写入XML节点 [英] writing to a XML node

问题描述

Hello,
I am trying to add a new node to a xml file. The code that I wrote works fine when there is a node exists but if not it throws an error of "object referance not set to an instance of an object." Basiccaly code copies a node and then writes data to the child nodes of the parent node. When I debug this code;

XmlNode credentialsnodedetails = xmlDocument.SelectNodes("/Credentials/Credential")[0];
            XmlNode newnode = credentialsnodedetails.CloneNode(true);

I see that "credentialsnodedetails" value is  NULL. I think because it is null I am having the problem. What should do programatically to avoid it?

推荐答案

您好，

您看过try {} catch {}吗?

Hello,

Have you look at try{} catch{}?

try{
   //your code here...
}
catch{
   //catch exception here... and do what ever you want with it.
}

网上有很多异常处理文章和示例.

There are plenty of exception handling articles and example on the web.

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