This operation is only valid on generic types.

[dradoaica]

Exception:

This operation is only valid on generic types.
at System.RuntimeType.GetGenericTypeDefinition()
at DapperExtensions.DapperImplementor.AddParameter[T](T entity, DynamicParameters parameters, IMemberMap prop, Boolean useColumnAlias)
at DapperExtensions.DapperImplementor.GetDynamicParameters[T](T entity, IClassMapper classMap, IList1 sequenceColumn, IList1 foreignKeys, IList1 ignoredColumns, Boolean useColumnAlias) at DapperExtensions.DapperImplementor.GetDynamicParameters[T](IClassMapper classMap, T entity, Boolean useColumnAlias) at DapperExtensions.DapperImplementor.InternalInsert[T](IDbConnection connection, T entity, IDbTransaction transaction, Nullable1 commandTimeout, IClassMapper classMap, IList1 nonIdentityKeyProperties, IMemberMap identityColumn, IMemberMap triggerIdentityColumn, IList1 sequenceIdentityColumn)
at DapperExtensions.DapperAsyncImplementor.InternalInsertAsync[T](IDbConnection connection, T entity, IDbTransaction transaction, Nullable1 commandTimeout, IClassMapper classMap, IList1 nonIdentityKeyProperties, IMemberMap identityColumn, IMemberMap triggerIdentityColumn, IList1 sequenceIdentityColumn) at DapperExtensions.DapperAsyncImplementor.InsertAsync[T](IDbConnection connection, T entity, IDbTransaction transaction, Nullable1 commandTimeout)

In DapperImplementor:

if (prop.MemberInfo.DeclaringType == typeof(bool) || (prop.MemberInfo.DeclaringType.IsGenericType && prop.MemberType.GetGenericTypeDefinition() == typeof(Nullable<>) && prop.MemberInfo.DeclaringType.GetGenericArguments()[0] == typeof(bool)))
{
...
}

There should be a check prop.MemberType.IsGenericType before prop.MemberType.GetGenericTypeDefinition()

[valfrid-ly]

Could you please provide more information to help replicating it?

[dradoaica]

List<AlertExecution> ae = new List<AlertExecution>();
...
using (Microsoft.Data.SqlClient.SqlConnection connection = ...)
{
await connection.InsertAsync(ae.AsEnumerable());
}

where AlertExecution : FullAuditedEntity<Guid> and has a member of generic type

[nroda1976]

Using Dapper 2.0.123 and DapperExtensions 1.7
A generic error with be raise in DapperImplementor in the lines reported.
The code below work fine in version 1.6.3 but raise the reported issue in 1.7
How to Reproduce example:

public class RepositoryBase<TEntity> where TEntity : class
{
	public DateTime CreationDate { get; set; }
        public string CreationUser { get; set; }
}

public class UserLogin : RepositoryBase<UserLogin>
{
	[Key]
	public long UserID { get; set; }
	public long EntityID { get; set; }
	
	public static UserLogin Login()
	{
		using (SqlConnection cn = new SqlConnection(XXXXX))
		{
			cn.Update(userLogin);
		}
		return userLogin;
	}
}