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Question by ina · Dec 20, 2011 at 01:03 PM · arraykeydictionaryarraylisthashtable

Default Null Value for Key Not Found in Dictionary?

Is it possible to set a default null value for a case where a key is not found in a dictionary or array?

KeyNotFoundException: The given key was not present in the dictionary. System.Collections.Generic.Dictionary`2[System.String,System.Int32].get_Item (System.String key)

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Answer by Statement · Dec 20, 2011 at 01:24 PM

use Dictionary.TryGetValue

 int result = 0;
 dict.TryGetValue("Foo", out result);

or

 int result = 0;
 if (!dict.TryGetValue("Foo", out result))
     result = 42; // Default value if we can't get it.

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avatar image Statement · Dec 20, 2011 at 01:26 PM 0
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With extension methods you can write a method that does this for you.. GetOrDefault("Foo"); or something.

avatar image ina · Dec 20, 2011 at 11:03 PM 0
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Extension $$anonymous$$ethods??

avatar image Statement · Dec 22, 2011 at 01:48 PM 0
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http://csharp.net-tutorials.com/csharp-3.0/extension-methods/

avatar image ina · Dec 25, 2011 at 06:21 PM 0
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hmm... not sure how to use extension methods exactly as there does not seem to be a way to pass the Dictionary as an argument in the method! http://answers.unity3d.com/questions/198749/passing-a-dictionary-as-function-arguments-in-c.html

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