Alex Frost
Alex Frost
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CC#
Created by Alex Frost on 1/31/2025 in #help
Issue sending parent Id through recursive function
I have a function that goes through provided nested enumerable with varying depth. It returns element that pass the given condition. I'm having issue with child elements to have I'd of the parent. For that, I am trying to pass Id of found valid element through the preceding recursion but it's having 0 for all the elements. 
internal static class FilterService
{
    internal static IEnumerable<TableElement> FilterStructureElements(
      IEnumerable<PdfStructureElement> elements,
      Func<PdfStructureElement, bool> predicate,
    int parentId = 0)
        {
            foreach (var element in elements)
            {
                // If the current element passes the predicate, yield it as a TableElement with the current parentId
                if (predicate(element))
                {
                    yield return element.ToTableElement(parentId);
                    parentId = element.Order;
                }
    
                // Recursively filter children, passing the current parentId to them
                foreach (var child in FilterStructureElements(element.ChildElements, predicate, parentId))
                {
                    yield return child;
                }
            }
        }
    }
  
internal static class FilterService
{
    internal static IEnumerable<TableElement> FilterStructureElements(
      IEnumerable<PdfStructureElement> elements,
      Func<PdfStructureElement, bool> predicate,
    int parentId = 0)
        {
            foreach (var element in elements)
            {
                // If the current element passes the predicate, yield it as a TableElement with the current parentId
                if (predicate(element))
                {
                    yield return element.ToTableElement(parentId);
                    parentId = element.Order;
                }
    
                // Recursively filter children, passing the current parentId to them
                foreach (var child in FilterStructureElements(element.ChildElements, predicate, parentId))
                {
                    yield return child;
                }
            }
        }
    }
  
10 replies
CC#
Created by Alex Frost on 8/22/2023 in #help
❔ Change datatype during program execution
I have following two properties: private ContextType ExportContext = 0; private List<T> SelectedItems { get; set; } = new(); During execution, value of ContextType can be changed by user only if SelectedItems is empty. Based on value of ExportContext, I want to change the datatype T. Is that possible?
10 replies
CC#
Created by Alex Frost on 8/9/2023 in #help
❔ Get list of indices from a List
I have a result set called "result". I want to use Linq to get a list of distinct items by name and their indices in the source resultset. How can I accomplish that?
27 replies
CC#
Created by Alex Frost on 4/13/2023 in #help
❔ Delayed call to a function
I am writing search in Blazor and the search needs to happen without enter or tab press. What I want is for a timer to be incremented on each key-press and once typing stops and delay is achieved, it should call the function. Few of the methods I tried call the search many times.
5 replies
CC#
Created by Alex Frost on 2/28/2023 in #help
❔ Adding OCR text to PDF file
I have PDF files with scanned pages. I want to keep source image without resizing it, performing OCR and adding OCR text to the file. What I have for now is, I use PdfSplitter which converts pages to images, upscaling them, then tesseract to OCR the images and construct a PDF file. Due to upscaling, the resulting file gains significant size and if OCR is performed multiple times due to un-desired results, the file keeps gaining size.
2 replies
CC#
Created by Alex Frost on 11/1/2022 in #help
Help with Implicit Explicit operators
This is my operator definition 
public static implicit operator EventViewModel(Entry e)
        {
            EventViewModel viewModel = new EventViewModel();
            viewModel.Id = e.Id;
            viewModel.Title = e.Title;
            viewModel.StartDate = e.DateStart;
            viewModel.EndDate = e.DateEnd;
            return viewModel;
        }
public static implicit operator EventViewModel(Entry e)
        {
            EventViewModel viewModel = new EventViewModel();
            viewModel.Id = e.Id;
            viewModel.Title = e.Title;
            viewModel.StartDate = e.DateStart;
            viewModel.EndDate = e.DateEnd;
            return viewModel;
        }
I've not been able to find the exacts. With this definition, will it convert from Entry to ViewModel or ViewModel to Entry? Because, with the said implementation, following conversion doesn't work: EventData = Context.Entries.Where(e => e.UserId == UserId); The error is Can't convert from IQueryable<Entry> to IQueryable<ViewModel>
12 replies
CC#
Created by Alex Frost on 10/11/2022 in #help
Pass DateTime.Add function as parameter
I have a switch statement that will call a generation function so I don't have to loop for every scenario: 
switch (E.RepMode)
{
    case "daily":
        repeats.Add(GenerateRepeats(entry.DateStart, entry.DateEnd, 1, DateTime.AddDays));
        break;
    case "weekly":
        break;
    case "monthly":
        break;
    case "yearly":
        break;
}
switch (E.RepMode)
{
    case "daily":
        repeats.Add(GenerateRepeats(entry.DateStart, entry.DateEnd, 1, DateTime.AddDays));
        break;
    case "weekly":
        break;
    case "monthly":
        break;
    case "yearly":
        break;
}
The function needs to be something like this: 
public List<EntryRepeat> GenerateRepeats(DateTime start, DateTime end, int interval, Func<double, DateTime> f)
{
    do
    {

    }
    while (true);
}
public List<EntryRepeat> GenerateRepeats(DateTime start, DateTime end, int interval, Func<double, DateTime> f)
{
    do
    {

    }
    while (true);
}
However I'm not able to pass the function being non-static. Is there a way to achieve this or a better approach?
8 replies