs>(MytxtSoapClient_ReadtxtCompleted1);
MytxtSoapClient1.ReadtxtAsync("当前在线人数");
/////////////////////////////////////
InitialPage myp = this.Parent as InitialPage;
myp.gotopage(new MainPage());
}
这里我以为是按代码的顺便来的，顺着我的思路，先读取txt再写入+1，之后才跳转到主页面MainPage的，结果断点跟踪时候发现不是。
主页面读取：
public MainPage()
{
MytxtSoapClient = new Mytxt.MytxtSoapClient();
MytxtSoapClient.ReadtxtCompleted += new EventHandler<Mytxt.ReadtxtCompletedEventArgs>(MytxtSoapClient_ReadtxtCompletedOnlyread);
MytxtSoapClient.ReadtxtAsync("访问总人数");
MytxtSoapClient1 = new Mytxt.MytxtSoapClient();
MytxtSoapClient1.ReadtxtCompleted += new EventHandler<Mytxt.ReadtxtCompletedEventArgs>(MytxtSoapClient_ReadtxtCompleted1onlyread);
MytxtSoapClient1.ReadtxtAsync("当前在线人数");
}
到这里可能是同步问题所导致的，luoSaiMingJavaAndC又给我指点了linq to rx 思路，说是 对异步控制很好，让我尝试一下！对于linq这种方式我不是很熟悉，我是菜鸟来的，以前读取数据库都是那种方式：先连接数据库再读取数据、操作数据，最后再关闭的，很古老的方式，对于这种linq绑定数据库控件方式了解不多。听取luoSaiMingJavaAndC意见，我去学习了解linq方式，最后终于解决了这个问题，十分感谢luoSaiMingJavaAndC对我的帮助，衷心的感谢！