The best replacement for datamember is datamemberattribute.

The best alternatives to datamember are rated as following:
★★★★★  datamemberattribute
★★★  messagebodymember
★★  enummember

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Speaking about datamember, one probably shouldn't forget about datacontract.

Other search terms related to datamember and their ratings are:
★★★★★ datacontract
You have in mind a companion for datamember and it is not yet here? Propose!



Google Trends

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datamember
datamemberattribute
messagebodymember