从IFormFile异常获取内存流

debugcn 发表于 Dev

奥菲尔·佩尔

我上传图片，并希望将其发送到第三方服务（Cloudinary）而不将文件保存在服务器中。

public async Task<List<string>> GetImagesUrlsByImage(IFormFile image)
{
    List<string> urlList = new List<string>();
    ImageUploadParams uploadParams = new ImageUploadParams();

    using (var memoryStream = new MemoryStream())
    {
        await image.CopyToAsync(memoryStream);
        uploadParams.File = new FileDescription(image.FileName, memoryStream);
        uploadParams.EagerTransforms = new List<Transformation>
        {
            new EagerTransformation().Width(200).Height(150).Crop("scale"),
            new EagerTransformation().Width(500).Height(200).Crop("scale")
        };

        ImageUploadResult result = await _cloudinary.UploadAsync(uploadParams);
        var url = result.SecureUrl.ToString();
        urlList.Add(url);
    }

    return urlList;
}

我没有收到异常，但是Cloudinary的结果消息中有一条错误消息：“ No image”;

在调试时，我看到以下错误：

我需要在此代码中解决什么？

内纳德

很有可能，假设其他一切正常，您只需要在以下位置重置光标的位置即可MemoryStream：

   ms.Position = 0;

如此完整的例子：

public async Task<List<string>> GetImagesUrlsByImage(IFormFile image)
{
    List<string> urlList = new List<string>();
    ImageUploadParams uploadParams = new ImageUploadParams();

    using (var memoryStream = new MemoryStream())
    {
        await image.CopyToAsync(memoryStream);

        ms.Position = 0; // set cursor to the beginning of the stream.

        uploadParams.File = new FileDescription(image.FileName, memoryStream);
        uploadParams.EagerTransforms = new List<Transformation>
        {
            new EagerTransformation().Width(200).Height(150).Crop("scale"),
            new EagerTransformation().Width(500).Height(200).Crop("scale")
        };

        ImageUploadResult result = await _cloudinary.UploadAsync(uploadParams);
        var url = result.SecureUrl.ToString();
        urlList.Add(url);
    }

    return urlList;
}

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