xltuo

    public void CloneObject()
        {
            //Get entity to be cloned
            var source = Context.ExampleRows.FirstOrDefault();

            //Create and add clone object to context before setting its values
            var clone = new ExampleRow();
            Context.ExampleRows.Add(clone);

            //Copy values from source to clone

xltuo

    public class ApplicationUser : IdentityUser
    {
        public string Name { get; set; }
        public int? Age { get; set; }
        public string Sex { get; set; }
        public string Desc { get; set; }

        public async Task<ClaimsIdentity> GenerateUserIdentityAsync(UserManager<ApplicationUser> manager)
        {
            // 请注意，authenticationType 必须与 CookieAuthenticationOptions.AuthenticationType 中定义的相应项匹配

xltuo

using System;
using System.Drawing;
using System.IO;
using System.Text.RegularExpressions;
using System.Windows.Forms;

class Program
{
    static string data = @"data:image/png;base64,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