Question

我的asp网页上有这个代码（这是一个ID为www.example.com/GestHC.aspx?pID=36006394的网址）

public partial class GestHC : WebPart
{
    public GestHC ()
    {
    }
    static int iIDHC;

    protected override void OnInit(EventArgs e)
    {
        base.OnInit(e);
        InitializeControl();
    }

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!this.Page.IsPostBack)
        {

            iIDHC = -1;
            string str = this.Page.Request["pID"];  
            iIDHC = int.Parse(str.Replace("'", ""));

            MyModel hc = MyModel.readdata(iIDHC);

            this.txtName.text = hc.name
            this.txtSurname.text = hc.surname 
            ...

        }
    }

    protected void btnSave_Click(object sender, EventArgs e)
    {
        try
        {
            MyModel hc = new MyModel();
            if (iIDHC != -1)
            {
                hc = MyModel.readdata(iIDHC);                
            }
            else
            {
                hc.name = txtname.text;
                hc.surname = txtSurname.text;

            }

            hc.dir1 = dir.text;
            ...

            hc.savedata()
        }
         catch (Exception)
         {
             this.navegarAGridMensaje("Error");
         }
    }    
}

问题在于，当用户加载数据并保存数据时，一切正常，但当超过2个用户或浏览器一起工作时，数据会混合在一起。例如：

User a creates:
 ID = 10
 Name = XXX
 Age = 8

User b creates:
 ID = 11
 Name = YYY
 Age = 10

然后，如果用户a更新了他的数据（ID = 10），可能将Age设置为80，结果是

User a creates:
 ID = 10
 Name = XXX
 Age = 8

User b creates:
 ID = 11
 Name = YYY
 Age = 88

所以（ID = 11）更新了。 Debuggin ..我可以看到使用静态id，当第二个用户加载它时可以读取以前的用户iIDHC ....

如何避免这个问题？

Answer 1

您可以改为使用Session对象（https://msdn.microsoft.com/en-us/library/ms178581.aspx）。

当您将数据存储在静态变量中时 - 它将在您应用中的所有用户之间共享。

Answer 2

Make it non static!

public partial class GestHC : WebPart
{
    public GestHC ()
    {
    }
    private int iIDHC = -1;//initialize here
...
}

also you dont have to initialize in page load

protected void Page_Load(object sender, EventArgs e)
{
    //iIDHC = -1; -  not required as you can initialize it during declaration
}

静态变量获取参数

2 个答案: