I get an exception when I try to read multi part content from the request saying the content may have already been read by another component.
if (MultipartRequestHelper.IsMultipartContentType(Request.ContentType))
{
// Used to accumulate all the form url encoded key value pairs in the
// request.
var formAccumulator = new KeyValueAccumulator();
var boundary = Request.GetMultipartBoundary();
var reader = new MultipartReader(boundary, HttpContext.Request.Body);
var section = await reader.ReadNextSectionAsync();
while (section != null)
{
ContentDispositionHeaderValue contentDisposition;
var hasContentDispositionHeader =
ContentDispositionHeaderValue.TryParse(section.ContentDisposition, out contentDisposition);
}
}
In asp.net core 3, You have to add factories.RemoveType<FormFileValueProviderFactory>();
to your DisableFormValueModelBindingAttribute
attribute.
Code
[AttributeUsage(AttributeTargets.Class | AttributeTargets.Method)]
public class DisableFormValueModelBindingAttribute : Attribute, IResourceFilter
{
public void OnResourceExecuting(ResourceExecutingContext context)
{
var factories = context.ValueProviderFactories;
factories.RemoveType<FormValueProviderFactory>();
factories.RemoveType<FormFileValueProviderFactory>();
factories.RemoveType<JQueryFormValueProviderFactory>();
}
public void OnResourceExecuted(ResourceExecutedContext context)
{
}
}
Documentation
It turns out that I had to disable form value model binding by using the attribute below.
[HttpPost]
[Route("")]
[DisableFormValueModelBinding]
public async Task<IActionResult> Post()
The attribute implementation is below
[AttributeUsage(AttributeTargets.Class | AttributeTargets.Method)]
public class DisableFormValueModelBindingAttribute : Attribute, IResourceFilter
{
public void OnResourceExecuting(ResourceExecutingContext context)
{
var factories = context.ValueProviderFactories;
factories.RemoveType<FormValueProviderFactory>();
factories.RemoveType<JQueryFormValueProviderFactory>();
}
public void OnResourceExecuted(ResourceExecutedContext context)
{
}
}
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