asp.net web api - how to cast Edm.Guid to Edm.String in odata -

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how cast guid string in odata, have tried $filter=(startswith(cast(customerid, 'edm.string'),'1')) throws exception unknown function 'cast'.

to perform cast, type shouldn't in quotes. should be:

$filter=startswith(cast(customerid, edm.string),'1')

(i removed brackets)


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