create a search word method to scan a paragraph of text with a denounce in csharp

Hey there! It sounds like you want to create a search word method that can scan a paragraph of text with a debounced input in C#. Debouncing is a technique to avoid processing rapidly changing events like text input, and it can help us deliver a better user experience.

First off, let's define our search method that accepts a paragraph of text and a keyword to find:

main.cs
public List<int> SearchWordInParagraph(string paragraph, string keyword)
{
    var indices = new List<int>();
    for (int index = 0; ; index += keyword.Length)
    {
        index = paragraph.IndexOf(keyword, index);
        if (index == -1)
            return indices;
        indices.Add(index);
    }
}
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This method returns a list of indices where the keyword is found in the paragraph.

Next, we'll define a debounce method that will limit the rate at which a function can fire.

main.cs
public Func<Task> Debounce(Func<Task> func, int milliseconds)
{
    CancellationTokenSource cancellationTokenSource = new CancellationTokenSource();
    return async () =>
    {
        cancellationTokenSource?.Cancel();
        cancellationTokenSource = new CancellationTokenSource();
        try
        {
            await Task.Delay(milliseconds, cancellationTokenSource.Token);
            await func();
        }
        catch (TaskCanceledException)
        {
        }
    };
}
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The Debounce method takes a function and the number of milliseconds to debounce. It returns a new function that, when executed, will only execute the original function if the specified time has elapsed without any additional trigger requests.

Now let's utilize our debounce method to limit the number of search requests within a given time frame. Here's an example of how you would use it:

main.cs
async Task MainAsync()
{
    string paragraph = "Lorem ipsum dolor sit amet, consectetur adipiscing elit.";
    string keyword = "ipsum";

    var debouncedSearch = Debounce(() => PerformSearch(paragraph, keyword), 250);

    await debouncedSearch();
}

async Task PerformSearch(string paragraph, string keyword)
{
    var result = SearchWordInParagraph(paragraph, keyword);
    Console.WriteLine($"Keyword '{keyword}' found at indices: {string.Join(", ", result)}");
}
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In this example, the user types a keyword, and we debounce the search requests using the Debounce method. When the user stops typing for more than 250 milliseconds, the PerformSearch function is executed, which calls the SearchWordInParagraph method to look for the keyword in the paragraph.

And there you have it! You've created a search word method that scans a paragraph of text with a debounced input in C#.