azure - 无法转换为类型 'system.collections.generic.IList'

Question

我正在尝试使用计算机视觉 .NET SDK 调用 Azure 认知计算机视觉服务 API 来分析图像。

我的代码如下:

List<VisualFeatureTypes> features1 = new List<VisualFeatureTypes>()
{
    VisualFeatureTypes.Categories, VisualFeatureTypes.Description,
    VisualFeatureTypes.Faces, VisualFeatureTypes.ImageType,
    VisualFeatureTypes.Tags, VisualFeatureTypes.Adult,
    VisualFeatureTypes.Color, VisualFeatureTypes.Brands,
    VisualFeatureTypes.Objects
};

ComputerVisionClient client =
    new ComputerVisionClient(new ApiKeyServiceClientCredentials(key))
    { Endpoint = endpoint};
ImageAnalysis results = await client.AnalyzeImageAsync(imageUrl, features1);

我收到以下错误消息:

cannot convert type'system.collections.generic.List<microsoft.azure.cognitiveservices.vision.computervision.models.visualfeaturetypes>'to type'system.collections.generic.IList<microsoft.azure.cognitiveservices.vision.computervision.models.visualfeaturetypes?>'.

有什么解决办法吗？

Answer 1

这是sample用于计算机视觉SDK，使用计算机视觉分析图像。

public static async Task<ImageAnalysis> AnalyzeImageAsync(this IComputerVisionClient operations, string url, IList<VisualFeatureTypes?> visualFeatures = default(IList<VisualFeatureTypes?>), IList<Details?> details = default(IList<Details?>), string language = default(string), IList<DescriptionExclude?> descriptionExclude = default(IList<DescriptionExclude?>), CancellationToken cancellationToken = default(CancellationToken))
            {
                using (var _result = await operations.AnalyzeImageWithHttpMessagesAsync(url, visualFeatures, details, language, descriptionExclude, null, cancellationToken).ConfigureAwait(false))
                {
                    return _result.Body;
                }
            }