.Net Core3.0 WEB API中使用FluentValidation验证(批量注入)

为什么要使用fluentvalidation

1.在日常的开发中，需要验证参数的合理性，不紧前端需要验证传毒的参数，后端也需要验证参数
2.在领域模型中也应该验证,做好防御性的编程是一种好的习惯（其实以前重来不写的，被大佬教育了一番）
3.fluentvalidation 是.net 开发的验证框架，开源,主要是简单好用，内置了一些常用的验证器，可以直接使用，扩展也很方便

使用fluentvalidation

1.引入fluentvalidation.aspnetcore nuget包
2.建立需要验证的类

/// <summary>
/// 创建客户
/// </summary>
public class createcustomerdto
{
  /// <summary>
  /// 客户姓名
  /// </summary>
  public string customername { get; set; }
  /// <summary>
  /// 客户年龄
  /// </summary>
  public string customerage { get; set; }
  /// <summary>
  /// 客户电话
  /// </summary>
  public string customerphone { get; set; }
  /// <summary>
  /// 客户地址
  /// </summary>
  public address customeraddress { get; set; }
}

/// <summary>
/// 验证
/// </summary>
public class createcustomerdtovalidator : abstractvalidator<createcustomerdto>
{
  public createcustomerdtovalidator()
  {
    rulefor(x => x.customername)
       .notempty()
       .withmessage("客户姓名不能为空");
    rulefor(x => x.customerphone)
       .notempty()
       .withmessage("客户电话不能为空");

  }
}

3.统一返回验证的信息，responseresult为全局统一参数返回的类

  /// <summary>
  /// 添加addfluentvalidationerrormessage
  /// </summary>
  /// <returns></returns>
  public dependencyinjectionservice addfluentvalidationerrormessage()
  {
    _services.configure<apibehavioroptions>(options =>
    {
      options.invalidmodelstateresponsefactory = (context) =>
      {
        var errors = context.modelstate
          .values
          .selectmany(x => x.errors
                .select(p => p.errormessage))
          .tolist();
        var result = new responseresult<list<string>>
        {
          statuscode = "00009",
          result = errors,
          message = string.join(",", errors.select(e => string.format("{0}", e)).tolist()),
          issucceed = false
        };

        return new badrequestobjectresult(result);
      };
    });
    return _dependencyinjectionconfiguration;
  }

4.注入验证的类

使用builder.registertype().as<ivalidator>();比较麻烦每次新增都需要添加一次注入
所以我们使用批量的注入，来减少麻烦,通过反射获取所有的验证的类批量注入

  /// <summary>
  /// 添加mvc
  /// </summary>
  /// <returns></returns>
  public dependencyinjectionservice addmvc()
  {
    _services.addcontrollers(options => 
    { 
      options.filters.add(typeof(loghelper));
    }).addjsonoptions(options =>
    {
      //忽略循环引用
      //options.jsonserializeroptions.ignorereadonlyproperties = true;
    }).addfluentvalidation(options =>
    {
      options.rundefaultmvcvalidationafterfluentvalidationexecutes = false;
      var validatorlist = getfluentvalidationvalidator("conferencewebapi");
      foreach (var item in validatorlist)
      {
        options.registervalidatorsfromassemblycontaining(item);
      }
    });
    return _dependencyinjectionconfiguration;
  }

  /// <summary>
  /// 获取所有的fluentvalidation validator的类
  /// </summary>
  public ienumerable<type> getfluentvalidationvalidator(string assemblyname)
  {
    if (assemblyname == null)
      throw new argumentnullexception(nameof(assemblyname));
    if (string.isnullorempty(assemblyname))
      throw new argumentnullexception(nameof(assemblyname));

    var implementassembly = runtimehelper.getassembly(assemblyname);
    if (implementassembly == null)
    {
      throw new dllnotfoundexception($"the dll conferencewebapi not be found");
    }
    var validatorlist = implementassembly.gettypes().where(e => e.name.endswith("validator"));
    return validatorlist;
  }

5.使用起来就十分简单了

  /// <summary>
  /// 创建客户
  /// </summary>
  /// <param name="input"></param>
  /// <returns></returns>
  [httppost]
  public async task<responseresult<string>> createcustomer([frombody] createcustomerdto input)
  {
    var createcustomercommand = new createcustomercommand(input.customername,input.customerage,input.customerphone,input.customeraddress);
    await _commandservice.sendcommandasync(createcustomercommand);
    var result = new responseresult<string>
    {
      issucceed = true,
      result = "创建客户成功！"
    };
    return result;
  }

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。