在program.cs中添加以下代码

var builder = WebApplication.CreateBuilder(args);
builder.Services.AddCors(options =>
{
    options.AddPolicy("AllowAllOrigins",
        builder =>
        {
            builder
                .AllowAnyMethod()
                .SetIsOriginAllowed(_ => true)
                .AllowAnyHeader()
                .AllowCredentials();
        });
});
var app = builder.Build();
app.UseCors("AllowAllOrigins");