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Here's a simple wrapper class in C# for consuming a WCF API using the System.ServiceModel namespace. This example assumes you have already added a Service Reference to your project and generated the necessary client and data contract classes.

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To use this wrapper class, you would instantiate it, call the Connect method with the appropriate credentials, and then call the CallServiceMethod method with a lambda expression that invokes the desired method on the WCF service.

For example:

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I chose to use the CallServiceMethod approach instead of exposing the client object directly for a few reasons:

1. Encapsulation: By not exposing the client object directly, the wrapper class hides the implementation details and complexities of the WCF client, making it easier for consumers of the wrapper to interact with the WCF service.

2. Simplification: The CallServiceMethod function simplifies the process of calling a WCF service method by handling the opening and closing of the client connection, as well as error handling. This reduces the amount of boilerplate code needed when consuming the WCF service.

3. Consistency: By centralizing the connection management and error handling in the wrapper class, you ensure that all interactions with the WCF service follow the same pattern, making the code more consistent and easier to maintain.

4. Flexibility: If you ever need to change the underlying communication mechanism or switch to a different service technology, you can do so by modifying the wrapper class without affecting the code that consumes the wrapper. This improves the maintainability and adaptability of your code.

5. Resource management: The CallServiceMethod function ensures that the client connection is properly opened, closed, and disposed of after each method call, helping to prevent resource leaks and other issues that might arise from improper management of the client object.

By using the CallServiceMethod function, you create a clean and simple interface for interacting with the WCF service, making it easier to use and maintain.