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POEF trying to insert nulls into database for some unknown reason
 

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  1. POEF trying to insert nulls into database for some unknown reason
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    <p>For some reason, this piece of code returns the following exception: </p> <pre><code>An error occurred while updating the entries. See the inner exception for details. Inner Exception: Cannot insert the value NULL into column 'Id', table 'aspnet-Webate.dbo.Tasks'; column does not allow nulls. INSERT fails.\r\n The statement has been terminated </code></pre> <p>the variable tasks is a string with this form: </p> <pre><code>(task1, task2, task3, task4) </code></pre> <p>The diagnostics are showing each of those 4 tasks with no problems in the console. none of the array indexes are null or blank</p> <pre><code> string[] taskArr = null; tasks = tasks.Substring(1, tasks.Length - 2); //remove the starting and ending parenthesis tasks = tasks.ToLower(); tasks = tasks.Replace(" ", ""); taskArr = tasks.Split(new char[] { ',' }); foreach (string t in taskArr) { System.Diagnostics.Debug.WriteLine("t="+t); if (t != null &amp;&amp; t != "") { Task task = db.Tasks.Find(t); if (task == null) { task = new Task { Id = t }; db.Tasks.Add(task); } } } try { db.SaveChanges(); //save task changes before trying to save role } catch (Exception e) { throw exception code } </code></pre> <p>Is there any other explanation for why EntityFramework may be trying to insert nulls into the database?</p> <p>Here is the task model:</p> <pre><code>using System; using System.Collections.Generic; public partial class Task { public Task() { this.Roles = new HashSet&lt;Role&gt;(); } public string Id { get; set; } public virtual ICollection&lt;Role&gt; Roles { get; set; } } </code></pre> <p>This class is generated by ADO.NET Entity Data Model functionality of Visual Studio 2012, and there are no other partial implementations of it</p>
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    1. USFuryvore
    1. USFuryvore
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    1. COIt throws an error because you have not given a value for the column `ID`. Is it a primary key? Did you define it as an Identity column?
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      1. USJohn Woo
    2. COthe answer is yes to both of your questions, as for not giving a value, look at the line: task = new Task{ Id = t };
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      1. USFuryvore
    3. COwhere did you set its configuration? via data annotation or fluentApi?
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      1. USJohn Woo
 

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