由网友(мīss.ㄚou)分享简介：我目前在我的 Web api 中使用 Fluent Validation 而不是 Data Annotations 并在 API 文档中使用 swagger.流畅的验证规则没有反映在 swagger 模型中，因为我无法使用 swagger 模式过滤器配置流畅的验证规则.I am currently using Flu...

我目前在我的 Web api 中使用 Fluent Validation 而不是 Data Annotations 并在 API 文档中使用 swagger.流畅的验证规则没有反映在 swagger 模型中，因为我无法使用 swagger 模式过滤器配置流畅的验证规则.

I am currently using Fluent Validation instead of Data Annotations for my Web api and using swagger for API documentation. Fluent validation rules are not reflected in swagger model as i am unable to configure fluent validation rules with swagger schema filter.

这个博客有一个将它与 ASP.net MVC 一起使用的很好的解释.但我无法将其配置为在 ASP.net Core 中使用它.

This Blog has a good explanation for using it with ASP.net MVC. but i am unable to configure it to use it in ASP.net Core.

到目前为止，我已经尝试了以下代码，但无法获取验证器类型.

So far i have tried the following code but i am unable to get validator type.

services.AddSwaggerGen(options => options.SchemaFilter<AddFluentValidationRules>());

public class AddFluentValidationRules : ISchemaFilter
{
    public void Apply(Schema model, SchemaFilterContext context)
    {
        model.Required = new List<string>();
        var validator = GetValidator(type); // How?
        var validatorDescriptor = validator.CreateDescriptor();

        foreach (var key in model.Properties.Keys)
        {
            foreach (var propertyValidator in validatorDescriptor.GetValidatorsForMember(key))
            {
                 // Add to model properties as in blog
            }
        }
    }
}

推荐答案

经过搜索，我终于发现我需要 IValidationFactory 验证器实例.

After searching i have finally figured out that i needed to IValidationFactory for validator instance.

public class AddFluentValidationRules : ISchemaFilter
{
    private readonly IValidatorFactory _factory;

    /// <summary>
    ///     Default constructor with DI
    /// </summary>
    /// <param name="factory"></param>
    public AddFluentValidationRules(IValidatorFactory factory)
    {
        _factory = factory;
    }

    /// <summary>
    /// </summary>
    /// <param name="model"></param>
    /// <param name="context"></param>
    public void Apply(Schema model, SchemaFilterContext context)
    {

        // use IoC or FluentValidatorFactory to get AbstractValidator<T> instance
        var validator = _factory.GetValidator(context.SystemType);
        if (validator == null) return;
        if (model.Required == null)
            model.Required = new List<string>();

        var validatorDescriptor = validator.CreateDescriptor();
        foreach (var key in model.Properties.Keys)
        {
            foreach (var propertyValidator in validatorDescriptor
                .GetValidatorsForMember(ToPascalCase(key)))
            {
                if (propertyValidator is NotNullValidator 
                  || propertyValidator is NotEmptyValidator)
                    model.Required.Add(key);

                if (propertyValidator is LengthValidator lengthValidator)
                {
                    if (lengthValidator.Max > 0)
                        model.Properties[key].MaxLength = lengthValidator.Max;

                    model.Properties[key].MinLength = lengthValidator.Min;
                }

                if (propertyValidator is RegularExpressionValidator expressionValidator)
                    model.Properties[key].Pattern = expressionValidator.Expression;

                // Add more validation properties here;
            }
        }
    }

    /// <summary>
    ///     To convert case as swagger may be using lower camel case
    /// </summary>
    /// <param name="inputString"></param>
    /// <returns></returns>
    private static string ToPascalCase(string inputString)
    {
        // If there are 0 or 1 characters, just return the string.
        if (inputString == null) return null;
        if (inputString.Length < 2) return inputString.ToUpper();
        return inputString.Substring(0, 1).ToUpper() + inputString.Substring(1);
    }
}

并将此类添加到 swaggerGen 选项中

and add this class to swaggerGen options

options.SchemaFilter<AddFluentValidationRules>();