Linq查询以检查列表和字符串之间的子字符串 [英] Linq query to check substring between a list and string

问题描述

我有一个字符串列表和一个字符串，我希望如果该字符串包含列表中存在的任何字符串，那么系统将返回false.我正在使用以下lambda表达式:

I have a list of strings and a string, and I want that if the string contains any of the string which is present in the list the system returns false. I am using following lambda expression:

 result = !(((string[])ro_operandVal).ToList<string>()).Any(x => x.ToString().ToUpper() == lo_operandVal.ToString().ToUpper());

以下是数据集:

lo_operandVal ="ABC DEF GHI邮政信箱" ro_operandVal是具有以下元素的字符串列表:

lo_operandVal = "ABC DEF GHI Post Office Box" ro_operandVal is the list of strings with following elements:

1. 邮政信箱
2. 邮政信箱BOX

当我评估该表达式时，它总是返回true.

when I evaluate this expression it always returns true.

推荐答案

您可以尝试以下linq- 如果在字符串中找到列表中的任何值，则它将返回false，如果找不到任何值，则它将返回true.

you can try the below linq - if any value in list found in string then it will return false, and if none of them found then it will return true.

var result = ro_operandVal.All(c=>lo_operandVal.IndexOf(c) < 0);

更新

都是对象类型，您知道它们的确切类型是List<string>和string，可以键入强制转换它们.

both are object type and you know their exact type that they are List<string> and string you can type cast them.

var result = ((List<string>)ro_operandVal).All(c=>lo_operandVal.ToString().IndexOf(c) < 0);

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