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  • Some useful TextBox Validations

    Numeric TextBox
    private void textBox1_KeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e)
    {
    if ( !( char.IsDigit( e.KeyChar ) || char.IsControl( e.KeyChar ) ) )
    {
    e.Handled = true;
    }
    }
    

    Numeric TextBox with Decimals
    private void textBox1_KeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e)
    {
    if ( !( char.IsDigit( e.KeyChar) || char.IsControl( e.KeyChar ) ||(e.KeyChar== (char )46)) )
    {
    e.Handled = true;
    }
    }
    

    TextBox Allowing Characters Only
    private void textBox1_KeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e)
    {
    if ( !( char.IsLetter( e.KeyChar ) || char.IsControl( e.KeyChar ) ) )
    {
    e.Handled = true;
    }
    }
    

    TextBox Allowing Upper Case Characters Only
    private void textBox1_KeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e)
    {
    if ( !( char.IsUpper( e.KeyChar ) || char.IsControl( e.KeyChar )) )
    {
    e.Handled = true;
    }
    }
    

    TextBox Allowing Lower Case Characters Only
    private void textBox1_KeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e)
    {
    if ( !( char.IsLower( e.KeyChar ) || char.IsControl( e.KeyChar )) )
    {
    e.Handled = true;
    }
    }
    

    Check For Unfilled TextBox
    // Call this function and pass the Textbox as parameter to this function
    public static bool ChkEmpty(params System.Windows.Forms.TextBox[ ] tb)
    {
    int i;
    for (i = 0; i < tb.Length; i++)
    {
    if (tb[i].Text.Trim() == "")
    {
    MessageBox.Show("Don't keep field empty");
    tb[i].Focus();
    return false;
    }
    }
    return true;
    }


    http://www.codeproject.com/useritems/tips.asp#tip3.4.3
     
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  • 原文地址:https://www.cnblogs.com/ipqn/p/381776.html
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