C# 检查xml节点是否存在？
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Check xml node is exist or not?
提问by Shree
I want to check given node is exist or not in *.xmlfile.
I try:
我想检查给定的节点是否存在于*.xml文件中。我尝试：
string language = node.SelectSingleNode("language") != null ? (node.SelectSingleNode("language").Value == "en" ? "en-US" : "en-US") : "en-US";
But I think its check only for node value.In some xmlfile I haven't node called languageSo its gives a Null Reference Ex...
How to check Given node is exist or not in *.xmlfile? Thanks.
但我认为它只检查节点值。在一些xml文件中我没有节点调用language所以它给出了一个 Null Reference Ex... 如何检查给定节点是否存在于*.xml文件中？谢谢。
采纳答案by weston
Something is null. You are checking the selected "language" node for null, so is nodeitself null?
东西是null。您正在检查所选的“语言”节点null，它node本身也是null？
Spread the code out over more lines, nested ?:code is not easy to follow and you have had to repeat default values and function calls.
将代码分散到更多行中，嵌套?:代码不容易遵循，您不得不重复默认值和函数调用。
Use variables, such as one for node.SelectSingleNode("language")so you don't do that twice. And this will help you find the bug.
使用变量，例如一个 fornode.SelectSingleNode("language")这样你就不会这样做两次。这将帮助您找到错误。
string language = "en-US"; //default
if(node!=null)
{
var langNode = node.SelectSingleNode("language");
if(langNode!=null)
{
//now look at langNode.Value, and overwrite language variable, maybe you wanted:
if(langNode.Value != "en")
{
language = langNode.Value;
}
}
}
