Question

我有一个if语句，如果两个或多个条件= true，我希望它是真的。我尝试使用＆amp;＆amp;运营商，但VS2012只是抱怨说，

错误运营商'＆amp;＆amp;'不能应用于'bool'和'Microsoft.Exchange.WebServices.Data.DelegateFolderPermissionLevel'

类型的操作数

我尝试了三种方法：

if (item.Permissions.CalendarFolderPermissionLevel != DelegateFolderPermissionLevel.Editor && item.Permissions.InboxFolderPermissionLevel != DelegateFolderPermissionLevel.Editor)
            {

                item.Permissions.CalendarFolderPermissionLevel = DelegateFolderPermissionLevel.Editor;

            }

和

     if (item.Permissions.CalendarFolderPermissionLevel && item.Permissions.InboxFolderPermissionLevel != DelegateFolderPermissionLevel.Editor)
            {
                item.Permissions.CalendarFolderPermissionLevel = DelegateFolderPermissionLevel.Editor;
            }

和

if ((item.Permissions.CalendarFolderPermissionLevel = DelegateFolderPermissionLevel.Editor) && (item.Permissions.InboxFolderPermissionLevel != DelegateFolderPermissionLevel.Editor))
            {
                item.Permissions.CalendarFolderPermissionLevel = DelegateFolderPermissionLevel.Editor;
            }

无法在网上找到任何有用的内容。我该怎么写这样的陈述？只有一个条件才能正常工作..

Answer 1

尝试在每个条件周围加上括号：

if ((item.Permissions.CalendarFolderPermissionLevel != DelegateFolderPermissionLevel.Editor) && 
    (item.Permissions.InboxFolderPermissionLevel != DelegateFolderPermissionLevel.Editor))
{
    item.Permissions.CalendarFolderPermissionLevel = DelegateFolderPermissionLevel.Editor;
}

Answer 2

Mr.p.s.w.g是对的，它可以解决您的问题，但我在这里告诉您代码中的问题是什么你的前两个试试

if (item.Permissions.CalendarFolderPermissionLevel != DelegateFolderPermissionLevel.Editor && item.Permissions.InboxFolderPermissionLevel != DelegateFolderPermissionLevel.Editor)

和

if (item.Permissions.CalendarFolderPermissionLevel && item.Permissions.InboxFolderPermissionLevel != DelegateFolderPermissionLevel.Editor)

因为您不了解运营商的优先顺序而失败使用此链接http://msdn.microsoft.com/en-us/library/2bxt6kc4.aspx

编译器将其解释为 TRUE＆amp;＆amp; item.Permissions.InboxFolderPermissionLevel

在第一种情况下，同样对另一种情况也是如此，这就是为什么它会给你错误

和你的第三次尝试

if ((item.Permissions.CalendarFolderPermissionLevel = DelegateFolderPermissionLevel.Editor) && (item.Permissions.InboxFolderPermissionLevel != DelegateFolderPermissionLevel.Editor))

第一个条件的运算符将是“==”而不是“=”:) “=”对于vb.net我猜。
我希望你现在清楚了你的答案将由p.s.w.g

给出
if ((item.Permissions.CalendarFolderPermissionLevel != DelegateFolderPermissionLevel.Editor) && (item.Permissions.InboxFolderPermissionLevel != DelegateFolderPermissionLevel.Editor)) { item.Permissions.CalendarFolderPermissionLevel = DelegateFolderPermissionLevel.Editor; }

运营商＆amp;＆amp;不能应用于'bool'类型的操作数

2 个答案: