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如何在OWIN管道上的web api 2中接收多部分/表单数据

multipartform-data owin asp.net-web-api2 angularjs c#

RandomUs1r · 技术社区 · 7 年前

我是这样开始通话的:

Upload.upload({
                url: config.ApiUrl + 'Orders/CreateOrder',
                data: request
            }).then(function (response) {
                console.log('Success ' + response.config.data.file.name + 'uploaded. Response: ' + response.data);
            }, function (error) {
                $scope.errors = "Oops! Something went wrong... " + error.statusText;
            });

-----------------------------9623122368016
Content-Disposition: form-data; name="somefield"

Some Value
-----------------------------9623122368016
Content-Disposition: form-data; name="errorMessage"

null
-----------------------------9623122368016
Content-Disposition: form-data; name="success"

false
-----------------------------9623122368016
Content-Disposition: form-data; name="file"; filename="imapdf.pdf"
Content-Type: application/pdf

%PDF-1.2
1 0 obj 
<<
/Producer()
/Author()
/Title()
/Subject()
/Keywords()
/CreationDate(D:20040106)
/ModDate(D:20040106)
/Creator()
>> 
endobj
2 0 obj 
<<
/Type/XObject
/Subtype/Image
/Name/wpt1
/Width 41
/Height 15
/BitsPerComponent 8
/ColorSpace/DeviceRGB
/Length 100
/Filter [/FlateDecode] >>
stream
xsqH0s

我无法访问 HttpContext.Current.Request.Files 因为我正在使用OWIN管道,在 Request.Content.ReadAsMultipartAsync

我如何接收我的文件&它是web api 2中的关联表单数据?

C代码更新:

public Task<OrderRequest> CreateOrder(OrderRequest orderRequest)
{
    try
    {
        var asdf = OwinHttpRequestMessageExtensions.GetOwinContext(Request);
        if (!Request.Content.IsMimeMultipartContent("multipart/form-data"))
        {
            var provider = new MultipartMemoryStreamProvider();
            this.Request.Content.ReadAsMultipartAsync(provider);

            var content = provider.Contents.First();
            var buffer = content.ReadAsByteArrayAsync();
        }

        var test = orderRequest;
        var a = HttpContext.Current.Request.Files;
    }
    catch (Exception ex)
    {
        throw ex;
    }

    return Task.FromResult<OrderRequest>(null);
}

1 回复 | 直到 7 年前

Kirk Larkin 7 年前

顾名思义, ReadAsMultipartAsync 是一个作用因为你没有在等电话,所以你很可能会遇到这样的情况:你试图访问 Contents 在填充之前。

要解决此问题,您可以更新 CreateOrder

public async Task<OrderRequest> CreateOrder(OrderRequest orderRequest)
{
    ...
    await this.Request.Content.ReadAsMultipartAsync(provider);
    ...
}

这里所改变的只是增加了 async 之前 Task<OrderRequest> await 之前 this.Request.Content.ReadAsMultipartAsync(provider); . 您还需要添加 等候 之前 content.ReadAsByteArrayAsync(); 出于同样的原因,然后你可以 return null Task.FromResult 最后。

事实上,以下是这些更改的全部代码:

public async Task<OrderRequest> CreateOrder(OrderRequest orderRequest)
{
    try
    {
        var asdf = OwinHttpRequestMessageExtensions.GetOwinContext(Request);
        if (!Request.Content.IsMimeMultipartContent("multipart/form-data"))
        {
            var provider = new MultipartMemoryStreamProvider();
            await this.Request.Content.ReadAsMultipartAsync(provider);

            var content = provider.Contents.First();
            var buffer = await content.ReadAsByteArrayAsync();
        }

        var test = orderRequest;
        var a = HttpContext.Current.Request.Files;
    }
    catch (Exception ex)
    {
        throw ex;
    }

    return null;
}