An exception of type
‘System.Data.Entity.Validation.DbEntityValidationException’ occurred
in EntityFramework.dll but was not handled in user code

Additional information: Validation Failed for one or more entities.
See ‘EntityValidationErrors’ property for more details.

尝试注册新用户时收到此错误. ‘db.SaveChanges()’发生错误

这是代码：

public ActionResult Registration(x.Models.User user)
        {
            if(ModelState.IsValid)
            {
                using(var db = new xDBEntities1())
                {
                    var crypto = new SimpleCrypto.PBKDF2();
                    var encrpPass = crypto.Compute(user.password);
                    var sysUser = db.users.Create();

                    sysUser.email = user.email;
                    sysUser.username = user.username;
                    sysUser.password = encrpPass;
                    sysUser.premium_credits = 0;
                    sysUser.login_times = 0;
                    sysUser.last_ip = Request.ServerVariables["REMOTE_ADDR"];
                    sysUser.creation_ip = Request.ServerVariables["REMOTE_ADDR"];
                    sysUser.banned = 0;
                    sysUser.creation_date = DateTime.Now;
                    sysUser.creation_time = DateTime.Now.TimeOfDay;

                    db.users.Add(sysUser);
                    db.SaveChanges();
                }
            }
            return RedirectToAction("Index","Home");
        }

编辑：
用户模型类

public class User
    {
        [required]
        [StringLength(50)]
        [display(Name="Username: ")]
        public String username { get; set; }
        [required]
        [DataType(DataType.Password)]
        [StringLength(50,MinimumLength=6)]
        [display(Name="Password: ")]
        public string password { get; set; }
        [required]
        [EmailAddress]
        [StringLength(50)]
        public string email { get; set; }
        public int phonenumber { get; set; }
        public int mobilephonenumber { get; set; }

    }
}

我该怎么处理？

该解决方案已在本页面上说明：

Validation failed for one or more entities. See ‘EntityValidationErrors’ property for more details

作为您使用.net mvc的额外注意事项,您应该使用System.Diagnostics.Debug.WriteLine()而不是Console.Writeline(),并且在调试时将写入调试输出窗口.由于在运行mvc项目时无法写入控制台.

/**
* @param in the input stream to read from
* @exception IOException error during read
* @exception ClassNotFoundException when class not found
*/
private void readobject(java.io.ObjectInputStream in)
throws java.io.IOException,java.lang.classNotFoundException {
    in.defaultReadobject();

    in.registerValidation(
        new ObjectInputValidation() {
            public void validateObject() {
                if (attr.getClass() == DefaultAttributes.class) {
                    Impl impl = new Impl(LocalFileSystem.this);
                    attr = new InnerAttrs(LocalFileSystem.this,impl,impl);
                }
            }
        },0
    );
}

@SuppressWarnings("unchecked")
public T pasteObject() {

    try {
        ByteArrayInputStream bai = new ByteArrayInputStream(objectHolder);
        ObjectInputStream oi = new ObjectInputStream(bai);
        T resourceList = (T) oi.readobject();
        if (resourceList instanceof ObjectInputValidation) {
            ((ObjectInputValidation) resourceList).validateObject();
        }

        return resourceList;
    } catch (Exception e) {
        throw new RuntimeException("Failed To Paste Object",e); //$NON-NLS-1$
    }
}

/**
 * Overridden to properly register component documents with the creole
 * register when this compound is deserialized.
 */
private void readobject(ObjectInputStream stream) throws IOException,ClassNotFoundException {
  stream.defaultReadobject();
  // register a validation callback to add our child documents
  // to the creole register and fire the relevant events. This
  // is what the Factory would do if the children were loaded in
  // the normal way.
  stream.registerValidation(new ObjectInputValidation() {
    public void validateObject() {
      for(Document d : documents.values()) {
        Gate.getCreoleRegister().get(d.getClass().getName())
            .addInstantiation(d);
        Gate.getCreoleRegister().resourceLoaded(
            new CreoleEvent(d,CreoleEvent.RESOURCE_LOADED));
      }
    }
  },0);
}

private void readobject (ObjectInputStream ois) throws ClassNotFoundException,IOException {
    ois.defaultReadobject ();
    ois.registerValidation(new ObjectInputValidation() {
        public void validateObject() throws InvalidobjectException {
            warnedFiles.add(getFileImpl());
        }
    },0);
}

/**
 * Creates an ObjectInputStream that deserializes a stream of objects from a reader using XStream. <h3>Example</h3>
 * 
 * <pre>
 * ObjectInputStream in = xstream.createObjectOutputStream(aReader);
 * int a = out.readInt();
 * Object b = out.readobject();
 * Object c = out.readobject();
 * </pre>
 * 
 * @see #createObjectOutputStream(com.thoughtworks.xstream.io.HierarchicalStreamWriter,String)
 * @since 1.0.3
 */
public ObjectInputStream createObjectInputStream(final HierarchicalStreamReader reader) throws IOException {
    return new CustomObjectInputStream(new CustomObjectInputStream.StreamCallback() {
        @Override
        public Object readFromStream() throws EOFException {
            if (!reader.hasMoreChildren()) {
                throw new EOFException();
            }
            reader.moveDown();
            final Object result = unmarshal(reader);
            reader.moveUp();
            return result;
        }

        @Override
        public Map<String,Object> readFieldsFromStream() throws IOException {
            throw new NotActiveException("not in call to readobject");
        }

        @Override
        public void defaultReadobject() throws NotActiveException {
            throw new NotActiveException("not in call to readobject");
        }

        @Override
        public void registerValidation(final ObjectInputValidation validation,final int priority)
                throws NotActiveException {
            throw new NotActiveException("stream inactive");
        }

        @Override
        public void close() {
            reader.close();
        }
    },classLoaderReference);
}

/**
 * Creates an ObjectInputStream that deserializes a stream of objects from a reader using XStream.
 *
 * @see #createObjectOutputStream(com.thoughtworks.xstream.io.HierarchicalStreamWriter,String)
 * @see #createObjectInputStream(com.thoughtworks.xstream.io.HierarchicalStreamReader)
 * @since 1.4.10
 */
public ObjectInputStream createObjectInputStream(final HierarchicalStreamReader reader,final DataHolder dataHolder)
        throws IOException {
    return new CustomObjectInputStream(new CustomObjectInputStream.StreamCallback() {
        @Override
        public Object readFromStream() throws EOFException {
            if (!reader.hasMoreChildren()) {
                throw new EOFException();
            }
            reader.moveDown();
            final Object result = unmarshal(reader,dataHolder);
            reader.moveUp();
            return result;
        }

        @Override
        public Map<String,classLoaderReference);
}

private void readobject(ObjectInputStream s) throws IOException {

            final int LOW_PRIORITY = -5;
            final int MEDIUM_PRIORITY = 0;
            final int HIGH_PRIORITY = 5;

            s.registerValidation(new ObjectInputValidation() {
                public void validateObject() {
                    log.actual("validateObject() medium priority 1");
                }
            },MEDIUM_PRIORITY);

            s.registerValidation(new ObjectInputValidation() {
                public void validateObject() {
                    log.actual("validateObject() high priority");
                }
            },HIGH_PRIORITY);

            s.registerValidation(new ObjectInputValidation() {
                public void validateObject() {
                    log.actual("validateObject() low priority");
                }
            },LOW_PRIORITY);

            s.registerValidation(new ObjectInputValidation() {
                public void validateObject() {
                    log.actual("validateObject() medium priority 2");
                }
            },MEDIUM_PRIORITY);
        }

public ObjectInputStream createObjectInputStream(final HierarchicalStreamReader paramHierarchicalStreamReader)
{
  return new CustomObjectInputStream(new CustomObjectInputStream.StreamCallback()
  {
    public void close()
    {
      paramHierarchicalStreamReader.close();
    }

    public void defaultReadobject()
    {
      throw new NotActiveException("not in call to readobject");
    }

    public Map readFieldsFromStream()
    {
      throw new NotActiveException("not in call to readobject");
    }

    public Object readFromStream()
    {
      if (!paramHierarchicalStreamReader.hasMoreChildren())
        throw new EOFException();
      paramHierarchicalStreamReader.moveDown();
      Object localObject = XStream.this.unmarshal(paramHierarchicalStreamReader);
      paramHierarchicalStreamReader.moveUp();
      return localObject;
    }

    public void registerValidation(ObjectInputValidation paramAnonymousObjectInputValidation,int paramAnonymousInt)
    {
      throw new NotActiveException("stream inactive");
    }
  },this.classLoaderReference);
}

/**
    * Creates an ObjectInputStream that deserializes a stream of objects from a reader using XStream.
    *
    * <h3>Example</h3>
    * <pre>ObjectInputStream in = xstream.createObjectOutputStream(aReader);
    * int a = out.readInt();
    * Object b = out.readobject();
    * Object c = out.readobject();</pre>
    *
    * @see #createObjectOutputStream(com.thoughtworks.xstream.io.HierarchicalStreamWriter,String)
    * @since 1.0.3
    */
public ObjectInputStream createObjectInputStream(
        final HierarchicalStreamReader reader) throws IOException {
    return new CustomObjectInputStream(
            new CustomObjectInputStream.StreamCallback() {
                public Object readFromStream() throws EOFException {
                    if (!reader.hasMoreChildren()) {
                        throw new EOFException();
                    }
                    reader.moveDown();
                    Object result = unmarshal(reader);
                    reader.moveUp();
                    return result;
                }

                public Map readFieldsFromStream() throws IOException {
                    throw new NotActiveException(
                            "not in call to readobject");
                }

                public void defaultReadobject() throws NotActiveException {
                    throw new NotActiveException(
                            "not in call to readobject");
                }

                public void registerValidation(
                        ObjectInputValidation validation,int priority)
                        throws NotActiveException {
                    throw new NotActiveException("stream inactive");
                }

                public void close() {
                    reader.close();
                }
            });
}

void registerValidation(ObjectInputValidation validation,int priority)
throws NotActiveException,InvalidobjectException;

@Override
public void registerValidation(final ObjectInputValidation validation,final int priority)
        throws NotActiveException,InvalidobjectException {
    peekCallback().registerValidation(validation,priority);
}

public final synchronized void registerValidation(ObjectInputValidation obj,int prio)
    throws NotActiveException,InvalidobjectException{
    // XXX I18N,logging needed.
    throw new Error("Method registerValidation not supported");
}

public final synchronized void registerValidation(ObjectInputValidation obj,logging needed.
    throw new Error("Method registerValidation not supported");
}

public final synchronized void registerValidation(ObjectInputValidation obj,logging needed.
    throw new Error("Method registerValidation not supported");
}

public final synchronized void registerValidation(ObjectInputValidation obj,logging needed.
    throw new Error("Method registerValidation not supported");
}

public final synchronized void registerValidation(ObjectInputValidation obj,logging needed.
    throw new Error("Method registerValidation not supported");
}

void registerValidation(ObjectInputValidation validation,InvalidobjectException;

@Override
public void registerValidation(final ObjectInputValidation validation,priority);
}

/** {@inheritDoc} */
@Override public void registerValidation(ObjectInputValidation obj,int pri) {
    // No-op.
}

public final synchronized void registerValidation(ObjectInputValidation obj,logging needed.
    throw new Error("Method registerValidation not supported");
}

public void registerValidation(ObjectInputValidation paramObjectInputValidation,int paramInt)
{
  peekCallback().registerValidation(paramObjectInputValidation,paramInt);
}

public final synchronized void registerValidation(ObjectInputValidation obj,logging needed.
    throw new Error("Method registerValidation not supported");
}

public final synchronized void registerValidation(ObjectInputValidation obj,logging needed.
    throw new Error("Method registerValidation not supported");
}

public final synchronized void registerValidation(ObjectInputValidation obj,logging needed.
    throw new Error("Method registerValidation not supported");
}

public final synchronized void registerValidation(ObjectInputValidation obj,logging needed.
    throw new Error("Method registerValidation not supported");
}

public abstract void registerValidation(ObjectInputValidation paramObjectInputValidation,int paramInt);