如何在C#中通过ID查找元素
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How to find an element by ID in C#
提问by Dah Problum
I want to do something like this in C#
我想在 C# 中做这样的事情
var id = "myID";
id.innerText = "Hello World";
I am a newbie and I'm sure this is pretty simple to do.
我是新手，我相信这很简单。
回答by Jonathan Wood
In ASP.NET, this is almost never necessary. For example, if you have a textbox called "txtMyTextBox", you can simply do txtMyTextBox.Text = "Hello World";. You can do this for any element that has the runat="server"attribute.
在 ASP.NET 中，这几乎从来没有必要。例如，如果您有一个名为“txtMyTextBox”的文本框，则只需执行txtMyTextBox.Text = "Hello World";. 您可以对任何具有该runat="server"属性的元素执行此操作。
If you need to find it from a string, you can use FindControl("txtMyTextBox"), but note that this does not search recursively. It will only find direct children of the control you call it on. (You can use a recursive algorithmto find controls recursively).
如果需要从字符串中查找，可以使用FindControl("txtMyTextBox")，但请注意，这不会递归搜索。它只会找到您调用它的控件的直接子级。（您可以使用递归算法以递归方式查找控件）。
Finally, if you want to specifically refer to an element by it's HTML ID, you cannot do this. C# runs on the server and does not have direct access to the page.
最后，如果您想通过其 HTML ID 专门引用一个元素，则不能这样做。C# 在服务器上运行，不能直接访问页面。
回答by Tony Hopkinson
There are loads of ways of doing that
有很多方法可以做到这一点
XmlDocument() doc = new XmlDocument();
doc.LoadXml(@"<SomeNodeName id = "myID">Hello World</SomeNodeName>";
Well you fooled me with the mention of innerText there.
好吧，你在那里提到了innerText 愚弄了我。
I personally wouldn't do this unless I really really had to.
我个人不会这样做，除非我真的不得不这样做。
int positionInArray = myGame.IndexOf("MyDiv" + id.ToString());
There are a shed load of assumptions in the above. Finding out what could go wrong with it would be a very good learning exercise.
上面有很多假设。找出它可能出什么问题将是一个非常好的学习练习。
The answer that mentioned dictionary, that got removed after someone downvoted it would be a better approach
提到字典的答案，在有人投反对票后被删除，这将是一个更好的方法
public class SomeObject
{
private Dictionary<int, String> myGames;
public SomeObject()
{
myGames = new Dictionary<int, string>();
}
public AddGame(int id, string desc)
{
myGames.Add(id,desc);
}
public string FindGameById(int id)
{
if(myGames.ContainsKey(id))
{
return myGames[id];
}
return null;
}
}
