ASP.NET WebAPI passing empty string in urlencoded body as null
I have a simple ApiController
public HttpResponseMessage Put(int orderid, [FromBody] Order order)
{
// Do something useful with order.Notes here
}
and a class (the actual class contains several more properties)
public class Order
{
public string Notes { get; set; }
}
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
Everything works fine, but empty values are passed as null
notes=blah // passes blah
notes= // Passes null
someothervalue=blah // Passes null
Is it possible to have ApiController distinguish between empty values and missing values?
您是否尝试使用DisplayFormatAttribute注释该属性，
public class Order
{
[DisplayFormat(ConvertEmptyStringToNull=false)]
public string Notes { get; set; }
}
The root of this comes from the ReplaceEmptyStringWithNull that calls string.IsNullOrWhiteSpace instead of string.IsNullOrEmpty
To fix this across your entire WebAPI project, you need to swap out the ModelMetadataProvider with one that sets the ConvertEmptyStringToNull to false
See Set default for DisplayFormatAttribute.ConvertEmptyStringToNull to false
This was actually "fixed" in v6 - see https://github.com/aspnet/Mvc/issues/3593
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