C # Develop ActiveX for accessing SQL data, moving mouse events, drawing, and Javascript operations ActiveX

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Address: http://www.bmpj.net/thread-1206-1-1.html

I,
Development Environment
1. VS2005 C #
2. The accessed database SQL2000
2. Establish project and project preparation
1. Create a "Windows control library", name it "MyControl", and change the "UserControl1" control to "WEB ".
2. Select "MyControl" project "properties", set "register for COM Interop" to "select status", and select "generate serialization assembly" to "off" status, generally, it can be set to "automatic.

3. Find the "AssemblyInfo. cs" file under the project,
(1) Add code:

[Assembly: AllowPartiallyTrustedCallers ()]

Note: Some trusted codes are allowed to call assembly with strong names. Without this declaration, such an assembly can be used only for fully trusted calls.

(2) Change "[assembly: ComVisible (false)]" to "[assembly: ComVisible (true)]"
Note: The ComVisible attribute controls the accessibility of individual hosted types, members, or all types to COM in a dataset.

(3) Comment out "[assembly: Guid (" 8a4af041-84fd-4d8c-aed2-3916f6135bf4.

Every time a project is regenerated, The classid changes and the classid referenced on the webpage is not fixed. Therefore, this line of code is useless (this is proved by practice and the reason is unknown ).

4. Find the project code file "WEB. cs ". Adds the Guid attribute. You can select "tool"> "create GUID" in the development environment to create a unique GUID.
(1) Add a reference to the namespace "using System. Runtime. InteropServices.

(2)
Add "[Guid (" F7D892EA-9546-3BEB-A8D9 -67A 859A 407D6 ")]"

Note: a fixed classid is defined for this component of this project to facilitate the reference of the classid object on the webpage. It also replaces the "assembly: Guid" attribute.

At this time, the project environment is ready. You can write the code below.
5. After the project is generated, check whether the Guid of this component on the local machine is consistent with the one we set. If they are inconsistent, we cannot correctly reference the classid, the corresponding components cannot be displayed on the webpage.
Find the OleView. Exe program under the "Microsoft Visual Studio 8 \ Common7 \ Tools \ Bin" directory, run the program, and select ". NET Category ",

III,
Web pages reference the MyControl project component, that is, ActiveX in the general sense.

<Object id = "MyControl" name = "MyControl" classid = "clsid: F7D892EA-9546-3BEB-A8D9-67A859A407D6" Width = "500" Height = "400" VIEWASTEXT/>
Note: Check whether the classid and Guid settings are consistent.
4. demonstrate the effects of SQL data access, moving mouse events, painting, and javascript operation components.

 

Source code, database, instructions for downloading

Http://dl.dbank.com/c0sc41jhxt