Feed.cshtml

@inject HttpClient  Http

<div>
    @if (posts == null)
    {
        <p>Loading...</p>
    }
    else
    {
        foreach (var post in posts)
        {
            <Post Title="@post.Title">
                @post.Content
            </Post>
        }
    }
</div>

@functions {

[Parameter]
private string Filter { get; set; }

IEnumerable<FeedElement> posts;

protected override async Task OnInitAsync()
{
    await Load();
}

protected override async void OnParametersSet()
{
    await Load();
    this.StateHasChanged();
}

private async Task Load()
{
    posts = await GetData();
    if (!string.IsNullOrEmpty(Filter))
    {
        string filter = Filter.ToLower();
        posts = posts.Where(p => p.Title.ToLower().Contains(filter) || p.Content.ToLower().Contains(filter));
    }
}

private async Task<IEnumerable<FeedElement>> GetData()
{
    var data = await Http.GetJsonAsync<IEnumerable<FeedElement>>("sample-data/feed.json");
    return data;
}

public class FeedElement
{
    public string Title { get; set; }
    public string Content { get; set; }
}

}