Why Does .NET's `Boolean.ToString()` Return Capitalized 'True' and 'False'?

Capitalization Discrepancy in Boolean.ToString Output

In .NET, the Boolean.ToString() method converts a boolean value to a string, returning "True" for true and "False" for false. This capitalization distinction raises questions, particularly in contexts where compatibility with XML or C#'s true/false keywords is crucial.

MSDN's Explanation

According to MSDN, Boolean.ToString() returns the constants "True" or "False" rather than the fields TrueString or FalseString. This method is not case-sensitive, unlike XML, which requires "true" and "false" as boolean values.

Unexpected Behavior

Despite the documentation stating that XML requires lowercase boolean values, the ToString() method returns capitalized values. This behavior can lead to compatibility issues and requires manual conversion using methods like ToLower() in XML applications.

Underlying Implementation

Adding to the confusion, Boolean.ToString(IFormatProvider) also exhibits peculiar behavior. The provider parameter is reserved and has no effect on the method's execution, making it essentially useless despite being a common practice in other provider-dependent methods.

Solution

The resolution to this discrepancy depends on the specific scenario. However, it typically involves deploying workarounds like the custom ToXmlString() method provided in the update section, which converts the Boolean value to lowercase before returning a string for XML use.

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