Question

C# 中,文本框的默认值是为0, 当用户将0删掉后,此时文本框的值是为空, 怎样使鼠标移开后,文本框的值变回0?

Answer 1

private void Form1_Load(object sender, EventArgs e)
{
this.textBox1.LostFocus += new EventHandler(textBox1_LostFocus);
}

void textBox1_LostFocus(object sender, EventArgs e)
{
if (textBox1.Text == "")
{
textBox1.Text = "0";
}
}

Answer 2

用js写
onmouseout="if(this.value=='')this.value=0;"
onmouseover="if(this.value=='0')this.value=;"

Answer 3

C# 中,文本框的默认值是为0, 当用户将0删掉后,此时文本框的值是为空, 怎样使鼠标移开后,文本框的值变回0?
研琴侦狭座破蚂动衔斥

Answer 4

路过滴