Implementing data updates for Windows programs

1: A new type:

Enumeration:

Enumeration is a descriptive name

Define a limited set of values that cannot contain methods

To constrain a possible value

Enumeration guarantees the rationality of the assignment

2:

public enum grader (name of enum) {Male,female} public Gander Studentgrader; Public Gander studentgrader{get{return studentgender;}　　set{Studentgender =value; }}  the enumerator represents the integer value Console.WriteLine (the "Gender value is: {0}", (int) student. Studentgender);//Gets the integer value (int) student represented by the number of enumeration values. Studentgender); The default value of the initial value can be modified from zero to the initial value code: public enum Gender{male=1,famale = 2}

3: The enumeration is converted to the form of a string:

public enum gender{Male,famale}//... Console.WriteLine ("My Name: {0}, Gender: {1}", this.)　　Name,this.studentgender.tostring ()); Converts the bit string Tostring ();

4: String conversion to enum type:

(Gender)　　(Enum.parse (typeof (Gendder), "Male")); Gets the name of the enumeration type required to convert the string typeof

5: How to display pictures on a form:

PictureBox controls

Image	Display a picture in a control
SizeMode	How to handle the relationship between image and control size
ImageList	Store pictures

6: Properties and events for timer controls (tirm)

InterVal	The frequency, in milliseconds, at which the event occurred.
Enabled	Whether to raise events regularly

Event

Start ()	Start timer
Stop ()	Stop Timer

Attention:

If you find that the Timer control does not work, check that the Enable property is set bit true and the default is False

7: Record the index of the displayed picture when adding a field

If the currently displayed picture index does not have a maximum value, continue to increase

The number of images in the IF (index<this.ilabout.image.count-1)//imagelist {index++;} else{
Otherwise, start with the first one index = 0;} Set picture box to display picture of this. Pbabout.image =ilabout.images[index];---Get the location image specified in ImageList

Note: The definition and initialization of the index variable cannot be written in the program in which the tick event is handled, otherwise the picture cannot be rotated

Summarize:

1: Use the PictureBox control to display pictures on a form

2: Use the Timer control D to allow the program to do one thing at a time at intervals

3: The form is displayed in two ways:

Mode form: Use the Showdailog () method to display a form as a modal form

Non-modal forms: Use the Show () method to display a form as a modal form

Implementing data updates for Windows programs