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PODesign of method using ref to alter partially immutable class
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  1. PODesign of method using ref to alter partially immutable class
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    copied!<p>In my project I have a header class that represents a globally unique key for a piece of information inside the system, such as who it belongs to, what time it exists for, etc. Inside the same header class I also have fields for information that is specific to a given instance of data, such as who created this version of the information, when it was created, if its new data that needs to be saved to the database, etc.</p> <p>Here is an example of stocking some information into a data transport class and querying it back out.</p> <pre><code>var header = new IntvlDataHeader( datapoint: Guid.NewGuid(), element: Guid.NewGuid(), intervalUtc: DateTime.Now.Date); package.StockData_Decimal(header, 5m); decimal cloneData; package.TryGetData_Decimal(ref header, out cloneData); // header now refers to a different object, that could have different flags/information </code></pre> <p>Note how I made the TryGetData_Decimal pass the header variable by reference. IntvlDataHeader is a class, and if the data is found inside TryGetData then the reference is changed to point to a new instance of IntvlDataHeader that has the specific instance information in addition to having the same unique key information.</p> <p>Is combining a key with instance specific information and using a ref parameter as both in and out a bad design? Would the effort of splitting out another class so that there would be two out parameters and no ref parameters be better or avoid any potential problems?</p> <p>The signature of the method is <code>public bool TryGetData_Decimal(ref IntvlDataHeader header, out decimal data)</code></p>
 

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