先看下效果图,初次进来是界面左边的效果,点击请输入账号,清除内容,可以直接输入,右边图
以下代码是失去焦点的,一定要把控件的属性TabStop 改为false。不然是不行的。
#region 失去焦点 protected override bool ProcessTabKey(bool forward) { foreach (Control c in this.Controls) { if (c is TextBox) { c.TabStop = true; } } return base.ProcessTabKey(forward); } #endregion
水印类
把水印类添加在项目中。直接调用方法即可ComLogin_Load
////// 基于.NET 2.0的TextBox工具类 /// public static class TextBoxToolV2 { private const int EM_SETCUEBANNER = 0x1501; [DllImport("user32.dll", CharSet = CharSet.Auto)] private static extern Int32 SendMessage (IntPtr hWnd, int msg, int wParam, [MarshalAs(UnmanagedType.LPWStr)] string lParam); ////// 为TextBox设置水印文字 /// /// TextBox /// 水印文字 public static void SetWatermark(this TextBox textBox, string watermark) { SendMessage(textBox.Handle, EM_SETCUEBANNER, 0, watermark); } ////// 清除水印文字 /// /// TextBox public static void ClearWatermark(this TextBox textBox) { SendMessage(textBox.Handle, EM_SETCUEBANNER, 0, string.Empty); } }
private void ComLogin_Load(object sender, EventArgs e) { this.WindowState = FormWindowState.Maximized; TextBoxToolV2.SetWatermark(txtUserID, "请输入账号"); TextBoxToolV2.SetWatermark(txtEntryPwd, "请输入密码"); }