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Home/ Questions/Q 635085
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Editorial Team
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Editorial Team
Asked: May 13, 20262026-05-13T20:21:58+00:00 2026-05-13T20:21:58+00:00

Why do anonymous types not have property setters? var a = new { Text

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Why do anonymous types not have property setters?

var a = new { Text = "Hello" };
a.Text = "World"; //error
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  1. Editorial Team
    Editorial Team
    2026-05-13T20:21:58+00:00Added an answer on May 13, 2026 at 8:21 pm

    Anonymous types are immutable by design.

    Anonymous types are meant to hold values, and a type that represents a value should not be mutable.

    Also, it would make them unreliable in a dictionary, as the hashcode could change after creation.
    Many LINQ methods use Dictionaries, and, especially with delayed evaluation, LINQ with mutable types can lead to subtle mysterious bugs.

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