"applicationUrl": "http://localhost:5001"

//WeatherForecastController.cs更改如下
using Microsoft.AspNetCore.Mvc;
namespace backend.Controllers
{
    [ApiController]
    [Route("[controller]")]
    public class WeatherForecastController : ControllerBase
    {
        private static readonly string[] Summaries = new[]
        {
            "Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching"
        };
        private readonly ILogger<WeatherForecastController> _logger;
        public WeatherForecastController(ILogger<WeatherForecastController> logger)
        {
            _logger = logger;
        }
        [HttpGet(Name = "GetWeatherForecast")]
        public IEnumerable<WeatherForecast> Get()
        {
            return Enumerable.Range(1, 5).Select(index => new WeatherForecast
            {
                Date = DateOnly.FromDateTime(DateTime.Now.AddDays(index)),
                TemperatureC = Random.Shared.Next(-20, 55),
                Summary = Summaries[Random.Shared.Next(Summaries.Length)]
            })
            .ToArray();
        }
        [HttpPost(Name = "Hello")]
        public object SayHello()
        {
            return new { message = "Hello" }; //这里返回必须是json对象，如果为字符串，则在daprClient.InvokeMethodAsync调用时会出错
        }
    }
}

dapr run --app-id backend --app-port 5001 dotnet run

dapr invoke --app-id backend --method WeatherForecast  
dapr invoke --app-id backend --method WeatherForecast --verb GET

"applicationUrl": "http://localhost:5002"

using Dapr.Client;
using Microsoft.AspNetCore.Mvc;
namespace front.Controllers
{
    [ApiController]
    [Route("[controller]")]
    public class WeatherForecastController : ControllerBase
    {
        [HttpPost(Name = "Hello")]
        public async Task<string> HelloAsync()
        {
            var appId = "backend";
            var methodName = "WeatherForecast";
            using (var daprClient = new DaprClientBuilder().Build())
            {
                try
                {
                    var result = await daprClient.InvokeMethodAsync<object>(HttpMethod.Post, appId, methodName);
                    Console.WriteLine(result);
                    return result.ToString();
                }
                catch (Exception ex)
                {
                    Console.WriteLine($"An exception occurred while invoking method: '{methodName}' on app-id: '{appId}'");
                    Console.WriteLine(ex.ToString());
                }
            }
            return "Error!";
        }
    }
}