ant-design-blazor/components/upload/UploadFileItem.cs

using System.Linq;
using System.Text.Json;

namespace AntDesign
{
    public class UploadFileItem
    {
        public string Id { get; set; }

        public string FileName { get; set; }

        public int Progress { get; set; }

        public string ObjectURL { get; set; }

        public string Url { get; set; }

        public string Response { get; set; }

        public UploadState State { get; set; }

        public long Size { get; set; }

        public string Ext { get; set; }

        public string Type { get; set; }

        public ResponseModel GetResponse<ResponseModel>(JsonSerializerOptions options = null) => JsonSerializer.Deserialize<ResponseModel>(this.Response, options);

        public bool IsPicture()
        {
            string[] imageTypes = new[] { ".jpg", ".png", ".gif", ".ico" };
            Ext = FileName.Substring(FileName.LastIndexOf('.'));
            return imageTypes.Contains(Ext);
        }
    }
}