变量怎么样保持啊

[lshfong]

string userid = "";
protected void Page_Load(object sender, EventArgs e)
{

userid = "10";//这里已给了值

}
protected void Button1_Click(object sender, EventArgs e)
{
userid//这里的值怎么又回到空了呢?

}

[fuda_1985]

string userid = "";
protected void Page_Load(object sender, EventArgs e)
{
if(!ispostback)
{
userid = "10";//这里已给了值
}

}
protected void Button1_Click(object sender, EventArgs e)
{
userid//这里的值怎么又回到空了呢?

}

[fuda_1985]

去看看asp.net页面加载顺序对你有帮助。

[koukoujiayi]

放到ViewState里!
如:
ViewState["myuserid"]=10";

取出的时候:
string userid=ViewState["myuserid"].ToString();

[真相重于对错]

b/s是无状态的，放到viewstatesl里面
ViewState["userid"] = "10";//这里已给了值
取值
string str = ViewState["userid"].ToString()

[viphz615]

用静态 static修饰 看看

[huiming_zhou]

[Quote=引用 1 楼 fuda_1985 的回复:]

string userid = "";
protected void Page_Load(object sender, EventArgs e)
{
if(!ispostback)
{
userid = "10";//这里已给了值
}

}
protected void Button1_Click(object sender, EventArgs e)
{……
[/Quote]

正解。。。。要在if(!ispostback)里面赋值！！