public override Expression Visit(Expression node)
{
if (node == null || ReduceToConstantVisitor.CanReduce(node))
{
return(base.Visit(node));
}
throw new NotSupportedException(string.Format("TODO: LOC: ReduceToConstantVisitor needs to handle {0}", node.GetType().Name));
}
public static bool IsWhereIdEqualsKey <TKey>(this Expression expression, out TKey key)
{
key = default(TKey);
LambdaExpression lambdaExpression = expression.FindLambdaExpression();
if (lambdaExpression != null)
{
BinaryExpression binaryExpression = lambdaExpression.Body as BinaryExpression;
if (binaryExpression != null && binaryExpression.NodeType == ExpressionType.Equal && binaryExpression.Left.Type == typeof(TKey) && binaryExpression.Right.Type == typeof(TKey) && binaryExpression.Left is MemberExpression && ReduceToConstantVisitor.CanReduce(binaryExpression.Right))
{
MemberExpression memberExpression = (MemberExpression)binaryExpression.Left;
MemberInfo member = memberExpression.Member;
if (memberExpression.Expression == lambdaExpression.Parameters[0] && member.MemberType == MemberTypes.Property && member.Name == "Id")
{
key = ReduceToConstantVisitor.Reduce <TKey>(binaryExpression.Right);
return(true);
}
}
}
return(false);
}