How Can I Efficiently Extract Property Names from Lambda Expressions?

Extracting Property Name from Lambda Expressions

When working with lambda expressions to access properties, obtaining the actual property name can be challenging. In this question, the caller wishes to improve upon an existing method that retrieves property names, handling both string and object-type properties.

The provided solution offers an enhanced method, GetPropertyInfo, which takes a lambda expression and returns the PropertyInfo object for the specified property. It verifies the expression to ensure it represents a property and throws exceptions if it refers to a method or field. Additionally, it checks that the property belongs to the type specified in the lambda expression's generic parameter.

Using this method, you can easily obtain the property name from a lambda expression, as shown in the example:

var propertyInfo = GetPropertyInfo(someUserObject, u => u.UserID);

This code fetches the property information for the UserID property of the User type, offering a more robust and type-safe approach for accessing property names when passed in via lambda expressions.

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