LINQ to SQL Error: 'Could not find an implementation of the query pattern'—How Can I Fix It?

LINQ Query Error: Could Not Find Implementation

In a Silverlight application, a LINQ to SQL query against a "tblPersoon" table encounter the error "Could not find an implementation of the query pattern". This error is encountered when using (from...where...select) syntax.

Cause:

The error usually stems from two possible issues:

1. Missing LINQ namespace usage (using System.Linq)
2. The queried type does not implement IEnumerable

Solution:

1. Ensure Namespace Usage:

Add the necessary namespace:

using System.Linq;

2. Implement IEnumerable:

For type safety, LINQ requires that the queried object implements IEnumerable. If tblPersoon does not implement it, cast it to a type that does, such as:

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

Additional Considerations:

• Query the tblPersoons property instead of the type tblPersoon.
• Create an instance of the context (e.g., DataClasses1DataContext) and use it to retrieve the tblPersoons property.

Edited Solution:

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

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