blocks|key|1330928|text|看看Activator.CreateInstance()。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1330929|myObject+=+(MyAbstractClass)Activator.CreateInstance("AssemblyName",+"TypeName");|code-block|syntax|javascript|1330930|或|1330931|var+type+=+Type.GetType("MyFullyQualifiedTypeName");
var+myObject+=+(MyAbstractClass)Activator.CreateInstance(type);|1330932|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Look at Activator.CreateInstance().

<pre><code>myObject = (MyAbstractClass)Activator.CreateInstance("AssemblyName", "TypeName");
</code></pre>

or

<pre><code>var type = Type.GetType("MyFullyQualifiedTypeName");
var myObject = (MyAbstractClass)Activator.CreateInstance(type);
</code></pre>

blocks|key|1115934|text|我相信这应该是可行的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1115935|myObject+=+(MyAbstractClass)Activator.CreateInstance(null,+childClassString);|code-block|syntax|javascript|1115936|第一个参数中的null默认为当前正在执行的程序集。有关更多参考，请访问：MSDN|offset|length|style|CODE|1115937|编辑:忘记强制转换为MyAbstractClass|1115938|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/d133hta4.aspx^0|0|0|7|4|10|4|0|0|A|F|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Y|8|@$I|Z|J|10|K|L]]|9|@$I|11|J|12|1|13]]|A|$]]|$1|M|3|N|5|6|7|14|8|@$I|15|J|16|K|L]]|9|@]|A|$]]|$1|O|3|-4|5|6|7|17|8|@]|9|@]|A|$]]]|P|$Q|$5|R|S|T|A|$U|V]]]]

I believe this should work:
<pre><code>myObject = (MyAbstractClass)Activator.CreateInstance(null, childClassString);
</code></pre>
The <code>null</code> in the first parameter defaults to the current executing assembly. For more reference: <a href="http://msdn.microsoft.com/en-us/library/d133hta4.aspx" rel="noreferrer">MSDN</a>
edit: forgot to cast to <code>MyAbstractClass</code>

blocks|key|1116003|text|我在实现这里的一些答案时遇到了一些困难，因为我试图实例化来自不同程序集的对象(但在相同的解决方案中)。所以我想我应该把我发现的东西发布出来。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1116004|首先，Activator.CreateInstance方法有几个重载。如果只调用Activator.CreateInstance(Type.GetType("MyObj"))，则假定对象是在当前程序集中定义的，并且它返回一个MyObj。|offset|length|style|CODE|1116005|如果您按照这里的答案中的建议调用它：Activator.CreateInstance(string+AssemblyName,+string+FullyQualifiedObjectName)，那么它将返回一个ObjectHandle，并且您需要对它调用Unwrap()来获取您的对象。当尝试调用在不同程序集中定义的方法时，此重载非常有用(顺便说一句，您可以在当前程序集中使用此重载，只需将AssemblyName参数保留为空)。|1116006|现在，我发现上面关于在AssemblyName中使用typeof(ParentNamespace.ChildNamespace.MyObject).AssemblyQualifiedName的建议实际上给了我错误，而且我不能让它工作。我会得到System.IO.FileLoadException+(无法加载文件或程序集...)。|1116007|我所做的工作如下：|1116008|var+container+=+Activator.CreateInstance(@"AssemblyName",@"ParentNamespace.ChildNamespace.MyObject");
MyObject+obj+=+(MyObject)container.Unwrap();
obj.DoStuff();|code-block|syntax|javascript|1116009|entityMap^0|0|3|O|14|1B|34|5|0|I|26|2X|C|3J|8|5F|C|0|B|C|Q|1X|3D|R|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@$D|W|E|X|F|G]|$D|Y|E|Z|F|G]|$D|10|E|11|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|12|8|@$D|13|E|14|F|G]|$D|15|E|16|F|G]|$D|17|E|18|F|G]|$D|19|E|1A|F|G]]|9|@]|A|$]]|$1|J|3|K|5|6|7|1B|8|@$D|1C|E|1D|F|G]|$D|1E|E|1F|F|G]|$D|1G|E|1H|F|G]]|9|@]|A|$]]|$1|L|3|M|5|6|7|1I|8|@]|9|@]|A|$]]|$1|N|3|O|5|P|7|1J|8|@]|9|@]|A|$Q|R]]|$1|S|3|-4|5|6|7|1K|8|@]|9|@]|A|$]]]|T|$]]

I had some difficulty implementing some of the answers here because I was trying to instantiate an object from a different assembly (but in the same solution). So I thought I'd post what I found to work.

First, the <code>Activator.CreateInstance</code> method has several overloads. If you just call <code>Activator.CreateInstance(Type.GetType("MyObj"))</code>, that assumes the object is defined in the current assembly, and it returns a <code>MyObj</code>.

If you call it as recommended in the answers here: <code>Activator.CreateInstance(string AssemblyName, string FullyQualifiedObjectName)</code>, then it instead returns an <code>ObjectHandle</code>, and you need to call <code>Unwrap()</code> on it to get your object. This overload is useful when trying to call a method defined in a different assembly (BTW, you can use this overload in the current assembly, just leave the <code>AssemblyName</code> parameter null).

Now, I found that the suggestion above to use <code>typeof(ParentNamespace.ChildNamespace.MyObject).AssemblyQualifiedName</code> for <code>AssemblyName</code> actually gave me errors, and I could not get that to work. I'd get <code>System.IO.FileLoadException</code> (could not load file or assembly...).

What I did get to work is as follows:

<pre><code>var container = Activator.CreateInstance(@"AssemblyName",@"ParentNamespace.ChildNamespace.MyObject");
MyObject obj = (MyObject)container.Unwrap();
obj.DoStuff();
</code></pre>

I have an abstract class and I want to initalize it to a class that extends it.

I have the child classes name as a string.

Besides this...

<pre><code>String childClassString;
MyAbstractClass myObject;

if (childClassString = "myExtenedObjectA")
 myObject = new ExtenedObjectA();
if (childClassString = "myExtenedObjectB")
 myObject = new ExtenedObjectB();
</code></pre>

How can I do this? Basically how do I get rid of the if statements here?

How do I instantiate a class given its string name?

我有一个抽象类，我想把它初始化为一个扩展它的类。我有一个字符串形式的子类名称。除此之外..。String childClassString;MyAbstractClass myObject;if (childClassString = "myExtenedObjectA")    myObject = new Exte...

问如何在给定字符串名称的情况下实例化一个类？
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问如何在给定字符串名称的情况下实例化一个类？
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