How to Effectively Handle and Debug Entity Validation Errors in Entity Framework?

Detailed interpretation of entity verification errors

In the event of an error message, "One or more entities failed. View" Entity ValidationError "attributes to learn more details, you can access the verification error group.

Check the verification error

During the debugging process, you can access the verification error array through Visual Studio. However, manual access errors are also feasible:

<code class="language-csharp">try
{
    // 代码
    context.SaveChanges();
}
catch (DbEntityValidationException e)
{
    foreach (var eve in e.EntityValidationErrors)
    {
        Console.WriteLine("实体: \"{0}\", 状态: \"{1}\"", eve.Entry.Entity.GetType().Name, eve.Entry.State);
        foreach(var ve in eve.ValidationErrors)
        {
            Console.WriteLine("- 属性: \"{0}\", 错误: \"{1}\"", ve.PropertyName, ve.ErrorMessage);
        }
    }
    throw;
}</code>

EntityValidationErrs attribute contains the entity of verification failure, while ValidationError contains the error list of attribute level.

Advanced improvement

Show attribute value:

Use debug.write:

<code class="language-csharp">foreach(var ve in eve.ValidationErrors)
{
    Console.WriteLine("- 属性: \"{0}\", 值: \"{1}\", 错误: \"{2}\"", ve.PropertyName, eve.Entry.CurrentValues.GetValue<object>(ve.PropertyName), ve.ErrorMessage);
}</code>

Custom abnormalities containing detailed messages:

<code class="language-csharp">Debug.Write("- 属性: \"{0}\", 值: \"{1}\", 错误: \"{2}\"", ve.PropertyName, eve.Entry.CurrentValues.GetValue<object>(ve.PropertyName), ve.ErrorMessage);</code>

This exception is verified by formatting messages:

Rewilling SaveChanges:

<code class="language-csharp">public class FormattedDbEntityValidationException : Exception
{
    public override string Message => InnerException != null ? InnerException?.ToDetailedString() : "";
}</code>

This ensures that the verification details will be displayed in an error log (em, elmah).

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