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POEntity FrameWork 4.1 Exception
 

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  1. POEntity FrameWork 4.1 Exception
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    <p>This is my code:</p> <pre><code> public void DeleteFolder(Entities.DocumentFolder folder) { DeleteFilesFromServer(folder.Id); _dbContext.Entry(folder).State = EntityState.Deleted; _dbContext.SaveChanges(); } public void DeleteFilesFromServer(int id) { var allDocuments = _dbContext.Document.Where(x =&gt; x.FolderId == id).ToList(); foreach (var filePath in allDocuments.Select(document =&gt; HttpContext.Current.Server.MapPath("~/Documents/") + document.DocumentFileName).Where(System.IO.File.Exists)) { System.IO.File.Delete(filePath); } } public class DocumentFolder { public DocumentFolder() { Documents=new List&lt;Document&gt;(); } public int Id { get; set; } public string FolderName { get; set; } public int ParentFolderId { get; set; } public List&lt;Document&gt; Documents { get; set; } } public class Document { public int Id { get; set; } public string DocumentName { get; set; } public string DocumentFileName { get; set; } public int FolderId { get; set; } public virtual DocumentFolder Folder { get; set; } } </code></pre> <p>By executing the delete operation I got the following exception:</p> <blockquote> <p>System.InvalidOperationException: The operation failed: The relationship could not be changed because one or more of the foreign-key properties is non-nullable. When a change is made to a relationship, the related foreign-key property is set to a null value. If the foreign-key does not support null values, a new relationship must be defined, the foreign-key property must be assigned another non-null value, or the unrelated object must be deleted.</p> </blockquote> <p>If I remove the <code>DeleteFilesFromServer(int id)</code> method the deletion working. Can someone help me?</p>
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