使用实体框架将更改保存到SQL Server数据库时，一个或多个实体的验证失败

#1 楼

catch (DbEntityValidationException dbEx)
{
    foreach (var validationErrors in dbEx.EntityValidationErrors)
    {
        foreach (var validationError in validationErrors.ValidationErrors)
        {
            Trace.TraceInformation("Property: {0} Error: {1}", 
                                    validationError.PropertyName, 
                                    validationError.ErrorMessage);
        }
    }
}

#2 楼

 ((System.Data.Entity.Validation.DbEntityValidationException)ex).EntityValidationErrors
 

 ((System.Data.Entity.Validation.DbEntityValidationException)$exception).EntityValidationErrors
 

#3 楼

 catch (DbEntityValidationException dbEx)
 {
    foreach (var validationErrors in dbEx.EntityValidationErrors)
    {
       foreach (var validationError in validationErrors.ValidationErrors)
       {
          Trace.TraceInformation(
                "Class: {0}, Property: {1}, Error: {2}",
                validationErrors.Entry.Entity.GetType().FullName,
                validationError.PropertyName,
                validationError.ErrorMessage);
       }
    }
 }

#4 楼

public partial class MyDatabaseEntities : DbContext
{
    public override int SaveChanges()
    {
        try
        {
            return base.SaveChanges();
        }
        catch (DbEntityValidationException dbEx)
        {
            foreach (var validationErrors in dbEx.EntityValidationErrors)
            {
                foreach (var validationError in validationErrors.ValidationErrors)
                {
                    Trace.TraceInformation("Class: {0}, Property: {1}, Error: {2}",
                        validationErrors.Entry.Entity.GetType().FullName,
                        validationError.PropertyName,
                        validationError.ErrorMessage);
                }
            }

            throw;  // You can also choose to handle the exception here...
        }
    }
}

#5 楼

public class AppDbContext : DbContext
{
    public override int SaveChanges()
    {
        try
        {
            return base.SaveChanges();
        }
        catch (DbEntityValidationException dbEntityValidationException)
        {
            throw ExceptionHelper.CreateFromEntityValidation(dbEntityValidationException);
        }
        catch (DbUpdateException dbUpdateException)
        {
            throw ExceptionHelper.CreateFromDbUpdateException(dbUpdateException);
        }
    }   

    public override async Task<int> SaveChangesAsync(CancellationToken cancellationToken)
    {
        try
        {
            return await base.SaveChangesAsync(cancellationToken);
        }
        catch (DbEntityValidationException dbEntityValidationException)
        {
            throw ExceptionHelper.CreateFromEntityValidation(dbEntityValidationException);
        }
        catch (DbUpdateException dbUpdateException)
        {
            throw ExceptionHelper.CreateFromDbUpdateException(dbUpdateException);
        }
    }

public class ExceptionHelper
{
    public static Exception CreateFromEntityValidation(DbEntityValidationException ex)
    {
        return new Exception(GetDbEntityValidationMessage(ex), ex);
    }

    public static string GetDbEntityValidationMessage(DbEntityValidationException ex)
    {
        // Retrieve the error messages as a list of strings.
        var errorMessages = ex.EntityValidationErrors
            .SelectMany(x => x.ValidationErrors)
            .Select(x => x.ErrorMessage);

        // Join the list to a single string.
        var fullErrorMessage = string.Join("; ", errorMessages);

        // Combine the original exception message with the new one.
        var exceptionMessage = string.Concat(ex.Message, " The validation errors are: ", fullErrorMessage);
        return exceptionMessage;
    }

    public static IEnumerable<Exception> GetInners(Exception ex)
    {
        for (Exception e = ex; e != null; e = e.InnerException)
            yield return e;
    }

    public static Exception CreateFromDbUpdateException(DbUpdateException dbUpdateException)
    {
        var inner = GetInners(dbUpdateException).Last();
        string message = "";
        int i = 1;
        foreach (var entry in dbUpdateException.Entries)
        {
            var entry1 = entry;
            var obj = entry1.CurrentValues.ToObject();
            var type = obj.GetType();
            var propertyNames = entry1.CurrentValues.PropertyNames.Where(x => inner.Message.Contains(x)).ToList();
            // check MS SQL datetime2 error
            if (inner.Message.Contains("datetime2"))
            {
                var propertyNames2 = from x in type.GetProperties()
                                        where x.PropertyType == typeof(DateTime) ||
                                            x.PropertyType == typeof(DateTime?)
                                        select x.Name;
                propertyNames.AddRange(propertyNames2);
            }

            message += "Entry " + i++ + " " + type.Name + ": " + string.Join("; ", propertyNames.Select(x =>
                string.Format("'{0}' = '{1}'", x, entry1.CurrentValues[x])));
        }
        return new Exception(message, dbUpdateException);
    }
}

#6 楼

  try
{
         if (TryUpdateModel(theEvent))
         {
             storeDB.SaveChanges();
             return RedirectToAction("Index");
         }
}
catch (System.Data.Entity.Validation.DbEntityValidationException dbEx)
{
    Exception raise = dbEx;
    foreach (var validationErrors in dbEx.EntityValidationErrors)
    {
        foreach (var validationError in validationErrors.ValidationErrors)
        {
            string message = string.Format("{0}:{1}", 
                validationErrors.Entry.Entity.ToString(),
                validationError.ErrorMessage);
            // raise a new exception nesting
            // the current instance as InnerException
            raise = new InvalidOperationException(message, raise);
        }
    }
    throw raise;
}

#7 楼

#8 楼

public override int SaveChanges()
{
    try
    {
        return base.SaveChanges();
    }
    catch (DbEntityValidationException ex)
    {
        string errorMessages = string.Join("; ", ex.EntityValidationErrors.SelectMany(x => x.ValidationErrors).Select(x => x.ErrorMessage));
        throw new DbEntityValidationException(errorMessages);
    }
}

#9 楼

// Get the key field name & value.
// This assumes your DbContext object is "_context", and that it is a single part key.
var e = ((IObjectContextAdapter)_context).ObjectContext.ObjectStateManager.GetObjectStateEntry(validationErrors.Entry.Entity);
string key = e.EntityKey.EntityKeyValues[0].Key;
string val = e.EntityKey.EntityKeyValues[0].Value;

#10 楼

var validationErrors = model.GetValidationErrors();

var h = validationErrors.SelectMany(x => x.ValidationErrors
                                          .Select(f => "Entity: " 
                                                      +(x.Entry.Entity) 
                                                      + " : " + f.PropertyName 
                                                      + "->" + f.ErrorMessage));

#11 楼

#12 楼

#13 楼

Try
   Return MyBase.SaveChanges()
Catch dbEx As Validation.DbEntityValidationException
   For Each [error] In From validationErrors In dbEx.EntityValidationErrors
                       From validationError In validationErrors.ValidationErrors
                       Select New With { .PropertyName = validationError.PropertyName,
                                         .ErrorMessage = validationError.ErrorMessage,
                                         .ClassFullName = validationErrors.Entry.Entity
                                                                    .GetType().FullName}

        Diagnostics.Trace.TraceInformation("Class: {0}, Property: {1}, Error: {2}",
                                           [error].ClassFullName,
                                           [error].PropertyName,
                                           [error].ErrorMessage)
   Next
   Throw
End Try

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#17 楼