Question

以下是我的代码。我希望在两次不同的按钮点击时捕获两个时间戳之间的差异，即我希望在btnEndTime_click事件中使用btnStartTime_click事件的“startTime”。

    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

只需将startTime置于本地范围之外：

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);

}

Answer 2

由于这涉及到Web应用程序，因此必须以startTime的方式存储ViewState，以便稍后可以恢复它。

以下是使用private const string StartTimeViewstateKey = "StartTimeViewstateKey"; protected void btnStartTime_Click(object sender, EventArgs e) { var startTime = DateTime.Now; ViewState[StartTimeViewstateKey] = startTime.ToString(CultureInfo.InvariantCulture); } protected void btnEndTime_Click(object sender, EventArgs e) { var startTime = DateTime.Parse((string)ViewState[StartTimeViewstateKey], CultureInfo.InvariantCulture); var workDuration = DateTime.Now.Subtract(startTime).TotalMinutes; lblEndTime.Text = ("The Work duration is " + workDuration); }：

的快速示例

private const string StartTimeSessionKey= "StartTimeSessionKey";
protected void btnStartTime_Click(object sender, EventArgs e)
{
    var startTime = DateTime.Now;
    Session[StartTimeSessionKey] = startTime;
}
protected void btnEndTime_Click(object sender, EventArgs e)
{
    var startTime = (DateTime)Session[StartTimeSessionKey];

    var workDuration = DateTime.Now.Subtract(startTime).TotalMinutes;
    lblEndTime.Text = ("The Work duration is " + workDuration);
}

或者你可以使用会话状态：

{{1}}

将数据从一个按钮单击事件传递到另一个按钮单击事件

2 个答案: