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Winform自定义控件-新建一个带水印的输入框(WatermarkTextBox)

想溜了的蜗牛 2022-04-27 阅读 38
c#winform

Winform自定义控件-新建一个带水印的输入框(WatermarkTextBox)

public partial class WatermarkTextBox : TextBox
    {
        public WatermarkTextBox()
        {
            InitializeComponent();
        }
        private const uint ECM_FIRST = 0x1500;
        private const uint EM_SETCUEBANNER = ECM_FIRST + 1;

        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = false)]
        static extern IntPtr SendMessage(IntPtr hWnd, uint Msg, uint wParam, [MarshalAs(UnmanagedType.LPWStr)] string lParam);

        private string watermarkText;
        public string WatermarkText
        {
            get { return watermarkText; }
            set
            {
                watermarkText = value;
                SetWatermark(watermarkText);
            }
        }

        private void SetWatermark(string watermarkText)
        {
            SendMessage(this.Handle, EM_SETCUEBANNER, 0, watermarkText);
        }
        protected override void OnPaint(PaintEventArgs pe)
        {
            base.OnPaint(pe);
        }
    }
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