Question

因此，我需要具有一个在文本框中键入数字（ID）的功能，并且当我单击按钮时，我需要它具有与输入的值相对应的显示值，该值将在不同的窗口中显示。 / p>

我需要将圈出的一个作为显示值，但我需要保留其值成员（即ID）

这是我在第一个窗口中的代码：

private void btnApprove_Click(object sender, EventArgs e)
    {
        PassingText = txtEvent.Text;
        PackingApproval pa = new PackingApproval();
        pa.Show();
    }

这是我在其他窗口中的代码：

private void PackingApproval_Load(object sender, EventArgs e)
    {
        txtBox4.Text = PackingList.PassingText;
    }

注意：我将显示给批准的值在数据库中具有相应的值

更新：我有一个用于从数据库中调用值的代码，但是由于它需要在两个窗口之间工作，所以我无法使其工作

        private void PackingApproval_Load(object sender, EventArgs e)
    {
        txtBox4.SelectedText = "EventID";

        SqlConnection con = new SqlConnection(@"Data Source=(local);Initial Catalog=Juan Carlo SCM;Persist Security Info=True;User ID=sa;Password=benilde");
        con.Open();
        SqlCommand sc = new SqlCommand("SELECT EventName FROM Event_Table WHERE EventID=@EventID", con);
        SqlDataReader reader;

        reader = sc.ExecuteReader();
        DataTable dt = new DataTable();
        dt.Columns.Add("EventID", typeof(string));
        dt.Columns.Add("EventName", typeof(string));
        dt.Load(reader);

        txtBox4.SelectedText = "EventID";
        txtBox4.Text = txtBox4.Tag.ToString();

        con.Close();
    }

Answer 1

您可以通过以下方式传递值：

通过构造函数

public partial class PackingApproval : Form
{
    public PackingApproval(string enterValue)
    {
        InitializeComponent();
        txtBox4.Text = enterValue;
    }
}

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }

    private void btnApprove_Click(object sender, EventArgs e)
    {
        var text = txtEvent.Text;
        PackingApproval pa = new PackingApproval(text);
        pa.Show();
    }
}

按目标对象的属性

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }

    private void btnApprove_Click(object sender, EventArgs e)
    {
        var text = txtEvent.Text;
        PackingApproval pa = new PackingApproval();
        pa.SetPackagingApprovalText = text;
        pa.Show();
    }
}

public partial class PackingApproval : Form
{
    private string _setPackagingApprovalText;
    public string SetPackagingApprovalText
    {
        get
        {
            return _setPackagingApprovalText;
        }
        set
        {
            txtBox4.Text = value;
            _setPackagingApprovalText = value;
        }
    }
    public PackingApproval()
    {
        InitializeComponent();
    }
}

通过目标对象+ FormLoad中的字段

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }

    private void btnApprove_Click(object sender, EventArgs e)
    {
        var text = txtEvent.Text;
        PackingApproval pa = new PackingApproval();
        pa.SetPackagingApprovalText = text;
        pa.Show();
    }
}
public partial class PackingApproval : Form
{
    public string SetPackagingApprovalText;
    public PackingApproval()
    {
        InitializeComponent();
    }

    private void PackingApproval_Load(object sender, EventArgs e)
    {
        txtBox4.Text = SetPackagingApprovalText;
    }
}

针对您的数据库问题：

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }

    private void btnApprove_Click(object sender, EventArgs e)
    {
        var text = txtEvent.Text;
        PackingApproval pa = new PackingApproval();
        pa.SetPackagingApprovalText = text;
        pa.Show();
    }
}

public partial class PackingApproval : Form
{
    public string SetPackagingApprovalText;
    public PackingApproval()
    {
        InitializeComponent();
    }

    private void PackingApproval_Load(object sender, EventArgs e)
    {
        SqlConnection con = new SqlConnection(@"Data Source=(local);Initial Catalog=Juan Carlo SCM;Persist Security Info=True;User ID=sa;Password=benilde");
        con.Open();
        SqlCommand sc = new SqlCommand("SELECT EventName FROM Event_Table WHERE EventID=@EventID", con);

        sc.Parameters.Add(new SqlParameter("EventID", int.Parse(SetPackagingApprovalText)));
        SqlDataReader reader;
        reader = sc.ExecuteReader();
        if (reader.HasRows)
        {
            reader.Read();
            txtBox4.Text = reader["EventName"].ToString();
        }

        reader.Close();
        con.Close();
    }
}

输入一个值，它将以另一种形式显示不同的值

1 个答案: