Question

为了显示集合中的项目，我会给asp-for标签标签助手的属性。下面的代码生成编译错误。

@foreach (var item in Model)
{
    <label asp-for="item.BookingCode"></label>
}

Answer 1

@foreach (var item in Model) { <label asp-for="@item.BookingCode"></label> }字符转义默认模型lambda代码。因此，您可以输入：

NSNotificationCenter *nc = [NSNotificationCenter defaultCenter];
[nc addObserver:self selector:@selector(managedObjectContextDidSave:) name:NSManagedObjectContextDidSaveNotification object:nil];


if (![[currentThread threadDictionary] objectForKey:@"managedObjectContext"]) {
        NSManagedObjectContext *managedObjectContext = [[NSManagedObjectContext alloc] init];

        // Configure Managed Object Context
        [managedObjectContext setPersistentStoreCoordinator:_mOCMainSetting.persistentStoreCoordinator];
        [[currentThread threadDictionary] setObject:managedObjectContext forKey:@"managedObjectContext"];

        if (!_contextArray) {
            _contextArray = [NSArray array];
        }
        NSMutableArray *mutableContextArray = [_contextArray mutableCopy];
        [mutableContextArray addObject:managedObjectContext];
        _contextArray = mutableContextArray;
    }

    NSManagedObjectContext *context = [[currentThread threadDictionary] objectForKey:@"managedObjectContext"];
    options = (Options*)[context objectWithID:_optionsID];

    return options;
}

   - (void)managedObjectContextDidSave:(NSNotification *)notification {
//    dispatch_async(dispatch_get_main_queue(), ^{
        for (NSManagedObjectContext *context in _contextArray) {
            [context mergeChangesFromContextDidSaveNotification:notification];
        }
//    });
}

Answer 2

我有一个简单的方法来做一个列表并显示它的属性。

List<string> razones = new List<string>();
foreach (var item in _context.Reason)
{
    razones.Add (item.Description);
}
System.Diagnostics.Debug.WriteLine(razones.Count);

MVC 6标签助手和foreach

2 个答案: