.NET Core开发实战（第17课：为选项数据添加验证：避免错误配置的应用接收用户流量）--学习笔记

//services.Configure<OrderServiceOptions>(configuration);

services.AddOptions<OrderServiceOptions>().Configure(options =>
{
    configuration.Bind(options);
}).Validate(options =>
{
    return options.MaxOrderCount <= 100;
}, "MaxOrderCount 不能大于100");

services.AddOptions<OrderServiceOptions>().Configure(options =>
{
    configuration.Bind(options);
}).ValidateDataAnnotations();

public class OrderServiceOptions
{
[Range(30, 100)]
public int MaxOrderCount { get; set; } = 100;
}

public class OrderServiceValidateOptions : IValidateOptions<OrderServiceOptions>
{
    public ValidateOptionsResult Validate(string name, OrderServiceOptions options)
    {
        if (options.MaxOrderCount > 100)
        {
            return ValidateOptionsResult.Fail("MaxOrderCount 不能大于100");
        }
        else
        {
            return ValidateOptionsResult.Success;
        }
    }
}

services.AddOptions<OrderServiceOptions>().Configure(options =>
{
    configuration.Bind(options);
}).Services.AddSingleton<IValidateOptions<OrderServiceOptions>>(new OrderServiceValidateOptions( ));