c# - 将数据从一个按钮单击事件传递到另一个按钮单击事件

Question

下面是我的代码。我想捕获两次不同按钮点击时两个时间戳之间的差异，即我希望 btnStartTime_click 事件的“startTime”用于 btnEndTime_click 事件。

    protected void btnStartTime_Click(object sender, EventArgs e)
    {
        var startTime = DateTime.Now;            
        lblStartTime.Text = startTime.ToString("HH:mm:ss tt");            
    }

    protected void btnEndTime_Click(object sender, EventArgs e)
    {            
        var workDuration = DateTime.Now.Subtract(startTime).TotalMinutes;
        lblEndTime.Text = ("The Work duration is "+workDuration);

    }

Answer 1

只需让您的 startTime 超出本地范围即可:

DateTime startTime;
protected void btnStartTime_Click(object sender, EventArgs e)
{
    startTime = DateTime.Now;            
    lblStartTime.Text = startTime.ToString("HH:mm:ss tt");            
}

protected void btnEndTime_Click(object sender, EventArgs e)
{            
    var workDuration = DateTime.Now.Subtract(startTime).TotalMinutes;
    lblEndTime.Text = ("The Work duration is "+workDuration);

}