Direct Mail:An "Invalid URI: The Uri string is too long" error occurs when you use the C# SDK to send long content

Problematic scenario

When you use the C# software development kit (SDK) to send a large amount of content, an "Invalid URI: The Uri string is too long" error occurs.

Solutions

Enable Generate code in common mode and specify the parameters.

After you obtain the code, change the parameter passing method from URL to Body.

The following figure shows two key modifications:

Modified code:

using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Threading.Tasks;

using Tea;
using Tea.Utils;


namespace AlibabaCloud.SDK.Sample
{
    public class Sample
    {

        /**
         * Use an AccessKey pair to initialize the client.
         * @return Client
         * @throws Exception
         */
        public static AlibabaCloud.OpenApiClient.Client CreateClient()
        {
            // Leaking the code may expose your AccessKey pair and compromise the security of all your resources. The following sample code is for reference only.
            // Use the more secure Security Token Service (STS) method. For more information, see the related documents below.
            AlibabaCloud.OpenApiClient.Models.Config config = new AlibabaCloud.OpenApiClient.Models.Config
            {
                // Required. Make sure that the ALIBABA_CLOUD_ACCESS_KEY_ID environment variable is set.
                AccessKeyId = "xxxxxx",
                // Required. Make sure that the ALIBABA_CLOUD_ACCESS_KEY_SECRET environment variable is set.
                AccessKeySecret = "xxxxxx",
            };
            // For more information about endpoints, see the related documents.
            config.Endpoint = "dm.aliyuncs.com";
            return new AlibabaCloud.OpenApiClient.Client(config);
        }

        /**
         * API-related information
         * @param path params
         * @return OpenApi.Params
         */
        public static AlibabaCloud.OpenApiClient.Models.Params CreateApiInfo()
        {
            AlibabaCloud.OpenApiClient.Models.Params params_ = new AlibabaCloud.OpenApiClient.Models.Params
            {
                // The name of the API operation.
                Action = "SingleSendMail",
                // The version of the API operation.
                Version = "2015-11-23",
                // The protocol.
                Protocol = "HTTPS",
                // The HTTP method.
                Method = "POST",
                AuthType = "AK",
                Style = "RPC",
                // The path of the API operation.
                Pathname = "/",
                // The format of the request body.
                ReqBodyType = "formdata",
                // The format of the response body.
                BodyType = "json",
            };
            return params_;
        }

        public static void Main(string[] args)
        {
            AlibabaCloud.OpenApiClient.Client client = CreateClient();
            AlibabaCloud.OpenApiClient.Models.Params params_ = CreateApiInfo();
            // query params
            Dictionary<string, object> queries = new Dictionary<string, object>() { };
            queries["AccountName"] = "xxxxxx";
            queries["AddressType"] = 1;
            queries["ReplyToAddress"] = false;
            queries["ToAddress"] = "xxxxxx";
            queries["Subject"] = "test2";
            queries["HtmlBody"] = "test long content";
            // runtime options
            AlibabaCloud.TeaUtil.Models.RuntimeOptions runtime = new AlibabaCloud.TeaUtil.Models.RuntimeOptions();
            AlibabaCloud.OpenApiClient.Models.OpenApiRequest request = new AlibabaCloud.OpenApiClient.Models.OpenApiRequest
            {
                Body = queries,
            };
            // When you copy the code to run, print the return value of the API operation.
            // The return value is of the Map type. You can obtain three types of data from the Map: the response body, response headers, and the HTTP status code.
            client.CallApi(params_, request, runtime);
        }


    }
}

References:

Manage access credentials

Service endpoints