How to Instantiate a Class from a Running Process in .NET

Discover how to easily `instantiate a class` from a running process in .NET using event handling and named pipes. Learn with clear examples!
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How to Instantiate a Class from a Running Process in .NET

In software development, it’s often the case that we need two applications to communicate and work together seamlessly. One common problem developers encounter is how to instantiate a class from a running process. In this guide, we explore how to achieve this in .NET Framework 4.8 while focusing on a practical example connecting two small programs.

The Scenario

Solution Overview

To approach this problem, we need to consider some communication methods between the two executables. In this explanation, we’ll look at two methods:

Using Event Handling for Simple Notifications

Using Named Pipes for Data Transmission

Both methods allow AnotherProggy to communicate with MyLittleProggy, but they vary in complexity and the type of data they can exchange.

Method 1: Using Event Handling for Notifications

In this method, MyLittleProggy will be notified each time AnotherProggy launches. Below is how you can implement this through a named event.

MyLittleProggy Code

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AnotherProggy Code

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Explanation

EventWaitHandle: This object allows one program (AnotherProggy) to signal another (MyLittleProggy) when it starts.

Set and Wait: namedEvent.Set() triggers the event, while MyLittleProggy waits for this signal.

Method 2: Using Named Pipes for Data Transmission

This method is more complex but can pass actual data from one program to another.

MyLittleProggy Code

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AnotherProggy Code

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Explanation

NamedPipeServerStream and NamedPipeClientStream: These classes allow MyLittleProggy and AnotherProggy to communicate through a pipe.

Sending and Receiving Data: AnotherProggy sends a message to MyLittleProggy, which reads and displays the data.

Conclusion

With the provided examples, you now have options to effectively instantiate a class from a running process in .NET. Whether you choose to use simple event notifications or named pipes for data transfer, the principle of inter-process communication remains the same.

Feel free to test these implementations, adapt them to your needs, and explore more complex communication patterns for your applications. Happy coding!