Resolution of control manipulation problems for C # child threads

Control actions on C # child threads

In general, a control operation on a form directly on a child thread can cause an exception. This is because the child threads and the threads running the form are different spaces, so it is not possible to manipulate the controls on the form in a child thread simply by using the control object name, but rather than not being able to operate, Microsoft provides Invoke method, whose function is to let the child thread tell the form thread to complete the corresponding control operation.

Now with a thread-controlled process bar to illustrate, the approximate steps are as follows:

1. Create an invoke function, roughly as follows:

///　<　summary>
///　Delegate　function　to　be　invoked　by　main　thread
///　<　/summary>
private　void　InvokeFun()
{
　　　　if(　prgBar.Value　<　　100　)
　　　　　　　　prgBar.Value　=　prgBar.Value　+　1;
}

2. C # Child thread entry function:

///　<　summary>
///　Thread　function　interface　　
///　<　/summary>

private

void
　ThreadFun()
{
　　　　//Create　invoke　method　by　specific　function
　　　　MethodInvoker　mi　=
new
　MethodInvoker(
this
.InvokeFun　);

for
(
int
　i　=　0;　i　<　　100;　i++　)
　　　　{

this
.BeginInvoke(　mi　);
　　　　　　　　Thread.Sleep(　100　);
　　　　}
}

3. To create a C # child thread:

Thread　thdProcess　=
new
　Thread(
new
　ThreadStart(　ThreadFun　)　);
thdProcess.Start();

Note:

using
　System.Threading;

private
　System.Windows.Forms.ProgressBar　prgBar;