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Dictionary and a struct

Posted on 2013-01-16
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Last Modified: 2013-01-16
hi -- I'm using C# and VS2010 with .net 4.
i have a dictionary that i use to keep state information in my program. the value part of the key value pair is a struct (called "node"). it seems that i can only update "node" as a single entity rather than updating individual elements when i have fresh data. i have the additional problem of the data coming from two different threads. i set up the dictionary as static and use flags to protect the write operation. but every now and then (every couple hours) i get an enumeration error, which i suspect is related to the update process.
is there a better approach?
thanks,
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Question by:jdcoburn
4 Comments
 
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Accepted Solution

by:
käµfm³d   👽 earned 167 total points
ID: 38783859
Why don't you use the ConcurrentDictionary class?
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LVL 85

Assisted Solution

by:Mike Tomlinson
Mike Tomlinson earned 167 total points
ID: 38784128
"it seems that i can only update "node" as a single entity rather than updating individual elements when i have fresh data."

Switch from a struct to a class.
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LVL 29

Assisted Solution

by:anarki_jimbel
anarki_jimbel earned 166 total points
ID: 38784277
About structs, many people make the same mistake by forgetting that structures are value type. See more details here, e.g.:

http://stackoverflow.com/questions/7126318/how-do-you-assign-values-to-structure-elements-in-a-list-in-vb-net


Use class instead.

ConcurrentDictionary should be a good solution but I have a feeling that something else happens.
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Author Closing Comment

by:jdcoburn
ID: 38785087
thanks. all the solutions added value in different ways.<br />Jim
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