This topic describes how to use Content Moderation SDK for .NET to moderate images for risky content.

Background information

Content Moderation SDK for .NET supports both synchronous and asynchronous image moderation.

  • If you use synchronous image moderation, the moderation results are returned in real time. For more information about the parameters, see Synchronous moderation.
  • If you use asynchronous image moderation, you must poll the moderation results or configure a callback notification to receive the moderation results. For more information about the parameters, see Asynchronous moderation.

You can submit the URL of an online image, the URL of a local image, or a binary image stream for image moderation.

Prerequisites

The dependencies for Content Moderation SDK for .NET are installed. For more information about how to install the dependencies, see Installation.
Note You must use the required versions of the dependencies described in the Installation topic. Otherwise, subsequent operation calls fail.

Submit synchronous image moderation tasks (Recommended)

Operation Description Supported region
ImageSyncScanRequest Sends synchronous requests to moderate images for risky content in multiple moderation scenarios, including pornography, terrorist content, ad, QR code, undesirable scene, and logo detection.
  • cn-shanghai: China (Shanghai)
  • cn-beijing: China (Beijing)
  • cn-shenzhen: China (Shenzhen)
  • ap-southeast-1: Singapore (Singapore)
Sample code
using System;
using Newtonsoft.Json;
using Aliyun.Acs.Core;
using Aliyun.Acs.Core.Http;
using Aliyun.Acs.Core.Profile;
using Aliyun.Acs.Green.Model.V20180509;
using System.Collections.Generic;

namespace csharp_sdk_sample
{
    class Program
    {
        static void Main(string[] args)
        {
            // Use the AccessKey ID and AccessKey secret of your Alibaba Cloud account. 
            IClientProfile profile = DefaultProfile.GetProfile(
                "cn-shanghai",
                "Your AccessKey ID",
                "Your AccessKey secret");
            DefaultAcsClient client = new DefaultAcsClient(profile);

            ImageSyncScanRequest request = new ImageSyncScanRequest();
            request.AcceptFormat = FormatType.JSON;
            request.ContentType = FormatType.JSON;
            request.Method = MethodType.POST;
            request.Encoding = "UTF-8";

            Dictionary<string, object> task1 = new Dictionary<string, object>();
            task1.Add("dataId", "ID of the image to be moderated");
            task1.Add("url", "URL of the image to be moderated");

            Dictionary<string, object> httpBody = new Dictionary<string, object>();
            // scenes: the moderation scenarios. You can specify one or more moderation scenarios. 
            httpBody.Add("scenes", new List<string> { "porn", "terrorism" });
            httpBody.Add("bizType", "Business scenario");
            httpBody.Add("tasks", new List<Dictionary<string, object>> { task1 });

            request.SetContent(System.Text.Encoding.Default.GetBytes(JsonConvert.SerializeObject(httpBody)), "utf-8", FormatType.JSON);
            try
            {
                ImageSyncScanResponse response = client.GetAcsResponse(request);
                if (response.HttpResponse.Status != 200)
                {
                    Console.WriteLine("the request failed. status:{0}", response.HttpResponse.Status);
                }
                Console.WriteLine(System.Text.Encoding.Default.GetString(response.HttpResponse.Content));
            }
            catch (Exception ex)
            {
                Console.WriteLine("Failed with error info: {0}", ex.Message);
            }
        }
    }
}

Submit asynchronous image moderation tasks

This section shows you how to use Content Moderation SDK for .NET to submit asynchronous image moderation tasks. When you submit a request, you can configure a callback notification to receive the moderation results. Alternatively, you can call the ImageAsyncScanResultsRequest operation to poll the moderation results.

Same as synchronous image moderation, you can submit the URL of an online image, the URL of a local image, or a binary image stream for asynchronous image moderation. In this example, the URL of an online image is used.

Operation Description Supported region
ImageAsyncScanRequest Sends asynchronous requests to moderate images for risky content in multiple moderation scenarios, including pornography, terrorist content, ad, QR code, undesirable scene, and logo detection.
  • cn-shanghai: China (Shanghai)
  • cn-beijing: China (Beijing)
  • cn-shenzhen: China (Shenzhen)
  • ap-southeast-1: Singapore (Singapore)
Sample code
using System;
using Newtonsoft.Json;
using Aliyun.Acs.Core;
using Aliyun.Acs.Core.Http;
using Aliyun.Acs.Core.Profile;
using Aliyun.Acs.Green.Model.V20180509;
using System.Collections.Generic;

namespace csharp_sdk_sample
{
    class Program
    {
        static void Main(string[] args)
        {
            // Use the AccessKey ID and AccessKey secret of your Alibaba Cloud account. 
            IClientProfile profile = DefaultProfile.GetProfile(
                "cn-shanghai",
                "Your AccessKey ID",
                "Your AccessKey secret");
            DefaultAcsClient client = new DefaultAcsClient(profile);

            ImageAsyncScanRequest request = new ImageAsyncScanRequest();
            request.AcceptFormat = FormatType.JSON;
            request.ContentType = FormatType.JSON;
            request.Method = MethodType.POST;
            request.Encoding = "UTF-8";

            Dictionary<string, object> task1 = new Dictionary<string, object>();
            task1.Add("dataId", "ID of the image to be moderated");
            task1.Add("url", "URL of the image to be moderated");

            Dictionary<string, object> httpBody = new Dictionary<string, object>();
            // scenes: the moderation scenarios. You can specify one or more moderation scenarios. 
            httpBody.Add("scenes", new List<string> { "porn", "terrorism" });
            httpBody.Add("bizType", "Business scenario");
            httpBody.Add("tasks", new List<Dictionary<string, object>> { task1 });

            request.SetContent(System.Text.Encoding.Default.GetBytes(JsonConvert.SerializeObject(httpBody)), "utf-8", FormatType.JSON);
            try
            {
                ImageAsyncScanResponse response = client.GetAcsResponse(request);
                if (response.HttpResponse.Status != 200)
                {
                    Console.WriteLine("the request failed. status:{0}", response.HttpResponse.Status);
                }
                Console.WriteLine(System.Text.Encoding.Default.GetString(response.HttpResponse.Content));
            }
            catch (Exception ex)
            {
                Console.WriteLine("Failed with error info: {0}", ex.Message);
            }
        }
    }
}

Query the results of asynchronous image moderation

Operation Description Supported region
ImageAsyncScanResultsRequest Queries asynchronous image moderation results. You can query the moderation results of multiple asynchronous image moderation tasks at a time.
  • cn-shanghai: China (Shanghai)
  • cn-beijing: China (Beijing)
  • cn-shenzhen: China (Shenzhen)
  • ap-southeast-1: Singapore (Singapore)
Sample code
using System;
using Newtonsoft.Json;
using Aliyun.Acs.Core;
using Aliyun.Acs.Core.Http;
using Aliyun.Acs.Core.Profile;
using Aliyun.Acs.Green.Model.V20180509;
using System.Collections.Generic;

namespace csharp_sdk_sample
{
    class Program
    {
        static void Main(string[] args)
        {
            // Use the AccessKey ID and AccessKey secret of your Alibaba Cloud account. 
            IClientProfile profile = DefaultProfile.GetProfile(
                 "cn-shanghai",
                 "Your AccessKey ID",
                 "Your AccessKey secret");
            DefaultAcsClient client = new DefaultAcsClient(profile);

            ImageAsyncScanResultsRequest request = new ImageAsyncScanResultsRequest();
            request.AcceptFormat = FormatType.JSON;
            request.ContentType = FormatType.JSON;
            request.Method = MethodType.POST;
            request.Encoding = "UTF-8";

            List<string> taskIdList=new List<string> { "ID of the asynchronous image moderation task"};

            request.SetContent(System.Text.Encoding.Default.GetBytes(JsonConvert.SerializeObject(taskIdList)), "utf-8", FormatType.JSON);
            try
            {
                ImageAsyncScanResultsResponse response = client.GetAcsResponse(request);


                if (response.HttpResponse.Status != 200)
                {
                    Console.WriteLine("the request failed. status:{0}", response.HttpResponse.Status);
                }
                Console.WriteLine(System.Text.Encoding.Default.GetString(response.HttpResponse.Content));
            }
            catch (Exception ex)
            {
                Console.WriteLine("Failed with error info: {0}", ex.Message);
            }
        }
    }
}

Give feedback on moderation results

If the results of image moderation are not as expected, you can call the ImageScanFeedbackRequest operation to modify the results. Content Moderation adds the moderated image to the similar image blacklist or whitelist based on your feedback. When you submit a similar image for moderation, Content Moderation returns moderation results based on the label in your feedback.

For more information, see Give feedback on moderation results.

Operation Description Supported region
ImageScanFeedbackRequest Provides feedback on image moderation results and modifies the machine-assisted moderation results based on the feedback.
  • cn-shanghai: China (Shanghai)
  • cn-beijing: China (Beijing)
  • cn-shenzhen: China (Shenzhen)
  • ap-southeast-1: Singapore (Singapore)
Sample code
using System;
using Newtonsoft.Json;
using Aliyun.Acs.Core;
using Aliyun.Acs.Core.Http;
using Aliyun.Acs.Core.Profile;
using Aliyun.Acs.Green.Model.V20180509;
using System.Collections.Generic;

namespace csharp_sdk_sample
{
    class Program
    {
        static void Main(string[] args)
        {
            // Use the AccessKey ID and AccessKey secret of your Alibaba Cloud account. 
            IClientProfile profile = DefaultProfile.GetProfile(
                "cn-shanghai",
                "Your AccessKey ID",
                "Your AccessKey secret");
            DefaultAcsClient client = new DefaultAcsClient(profile);

            ImageScanFeedbackRequest request = new ImageScanFeedbackRequest();
            request.AcceptFormat = FormatType.JSON;
            request.ContentType = FormatType.JSON;
            request.Method = MethodType.POST;
            request.Encoding = "UTF-8";

            // scenes: the moderation scenarios. You can specify one or more moderation scenarios. 
            // suggestion: the moderation result that you expect to return. A value of pass indicates that the moderated image is normal. A value of block indicates that the moderated image contains violations. 
            Dictionary<string, object> httpBody = new Dictionary<string, object>();
            httpBody.Add("scenes", new List<string> { "porn", "terrorism" });
            httpBody.Add("suggestion", "block");
            httpBody.Add("url", "URL of the moderated image");

            request.SetContent(System.Text.Encoding.Default.GetBytes(JsonConvert.SerializeObject(httpBody)), "utf-8", FormatType.JSON);
            try
            {
                ImageScanFeedbackResponse response = client.GetAcsResponse(request);


                if (response.HttpResponse.Status != 200)
                {
                    Console.WriteLine("the request failed. status:{0}", response.HttpResponse.Status);
                }
                Console.WriteLine(System.Text.Encoding.Default.GetString(response.HttpResponse.Content));
            }
            catch (Exception ex)
            {
                Console.WriteLine("Failed with error info: {0}", ex.Message);
            }
        }
    }
}