WCF maxReceivedMessagesize and readerquotas

What is the fundamental difference between the tw开发者_运维问答o? On the server side on the service, I am using readerQuotas to accomodate large string lengths (Int32.MaxValue). What is the significance of maxReceivedMessagesize then?

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maxReceivedMessagesize is the total size of the message.

readerQuotas are the size of parts of the message for example the length of a string in the message.

You need both of them so be set high enough for your message to go through, often the defaults will be OK.