如果元素不为null,我想读取xml元素 [英] I want to read xml elements if elements not null
本文介绍了如果元素不为null,我想读取xml元素的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
var q = 来自 b in okuyucu.Descendants( ARAC)
< span class =code-sdkkeyword>选择 new
{
userName =( string )b。元素( userName),
login = ( string )b。元素( login),
password =( string )b。元素( 密码)
}
我从两个不同的地方写一个xml文档窗户形式。我从另一个窗体中读取这个xml。
我的问题是
我的第一个表单不写登录。当我读取xml时,它会发生,因为没有任何名称为login的元素;
我想这样编写
如果登录存在则login =(字符串)b.Element(login)else login =
如何在select new {}
解决方案
<中执行此操作blockquote>使用 null-coalescing operator (? ?运营商):
var q = 来自 b okuyucu.Descendants( ARAC)
选择 new
{
userName =( string )b。元素( userName),
login =( strin g )b。元素( login)?? string .Empty,
password =( string )b。元素( 密码)
};
var q = from b in okuyucu.Descendants("ARAC")
select new
{
userName= (string)b.Element("userName"),
login= (string)b.Element("login"),
password= (string)b.Element("password")
}
I write a xml document from two different windows form. And I read this xml from another windows form.
My problem is that
My first form don't write "login". When I read xml it's occurs because there is'nt any element which is name "login";
I want to write like that
if login is exist then login= (string)b.Element("login") else login=""
How can I do it in "select new{}"
解决方案
Use null-coalescing operator (?? operator):
var q = from b in okuyucu.Descendants("ARAC") select new { userName = (string)b.Element("userName"), login = (string)b.Element("login") ?? string.Empty, password = (string)b.Element("password") };
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