title: SqlGeometry in Entity Framework Core
body: <p>I'm trying to work with Entity Framework Core against a SQL Server database.</p>
  
  <p>I've got a test class (based on Microsoft's demo 'blog/post' sample code) which I migrate to a SQL Server database. </p>
  
  <p>I want to add a member to my test class which will save as a <code>SqlGeometry</code> column and allow me to read/write that data. </p>
  
  <p>It doesn't seem that there is an appropriate geometry type in Entity Framework/ .NET Core - so how should I approach the problem?</p>