/// <summary>
/// Extracts the first inner SELECT from an IQueryable. Useful for building DataSelect expressions for Reporting
/// </summary>
/// <param name="qry">The qry.</param>
/// <param name="propertyExpression">The property expression.</param>
/// <param name="parameterName">Name of the parameter (forexample: 'p') from the qry to replace with the parameterExpression.</param>
/// <returns></returns>
public static Expression Extract( IQueryable qry, MemberExpression propertyExpression, string parameterName )
{
MethodCallExpression methodCallExpression = qry.Expression as MethodCallExpression;
Expression<Func<LambdaExpression>> executionLambda = Expression.Lambda<Func<LambdaExpression>>( methodCallExpression.Arguments[1] );
Expression extractedExpression = ( executionLambda.Compile().Invoke()).Body;
var propertyParameterExpressionVisitor = new PropertyParameterExpressionVisitor( propertyExpression, parameterName );
return propertyParameterExpressionVisitor.Visit( extractedExpression );
}
/// <summary>
/// Extracts the first inner SELECT from an IQueryable. Useful for building DataSelect expressions for Reporting
/// </summary>
/// <param name="qry">The qry.</param>
/// <param name="propertyExpression">The property expression.</param>
/// <param name="parameterName">Name of the parameter (forexample: 'p') from the qry to replace with the parameterExpression.</param>
/// <returns></returns>
public static Expression Extract(IQueryable qry, MemberExpression propertyExpression, string parameterName)
{
MethodCallExpression methodCallExpression = qry.Expression as MethodCallExpression;
Expression <Func <LambdaExpression> > executionLambda = Expression.Lambda <Func <LambdaExpression> >(methodCallExpression.Arguments[1]);
Expression extractedExpression = (executionLambda.Compile().Invoke()).Body;
var propertyParameterExpressionVisitor = new PropertyParameterExpressionVisitor(propertyExpression, parameterName);
return(propertyParameterExpressionVisitor.Visit(extractedExpression));
}