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This article will explain in detail how to reflect the importance of VB.NET DoEvents, the content of the article is of high quality, so the editor will share it with you for reference. I hope you will have a certain understanding of the relevant knowledge after reading this article.

VB.NET programming language is used flexibly and widely, so it is deeply loved by the majority of programmers. However, it is not very easy to master the application skills of this language skillfully. Among them, the application of various functions is a more difficult bone.

There are many programmers who don't know VB.NET DoEvents. The DoEvents function temporarily returns the controller to the operating system and allows it to complete other events that may occur.

When the code of a program takes a long time to execute, such as in a complex mathematical calculation, you need to use VB.NET DoEvents. Calling the DoEvents function in the appropriate place in your code can change the response time of the program.

Here's an example: create a standard EXE file in VB and place a CommandButton and a TextBox, and then put the following code into CommandButton's click event handler:

Private Sub Command1_Click () Dim i As Long, j As Long For i = 1 To 100 Text1.Text = i For j = 1 To 100000 NextNext Text1.Text = "Done" End Sub

You can find that there is a nested loop in this program, and the loop will last a few seconds. Each time, the external loop repeatedly executes I

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Is displayed in the text box When the loop ends, the Done is also displayed.

What happened when you were running this program? However, text box will not change until Done shows

come out. The problem is that the system is very busy when executing the loop, and the I in the loop statement is displayed in the text box, which delays the windows queue. When the loop is complete, all requests are executed.

Now call VB.NET DoEvents at Text1.Text = I. When you run the program, you will find that text box writes down the value of I. Calling the DoEvents function frees up system memory to complete other requests, and then returns the controller to the VB program.

Although calling VB.NET DoEvents comes at the expense of speed, it is worth the cost of giving the program time to execute other events.

On how to reflect the importance of VB.NET DoEvents to share here, I hope that the above content can be of some help to you, can learn more knowledge. If you think the article is good, you can share it for more people to see.

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