提问者:小点点

如何在网核 Web API 中以 dd-MM-yyyy 格式获取日期?


我在我的web API项目中使用net core 3.1。我已经创建了一个API,它接受来自用户的数据。默认情况下,项目中接受MM-dd-yyyy格式。但是我想接受dd-MM-yyyy格式的日期,并相应地验证所有日期。

下面是我的api:

    [HttpGet]
    public async Task<IActionResult> Get(DateTime fromDate, DateTime toDate)
    {
        return Ok();
    }

此外,我还有一些API,其中日期参数作为JSON在请求体中传递。我尝试了以下答案,但没有任何效果:

https://stackoverflow.com/a/58103218/11742476

当在请求体中传递日期时,上述解决方案起作用,但在URL中传递日期不起作用。

有没有其他方法可以让我做到这一点。?


共2个答案

匿名用户

您可以自定义日期时间格式的模型绑定器,如下所示:

1.DateTimeModelBinderProvider:

public class DateTimeModelBinderProvider : IModelBinderProvider
{
    public IModelBinder GetBinder(ModelBinderProviderContext context)
    {
        if (DateTimeModelBinder.SUPPORTED_TYPES.Contains(context.Metadata.ModelType))
        {
            return new BinderTypeModelBinder(typeof(DateTimeModelBinder));
        }

        return null;
    }
}

2.日期时间建模器:

public class DateTimeModelBinder : IModelBinder
{
    public static readonly Type[] SUPPORTED_TYPES = new Type[] { typeof(DateTime), typeof(DateTime?) };

    public Task BindModelAsync(ModelBindingContext bindingContext)
    {
        if (bindingContext == null)
        {
            throw new ArgumentNullException(nameof(bindingContext));
        }

        if (!SUPPORTED_TYPES.Contains(bindingContext.ModelType))
        {
            return Task.CompletedTask;
        }

        var modelName = GetModelName(bindingContext);

        var valueProviderResult = bindingContext.ValueProvider.GetValue(modelName);
        if (valueProviderResult == ValueProviderResult.None)
        {
            return Task.CompletedTask;
        }

        bindingContext.ModelState.SetModelValue(modelName, valueProviderResult);

        var dateToParse = valueProviderResult.FirstValue;

        if (string.IsNullOrEmpty(dateToParse))
        {
            return Task.CompletedTask;
        }

        var dateTime = Helper.ParseDateTime(dateToParse);

        bindingContext.Result = ModelBindingResult.Success(dateTime);

        return Task.CompletedTask;
    }

    private string GetModelName(ModelBindingContext bindingContext)
    {
        if (!string.IsNullOrEmpty(bindingContext.BinderModelName))
        {
            return bindingContext.BinderModelName;
        }

        return bindingContext.ModelName;
    }
}


public class Helper
{
    public static DateTime? ParseDateTime(
        string dateToParse,
        string[] formats = null,
        IFormatProvider provider = null,
        DateTimeStyles styles = DateTimeStyles.None)
    {
        var CUSTOM_DATE_FORMATS = new string[]
            {    
            //"MM-dd-yyyy",
            "yyyy-MM-dd",
            "dd-MM-yyyy"
            };

        if (formats == null || !formats.Any())
        {
            formats = CUSTOM_DATE_FORMATS;
        }

        DateTime validDate;

        foreach (var format in formats)
        {
            if (format.EndsWith("Z"))
            {
                if (DateTime.TryParseExact(dateToParse, format,
                         provider,
                         DateTimeStyles.AssumeUniversal,
                         out validDate))
                {
                    return validDate;
                }
            }

            if (DateTime.TryParseExact(dateToParse, format,
                     provider, styles, out validDate))
            {
                return validDate;
            }
        }
        return null;
    }
}

3.启动.cs:

services.AddControllers(option =>
{
     // add the custom binder at the top of the collection
     option.ModelBinderProviders.Insert(0, new DateTimeModelBinderProvider());
})

如果您仍想显示< code>dd-MM-yyyy格式的日期,请更改您的Startup.cs:

services.AddControllers(option =>
{
     option.ModelBinderProviders.Insert(0, new DateTimeModelBinderProvider());
}).AddJsonOptions(options =>
{
     options.JsonSerializerOptions.Converters.Add(new DateTimeConverter());
});

结果:

参考:

http://www.vickram.me/custom-datetime-model-binding-in-asp-net-core-web-api

更新:

您可以看到,您可以将< code>dd-MM-yyyy日期传递给操作,但是接收格式仍然和以前一样。这是由设计决定的,请参考:

https://docs.microsoft.com/en-us/aspnet/core/mvc/models/model-binding?view=aspnetcore-3.1#模型绑定、路由数据和查询字符串的全球化行为

匿名用户

您可以在序列化中添加JsonConverter

  public class DateTimeConverter : JsonConverter<DateTime>
{
    public override DateTime Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
    {
        return DateTime.Parse(reader.GetString());
    }

    public override void Write(Utf8JsonWriter writer, DateTime value, JsonSerializerOptions options)
    {
        writer.WriteStringValue(value.ToString("yyyy-MM-dd HH:mm"));
    }
}


static readonly JsonSerializerOptions JsonSerOpt = new()
    {
        Converters =
        {
            new DateTimeConverter()
        }
    };