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2012-06-14T13:43:13.163
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The any/all feature is only usable inside the filter expression and it is used to query based on related entities or collection properties. If you want to check just for existence of an employee without any relationship, you can do that without any/all. The idea is to simply filter all employees on the given condition and see if you get at least 1 result back. Now since you're doing this in Silverlight, the operation must be asynchronous, so a simple statement like above will not work. You could do something like: <pre><code>var query = (DataServiceQuery<Employee>)this.Context.Employees.Where(e => e.PersonalNr.ToLower() == personalNr.ToLower()).Take(1); query.BeginExecute((ar) => { var results = query.EndExecute(ar); // The usage of Any here is simply because it's the easiest way to do this // and it is not used over OData/WCF DS, this is simply checking if the results returned // from the service contain at least one result. bool employeeExists = results.Any(); }, null); </code></pre> Few notes about the code above: The WCF Data Services doesn't support the Equals method with comparison options and the OData protocol doesn't support case insensitive string comparison either. So to workaround that, simply convert all values to lower case before comparing. The Take(1) is used to only ask for the first value which matches the condition. Since we're only gonna use the existence of the result anyway, we don't need to ask the service for all the results (small optimization).
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1. POWCF DataService 5 Any on single Entity (Client-Side)
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1. USVitek Karas MSFT
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1. POWCF DataService 5 Any on single Entity (Client-Side)
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1. COThanks for your answer. I decided not to use your approach because my intention was to reduce the unnecessary traffic and therefore a ServiceOperation with a bool result (and not an entity) seems more plausible for me!
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 USStefan

Querying!

Guidance

A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.