Question

我需要C＃中的功能，例如滚动图像。

图像应从数据库调用，然后单击下一步。应显示接下来的4张图像。我试过它：

Frame f = new Frame (str); //Use this to open the JFrame
f.setVisible(true);

class Frame extends JFrame {

    private String str;

    public Frame (String str) {
        this.str = str;
        this.add(new JLabel(str, JLabel.CENTER));
    }

    public String getString() {
        return this.str;
    }
}

但是当调用这些功能时，初始值将出现在第一个。

如何覆盖初始值？

Answer 1

这是一个可以帮助您入门的代码段。

int j = 1, k = 4;
protected void Page_Load(object sender, EventArgs e)
{
    //check if the viewstate exists, if not store default value of j
    if (ViewState["recomended"] == null)
    {
        ViewState["recomended"] = j;
    }
    else
    {
        //convert the viewstate back to an int
        j = Convert.ToInt32(ViewState["recomended"]);

        //pretty obvious what this does...
        k = j + 3;
    }
}

private void recomended()
{
    //save the new value of j in the viewstate
    ViewState["recomended"] = j;

    //visualize the result
    Label1.Text = j + " " + k;
}

protected void btnleft_Click(object sender, EventArgs e)
{
    j = j - 4;
    k = k - 4;
    recomended();
}

protected void btnright_Click(object sender, EventArgs e)
{
    j = j + 4;
    k = k + 4;
    recomended();
}

如何在执行方法和页面重新加载时覆盖C＃中的初始化值

1 个答案: