Why Is My Silverlight LINQ Query Failing with 'Could Not Find an Implementation of the Query Pattern'?

Troubleshooting "Could Not Find an Implementation of the Query Pattern" in Silverlight LINQ

In Silverlight applications using LINQ to SQL, encountering the error "Could not find an implementation of the query pattern" can be frustrating. This article will guide you through the causes and solutions for this issue.

One common scenario that triggers this error is when the type you are attempting to query does not implement the IEnumerable interface. To resolve this, explicitly cast your type to IEnumerable using the Cast method. For instance:

var query = (from p in tblPersoon.Cast<Person>() select p).Single();

Another potential cause is neglecting to include the System.Linq namespace. Ensure that you have incorporated this namespace in your code using:

using System.Linq;

Additionally, if you are querying a property instead of a type (e.g., tblPersoons instead of tblPersoon), you may encounter this error. In such cases, you must obtain a context instance and use that to access the desired property. Here's an example:

public tblPersoon GetPersoonByID(string id)
{
    var context = new DataClasses1DataContext();
    var query = context.tblPersoons.Where(p => p.id == id).Single();
}

Following these steps should help you eliminate the "Could not find an implementation of the query pattern" error and enable you to execute your LINQ queries successfully in your Silverlight application.

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