LINQ lambda表达式替换字符串中的多个字符？ [英] LINQ lambda expression to replace multiple characters in a string?

问题描述

是否有可能写一个lambda表达式将通过对象数组遍历和替换X的所有出现，'Y'，''和'的属性之一Z'？

Is it possible to write a lambda expression that will iterate through array of objects and replace all occurences of 'X', 'Y', ' ' and 'Z' in one of the properties?

例如：

return query.Select(x => { x.SomePropertyName= x.SomePropertyName.Trim().Replace(' ', "_"); return x; }).ToList();

由于某些原因，查询上面并没有代替单个字符，当我需要更换多个字符。

For some reason, a query above doesn't replace a single character, when I need to replace multiple characters.

感谢您

推荐答案

当我要更换一次一些字符，与一个单一的其他角色，我经常使用string.Split和的string.join的组合：

When I want to replace one of a number of characters with one single other character, I often use a combination of string.Split and string.Join:

char[] unwanted = new[] {'X', 'Y', 'Z'};
query = query.Select(x =>
{
    x.SomePropertyName = string.Join("_", x.SomePropertyName.Split(unwanted));
    return x;
});

这将取代'X'，'Y'或'Z'与'_'。您可以与您所选择的循环结构结合这一点。

This will replace any occurrence of 'X', 'Y' or 'Z' with '_'. You can combine this with the looping construct of your choice.

由于在评论中讨论的那样，使用选择不果然在这种情况下，增加任何价值。一个正常的的foreach 循环会做的工作，甚至会产生更紧凑的代码：

As discussed in the comments, using Select does not really add any value in this case. A normal foreach loop would do the job, and would even produce more compact code:

char[] unwanted = new[] {'X', 'Y', 'Z'};
foreach(var x in query)
{
    x.SomePropertyName = string.Join("_", x.SomePropertyName.Split(unwanted));
};

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