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    <p>If you have such specific requirement you should start by modifying your WCF service to not accept fields which user cannot modify. That leads to two simple DTOs:</p> <pre><code>public class MainTypeUpdateDto { public Guid ID { get; set; } public String Field1 { get; set; } public String Field2 { get; set; } public List&lt;DetailsTypeUpdateDto&gt; Details { get; set; } } public class DetailsTypeUpdateDto { public Guid MainTypeID { get; set; } public Guid SomeIdentityID { get; set; } public String Detail { get; set; } } </code></pre> <p>All other fields either cannot be updated or should be handled by your server side logic.</p> <p>Now when you receive dtos you can map them back to real entity objects. Based on user role you will know which fields and details you must set. You have two options to force EF to save only fields you want:</p> <ul> <li>First create object graph with <code>MainType</code> and related details. Set only Ids in these entities and attach <code>MainType</code> entity to context. After that set all updatable fields to current values. Do not change state of any entity.</li> <li>Create object graph with <code>MainType and all related details and set all Ids and all updatable fields. After that attach</code>MainType` entity to the context and <a href="https://stackoverflow.com/questions/5407885/modify-field-with-entity-framework-without-entityobject/5410375#5410375">manually set state</a> for each modified property (on each entity).</li> </ul> <p>You can need some additional logic if user can also remove or add details.</p>
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    1. USLadislav Mrnka
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    1. COThank you for your answer, but it's too late for now to change DTO. And one more thing is that nurse is not allowed to edit doctor's fields, but she still needs to see them on UI, so they should be present in DTO object but not mapped back.
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      1. USSerhiy Prysyazhnyy
    2. COYour solution with manually setting state of properties works perfect on Boolean and String properties and completely fixes my problem with partial update, however it won't work with foreign key properties. For example if I have some value in details that is actually FK value from some other table.
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      1. USSerhiy Prysyazhnyy
 

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