问题描述

我可能遗漏了一些非常明显的东西，但现在我看不到了.我有对 System.Windows.Forms 的引用，并且我有下一个 using 类:

It is possible that I'm missing something very obvious but now I can not see now. I have the reference to System.Windows.Forms and I have the next using classes:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.IO;

using System.Windows.Forms;
using System.Windows.Forms.FolderBrowserDialog;

但是编译器总是给我下一个错误:

But the compiler always give to me the next error:

错误 CS0138:使用命名空间指令只能应用于命名空间；'System.Windows.Forms.FolderBrowserDialog' 是一种类型而不是命名空间

error CS0138: A using namespace directive can only be applied to namespaces; 'System.Windows.Forms.FolderBrowserDialog' is a type not a namespace

推荐答案

你做不到

using System.Windows.Forms.FolderBrowserDialog;

因为它是一个类型而不是一个命名空间.它所属的命名空间是System.Windows.Forms.删除这一行，如果你想实例化一个 FolderBrowserDialog 并确保你有这一行

as it is a type and not a namespace. The namespace it belongs to is System.Windows.Forms. Remove this line and if you want to instantiate a FolderBrowserDialog and just make sure you have the line

using System.Windows.Forms;

并像这样制作一个 FolderBrowserDialog:

var fbd = new FolderBrowserDialog();

<小时>

所有这一切都与 Java 形成对比，在 Java 中您导入类型而不是使用命名空间，这可能是您出错的地方 - 在 Java 中您会执行以下操作:

All this is in contrast to Java, where you import types not use namespaces, which is where you may be going wrong - in Java you would do something like:

import System.Windows.Forms.FolderBrowserDialog;

然后就可以使用了.

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