不知何故,一个COM组件被重复下载,以下是针对这个问题的检查点:
1.Check <Windows Dir>\Downloaded Program Files
2.Check 注册表中My Computer\HKEY_CLASSES_ROOT\<Class Name>\CLSID
后发现,已下载的com组件的version与HTML中指定的版本不同,故反复下载.
<OBJECT id=<??????> onresize=\”window.oExportsDialog.fnSetSize ()\” codeBase=http://<myhost>/???.cab#Version=1,0,21,1975 data=data:application/x-oleobject;base64,+jIurin7Qky/+XrPoasKGxAHAAATIQAA3BEAAA== border=0
classid=CLSID:??????????????????????? name=????></OBJECT>
这两个单词我一直记不住
authentication (checking a user’s identity) and authorization (verifying a user’s right to access resources).
authentication,就象有人敲门时问”谁!”,对应”then”的发音.
authorization,是看用户的权限(right),对应”ri”的发音.
在页面中使用HTML标记：
<HEAD>
<META http-equiv=Pragma content=no-cache>
<META http-equiv=Cache-Control content=no-cache>
<META HTTP-EQUIV=”Expires” CONTENT=”-1″>
CACHE-CONTROL (49) Cache control directives.
PRAGMA (17) Implementation-specific directives that might apply to any recipient along the request/response chain.
EXPIRES (10) Date and time after which the resource should be considered outdated.
HOWTO：防止在 Internet Explorer 中进行缓存
http://support.microsoft.com/kb/234067/zh-cn
1. null 参数的传入
COM components don’t support parameter overloading, so for each value in a parameter list, you’ve got to pass in something, even if it does nothing.
Moreover, COM parameters are always passed by reference, which means that you can’t pass in a null value.
Instead of creating “dummy” object variables, the Type.Missing field can be used.
class Program
{
private static Object OptionalParamHandler = Type.Missing;
static void Main(string[] args)
{
Application NewExcelApp = new Application();
NewExcelApp.Worksheets.Add(ref OptionalParamHandler,
ref OptionalParamHandler, ref OptionalParamHandler,
ref OptionalParamHandler);
}
}
2. RuntimeWrappedException(new in .net 2.0)
COM errors won’t be CLS compliant, they won’t be caught with Exception, .net 2.0提供
RuntimeWrappedException封装了Non CLS-Compliant的异常.
代码一般写成:
private static void IllustrateExceptions()
{
try
{
// Something that throws an exception
}
catch (Exception ex)
{
// In 1.x this will catch only CLS-Compliant
// In 2.0 both CLS and Non CLS-Compliant will
// be caught by this block.
}
catch
{
// All exceptions, CLS-Compliant and Non CLS-Compliant are caught
}
}
3. COM interop的缺点:
Static members COM objects are fundamentally different from .NET types. One of the differences is lack of support for static members.
Parameterized constructors COM types don’t allow parameters to be passed into a constructor. This limits the control you have over initialization and the use of overloaded constructors.
Inheritance One of the biggest issues is the limitations COM objects place on the inheritance chain. Members that shadow members in a base class aren’t recognizable, and therefore, aren’t callable or usable in any real sense.
Portability Operating systems other than Windows don’t have a registry. Reliance on the Windows registry limits the number of environments a .NET application can be ported to.
如果一个.NET Class要被COM使用,就必须:
提供无参数的构造函数,暴露给COM的type和type member必须为public.
Abstract clsss 不能被COM使用.
ASP.NET Web Server Controls Overview
http://msdn2.microsoft.com/en-us/library/zsyt68f1.aspx
Overview of user controls vs. custom controls
http://support.microsoft.com/kb/893667/en-us
UserControl和WebControl 的比较
UserControl用于单个程序,WebControl用于多个程序,易于发布
WebControl缺乏对Design Time的支持
UserControl适用于固定布局,WebControl适用于动态布局
http://www.microsoft.com/china/technet/webcasts/class/windowsserver1.mspx
可以作为Windows internals 4e的参考.
1.Windows的昨天,今天和明天
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Windows Operating System Internals Curriculum Resource Kit (CRK) Windows Vista Kernel Changes |
在.NET1.0中提供了
Assembly.Load(string assemblyString)
根据assembly的display name加载.
Assembly SampleAssembly = Assembly.Load(”SampleAssembly, Version=1.0.2004.0, Culture=neutral, PublicKeyToken=8744b20f8da049e3″);
Assembly.LoadFrom(string assemblyFile)
根据assembly所在的路径( 相对于当前目录)加载.
Assembly SampleAssembly = Assembly.LoadFrom(”c:\\Sample.Assembly.dll”);
在.NET1.1中又提供了
Assembly.LoadFile(string path)
LoadFile 与LoadFrom的比较:
LoadFile does not load files into the LoadForm context, and does not resolve dependencies using the load path,
LoadFrom cannot be used to load assemblies that have the same identities but different paths
在.NET 2.0中提供了
Assembly.ReflectionOnly属性(readonly)
指示assembly是否被加载到reflection-only context中
Assembly.ReflectionOnlyLoad(string assemblyString)
根据assembly的display name加载assembly到reflection-only context中.
string fullName = “System.Transactions, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089″;
Assembly theAssembly = Assembly.ReflectionOnlyLoad( fullName );
Assembly.ReflectionOnlyLoadFrom(string assemblyFile)
根据assembly所在的路径( 相对于当前目录)加载assembly到reflection-only context中.
string file = “c:\\a.dll“;
Assembly theAssembly = Assembly.ReflectionOnlyLoadFrom( file );
PRB：Assembly.LoadFrom 不加载与其位于同一目录的依赖程序集
http://support.microsoft.com/kb/327435/zh-cn
Reflection Only Assembly Loading
http://blogs.msdn.com/junfeng/archive/2004/08/24/219691.aspx
LoadFile vs. LoadFrom
http://blogs.msdn.com/suzcook/archive/2003/09/19/loadfile-vs-loadfrom.aspx
WindowsIdentity
http://support.microsoft.com/kb/319615/zh-cn
static public bool CheckAccount(string userName, string pwd)
{
string user = userName;
string domin = System.Environment.MachineName;
IntPtr tokenHandle = new IntPtr(0);
if (userName.Contains(”\\”))
{
string[] arr = userName.Split(new char[] { ‘\\’});
user = arr[1];
domin = arr[0];
}
// Call LogonUser to obtain an handle to an access token.
bool returnValue = LogonUser(user, domin, pwd,
LOGON32_LOGON_INTERACTIVE, LOGON32_PROVIDER_DEFAULT,
ref tokenHandle);
return returnValue;
}
[DllImport(”advapi32.dll”, SetLastError = true)]
public extern static bool LogonUser(String lpszUsername, String lpszDomain,
String lpszPassword, int dwLogonType,
int dwLogonProvider, ref IntPtr phToken);
const int LOGON32_PROVIDER_DEFAULT = 0;
//This parameter causes LogonUser to create a primary token.
const int LOGON32_LOGON_INTERACTIVE = 2;
const int SecurityImpersonation = 2;
Using MADS to Execute multiple commands on a connecton.
Add MultipleActiveResultSets=true into the connection string.
在connection string中指定 Asynchronous Processing = true.
Sample:
string strConn = “Data Source=.; Database=Pubs; Integrated Security=true; Asynchronous Processing=true”;
using (SqlConnection cn = new SqlConnection(strConn))
{
using(SqlCommand cmd = cn.CreateCommand())
{
cmd.CommandText = “”;
IAsyncResult ar = command.BeginExecuteReader();
// …
// do other processing
// …
SqlDataReader r = command.EndExecuteReader(ar);
}
}
参考
Asynchronous Command Execution in ADO.NET 2.0
http://msdn2.microsoft.com/en-us/library/ms379553(VS.80).aspx
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常见的手法: 如何检查XSS 防御 The Cross Site Scripting (XSS) FAQ How To: Prevent Cross-Site Scripting in ASP.NET MS Anti-Cross Site Scripting Library V1.5 |
1. DataRow state and DataRow version
http://msdn2.microsoft.com/zh-cn/library/ww3k31w0(VS.80).aspx
2.DataTabel.Load
http://msdn2.microsoft.com/zh-cn/library/4e06d41f(vs.80).aspx
3.DataViewRowState Enumeration
DataView.RowStateFilter = DataViewRowState.???
FTP Server的port 21用于传输名令
Active Mode:
Client使用port n和server port 21建立连接,传输命令 port, Server 使用端口20和Client端口n+1建立连接,如果client安装了firewall,server 会被block.
Passive Mode:
Client使用port n和server port 21建立连接,传输命令 pasv, Server 选择使用端口p和Client建立连接,并把p发送给client,由clien使用端口n+1和server的端口p建立连接.
List<T>.Find的定义为:
public T Find (Predicate<T> match)
Predicate的定义为
public delegate bool Predicate<T> (T obj)
当前 List 的元素被逐个传递给 Predicate 委托，并在 List 中向前移动，
下面的代码可以找出名为jeep的Car
public class CarList
{
List<Car> carList = new List<Car>();
Car jeep = carList.Find(FindJeep)
private static bool FindJeep(Car car)
{
ret car.Name = “jeep”;
}
}
假设要找出和updateCar的Name相同的Car,改如何实现FineCarWithSameName方法?
public void Update(Car updateCar)
{
Car carFound = carList.Find(FineCarWithSameName);
}
问题在于在FineCarWithSameName方法中不能访问变量updateCar,此时使用匿名方法就可以解决:
public void Update(Car updateCar)
{
Car carFound = carList.Find(
delegate(Car car)
{
return car.Name == updateCar.Name;
});
}
http://www.codeproject.com/csharp/SimpleLogParse.asp
Download and install Log parser 2.2 from Microsoft
Add a reference to LogParser.dll in the installation directory
using MSUtil;
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