关于ComboBox关联的问题

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1.想实现选择班级的时候，下面的只显示这个班级的学生
2.想从下面这个控件中取出所有字段的值，即StudentName Gender ClassCode

KevinChen · KevinChen

您好，问题已收到，预计明天可以给您答复，谢谢~

Richard.Ma · Richard.Ma

我看你代码也没有写完，我给你修改好了，你的另一个帖子，也是这样的思路就行，将这个编辑器作为flexgrid 的列编辑器即可

public partial class Form1 : Form
{
List<Student> Students = new List<Student>();
public Form1()
{
InitializeComponent();
List<Class> Classes = new List<Class>();
Classes.Add(new Class { ClassCode = "101", ClassName = "一(1)班" });
Classes.Add(new Class { ClassCode = "102", ClassName = "一(2)班" });
Students.Add(new Student { StudentName = "赵一", Gender = "男", ClassCode = "101" });
Students.Add(new Student { StudentName = "钱二", Gender = "女", ClassCode = "101" });
Students.Add(new Student { StudentName = "孙三", Gender = "男", ClassCode = "102" });
Students.Add(new Student { StudentName = "李四", Gender = "女", ClassCode = "102" });
cmbClass.ItemsDataSource = Classes;
cmbClass.ItemsDisplayMember = "ClassName";
cmbClass.ItemsValueMember = "ClassCode";
cmbStudents.ItemsDataSource = Students;
cmbStudents.ItemsDisplayMember = "StudentName";
cmbStudents.ItemsValueMember = "StudentName";
cmbStudents.BeforeDropDownOpen += CmbStudents_BeforeDropDownOpen;
//1.想实现选择班级的时候，下面的只显示这个班级的学生
//2.想从下面这个控件中取出所有字段的值，即StudentName Gender ClassCode
}
private void CmbStudents_BeforeDropDownOpen(object sender, CancelEventArgs e)
{
cmbStudents.ItemsDataSource = Students.Where(t => t.ClassCode ==cmbClass.Value.ToString());
}
}

复制代码

hiliuyong · hiliuyong

本帖最后由 hiliuyong 于 2020-11-26 23:40 编辑

非常感谢你的回复，解决了我第一问，第二问实际要把学生的信息全部展示出来，我改了下例子，希望你能明白我想要的

复制代码

KevinChen · KevinChen

您好，问题已收到，预计今晚给您回复，谢谢~

Richard.Ma · Richard.Ma

Student currentStudent = cmbStudents.Items.Cast<Student>().ToList()[cmbStudents.SelectedIndex] as Student;

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[已处理] 关于ComboBox关联的问题