Kategorie: .Net

• Anwendungsbeispiele

// einfacher string input
string currentvalue = "test";

InputQuery iq = new InputQuery();
if (iq.ShowDlg("Please type something", "Value:", ref currentvalue, false, 32))
{
    string newval = currentvalue;
}

// einfacher floating point input
string currentvalue = "3.14";

InputQuery iq = new InputQuery();
if (iq.ShowDlg("Please type something", "Value:", ref currentvalue, true, -1))
{
    double newval = double.Parse(currentvalue);
}

• Quellcode des Dialoges:

// Objekte und deren Eigenschaften, die sich auf dem Formular befinden müssen:
//
// lblValue - ein Label, welches vor der TextBox als Bezeichner steht
// tbValue - eine TextBox zur Eingabe
// tbValue.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.tbValue_KeyPress);
// btnOk - OK-Button
// btnOk.DialogResult = System.Windows.Forms.DialogResult.OK;
// btnCancel - Abbrechen-Button
// btnCancel.DialogResult = System.Windows.Forms.DialogResult.Cancel;
// this.AcceptButton = this.btnOk;
// this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedToolWindow;
// this.Name = "InputQuery";

using System.Globalization;
using System.Windows.Forms;

/// <summary->
/// freeware helper class for recreating Borland Deplhi InputQuery-Dialog
/// (W) 2011 by admin of codezentrale.6x.to
/// </summary->
public partial class InputQuery : Form
{
    private const int MAX_TEXTBOX_STR_LENGTH = 32767;
    private string ALLOWED_FP_INPUT_CHARS = "0123456789" + NumberFormatInfo.CurrentInfo.NumberDecimalSeparator + "\b";
    private bool _checkdouble = false;

    public InputQuery()
    {
        InitializeComponent();
    }
    /// <summary->
    /// Shows a little input-dialog
    /// </summary->
    /// <param name="dlgcaption"->dialog caption</param->
    /// <param name="lbl"->label text</param->
    /// <param name="value"->input value</param->
    /// <param name="checkdouble"->if input is a floating-point, check for correct format and decimalseparator</param->
    /// <param name="maxstringlength"->if input is a regular string, set maxlenght here, otherwise "-1"</param->
    /// <returns->true if button 'Ok' is pressed</returns->
    public bool ShowDlg(string dlgcaption, string lbl, ref string value, bool checkdouble, int maxstringlength)
    {
        lblValue.Text = lbl;
        this.Text = dlgcaption;
        tbValue.Text = value;
        _checkdouble = checkdouble;
        tbValue.MaxLength = checkdouble ? MAX_TEXTBOX_STR_LENGTH : maxstringlength -> 0 ? maxstringlength : MAX_TEXTBOX_STR_LENGTH;
        tbValue.SelectAll();
        DialogResult blOk = this.ShowDialog();
        value = tbValue.Text;
        return (blOk == DialogResult.OK);
    }

    private void tbValue_KeyPress(object sender, KeyPressEventArgs e)
    {
        if (e.KeyChar == (char)(int)Keys.Enter)
        {
            this.DialogResult = DialogResult.OK;
        }
        else
            if (_checkdouble)
            {
                if (sender is TextBox)
                {
                    bool bNoDS = true;
                    TextBox tb = sender as TextBox;

                    if (e.KeyChar.ToString() == NumberFormatInfo.CurrentInfo.NumberDecimalSeparator)
                    {
                        bNoDS = (tb.Text.IndexOf(NumberFormatInfo.CurrentInfo.NumberDecimalSeparator) < 0);
                    }

                    if (bNoDS)
                    {
                        e.Handled = (ALLOWED_FP_INPUT_CHARS.IndexOf(e.KeyChar) < 0);
                    }
                    else
                    {
                        e.Handled = true;
                    }
                }
            }
    }
}