如何在 c# 的日期時間選擇器中添加秒數？

Question

我希望當您按下按鈕時，它會為日期計時器選擇器增加 30 秒。 但發生在我身上的是它們沒有加起來。

這是我的代碼：

public partial class Form1 : Form
{
    double seg;

    public void Form1_Load(object sender, EventArgs e)
    {
        this.dateTimePicker1.Value = this.dateTimePicker1.Value.AddSeconds(seg);    
    }
    private void s30_Click(object sender, EventArgs e)
    {
        seg = 30;
    }
}

Answer 1

在點擊事件中更新控件的值：

private void s30_Click(object sender, EventArgs e)
{
    seg = 30;
    this.dateTimePicker1.Value = this.dateTimePicker1.Value.AddSeconds(seg);
}

Form_Load事件僅在首次加載表單時發生。 (Note that this is specific to Windows Forms. In Web Forms you'll need to take this a step further and persist the value somewhere, because every post-back would load a new instance of the form and the value would start over.)

當然，由於seg除了它的硬編碼值之外什么都不會改變，所以你並不真的需要它。 只需將秒數增加該硬編碼值即可：

private void s30_Click(object sender, EventArgs e)
{
    this.dateTimePicker1.Value = this.dateTimePicker1.Value.AddSeconds(30);
}

然后，您可以完全從代碼中刪除seg變量。