c Winform cross thread operation controls

Controls created by the main thread cannot be used directly in a child thread. You need to establish a delegate, write the ** of the operation of the main thread control in the delegate event, and call the main thread control of the delegate operation in the child thread.

Here's an example of writing::

public partial class form1 : form

thread thread=null;

int n = 0;

bool severisrun=false;It is used to show whether the thread is started or not.

private delegate void mydelegate(string str);Define the delegation.

private void setrich(string str) delegate.

if (mydelegate md = new mydelegate(;

new object

str;public form1()

initializecomponent();

private void run()

while(true)

setrich((n++)tostring())

private void button1_click(object sender, eventargs e)

if(!severisrun)

threadstart ts =new threadstart(run);

thread = new thread(ts);

severisrun=true;

private void button2_click(object sender, eventargs e)

if(severisrun)

severisrun=false;

private void form1_formclosing(object sender, formclosingeventargs e)

if(severisrun)

severisrun=false;

Delegated. private void delegate changechkboxstatedelegate();

If the private void changechkboxstate() method has a parameter, it must also have the same argument in the definition of the delegate above.

if(changechkboxstatedelegate newdelegate = new changechkboxstatedelegate();

new object{

Yes, add it to the form creation or load method.

false;

You can call the feast across the Zhiling Silver Thread, Wang Chun. Generally, Mini Programs can do this by playing by themselves.

UI elements in C are created by the main thread and can only be modified by the main thread that created them, because UI elements are not thread-safe by themselves, and multithreaded operations can cause unpredictable errors. So, by default, attempting to manipulate a UI element from a different thread throws an exception, although you can force cross-threaded operations of UI elements via the following:

checkforillegalcrossthreadcalls = false;

However, this is not recommended. In general, it is recommended for cross-threaded operations on UI elements.

method);

method, params object args);

The invoke method can be called by any thread, but will only execute the corresponding delegate on the main thread that created the form.

A minimal example is as follows:

private void button1_click(object sender, eventargs e)

private void threadaction()

private void uiaction()

Because the parameters of invoke include the delegate delegate, you need to define the corresponding delegate according to the parameters and return value of the method to invoke, and then you can call it. In the above example, the uiaction method has no parameters and no returns, so it directly uses the built-in delegate of methodinvoker.