src/Library/NetPro.Web.Api/Extensions/Extensions.Identity.cs

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using Microsoft.AspNetCore.Http;
using System.Collections.Generic;
using System.Globalization;
using System.Security.Claims;
using System.Security.Principal;

namespace System.NetPro
{
    /// <summary>
    /// IdentityExtensions
    /// </summary>
    public static partial class Extensions
    {
        //
        // 摘要:
        //     Unique Identifier for the End-User at the Issuer.
        private const string Subject = "sub";

        //
        // 摘要:
        //     The role
        private const string Role = "role";
        /// <summary>
        /// 
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="identity"></param>
        /// <returns></returns>
        /// <exception cref="ArgumentNullException"></exception>
        public static T GetUserId<T>(this IIdentity identity) where T : IConvertible
        {
            if (identity == null)
            {
                throw new ArgumentNullException("identity");
            }
            if (identity is ClaimsIdentity claimsIdentity)// 等价于 ClaimsIdentity claimsIdentity = identity as ClaimsIdentity;
            {
                Claim claim = claimsIdentity.FindFirst(r => r.Type == ClaimTypes.NameIdentifier);
                string claimValue;
                if (claim == null)
                {
                    claimValue = identity.GetClaimValue(Subject);
                }
                else
                {
                    claimValue = claim.Value;
                }
                if (string.IsNullOrWhiteSpace(claimValue))
                {
                    claimValue = "0";
                }
                return (T)Convert.ChangeType(claimValue, typeof(T), CultureInfo.InvariantCulture);
            }
            return default(T);
        }

        /// <summary>
        /// 获取用户角色名称
        /// </summary>
        /// <param name="identity"></param>