Stream意外结束，该内容可能已被另一个组件读取. Microsoft.AspNetCore.WebUtilities.MultipartReaderStream [英] Unexpected end of Stream, the content may have already been read by another component. Microsoft.AspNetCore.WebUtilities.MultipartReaderStream

问题描述

当我尝试从请求中读取多部分内容时说一个内容可能已经被另一个组件读取的时候，我遇到了异常.

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);
                }
            }

推荐答案

原来，我不得不使用下面的属性来禁用表单值模型绑定.

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()

属性实现如下

[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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