Control the number of enabled threads

1. How to control the number of threads?

2. How to prevent multiple threads from downloading the same webpage?

3. How to Determine the end of a thread?

4. How to control the end of a thread?

Below are some solutions to these problems:

1. We can implement the number of threads through the for loop, just like the hitting program for beginners.

For example, if you know that you have specified N (an int variable) threads, you can use the following method to open five threads.

Thread [] downloadthread;
// The famous download thread. This is the advantage of C #, that is, the length of the array does not need to be specified during initialization. It can be specified only during use.
This should be a class level, which makes it possible for other method controls.
Threadstart startdownload = new threadstart (download );
// Thread start setting: that is, each thread executes download ()
Downloadthread = new thread [N]; // apply for resources for the thread and determine the total number of threads
For (INT I = 0; I <n; I ++) // enables the specified number of threads
{
Downloadthread [I] = new thread (startdownload); // specifies the thread start setting.
Downloadthread [I]. Start (); // enable threads one by one
}

Okay. Is it easy to implement control on the number of threads enabled?