C# · 12月 31, 2021

c# – 如何将var转换为string []

我在C#中写了一个LINQ string etXML = File.ReadAllText(“ET_Volume.xml”);string[] allLinesInAFile = etXML.Split(‘\n’);var possibleElements = from line in allLinesInAFile where !this.IsNode(line) select new { Node = line.Trim() }; string[] xmlLines = possibleElements.ToArray<string>();

问题出现在最后一行,出现以下错误:

System.Collections.Generic.IEnumerable<AnonymousType#1> does
not contain a deFinition for ToArray and the best extension method
overload
System.Linq.Enumerable.ToArray<TSource>(System.Collections.Generic.IEnumerable<TSource>)
has some invalid arguments

Instance argument: cannot convert
from System.Collections.Generic.IEnumerable<AnonymousType#1> to
System.Collections.Generic.IEnumerable<string>

有什么问题以及将我的var转换为字符串[]的方法是什么?

解决方法 您在此处创建匿名类型: new { Node = line.Trim() }

这不是必要的,只需返回

line.Trim()

你有一个IEnumerable字符串.然后你的ToArray将工作:

var possibleElements = from line in allLinesInAFile where !this.IsNode(line) select line.Trim(); string[] xmlLines = possibleElements.ToArray();

另一种选择是:

possibleElements.Select(x => x.Node).ToArray();