ASP.NET WebAPI在urlencoded主体中将空字符串传递为null [英] ASP.NET WebAPI passing empty string in urlencoded body as null

问题描述

我有一个简单的ApiController

I have a simple ApiController

public HttpResponseMessage Put(int orderid, [FromBody] Order order)
{
    // Do something useful with order.Notes here
}

和一个类(实际的类包含更多属性)

and a class (the actual class contains several more properties)

public class Order
{
    public string Notes { get; set; }
}

并希望处理以下类型的PUT请求

and wish to handle PUT requests of the following type

PUT http://localhost/api/orders/{orderid}
Content-Type: application/x-www-form-urlencoded

notes=sometext

一切正常，但是将空值传递为null

Everything works fine, but empty values are passed as null

notes=blah            // passes blah
notes=                // Passes null
someothervalue=blah   // Passes null

是否可以让ApiController区分空值和缺失值?

Is it possible to have ApiController distinguish between empty values and missing values?

推荐答案

您是否尝试过使用DisplayFormatAttribute注释属性，例如

Have you tried annotating the property with DisplayFormatAttribute, like,

public class Order
{
    [DisplayFormat(ConvertEmptyStringToNull=false)]
    public string Notes { get; set; }
}

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