无处不在的HttpContext
由于ASP.NET提供了静态属性HttpContext.Current，因此获取HttpContext对象就非常方便了。
也正是因为这个原因，所以我们经常能见到直接访问HttpContext.Current的代码：
public class Class1
{
public Class1()
{
string file = HttpContext.Current.Request.MapPath("~/App_Data/xxxxxx.xml");
string text = System.IO.File.ReadAllText(file);
//..........其它的操作
}
// 或者在一些方法中直接使用HttpContext.Current
public void XXXXX()
{
string url = HttpContext.Current.Request.RawUrl;
string username = HttpContext.Current.Session["username"].ToString();
string value = (string)HttpContext.Current.Items["key"];
}
// 甚至还设计成静态属性
public static string XXX
{
get
{
return (string)HttpContext.Current.Items["XXX"];
}
}
}
这样的代码，经常能在类库项目中看到，由此可见其泛滥程度。
难道这些代码真的没有问题吗？
有人估计会说：我写的代码是给ASP.NET程序使用的，又不是给控制台程序使用，所以没有问题。
真的是这样吗？
http://tieba.baidu.com/p/5632998173
http://tieba.baidu.com/p/5634106628
http://www.cnblogs.com/taobao1/p/8722203.html
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