Amazon Cognito and ASP.NET C# Integration

James James

5y3.1k.NET

Hello, I am trying to implement cognito user pool into my login, register and logout and I have tried this code for Signup

protected void Button1_Click(object sender, EventArgs e)
{
AddCognitoUser();
}
static async Task AddCognitoUser()
{
string username = "Name";
string password = "Password";
string phonenumber = "+678172932";
string email = "[email protected]";
AmazonCognitoIdentityProviderClient provider =
new AmazonCognitoIdentityProviderClient(new Amazon.Runtime.AnonymousAWSCredentials());
SignUpRequest signUpRequest = new SignUpRequest();
signUpRequest.ClientId = "clientid";
signUpRequest.Username = username;
signUpRequest.Password = password;
AttributeType attributeType = new AttributeType();
attributeType.Name = "phone_number";
attributeType.Value = phonenumber;
signUpRequest.UserAttributes.Add(attributeType);
AttributeType attributeType1 = new AttributeType();
attributeType1.Name = "email";
attributeType1.Value = email;
signUpRequest.UserAttributes.Add(attributeType1);
try
{
SignUpResponse result = await provider.SignUpAsync(signUpRequest);
}
catch (Exception e)
{
System.Diagnostics.Debug.WriteLine(e);
}
}

When i run these codes, there is an error saying "An unhandled exception of type 'System.NullReferenceException' occurred in mscorlib.dll" and i tried to find but there is nothing null in the codes. Is there anything that i do wrong?

Or is there any other better tutorial that help to integrate cognito with asp.net c#?

Any help will be really helpful.

Thank You.

2 Replies

Know the answer? Post it — somebody with the same question will find it here.

Sachin Singh5y ago
Accepted answer
follow below steps for signup
step 1.Store info in appSettings (web.config)
    . . .

    "AWSRegion" value="eu-west-1" />
    "CLIENT_ID" value="XXXXXXXXXXXXXXXXXXXXXXXXXX" />
    "USERPOOL_ID" value="REGION_XXXXXXXXX" />
    "IDENITYPOOL_ID" value="REGION:XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXX" />
    "IDENITY_PROVIDER" value="cognito-idp.REGION.amazonaws.com/" />

step 2.Create a Class
public class CognitoUser : IdentityUser
    {
        public string Password { get; set; }
        public UserStatusType Status { get; set; }
    }
Step 3.Create a SignUp class like below
using Amazon.CognitoIdentityProvider;
using Amazon.CognitoIdentityProvider.Model;

    public class CognitoUserStore : IUserStore,
                                    IUserLockoutStore,
                                    IUserTwoFactorStore
    {
         private readonly AmazonCognitoIdentityProviderClient _client =
            new AmazonCognitoIdentityProviderClient();
        private readonly string _clientId = ConfigurationManager.AppSettings["CLIENT_ID"];
        private readonly string _poolId = ConfigurationManager.AppSettings["USERPOOL_ID"];

        public Task CreateAsync(CognitoUser user)
        {
            // Register the user using Cognito
            var signUpRequest = new SignUpRequest
            {
                ClientId = ConfigurationManager.AppSettings["CLIENT_ID"],
                Password = user.Password,
                Username = user.Email,

            };

            var emailAttribute = new AttributeType
            {
                Name = "email",
                Value = user.Email
            };
            signUpRequest.UserAttributes.Add(emailAttribute);

            return _client.SignUpAsync(signUpRequest);
        }
    }
Sachin Singh5y ago
install
Install-Package Microsoft.AspNet.Identity.EntityFramework