文本框数字,数值校验 public void DigitCheck_KeyPress(object sender, KeyPressEventArgs e) { e.Handled = !char.IsDigit(e.KeyChar) && !char.IsControl(e.KeyChar); } public void DecimalCheck_KeyPress(object sender, KeyPressEventArgs e) { if (!char.IsControl(e.Ke…

比如WInform中的文本框只能输入数字活着字母和退格键,e.kaychar(按下键盘的值)…

这是一个自定义控件,继承了TextBox,在TextBox基础上添加了4个属性(下载): 1.ControlType 文本框需要验证的类型 2.ControlTypeText 显示的文字(只读) 3.IsNULL 填写的内容是否可空 4.IsPass 格式是否正确(在文本框失去焦点时验证,只读) 代码如下: using System; using System.Collections.Generic; using System.Linq; using System.Text; using Sys…

private void textBox3_KeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e) { //阻止从键盘输入键 e.Handled = true; ') { e.Handled = false; } } 或者 private void tbID_KeyPress(object sender, KeyPressEventArgs e) { ') || e.KeyChar == ' '))//不输入输入除了数字…

输入框 <input name="title" type="text" oninput="onlyNum(this,'')" title="税额" autocomplete="off" placeholder="税额" class="layui-input"> js代码 /** * 只能输入数字含小数点 * @param e * @return */ fu…

private string Notes = "提示文本"; private void textBox1_Leave(object sender, EventArgs e) { // 退出失去焦点,重新显示 if (string.IsNullOrEmpty(textBox1.Text)) { textBox1.ForeColor = Color.DarkGray; this.textBox1.Text = Notes; } } private void textBox1_Enter(o…

|| e.KeyChar > ) && (e.KeyChar != ) && (e.KeyChar != ) && (e.KeyChar != )) { e.Handled = true; }…

delegate void SetTextCallback(string text); private void showClientMsg(string text) { // InvokeRequired required compares the thread ID of the // calling thread to the thread ID of the creating thread. // If these threads are different, it returns tr…

winfrom默认是不支持这种操作的,此时需要重写控件操作,具体代码如下: public class TextBoxEx : TextBox { public String PlaceHolderStr { get; set; } protected override void OnPaint(PaintEventArgs e) { // if (!String.IsNullOrEmpty(this.PlaceHolderStr)) { //坐标位置 0,0 需要根据对齐方式重新计算. e.Gr…

有3个常用方法 1.MouseMove事件中,使选不中 private void textBox3_MouseMove(object sender, MouseEventArgs e) { if (this.textBox3.SelectionLength > 0) { this.textBox3.SelectionStart = this.textBox1.TextLength; this.textBox3.SelectionLength = 0; } } 2. 新建一个类,取名为TextBo…