如何在回发中保持运行总计？ [英] How to keep a running total on postback?

问题描述

我有一个文本框，用户可以在其中输入分数。单击按钮时，将在列表框中输入该分数，并清除文本框。



问题是我想保持一个总计。例如，如果输入3，则总数应为3，接下来输入7时，总数应为10.



我尝试过：

I have a a textbox where the user would enter a score. When a button is click that score would be entered in a listbox and the textbox would be cleared.

The problem is that I want to keep a running total. For example if 3 is entered then total should be 3, next when 7 is entered total should be 10.

What I have tried:

int total;
            ViewState["total"] = 0; 
            int num = Convert.ToInt32(txtScore.Text);
            total = total + num;
            Label1.Text = total.ToString();

推荐答案

你可以通过一系列不同的方式来做，比如上面的隐藏字段。要使用ViewState执行此操作，我会执行以下操作。

You can do it a bunch of different ways, such as hidden fields above. To do it using ViewState I would do the following.

int total;
int num = Convert.ToInt32(txtScore.Text);
if (ViewState["total"] == null)
{
	total = 0;
}
else
{
	total = (int)ViewState["total"] + num;
}
ViewState["total"] = total;
Label1.Text = total.ToString();

使用隐藏字段 [ ^ ]

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