添加项目文件。

TechHelper.Client/HttpRepository/RefreshTokenService.cs

@@ -0,0 +1,34 @@
+using Microsoft.AspNetCore.Components.Authorization;
+
+namespace TechHelper.Client.HttpRepository
+{
+	public class RefreshTokenService
+	{
+		private readonly AuthenticationStateProvider _authenticationStateProvider;
+		private readonly IAuthenticationClientService _authenticationClientService;
+
+		public RefreshTokenService(AuthenticationStateProvider authenticationStateProvider, IAuthenticationClientService authenticationClientService)
+		{
+			_authenticationStateProvider = authenticationStateProvider;
+			_authenticationClientService = authenticationClientService;
+		}
+
+		public async Task<string> TryRefreshToken()
+		{
+			var authState = await _authenticationStateProvider.GetAuthenticationStateAsync();
+			var user = authState.User;
+			var expClaim = user.FindFirst(c => c.Type.Equals("exp")).Value;
+			var expTime = DateTimeOffset.FromUnixTimeSeconds(
+				Convert.ToInt64(expClaim));
+
+			var diff = expTime - DateTime.UtcNow;
+			if (diff.TotalMinutes <= 2)
+				return await _authenticationClientService.RefreshTokenAsync();
+
+			return string.Empty;
+		}
+
+
+
+	}
+}