未从表单识别器预置发票模型中获取行项目

Question

我已经使用这里的代码为预构建的发票模型https://docs.microsoft.com/en-us/azure/cognitive-services/form-recognizer/quickstarts/client-library?tabs=preview%2Cv2-1&pivots=programming-language-csharp#analyze-invoices提取了发票字段

但是，没有关于如何提取发票行项目的文档。我在这里看到这个功能是最近推出的，在2021年3月https://docs.microsoft.com/en-us/azure/cognitive-services/form-recognizer/whats-new

谁能指导我如何使用预建模型获得发票行项目？

Answer 1

请将Form Recognizer SDK NuGet更新到v3.1.0-beta.4版本以查看发票行项目。调用SDK并获取行项目详细信息的示例代码如下：

            FormRecognizerClient client = new FormRecognizerClient(new Uri(YOUR_FR_URL), new Azure.AzureKeyCredential(YOUR_FR_KEY));

            using (FileStream stream = new FileStream(@"SampleInvoice.pdf", FileMode.Open))
            {
                RecognizeInvoicesOptions options = new RecognizeInvoicesOptions() { IncludeFieldElements = true };
                var oper = await client.StartRecognizeInvoices(stream, options).WaitForCompletionAsync();
                var rawResponse = oper.GetRawResponse();
                rawResponse.ContentStream.Position = 0;
                using (var reader = new StreamReader(oper.GetRawResponse().ContentStream))
                {
                    Console.WriteLine($"Raw output:");
                    Console.WriteLine(reader.ReadToEnd());
                }

                foreach (var invoice in oper.Value)
                {
                    foreach (FormField field in invoice.Fields.Values)
                    {
                        Console.WriteLine($"Field {field.Name}: ");
                        Console.WriteLine($"    Value: {field.ValueData?.Text}");

                        if (field.Name == "Items")
                        {
                            var count = 0;
                            foreach (var lineField in field.Value.AsList())
                            {
                                count++;
                                Console.WriteLine($"     LineItem {count}: ");
                                foreach (var (lineFieldName, lineFieldValue) in lineField.Value.AsDictionary())
                                {
                                    Console.WriteLine($"        LineField: {lineFieldName}");
                                    Console.WriteLine($"            Value: {lineFieldValue.ValueData?.Text}");
                                }
                            }
                        }
                    }
                }
            }