How to pass attributes and methods (reflection) In User Controls ))

How do I pass attributes and methods in a user control? Because the control is executed after the page, it is often unable to obtain the value passed by the control. For example, to upload a file control, if it is made a user control, you cannot obtain the uploaded file name at the time of submission. The solution is to use the reflection mechanism to define the attributes of the user control, it is used to pass the value and define the user control method. It is used to pass the property value to the call page. Page_load: //Use the reflection mechanism to obtain the type of the user control. uctype = {name = "usctrlupload_ascx" fullname = "ASP. usctrlupload_ascx "} usctrlupload_ascx is the name corresponding to the user control name and is copied from the debugging. TypeUctype = usctrlupload1.gettype (); //Use propertyinfo to obtain the attributes in the user control. PropertyinfoUctextname = uctype. getproperty ("Picname");//PicnameIs the property in the user control, as shown in the following figure. //Set and obtain values in the user control. Uctextname. setvalue (usctrlupload1,"123456",Null);//Use the propertyinfo instance method to test the assignment. This is just to test the effect of setting the value. The main thing is how to obtain the property value of the control. Label2.text = uctextname. getvalue (usctrlupload1,Null). Tostring (); // usctrlupload1User Control ID. //In this way, you can also obtain and set the property values in the control. However, it seems unstable, and the row does not work. Label2.text = usctrlupload1.picname; In the page button event: Protected VoidButton#click (ObjectSender,EventargsE) { TypeUctype = usctrlupload1.gettype (); //Use the methodinfo class to obtain the methods in the user control. MethodinfoUcmethod = uctype. getmethod ("Button#click");//Button#clickControl. //On this page, execute the methods in the user control. Object[] Argumentarrray =New Object[2]; Ucmethod. Invoke (usctrlupload1, argumentarrray );//Call methods in the user control. Executed here !!. PropertyinfoUctextname = uctype. getproperty ("Picname"); Label2.text = uctextname. getvalue (usctrlupload1,Null). Tostring ();//Obtained the information of the uploaded file name. And displayed on the page. //In this way, you can also obtain and set the property values in the control. However, it seems unstable, and the row does not work. // Label2.text = usctrlupload1.picname; } Appendix: Attributes defined in the user control. CS file: Public StringPicname { Get{ReturnLabel2.text ;} Set{Label2.text =Value;} } Methods defined in the user control. CS file: Public VoidButton#click (ObjectSender,EventargsE) { If(Fileupload1.hasfile) { Label2.text = fileupload1.postedfile. filename; } Note: The button event method is used here and can be modified at will. The widget does not contain a button. The button is placed on the page.