话不多说直接上代码。

cs
using System;
using System.Threading.Tasks;

using Grpc.Core;
using Grpc.Core.Interceptors;

using Microsoft.AspNetCore.Authentication;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Logging;

public class GrpcTokenInterceptor : Interceptor
{
    const string ACCESS_TOKEN = "access_token";
    private readonly ILogger<GrpcTokenInterceptor> _logger;
    private readonly IHttpContextAccessor _contextAccessor;
    public GrpcTokenInterceptor(ILogger<GrpcTokenInterceptor> logger, IHttpContextAccessor contextAccessor)
    {
        _logger = logger ?? throw new ArgumentNullException(nameof(logger)); ;
        _contextAccessor = contextAccessor ?? throw new ArgumentNullException(nameof(contextAccessor));
    }

    public async Task<string?> GetTokenAsync() =>
        await _contextAccessor.HttpContext!.GetTokenAsync(ACCESS_TOKEN);

    ClientInterceptorContext<TRequest, TResponse> passToken<TRequest, TResponse>(
            ClientInterceptorContext<TRequest, TResponse> context
        ) where TRequest : class where TResponse : class
    {
        var token = GetTokenAsync().Result;
        if (token is not null)
        {
            var headers = context.Options.Headers;
            if (headers is null)
            {
                _logger.LogInformation("Header is null, create new one");
                 headers = new Metadata { { "Authorization", $"Bearer {token}" } };
                context = new ClientInterceptorContext<TRequest, TResponse>(
                    context.Method, context.Host, context.Options.WithHeaders(headers)
                );
            }
            else
            {
                headers.Add("Authorization", $"Bearer {token}");
            }
        }
        return context;
    }

    public override AsyncUnaryCall<TResponse> AsyncUnaryCall<TRequest, TResponse>(
        TRequest request,
        ClientInterceptorContext<TRequest, TResponse> context,
        AsyncUnaryCallContinuation<TRequest, TResponse> continuation)
    {
        context = passToken(context);
        var call = continuation(request, context);
        return new AsyncUnaryCall<TResponse>(
            call.ResponseAsync,
            call.ResponseHeadersAsync,
            call.GetStatus,
            call.GetTrailers,
            call.Dispose);
    }

}

需要在 Startup.cs中配置：

csharp
// ConfigureServices 中
services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();
services.AddTransient<GrpcTokenInterceptor>();
services.AddGrpcClient<Your.GrpcClient>(options => options.Address = "grpc url")
        .AddInterceptor<GrpcExceptionInterceptor>();