ASP.NET Core 2中的ModelBinder和日期

Question

我的网址中的所有日期都采用以下格式：dd-MM-yyyy。示例：31-12-2017

目前，我的Web API有这样的方法

[HttpGet]
public Task<IAsyncResult> GetSomething([FromQuery] date) 
{
    ...
}

问题是我的Web API似乎只适用于以美国英语格式化的日期。

• 像12-31-2017这样的日期将起作用。
• 而像31-12-2017这样的日期是行不通的。

如何将我的自定义数据格式从查询绑定到注入的参数？

Answer 1

我在startup.cs中为ASP核心2.0提交了这个

            services.Configure<RequestLocalizationOptions>(
            opts =>
            {
                var supportedCultures = new List<CultureInfo>
                {

                        new CultureInfo("en-GB"),
                        new CultureInfo("ar")
                };


                opts.DefaultRequestCulture = new RequestCulture("en-GB");
                // Formatting numbers, dates, etc.
                opts.SupportedCultures = supportedCultures;
                // UI strings that we have localized.
                opts.SupportedUICultures = supportedCultures;
                opts.DefaultRequestCulture = new RequestCulture(culture: "en-GB", uiCulture: "en-GB");


            });

这将使模型绑定接受格式dd / MM / yyyy

Answer 2

您可以使用自定义Model Binder来完成此任务。这是一个示例代码：

public class DateTimeModelBinder : IModelBinder
{
    private readonly IModelBinder baseBinder = new SimpleTypeModelBinder(typeof(DateTime));

    public Task BindModelAsync(ModelBindingContext bindingContext)
    {
        var valueProviderResult = bindingContext.ValueProvider.GetValue(bindingContext.ModelName);
        if (valueProviderResult != ValueProviderResult.None)
        {
            bindingContext.ModelState.SetModelValue(bindingContext.ModelName, valueProviderResult);

            var valueAsString = valueProviderResult.FirstValue;

            //  valueAsString will have a string value of your date, e.g. '31-12-2017'
            //  Parse it as you need and build DateTime object
            var dateTime = DateTime.ParseExact(valueAsString, "dd-MM-yyyy", CultureInfo.InvariantCulture);
            bindingContext.Result = ModelBindingResult.Success(dateTime);

            return Task.CompletedTask;
        }

        return baseBinder.BindModelAsync(bindingContext);
    }
}

[HttpGet]
public Task<IAsyncResult> GetSomething([FromQuery] [ModelBinder(typeof(DateTimeModelBinder))] date) 
{
    ...
}