This topic describes how to install STS SDK for .NET and provides an example on how to use STS SDK for .NET.

Background information

  • To use STS SDK for .NET, you must install the core library of Alibaba Cloud SDK for .NET (aliyun-net-sdk-core) and the STS SDK (aliyun-net-sdk-sts).
  • Alibaba Cloud provides OpenAPI Explorer to simplify API usage. You can use OpenAPI Explorer to debug API operations and dynamically generate SDK sample code.
  • For more information about STS API operations, see What is STS?.
  • For more information about the endpoint of STS, see Endpoints.

Install the SDK for .NET

For more information about how to install the SDK for .NET, see Get started.

You can download the installation packages of the SDK for .NET from the following links:


The following code provides an example on how to call the AssumeRole API operation by using the SDK for .NET. You can visit OpenAPI Explorer to debug other API operations and obtain their sample code.

using System;
using System.Collections.Generic;
using Aliyun.Acs.Core;
using Aliyun.Acs.Core.Exceptions;
using Aliyun.Acs.Core.Profile;
using Aliyun.Acs.Sts.Model.V20150401;

namespace StsDemo
    class Program
        static void Main(string[] args)
            // Create an Alibaba Cloud client that is used to initiate requests.
            // When you create the client, specify your AccessKey ID and AccessKey secret.
            IClientProfile profile = DefaultProfile.GetProfile("cn-hangzhou", "<accessKeyId>", "<accessSecret>");
            DefaultAcsClient client = new DefaultAcsClient(profile);

            // Make a request and set the request parameters. For more information about the parameters, see API reference.
            var request = new AssumeRoleRequest();
            request.RoleArn = "<RoleArn>";
            request.RoleSessionName = "<RoleSessionName>";

            // Initiate the request and obtain a response.
            try {
                var response = client.GetAcsResponse(request);
            catch (ServerException e)
            catch (ClientException e)