使用 Linq 搜索不区分大小写的 IList 对象

Question

专家。我想在我的 IList 中搜索“名称”字段...但它始终区分大小写。如何在不区分大小写的情况下进行搜索？以下是我的代码：

型号：

public IList<Student> Search(IList<Student> list, string keyword)
{
    return list.Where(e => e.Name.Contains(keyword)).ToList();
}

类：

public class Student
{
    public string Name {get;set;}
    public string MatricNo {get;set;}
    public string Gender {get;set;}
}

控制器：

IList<Student> list = new List<Student>();

Student students1 = new Student();
students1.Name = "Mike";
students1.MatricNo = "12345";
students1.Gender = "Male";
list.Add(students1);

Student students2 = new Student();
students2.Name = "Steve";
students2.MatricNo = "12345";
students2.Gender = "Male";
list.Add(students2);

Student students3 = new Student();
students3.Name = "Jane";
students3.MatricNo = "12345";
students3.Gender = "Male";
list.Add(students3);

string keyword = "mik"; //Example of search keyword
list = _searchModel.Search(list, keyword);

我想要返回名为 Mike 的学生的列表，但它没有返回。相反，它只会在关键字 = "Mik" 时返回。当关键字=“mik”时如何进行不区分大小写的搜索？请注意，关键字可以是学生“姓名”的子字符串。

Answer 1

我使用 .ToLower() 复制并粘贴了您的示例，它在 LinqPad 中对我来说效果很好。我更改了搜索关键字以使用更多变体，只是为了更清楚地显示结果。

我的代码完全正确：

void Main()
{
    IList<Student> list = new List<Student>();

    Student students1 = new Student();
    students1.Name = "Mike";
    students1.MatricNo = "12345";
    students1.Gender = "Male";
    list.Add(students1);

    Student students2 = new Student();
    students2.Name = "Steve";
    students2.MatricNo = "12345";
    students2.Gender = "Male";
    list.Add(students2);

    Student students3 = new Student();
    students3.Name = "Jane";
    students3.MatricNo = "12345";
    students3.Gender = "Male";
    list.Add(students3);

    var test1 = Search(list, "mik"); //returns Mike
    var test2 = Search(list, "MIK"); //returns Mike
    var test3 = Search(list, "iKe"); //returns Mike
    //all three are the same
}

public IList<Student> Search(IList<Student> list, string keyword)
{
    return list.Where(e => e.Name.ToLower().Contains(keyword.ToLower())).ToList();
}

public class Student
{
    public string Name {get;set;}
    public string MatricNo {get;set;}
    public string Gender {get;set;}
}