Question

当用户单击基于姓氏或程序的搜索按钮时，我需要在列表框中列出结果。结果将从一个外部访问文件中读取（连接成功）。

我已经定义：

Name of List Box: lstResultListBox
Name of Text Box: LastNameProgramTextBox
Name of Search Button: SearchButton
Radio button 1: byLastNameRadioButton
Radio button 2: byProgramRadioButton
Clear Button: ClearButton

我没有在此处提供数据库表。

Form1.cs：

public partial class Form1 : Form
{
    public Form1()
    {

        InitializeComponent();
    }

    private void Form1_Load(object sender, EventArgs e)
    {
        // TODO: This line of code loads data into the 'StudentsDataSet.Student' table. You can move, or remove it, as needed.
        this.studentsTableAdapter.Fill(this.StudentsDataSet.Student);
    }

    private void Search_Click(object sender, EventArgs e)
    {
        var students =
        from s in this.StudentsDataSet.Student
        where s.LastName == LastNameProgramTextBox.Text
        where s.ProgramName == LastNameProgramTextBox.Text
        select s;
        foreach (var s in students)
        {
            lstResultListBox.Items.Add(s.LastName + ", " + s.FirstName);
        }
    }

    private void lstResultListBox_SelectedIndexChanged(object sender, EventArgs e)
    {
        LastNameProgramTextBox.Text = lstResultListBox.SelectedItem.ToString();
    }

我无法搜索或清除按钮！我尝试了Search_Click和SelectedIndexChanged，但无法弄清缺少的内容。这是我第一次在C＃Windows窗体中搜索。我已经正确定义了列表框，文本框，搜索按钮，清除按钮和单选按钮的名称。

ScreenShot of Form

c＃在列表框中列出搜索结果

0 个答案: