ASP.NET Core 1(RTM)中的自定义DateTime模型绑定程序 [英] Custom DateTime model binder in ASP.NET Core 1 (RTM)

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本文介绍了ASP.NET Core 1(RTM)中的自定义DateTime模型绑定程序的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我正在编写ASP.NET Core 1应用程序,该应用程序具有Web API控制器,供供应商在其中发布数据.

I'm writing and ASP.NET Core 1 application, which has a Web API Controller where supplier will post data.

这是Model类的简化版本,我将绑定传入的数据:

This is a simplified version of the Model class to which I will bind the incoming data:

public class Lead
{
    public int SupplierId { get; set; }
    public DateTime Date { get; set; }
}

问题在于日期将以德语格式发布,例如30.09.2016.我不想将应用程序的全球文化设置为de-DE,因为a)我不是德语,并且b)应用程序的其余部分都可以使用ISO日期.

The problem is that the dates will be posted with German formatting, for instance, 30.09.2016. I do not want to set the global culture of the application to de-DE because a) I'm not German, and b) the rest of the application will work with ISO dates.

我已设置为编写自定义IModelBinder,并且,因为它在ASP.NET Core MVC中显然是必需的,所以它是IModelBinderProvider.

I've set to write a custom IModelBinder and, because it's apparently obligatory in ASP.NET Core MVC, an IModelBinderProvider.

这是我对IModelBinderProvider的实现:

public class GermanDateTimeModelBinderProvider : IModelBinderProvider
{
    public IModelBinder GetBinder(ModelBinderProviderContext context)
    {
        if (context == null)
            throw new ArgumentNullException(nameof(context));

        if (!context.Metadata.IsComplexType && 
                context.Metadata.ModelType == typeof(DateTime))
            return new GermanDateTimeBinder();

        return null;
    }
}

问题是我的IModelBinderProvider仅在Lead类(即context.Metadata.ModelType == typeof(Lead))上被击中.

The problem is that my IModelBinderProvider is only being hit for the Lead class, i.e., context.Metadata.ModelType == typeof(Lead).

我希望模型联编程序看到我们没有处理DateTime,继续前进,然后然后返回 Lead类的每个属性.
显然不是这种情况,我的自定义IModelBinder从未被点击.

I would expect the model binder to see that we're not dealing with a DateTime, move on, and then come back for every property of the Lead class.
This is apparently not the case, and my custom IModelBinder never get hit.

我说IModelBinderProvider似乎是强制性的原因不是因为我没有找到直接将IModelBinder注册到MVC管道中的方法.我已经注册了IModelBinderProvider:

The reason I say that IModelBinderProvider appears to be obligatory no is that I've found no way of directly registering an IModelBinder into the MVC pipeline; I have to register an IModelBinderProvider instead:

public void ConfigureServices(IServiceCollection services)
{
    // Add framework services.
    services.AddMvc(options =>
    {
        options.ModelBinderProviders.Insert(0, new GermanDateTimeModelBinderProvider());
    });
}

如何获取ASP.NET Core MVC将自定义的DateTime绑定程序应用于Lead类的Date属性?

How can I get ASP.NET Core MVC to apply my custom DateTime binder to the Date property of the Lead class? Is there maybe a way to skip the whole IModelBinderProvider business and use just an IModelBinder?

推荐答案

您是否将值发布为JSON? 如果是这样,我建议您向JSON.NET注册一个自定义JsonConverter. 在转换器中,您将使用具有不同DateFormatString的JsonSerializer,在这种情况下为德语日期格式. 所有其他JsonSerializer都不受此影响.

Do you post your values as JSON? If so, I'd suggest you register a custom JsonConverter with JSON.NET. In the converter you'll use a JsonSerializer with a different DateFormatString, in this case a German date format. All other JsonSerializer aren't affected by this.

public class Startup
{
    public void ConfigureServices(IServiceCollection services)
    {
        services
        .AddMvc()
        .AddJsonOptions(option =>
        {
            option.SerializerSettings.Converters.Add(new LeadConverter());
        });
    }

    public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
    {
        loggerFactory.AddDebug();

        app.UseMvcWithDefaultRoute();
    }
}

public class LeadConverter : JsonConverter
{
    public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
    {
        throw new System.NotImplementedException();
    }

    public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
    {
        var jsonSerializer = new JsonSerializer
        {
            DateFormatString = "dd.MM.yyyy"
        };

        return jsonSerializer.Deserialize<Lead>(reader);
    }

    public override bool CanConvert(Type objectType) => objectType == typeof(Lead);
}

这篇关于ASP.NET Core 1(RTM)中的自定义DateTime模型绑定程序的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

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