如何按ToLower()分组? [英] How to group by ToLower()?

问题描述

在我的项目中，我读取了一个csv文件.在此csv文件中，有不同的功能及其持续时间.现在，我想按函数名称对结果进行分组，但是有时函数的名称是相同的，但有时字母是大写和小写，例如:examplevalue，EXampleValue.

In my project I read a csv file. In this csv file there are different functions and their duration. Now I want to group my result by the function name but sometimes the name of the function is the same but the letters are sometimes upper and lower case like: examplevalue, EXampleValue.

在此示例中，这将是2个不同的功能. 为了解决这个问题，我想将这些函数转换为小写.我尝试过这种方法，但是它不起作用:

In this example this would be 2 different functions. To solve this problem I want to convert these functions into lower case. I tried like this but it is not working:

var descItemsTemp = db.ChartDatas
                .GroupBy(x => new { x.Function.ToLower() });

推荐答案

您可以将比较器传递给GroupBy，在这种情况下，您可以使用现有的:

You can pass a comparer to GroupBy, in this case you can use an existing:

.GroupBy(x =>x.Function, StringComparer.OrdinalIgnoreCase);

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