在IdentityServer3中使用刷新令牌时获取NullReferenceException

Question

When refreshing my token using the IdentityModel client library....

var result = _tokenClient.RequestRefreshTokenAsync (refreshToken).Result;

I'm getting a NullReferenceException. This doesn't happen every time after getting an AccessToken and RefreshToken but only after the tokens are hours old. For example, I can get a AT and RT and consistently use the RT to get more AT and RT and it works fine. Let the code sit for a few hours and try to use the RT again and it throws the error. StackTrack is below. I would think if it was some sort of simple expiration issue I would have got a more graceful isError=true in the TokenResponse object.

at IdentityModel.Client.TokenClientExtensions.Merge (IdentityModel.Client.TokenClient client, System.Collections.Generic.Dictionary`2 explicitValues, System.Object extra) [0x00016] in <filename unknown>:0 
  at IdentityModel.Client.TokenClientExtensions.RequestRefreshTokenAsync (IdentityModel.Client.TokenClient client, System.String refreshToken, System.Object extra, CancellationToken cancellationToken) [0x00024] in <filename unknown>:0 
  at SellMore.Functions.RefreshToken (System.String refreshToken) [0x0001d] in /Users/darrell/Mono Projects/SellMore/SellMoreApp/SellMore/SellMore/Classes/Functions.cs:41 

Answer 1

愚蠢的问题，我的_tokenClient变量为nul