/// <summary>
/// Creates an ObjectQuery from an expression.
/// </summary>
/// <param name="source">The source.</param>
/// <param name="expression">The expression.</param>
/// <param name="type">The type.</param>
/// <returns>An ObjectQuery created from the expression.</returns>
public static ObjectQuery CreateQuery(this IQueryable source, Expression expression, Type type)
{
// first convert to object query to get the correct provider
ObjectQuery sourceQuery = source.ToObjectQuery();
if (sourceQuery == null)
{
return(null);
}
IQueryProvider provider = ((IQueryable)sourceQuery).Provider;
// create query from expression using internal ObjectQueryProvider
dynamic providerProxy = new DynamicProxy(provider);
IQueryable expressionQuery = providerProxy.CreateQuery(expression, type);
if (expressionQuery == null)
{
return(null);
}
// convert back to ObjectQuery
ObjectQuery resultQuery = expressionQuery.ToObjectQuery();
return(resultQuery);
}