如何存储记录使用的ViewState [英] How to store record using ViewState

问题描述

现在有2个按钮，让我们分别称之为Button1的和的Button2。
如果我点击Button1的商店1的ViewState [记录];同样，如果我点击Button2的
店2的ViewState [记录]等。

Now there are 2 buttons, let's call them "Button1" and "Button2" respectively. If I click "Button1", store "1" in ViewState["Record"]; also, if I click "Button2", store "2" in ViewState["Record"], etc.

当我点击Button1⟶Button1⟶Button2⟶Button2，我预期的结果是：在ViewState中[记录]，还有一个记录列表，像

When I click Button1⟶Button1⟶Button2⟶Button2, my expected result is: in ViewState["Record"], there are a list of records, like

[1,1,2,2].

下面是我的单击事件code：

Here is my click event code:

protected void Button1_Click(object sender, EventArgs e)
{
  ViewState.Add("Record", "1");
}
protected void Button2_Click(object sender, EventArgs e)
{
  ViewState.Add("Record", "2");
}
//show the viewstate result
protected void ShowResult(object sender, EventArgs e)
{
 for (int i = 1; i <= 4; i++)
    {
       Label.Text += ViewState["Record"];
    }
}

显示2222，而不是1122。
我怎样才能code如何解决？

It shows "2222" instead of "1122". How can I code to resolve it?

推荐答案

当您添加值实际上它并不增加录音键，只是把一个值录音键。你总是看到你的循环最后的附加价值。

When you add Record key a value actually it not adds, just puts a value Record key. You always see last added value on your loop.

您应该添加一个列表来ViewState的并增加其价值上市。

You should add a List to ViewState and add value to list.

添加此属性。

protected  List<long> ViewStateList
{
  get{ if(ViewState["Record"] == null) ViewState["Record"] = new  List<long>(); 
       return (List<long>)ViewState["Record"]  }
}

和使用像

protected void Button1_Click(object sender, EventArgs e)
{
  ViewStateList.Add(1);
}

循环

protected void ShowResult(object sender, EventArgs e)
{
 foreach(long item in ViewStateList)
    {
       Label.Text += item.ToString();
    }
}

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