小编Mar*_*rez的帖子

我在VS MacOS中创建了一个简单的C#.net核心控制台应用程序项目.但我得到错误MSB4057.stackoverflow上有类似的问题,但没有解释如何解决这种错误.

当我创建asp.net核心项目时,问题是一样的.

Build FAILED.

/Users/abhimanyuaryan/Unity3D/LearnCSharp/LearnCSharp/LearnCSharp.csproj : error MSB4057: The target "Build" does not exist in the project.
    0 Warning(s)
    1 Error(s)

Time Elapsed 00:00:00.02

---------------------- Done ----------------------

Build: 1 error, 0 warnings

我有这个UISwipeActionsConfiguration for iOS 11这个代码看起来像

public override UISwipeActionsConfiguration GetLeadingSwipeActionsConfiguration(UITableView tableView, NSIndexPath indexPath)
        {
            var definitionAction = ContextualDefinitionAction(indexPath.Row);
            var flagAction = ContextualFlagAction(indexPath.Row);
            var leadingSwipe = UISwipeActionsConfiguration.FromActions(new UIContextualAction[] { flagAction, definitionAction });

            leadingSwipe.PerformsFirstActionWithFullSwipe = false;
            return leadingSwipe;
        }


    public UIContextualAction ContextualDefinitionAction(int row)
    {
        string word = words[row];

        var action = UIContextualAction.FromContextualActionStyle(UIContextualActionStyle.Normal,
                                                            "Definition",
                                                            (ReadLaterAction, view, success) => {
                                                                var def = new UIReferenceLibraryViewController(word);

                                                                var alertController = UIAlertController.Create("No Dictionary Installed", "To install a Dictionary, Select Definition again, click `Manage` on the next screen and select …